1. Manuals
  2. Brands
  3. Micom Manuals
  4. Protection Device
  5. P723
  6. Technical manual

Micom P723 Technical Manual

High impedance differential protection
Hide thumbs
Table of Contents

Advertisement

Quick Links

MiCOM P721 & P723
High Impedance Differential Protection
P72x/EN T/C21
Software Version 11.D
Technical Guide

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the P723 and is the answer not in the manual?

Questions and answers

Related Manuals for Micom P723

Summary of Contents for Micom P723

  • Page 1 MiCOM P721 & P723 High Impedance Differential Protection P72x/EN T/C21 Software Version 11.D Technical Guide...
  • Page 3 Technical Guide P72x/EN T/C21 Contents MiCOM P721/723 Page 1/2 MiCOM P721 & P723 HIGH IMPEDANCE DIFFERENTIAL PROTECTION TECHNICAL GUIDE CONTENTS Safety Section Pxxxx/EN SS/G11 Introduction P72x/EN IT/C21 Handling, Installation and Case Dimensions P72x/EN IN/C21 User Guide P72x/EN FT/C21 Menu Content Tables...
  • Page 4 P72x/EN T/C21 Technical Guide Contents Page 2/2 MiCOM P721/P723 BLANK PAGE...
  • Page 5 Pxxx/EN SS/G11 SAFETY SECTION...

  • Page 7: Table Of Contents

    Pxxx/EN SS/G11 Safety Section Page 1/8 STANDARD SAFETY STATEMENTS AND EXTERNAL LABEL INFORMATION FOR SCHNEIDER ELECTRIC EQUIPMENT INTRODUCTION HEALTH AND SAFETY SYMBOLS AND EXTERNAL LABELS ON THE EQUIPMENT Symbols Labels INSTALLING, COMMISSIONING AND SERVICING DECOMMISSIONING AND DISPOSAL TECHNICAL SPECIFICATIONS FOR SAFETY Protective fuse rating Protective Class Installation Category...
  • Page 8 Pxxx/EN SS/G11 Page 2/8 Safety Section BLANK PAGE...

  • Page 9: Equipment

    Pxxx/EN SS/G11 Safety Section Page 3/8 INTRODUCTION This guide and the relevant equipment documentation provide full information on safe handling, commissioning and testing of this equipment. This Safety Guide also includes descriptions of equipment label markings. Documentation for equipment ordered from Schneider Electric is despatched separately from manufactured goods and may not be received at the same time.

  • Page 10: Symbols And External Labels On The Equipment

    Pxxx/EN SS/G11 Page 4/8 Safety Section SYMBOLS AND EXTERNAL LABELS ON THE EQUIPMENT For safety reasons the following symbols and external labels, which may be used on the equipment or referred to in the equipment documentation, should be understood before the equipment is installed or commissioned.
  • Page 11 Pxxx/EN SS/G11 Safety Section Page 5/8 To ensure that wires are correctly terminated the correct crimp terminal and tool for the wire size should be used. The equipment must be connected in accordance with the appropriate connection diagram. Protection Class I Equipment Before energizing the equipment it must be earthed using the protective conductor terminal, if provided, or the appropriate termination of the supply plug in the case of plug connected equipment.
  • Page 12 Pxxx/EN SS/G11 Page 6/8 Safety Section UL and CSA/CUL Listed or Recognized equipment To maintain UL and CSA/CUL Listing/Recognized status for North America the equipment should be installed using UL or CSA Listed or Recognized parts for the following items: connection cables, protective fuses/fuseholders or circuit breakers, insulation crimp terminals and replacement internal battery, as specified in the equipment documentation.

  • Page 13: Decommissioning And Disposal

    *CT shorting links must be in place before the insertion or removal of MMLB test plugs, to avoid potentially lethal voltages. *Note: When a MiCOM P992 Test Plug is inserted into the MiCOM P991 Test Block, the secondaries of the line CTs are automatically shorted, making them safe.

  • Page 14: Technical Specifications For Safety

    Pxxx/EN SS/G11 Page 8/8 Safety Section TECHNICAL SPECIFICATIONS FOR SAFETY Unless otherwise stated in the equipment technical manual, the following data is applicable. Protective fuse rating The recommended maximum rating of the external protective fuse for equipments is 16A, high rupture capacity (HRC) Red Spot type NIT, or TIA, or equivalent. Unless otherwise stated in equipment technical manual, the following data is applicable.
  • Page 15 Introduction P72x/EN IT/C21 MiCOM P721/P723 INTRODUCTION...
  • Page 17 Introduction P72x/EN IT/C21 MiCOM P721/P723 Page 1/10 CONTENTS INTRODUCTION HOW TO USE THIS MANUAL INTRODUCTION TO THE MiCOM RANGE INTRODUCTION TO THE MiCOM P721 & P723 PROTECTIONS MAIN FUNCTIONS Main functions General functions Ordering options...
  • Page 18 P72x/EN IT/C21 Introduction Page 2/10 MiCOM P721/P723 BLANK PAGE...
  • Page 19 MiCOM P721/P723 Page 3/10 INTRODUCTION The differential protections of the MiCOM P72x range are Schneider Electric numerical high impedance differential protection. MiCOM P721 and P723 have been designed to provide differential protection and a high impedance differential protection The differential protection consists to measure the summation of n Current Transformers (CTs) secondary currents.
  • Page 20 MiCOM P721/P723 HOW TO USE THIS MANUAL This manual provides a description of MiCOM P721 and P723 functions and settings. The goal of this manual is to allow the user to become familiar with the application, installation, setting and commissioning of these relays.
  • Page 21 MiCOM P721/P723 Page 5/10 INTRODUCTION TO THE MiCOM RANGE MiCOM is a comprehensive solution capable of meeting all electricity supply requirements. It comprises of a range of components, systems and services from Schneider Electric. Flexibility is central to the MiCOM concept.
  • Page 22 MiCOM P721/P723 INTRODUCTION TO THE MiCOM P721 & P723 PROTECTIONS The range of MiCOM protection relays is built on the success of the MIDOS, K and MODN ranges by incorporating the last changes in digital technology. Relays from the MiCOM P72x range are fully compatible and use the same modular box concept.
  • Page 23 Introduction P72x/EN IT/C21 MiCOM P721/P723 Page 7/10 MAIN FUNCTIONS Main functions The following table shows the functions available for the different models of the MiCOM P72x range of relays. ANSI FEATURES P721 P723 CODES Phase segregated high impedance current differential •...
  • Page 24 P72x/EN IT/C21 Introduction Page 8/10 MiCOM P721/P723 Application overview FIGURE 1: FUNCTIONAL DIAGRAM...
  • Page 25 Introduction P72x/EN IT/C21 MiCOM P721/P723 Page 9/10 Ordering options Information Required with Order Relay Type (differential protection) Variant Simple phase high impedance differential protection Simple phase or three phase high impedance protection with binary I/O extension Auxiliary and digital input voltage...
  • Page 26 P72x/EN IT/C21 Introduction Page 10/10 MiCOM P721/P723 BLANK PAGE...
  • Page 27 Handling, Installation and Case Dimensions P72x/EN IN/C21 MiCOM P721/P723 HANDLING, INSTALLATION AND CASE DIMENSIONS...
  • Page 29 Handling, Installation and Case Dimensions P72x/EN IN/C21 MiCOM P721/P723 Page 1/10 CONTENTS GENERAL CONSIDERATIONS Receipt of relays Electrostatic discharge (ESD) HANDLING OF ELECTRONIC EQUIPMENT RELAY MOUNTING UNPACKING STORAGE DIMENSIONS Connection of power terminals, and Signals terminals Communication port RS485 Earthing...
  • Page 30 P72x/EN IN/C21 Handling, Installation and Case Dimensions Page 2/10 MiCOM P721/P723 BLANK PAGE...
  • Page 31 Handling, Installation and Case Dimensions P72x/EN IN/C21 MiCOM P721/P723 Page 3/10 GENERAL CONSIDERATIONS BEFORE CARRYING OUT ANY WORK ON THE EQUIPMENT, THE USER SHOULD BE FAMILIAR WITH THE CONTENTS OF THE SAFETY GUIDE SFTY/4LM/E11 OR LATER ISSUE, OR THE SAFETY AND TECHNICAL DATA SECTIONS OF THE TECHNICAL MANUAL AND ALSO THE RATINGS ON THE EQUIPMENT RATING LABEL.
  • Page 32 P72x/EN IN/C21 Handling, Installation and Case Dimensions Page 4/10 MiCOM P721/P723 HANDLING OF ELECTRONIC EQUIPMENT A person’s normal movements can easily generate electrostatic potentials of several thousand volts. Discharge of these voltages into semiconductor devices when handling electronic circuits can cause serious damage, which often may not be immediately apparent but the reliability of the circuit will have been reduced.
  • Page 33 Handling, Installation and Case Dimensions P72x/EN IN/C21 MiCOM P721/P723 Page 5/10 RELAY MOUNTING Relays are dispatched either individually or as part of a panel/rack assembly. If an MMLG test block is to be included it should be positioned at the right-hand side of the assembly (viewed from the front).
  • Page 34 P72x/EN IN/C21 Handling, Installation and Case Dimensions Page 6/10 MiCOM P721/P723 UNPACKING Care must be taken when unpacking and installing the relays so that none of the parts is damaged or the settings altered. Relays must only be handled by skilled personnel. The installation should be clean, dry and reasonably free from dust and excessive vibration.
  • Page 35 Handling, Installation and Case Dimensions P72x/EN IN/C21 MiCOM P721/P723 Page 7/10 STORAGE If relays are not to be installed immediately upon receipt they should be stored in a place free from dust and moisture in their original cartons. Where de-humidifier bags have been included in the packing they should be retained.
  • Page 36 P72x/EN IN/C21 Handling, Installation and Case Dimensions Page 8/10 MiCOM P721/P723 DIMENSIONS Connection of power terminals, and Signals terminals The individual equipment are delivered with sufficient M4 screws to connect the relay via annular terminals, with a maximum recommended of two annular terminals per contact.
  • Page 37 Handling, Installation and Case Dimensions P72x/EN IN/C21 MiCOM P721/P723 Page 9/10 To insure the insulation of the terminals and to respect the security and safety instructions, an isolated sleeve can be used. We recommend the following cable cross-sections: − Auxiliary sources Vaux: 1.5 mm²...
  • Page 38 P72x/EN IN/C21 Handling, Installation and Case Dimensions Page 10/10 MiCOM P721/P723 CASE DIMENSIONS MiCOM P721 and P723 relays are available in a 4U metal case for panel or flush mounting. Weight: 1.7 to 2.1 Kg External size: Height case 152 mm...
  • Page 39 User Guide P72x/EN FT/C21 MiCOM P721/P723 USER GUIDE...
  • Page 41 User Guide P72x/EN FT/C21 MiCOM P721/P723 Page 1/38 CONTENTS PRESENTATION OF MiCOM P721 AND P723 PROTECTIONS USER INTERFACE 1.1.1 Relay Overview 1.1.2 Front panel description 1.1.3 LCD display and keypad description 1.1.4 LEDs 1.1.5 Description of the two areas under the top and bottom flaps 1.1.6...
  • Page 42 P72x/EN FT/C21 User Guide Page 2/38 MiCOM P721/P723 2.8.5 Latch of the auxiliary output relays (RL2 to RL8) 2.8.6 Inputs submenu 2.8.7 CIRCUIT BREAKER FAILURE submenu 2.8.8 Submenu Logic Equations RECORDS Menu 2.9.1 Fault Record submenu 2.9.2 INSTANTANEOUS RECORDS submenu 2.9.3...
  • Page 43 Regarding current inputs, MiCOM P721 has one earth current input available for 1A and 5A rated CTs. MiCOM P723 has 3 phase and 1 earth current inputs available for 1 and 5 Amps rated CTs. On each one of these relays, it is possible to combine 1 and 5 Amp current inputs together (i- e a mix between 1A for earth fault and 5A for phase connections).
  • Page 44 P72x/EN FT/C21 User Guide Page 4/38 MiCOM P721/P723 USER INTERFACE 1.1.1 Relay Overview The next figures show the P721 and P723 protections. The table shows the case size. Height Depth Width 4U (177mm) 226mm 20 TE The hinged covers at the top and bottom of the relay are shown closed. Extra physical protection for the front panel can be provided by an optional transparent front cover;...
  • Page 45 MiCOM P721/P723 Page 5/38 1.1.2 Front panel description MiCOM P721 and P723 relay front panel allows the user to easily enter relay settings, display measured values and alarms and to clearly display the status of the relay. Top cover Top cover...
  • Page 46 1.1.3 LCD display and keypad description The front panel components are shown below. The front panel functionality is identical for the P721 and P723 relays. 1.1.3.1 LCD display In the front panel, a liquid crystal display (LCD) displays settings, measured values and alarms.
  • Page 47 LEDs The LED labels on the front panel are by default written in English, however the user has self-adhesive labels available with MiCOM relays on which it is possible to write using a ball point pen. The top four LEDs indicate the status of the relay (Trip condition, alarm LED, equipment failure, auxiliary supply).
  • Page 48 1.1.5.2 Lower flap Under the lower flap, a RS232 port is available in all MiCOM relays. It can be used either to download a new version of the application software version into the relay flash memory or to download/retrieve settings plugging a laptop loaded with MiCOM S1 setting software.
  • Page 49 User Guide P72x/EN FT/C21 MiCOM P721/P723 Page 9/38 Menu structure The relay’s menu is arranged in a tabular structure. Each setting in the menu is referred to as a cell, and each cell in the menu may be accessed by reference to a row and column address.
  • Page 50 P72x/EN FT/C21 User Guide Page 10/38 MiCOM P721/P723 1.3.3 Changing the password To change an active password, go to the OP. PARAMETERS menu and then to the Password submenu. Enter the current password and validate it. Then press and enter the...
  • Page 51 The relay is in maintenance mode. Relay Hardware or Software Warning Messages Any software or hardware fault internal to MiCOM relay generates a "hardware/software alarm" that is stored in memory as a "Hardware Alarm". If several hardware alarms are detected they are all stored in their order of appearance. The warning messages are presented on the LCD in reverse order of their detection (the most recent first and the oldest last).
  • Page 52 "SETTING ERROR" alarm is still displayed, please contact Schneider Electric Customer Care Services for advice and assistance. Minor fault: The MiCOM relay is fully operational. The RL0 watchdog relay is energised (35-36 contact open, 36-37 contact closed). << COMM.ERROR >>: Communication failure <<...
  • Page 53 Using MiCOM S1 Studio, the menu is displayed with a tree structure. A click on the “+” sign (or a double click on the menu title) opens the corresponding submenu. The second column displays the corresponding value for each parameter.
  • Page 54 Status 01011101 Logic Outputs are numbered from 1 to 8 for P723 and 1 to 4 for P721. When The state of each output is: - state 0: it means that the output relay is activated, - state 1: it means that the output relay is not activated.
  • Page 55 User Guide P72x/EN FT/C21 MiCOM P721/P723 Page 15/38 Displays the product code. Product code P723xxxxxxxxx Displays the serial number Serial number XXXXXXXX CONFIGURATION menu Under this menu, the different submenus are: CONFIGUR- ATION Connection led 5 Led 6 Led 7...
  • Page 56 (the LED lights up when the protection function is active). The following table lists the protection functions that can be assigned to the LEDs (5 to 8) for each model of relay. Function P721 P723 Information [87] Diff Phase differential protection threshold [87N] Diff...
  • Page 57 User Guide P72x/EN FT/C21 MiCOM P721/P723 Page 17/38 Function P721 P723 Information [95A] tSupA Time delayed phase A (or L1, or R) high impedance differential threshold (buswire supervision) [95B] tSupB As above for phase B (or L2 or S) [95C] tSupC As above for phase C (or L3 or T) Copy of the status of the Logic Input n°1...
  • Page 58 P72x/EN FT/C21 User Guide Page 18/38 MiCOM P721/P723 P72x Front panel setting: Press to access the LED 5 CONFIGURATION submenu, then twice (press to access to others LEDs CONFIGURATION submenus). Select “Yes” to assignate a LED to a function. CONFIGURATION Heading LED 5 submenu.
  • Page 59 Choose if you want to activate the MAINTENANCE Maintenance Mode MODE of the relay. If Yes is selected, output relays are disconnected from the protection and automation functions. P721 (4 relays + watchdog) and P723 (8 relays + Relays CMD 8765W4321 watchdog). 000000000...
  • Page 60 P72x/EN FT/C21 User Guide Page 20/38 MiCOM P721/P723 MEASUREMENTS Menu Under the MEASUREMENTS menu, the user can read the various measurement values. To access the MEASUREMENTS menu from the default display, press then 2 times. Heading of the MEASUREMENTS menu.
  • Page 61 User Guide P72x/EN FT/C21 MiCOM P721/P723 Page 21/38 COMMUNICATION Menu The COMMUNICATION menu content depends on the communication protocol of the relay. Three protocols are available: MODBUS, IEC 60870-5-103 and DNP3.0. To access the MEASUREMENTS menu from the default display, press...
  • Page 62 P72x/EN FT/C21 User Guide Page 22/38 MiCOM P721/P723 IEC 60870-5-103 communication only Measure Enabling Selects the measures transmission filtering mode. Asdu 3.4&9 ASDU 3.4 option allows communication of earth current measures (IN) to the master station. ASDU 9 option allows communication to the master...
  • Page 63 User Guide P72x/EN FT/C21 MiCOM P721/P723 Page 23/38 PROTECTION G1 The fault timer tDiff sets the time delayed earth [87N] Flt Timer differential protection threshold. The setting range is t Diff from 0s to 2s (step 10ms). The Reset timer menu sets the reset time, from 0 to...
  • Page 64 P72x/EN FT/C21 User Guide Page 24/38 MiCOM P721/P723 2.7.2 Phase protection configuration 2.7.2.1 Submenu [87] Phase differential protection (P723 only) PROTECTION G1 Heading of the phase differential current protection [87] Phase diff protection submenu (“[87] Phase diff protection”). Setting choice: Yes or No...
  • Page 65 Sample detection. Setting choice: sample, fast sample or Fourier mode. AUTOMAT. CTRL Menu Under the AUTOMAT. CTRL Menu, the user can program the different automation functions available in the MiCOM P721 and P723. The different submenus are: AUTOMAT. CTRL Trip...
  • Page 66 P72x/EN FT/C21 User Guide Page 26/38 MiCOM P721/P723 Function P721 P723 INFORMATION and COMMENTS Trip Equ G Logical output of Boolean Equation G. Trip Equ H Logical output of Boolean Equation H. Heading of the AUTOMAT.CTRL AUTOMAT. CTRL Heading of the Trip ORDER sub-menu.
  • Page 67 Through the Blocking Logic submenu, the user can block each delayed threshold using a " Start Block Logic 1 or 2" input (refer to Inputs menu). MiCOM P72x relays have the submenu Blocking Logic 1 and Blocking Logic 2 available for setting.
  • Page 68 P72x/EN FT/C21 User Guide Page 28/38 MiCOM P721/P723 The following protection functions can be assigned to output relays using this submenu. Function P721 P723 INFORMATION and COMMENTS [87N] Diff Earth differential protection threshold [87N] tDiff Time delayed earth differential protection threshold...
  • Page 69 3 (RL3) 1100010 Setting choice: 1 assigns the output relay; 0 no assignement Submenu for P721. Function 2.8.5 Latch of the auxiliary output relays (RL2 to RL8) With the following menu the user can set each output relay as latched or not latched.
  • Page 70 P72x/EN FT/C21 User Guide Page 30/38 MiCOM P721/P723 Label P721 P723 Function Start Block Blocking logic 1 Logic 1 Start Block Blocking logic 2 Logic 2 Change Change of setting group (default setting group setting Reset Leds Reset of the "Trip" & "Alarm" leds Maint.
  • Page 71 NOT, AND and OR operators (indicated from highest to lowest priority). Up to 16 operands can be used in any single equation. The following logic signals are available for mapping to an equation: Function P721 P723 Information Null the condition is null (low level) Not Null...
  • Page 72 P72x/EN FT/C21 User Guide Page 32/38 MiCOM P721/P723 Function P721 P723 Information [95C] tSupC As above for phase C (or L3 or T) Buswire Short Buswires short-circuited Copy of the status of the Logic Input tAux 1 tAux 1 tAux 2...
  • Page 73 User Guide P72x/EN FT/C21 MiCOM P721/P723 Page 33/38 In order to modify an “Equation A.xx” menu: − Press key to access to the menu (if necessary, enter password). Equation A.00 Boolean Logic press key to access to Boolean operator or Logic signal...
  • Page 74 P72x/EN FT/C21 User Guide Page 34/38 MiCOM P721/P723 RECORDS Menu Through the RECORDS menu, stored data, events, disturbances and monitoring information can be displayed and read. The different submenus are: RECORDS Fault Instantane- Disturbance Record ous records records 2.9.1 Fault Record submenu The Fault Record submenu makes it possible to read up to twenty five stored fault records.
  • Page 75 User Guide P72x/EN FT/C21 MiCOM P721/P723 Page 35/38 2.9.2 INSTANTANEOUS RECORDS submenu Through the INSTANANEOUS RECORDS submenu, it is possible to read recorded values associated with the crossing of a threshold (start information). RECORDS Heading of the Instantaneous records submenu.
  • Page 76 Current measurement inputs MiCOM P721 and P723 have 3 phase and 1 earth current inputs available for 1 and 5 Amps rated CTs. On each one of these relays, it is possible to combine 1 and 5 Amp current inputs together (i-e a mix between 1A for earth fault and 5A for phase connections) (refer to the wiring diagram).
  • Page 77 P72y/EN CO of the Technical Guide. 3.5.2 RS232 front communication port MiCOM P72x relays provide a RS 232 communication port. This port is dedicated to Setting software MiCOM S1. The cable between the relay and the PC is a standard RS 232 shielded-cable.
  • Page 78 P72x/EN FT/C21 User Guide Page 38/38 MiCOM P721/P723 BLANK PAGE...
  • Page 79 Menu Content Tables P72x/EN HI/C21 MiCOM P721/P723 MENU CONTENT TABLES...
  • Page 80 P72x/EN HI/C21 Menu Content Tables MiCOM P721/P723 BLANK PAGE...
  • Page 81 Menu Content Tables P72x/EN HI/C21 MiCOM P721/P723 Page 1/8 CONTENTS MiCOM P721 – V11.D SOFTWARE MiCOM P723 – V11.D SOFTWARE...
  • Page 82 P72x/EN HI/C21 Menu Content Tables Page 2/8 MiCOM P721/P723 BLANK PAGE...
  • Page 83 Menu Content Tables P72x/EN HI/C21 MiCOM P721/P723 Page 3/8 MiCOM P721 – V11.D SOFTWARE...
  • Page 84 P72x/EN HI/C21 Menu Content Tables Page 4/8 MiCOM P721/P723...
  • Page 85 Menu Content Tables P72x/EN HI/C21 MiCOM P721/P723 Page 5/8...
  • Page 86 P72x/EN HI/C21 Menu Content Tables Page 6/8 MiCOM P721/P723 MiCOM P723 – V11.D SOFTWARE...
  • Page 87 Menu Content Tables P72x/EN HI/C21 MiCOM P721/P723 Page 7/8...
  • Page 88 P72x/EN HI/C21 Menu Content Tables Page 8/8 MiCOM P721/P723...
  • Page 89 Technical Data P72x/EN TD/A11 MiCOM P721/P723 TECHNICAL DATA...
  • Page 91 Technical Data P72x/EN TD/A11 MiCOM P721/P723 Page 1/18 CONTENT RATINGS Power Supply Frequency Current Inputs Phase and earth current transformers consumption 1.4.1 P72x phase CT consumption 1.4.2 P72x earth CT consumption Logic Inputs 1.5.1 Supply Output Relay Characteristic INSULATION EMC TESTS...
  • Page 92 P72x/EN TD/A11 Technical Data Page 2/18 MiCOM P721/P723 AUTOMATION CONTROL FUNCTIONS 10.1 Trip commands 10.2 Latch functions 10.3 Blocking logic 10.4 Output relays 10.5 Latch of the auxiliary output relays 10.6 Inputs 10.6.1 Inputs assignation 10.6.2 Auxiliary timers 10.7 Circuit Breaker Failure 10.7.1...
  • Page 93 Technical Data P72x/EN TD/A11 MiCOM P721/P723 Page 3/18 RATINGS Power Supply Nominal auxiliary voltage Vx 24-60Vdc; 48 -250Vdc/ 48-250 Vac 24-250Vdc/ 24-240Vac Operating range DC: ± 20% of Vx AC: – 20%, +10% of Vx Residual ripple Up to 12% ≥50 ms for interruption of Vx...
  • Page 94 P72x/EN TD/A11 Technical Data Page 4/18 MiCOM P721/P723 1.4.2 P72x earth CT consumption earth transformer 5A earth transformer 5A earth transformer 1A earth transformer 1A Current (A) Current (A) Logic Inputs Logic input type Independent optically insulated Logic input burden <...
  • Page 95 Technical Data P72x/EN TD/A11 MiCOM P721/P723 Page 5/18 Output Relay Characteristic Contact rating Contact relay Dry contact Ag Ni Make current Max. 30A and carry for 3s Carry capacity 5A continuous Rated Voltage 250Vac Breaking characteristic Breaking capacity AC 1500 VA resistive 1500 VA inductive (P.F.
  • Page 96 P72x/EN TD/A11 Technical Data Page 6/18 MiCOM P721/P723 EMC TESTS High Frequency Disturbance IEC 60255-22-1:1988 2.5kV common mode, Class III 1kV differential mode, Class III Electrostatic Discharge EN 61000-4-2: 1995 and IEC 60255-22-2: 1996 8kV contact discharge, Class 4 15kV air discharge, Class 4...
  • Page 97 Technical Data P72x/EN TD/A11 MiCOM P721/P723 Page 7/18 ENVIRONMENT Temperature IEC 60068-2-1 : 1993 Storage –25 °C to +70 °C IEC 60068-2-2: 1993 Operation: –25 °C to + 55 °C –25°C to 70° (*) (*) The upper limit is permissible for a single 6 hour duration within any 24 hour period.
  • Page 98 P72x/EN TD/A11 Technical Data Page 8/18 MiCOM P721/P723 EU DIRECTIVE EMC compliance 89/336/EEC 93/31/EEC Compliance with European Commission EMC Directive. Generic standards were used to establish conformity: EN50081-2: 1994 EN60952-2: 1995 Product safety 2006/95/EC (replacing 73/23/EEC from 01/2007) Compliance with European Commission Low Voltage Directive. Compliance is demonstrated by reference to generic safety standards: −...
  • Page 99 Technical Data P72x/EN TD/A11 MiCOM P721/P723 Page 9/18 DEVIATION OF PROTECTION ELEMENTS Element Range Deviation Fault timer Reset timer ± 2% Earth differential 0.01In to 1In 0s - 2s 0 to 600s protection (0.5 to 200V) I diff (V diff) ±...
  • Page 100 P72x/EN TD/A11 Technical Data Page 10/18 MiCOM P721/P723 PROTECTION SETTING RANGES [87N] Earth differential protection 9.1.1 Protection Setting Ranges Setting Range [87N] Earth differential protection Step [87N] Earth differential Yes / No protection [87N] Threshold I diff 0.01In 0.01In [87N] Threshold V diff 0.5V...
  • Page 101 Technical Data P72x/EN TD/A11 MiCOM P721/P723 Page 11/18 [95] Phase bus-wire supervision (P723 only) 9.4.1 Protection Setting Ranges Setting Range [95] Phase bus-wire supervision Step [95] Phase bus-wire supervision Yes / No [95] Threshold I Sup 0.02In 0.01In [95] Threshold V Sup 400V 0.1V...
  • Page 102 P723 additional functions: [87] tDiff, t Aux 3 and t Aux 4. 10.4 Output relays Alarm and trip threshold assignation to a logic output: 3 relays (P721) and 7 relays (P723). Assignable functions: − all models: [87N] Diff, [87N] tDiff, [95N] Sup, [95N] tSup, Buswire Short, CB Fail, t Aux 1, t Aux 2, Active group, Control trip, Input1 , Input2, tEqu.
  • Page 103 10.8 Logic Equations The MiCOM P721 and P723 relays integrate complete logic equations to allow customization of the product based on customer application. Up to 8 independent Boolean equations can be used (from A to H). Every result of equation can be time delayed and assigned to any output relays, trip, trip latching and/or HMI LEDs.
  • Page 104 With the Logic Equations submenu, 16 operands can be used in any single equation. The following logic signals are available for mapping to an equation: TEXT Signals (2/2) P721 and P723: Null Condition is Null Not Null Condition is not Null...
  • Page 105 Technical Data P72x/EN TD/A11 MiCOM P721/P723 Page 15/18 TEXT Signals (2/2) [95A] tSupA Time delayed phase A (or L1, or R) high impedance differential threshold (buswire supervision) [95B] tSupB As above for phase B (or L2 or S) [95C] tSupC...
  • Page 106 P72x/EN TD/A11 Technical Data Page 16/18 MiCOM P721/P723 RECORDING FUNCTIONS 11.1 Fault Record Capacity 25 faults Time-tag 1 millisecond Triggers Any selected protection alarm and threshold Data Fault date, Active setting Group, Faulted phase, Threshold, Fault magnitude, [87] tDIFF fault (tripping)
  • Page 107 Technical Data P72x/EN TD/A11 MiCOM P721/P723 Page 17/18 COMMUNICATION Type Relay Physical Link Connectors Data Rate Protocol Port position RS485 Rear port Screened Screws or 300 to 38400 baud ModBus RTU, Courier, twister pair snap-on (programmable) IEC60870-5-103, DNP3.0 RS232 Front port Screened Sub–D 9 pin...
  • Page 108 P72x/EN TD/A11 Technical Data Page 18/18 MiCOM P721/P723 BLANK PAGE...
  • Page 109 Getting Started P72x/EN GS/C21 MiCOM P721/P723 GETTING STARTED...
  • Page 111 Configuration 3.1.1 REMOTE connection Products plugged in the same panel Communication between distant products MiCOM S1 and MiCOM S1 Studio relay communications basics MiCOM S1 Studio 3.5.1 Data Model Management 3.5.2 “Quick Connection” to the relay using MiCOM S1 Studio 3.5.3...
  • Page 112 P72x/EN GS/C21 Getting Started Page 2/24 MiCOM P721/P723 BLANK PAGE...
  • Page 113 Getting Started P72x/EN GS/C21 MiCOM P721/P723 Page 3/24 ENERGISING THE RELAY To energise the relay correctly, follow the following instructions carefully. System Connections Check the wiring scheme of your installation. Check that the contacts of output relay RL1 are included in your trip circuit.
  • Page 114 The relevant information is displayed on the LCD. User interfaces and menu structure The settings and functions of the MiCOM relay can be accessed both from the front panel keypad and LCD, and via the front and rear communication ports. Information on each of these methods is given in this section to describe how to start using the relay.
  • Page 115 Getting Started P72x/EN GS/C21 MiCOM P721/P723 Page 5/24 − Validate using or cancel using . If the password is correct, the following message is displayed on the LCD: PASSWORD OK As soon as the password has been entered, no setting change will be accepted via the remote or local communication port (RS485 or RS232).
  • Page 116 P72x/EN GS/C21 Getting Started Page 6/24 MiCOM P721/P723 Menu structure The menu structure is shown below. DEFAULT DISPLAY I Diff = 1245 A OP PARAMETERS CONFIGURATION MEASUREMENTS COMMUNICATION RECORDS AUTOMAT. CTRL PROTECTION G1/G2 Refer to P72y/EN HI section for the detail of the menu.
  • Page 117 Getting Started P72x/EN GS/C21 MiCOM P721/P723 Page 7/24 LOCAL CONNECTION TO A PC Configuration S 1 S tu d M iC O M P0107ENc For a local connection between a PC and the relay, a serial cable with metallic shield should be used.
  • Page 118 P72x/EN GS/C21 Getting Started Page 8/24 MiCOM P721/P723 Products plugged in the same panel Case earth connection shield RS485 cable 1. Connect a cable (green/yellow wire) on the case earth connection of each product (with screw). 2. The communication cable shield must be connected to the pin number 29 of each product.
  • Page 119 This section is intended as a quick start guide to using MiCOM S1 Studio, and assumes you have a copy of MiCOM S1 Studio installed on your PC. Please refer to the MiCOM S1 Studio User Manual for more detailed information MiCOM S1 Studio 3.5.1...
  • Page 120 P72x/EN GS/C21 Getting Started Page 10/24 MiCOM P721/P723 The following panel is displayed: Select the “Add” option to add the new data model then click on the “next” button. The next panel is used to select the model source (CD ROM, local folder or Areva T&D FTP server).
  • Page 121 Getting Started P72x/EN GS/C21 MiCOM P721/P723 Page 11/24 The Data Model Manager loads data models details then displays automatically the language selection option panel. Select the menu language and click the “next” button. The data models panel is displayed. Select the data model for your product (for instance, to download P72x data models, Open the “Px10/Px20/Px20C/M/Modulex”...
  • Page 122 Click on “Install button”. The model files are downloaded and updated in the system. When installation has beeen completed, close the Data Model Manager. This Data Model is used with MiCOM S1 Studio when a system is opened or created. To open this default setting file, refer to § 3.5.8.
  • Page 123 Getting Started P72x/EN GS/C21 MiCOM P721/P723 Page 13/24 Click on the Quick Connect button at the top left of the application. Create a new system or open an existing one:...
  • Page 124 P72x/EN GS/C21 Getting Started Page 14/24 MiCOM P721/P723 Select “Px20 Series” from the presented options Select a port from the presented options Upon a successful connection a dialog will be displayed showing device type, model number and plant reference. Options for language, device name and comment are also available...
  • Page 125 Page 15/24 3.5.3 Create a system In MiCOM S1 Studio, a System provides a root node in the Studio Explorer from which all subsequent nodes are created. Add substations, bays, voltage levels and devices to the system. If a system is no longer needed, delete it using the delete command.
  • Page 126 P72x/EN GS/C21 Getting Started Page 16/24 MiCOM P721/P723 The new System is displayed in the Studio Explorer panel: NOTE: In the Studio Explorer panel, if an item is selected, its properties are displayed in the “Properties” panel 3.5.4 Create a new substation Select the system: the menu bar is updated with “new device”, “new substation”, “close”,...
  • Page 127 Getting Started P72x/EN GS/C21 MiCOM P721/P723 Page 17/24 The new substation is displayed and the menu bar is updated when a substation is selected: Import SCL Import SCL Create a new voltage level Create a new voltage level Click on “Import SCL” button to import a Substation Configuration File.
  • Page 128 P72x/EN GS/C21 Getting Started Page 18/24 MiCOM P721/P723 3.5.7 Create a new device Click on “new device” button (or select the menu using right-click). Select the device type and, if necessary, the communications protocole mode that will be used to send the file to the device.
  • Page 129 Getting Started P72x/EN GS/C21 MiCOM P721/P723 Page 19/24 The new device is created and displayed. If necessary, select the MiCOM P72x model using the “OP PARAMETERS/Description” menu. 3.5.8 Open Settings File To open an existing file: − If the file is saved or if the relay is not connected: open the Settings folder and open the Settings file, −...
  • Page 130 P72x/EN GS/C21 Getting Started Page 20/24 MiCOM P721/P723 To open default settings: − Click on “Open Default Settings File” Option in the File menu. − Select the device type then the communication protocol. − Select the device type and click on the “Next” button:...
  • Page 131 Page 21/24 Presentation and analysis od disturbance The reading and analisys of disturbance is performed using Wavewin. To open Wavewin using “Tools” menu (MiCOM S1 Studio). The Wavewin File Manager is displayed (refer to the Wavewin User’s guide to operate Wavewin).
  • Page 132 P72x/EN GS/C21 Getting Started Page 22/24 MiCOM P721/P723 WITHDRAWING MODULE FROM CASE Remove the top and bottom hinged covers: Depose the four retaining screws in the top and the bottom side of the relay. These screws retain the relay to the case.
  • Page 133 Getting Started P72x/EN GS/C21 MiCOM P721/P723 Page 23/24 Insert a 3mm screwdriver into the hole situated under the upper hinged cover above the LCD: Turn the lock pin 90° to the left: Insert the screwdriver into the second hole under the lower hinged cover, and the lower lock pin is turned 90°...
  • Page 134 MiCOM P721/P723 COMPANY CONTACT INFORMATION If you need information pertaining to the operation of this MiCOM product that you have purchased, please contact your local Schneider Electric agent or the Customer Care Center (www.schneider-electric.com/ccc). Do not forget to give the serial number and reference of the MiCOM product.
  • Page 135 Application Guide P12x/EN AP/C21 MiCOM P721/P723 APPLICATION GUIDE...
  • Page 137 One and a Half Breaker Scheme High Impedance Differential Protection 2.6.1 Use of non-linear resistors Current distribution - internal and external faults APPLYING THE MiCOM P72X Single phase applications: restricted earth fault and balanced earth fault protection Three phase applications Buswire supervision...
  • Page 138 P72x/EN AP/C21 Application Guide Page 2/52 MiCOM P721/P723 SETTING GROUP SELECTION (P721 & P723 ONLY) Change of setting group done by a digital input Switch between active groups Priority MAINTENANCE MODE LOGIC EQUATIONS (P721 & P723) REAL TIME CLOCK SYNCHRONIZATION VIA OPTO-INPUTS...
  • Page 139 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 3/52 INTRODUCTION P72x High Impedance Differential Relay The P72x relay, used with a stabilizing resistor, is designed for applications where sensitive settings and stability on heavy through faults are required. It is recommended for balanced and restricted earth fault schemes, bus-zone and certain forms of differential protection for generators, auto-transformers, reactors and motors.
  • Page 140 P72x/EN AP/C21 Application Guide Page 4/52 MiCOM P721/P723 Transformer Protection The P72x can be applied as a high impedance REF to protect the transformer windings. In a star-connected winding, particularly when the neutral is grounded through an impedance, the degree of protection is improved when a high impedance REF is applied.
  • Page 141 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 5/52 BUSBAR CONFIGURATIONS There are several busbar arrangements depending on the economics and flexibility of system operation. In addition to plain single and double busbar schemes, the following are some other popular arrangements. The following figures show the zone of protection of several busbar arrangements.
  • Page 142 P72x/EN AP/C21 Application Guide Page 6/52 MiCOM P721/P723 FIGURE 2: DOUBLE BUSBAR WITH TRANSFER Triple busbar This is a double busbar scheme with a third, transfer busbar. Under normal conditions all bus section and bus coupler breakers are closed. During...
  • Page 143 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 7/52 Mesh Busbar Scheme The mesh busbar scheme is frequently used for EHV busbar configurations. A transformer and a feeder are linked at each corner of the mesh and four circuit breakers used to complete the mesh interconnection.
  • Page 144 P72x/EN AP/C21 Application Guide Page 8/52 MiCOM P721/P723 One and a Half Breaker Scheme Under normal conditions all breakers are closed. During maintenance of a feeder breaker, only that breaker would be kept open. During maintenance of a busbar, all the breakers connected to that busbar would remain open to isolate that busbar.
  • Page 145 Page 9/52 High Impedance Differential Protection The application of the MiCOM P72x to the protection of machines, power transformers and busbar installations is based on the high impedance differential principle. The P72x offers stability for any type of fault occurring outside the protected zone and satisfactory operation for faults within the zone.
  • Page 146 P72x/EN AP/C21 Application Guide Page 10/52 MiCOM P721/P723 The relay is prevented from unwanted operation because most of the current will flow in the + 2R loop since R >> R + 2R ×(2R A voltage will develop across the relay. This voltage is equal to I ).
  • Page 147 NOTE: The maximum internal fault level for the single phase CT input in the P721 and P723 must not exceed 20In. The current transformers used in a high impedance scheme should be of equal ratio, of similar magnetizing characteristics and of low reactance construction. In cases where low...
  • Page 148 P72x/EN AP/C21 Application Guide Page 12/52 MiCOM P721/P723 As a result, I is calculated as follows: − The stabilizing resistor is calculated as follows: − , the relay resistance, can be neglected in the P72x. The standard resistors that are supplied for use in the high impedance application are wire- wound, continuously adjustable and have a continuous rating of 145 W based on Schneider Electric conjunctive testing.
  • Page 149 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 13/52 2.6.1 Use of non-linear resistors When the maximum through fault current is limited by the protected circuit impedance, such as in the case of generator differential and power transformer restricted earth fault protection, it is generally unnecessary to use non-linear voltage limiting resistors.
  • Page 150 P72x/EN AP/C21 Application Guide Page 14/52 MiCOM P721/P723 With a sinusoidal voltage applied across the Metrosil, the rms current is as follows: ⎛ ⎞ ⎜ ⎟ ⎜ ⎟ ⎝ ⎠ Where: VRMS = rms value of the sinusoidal voltage applied across the Metrosil This is due to the fact that the current waveform through the Metrosil is not sinusoidal but appreciably distorted.
  • Page 151 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 15/52 The Metrosil units normally recommended for use with 5 A CTs and single pole relays are shown in the following table: Secondary Recommended Metrosil Type Internal fault current Relay Voltage Setting Amps rms...
  • Page 152 P72x/EN AP/C21 Application Guide Page 16/52 MiCOM P721/P723 FIGURE 11: EXTERNAL FAULT – SINGLE BUSBAR Consider the current distributions during an internal fault in the single busbar diagram shown in FIGURE 12. During an internal fault, the high impedance path (stabilizing resistor + relay burden) forces most of the secondary current through the CT magnetizing branch.
  • Page 153 P72x/EN AP/C21 MiCOM P721/P723 Page 17/52 APPLYING THE MICOM P72X To allocate the chosen protection elements (e.g. Trip [87] tDiff or Trip [87N] tDiff) to the trip relay RL1, select AUTMAT.CTRL > Trip Commands. Any elements allocated in the trip commands menu will cause RL1 to pulse for 100 ms.
  • Page 154 MiCOM P721/P723 FIGURE 13: REF/BEF APPLICATIONS – P72X GENERAL DIAGRAM FIGURE 14 to FIGURE 17 show how the P721 is implemented in REF and BEF applications using 1 A connections. FIGURE 14: RESTRICTED EARTH FAULT PROTECTION OF A 3 PHASE, 3 WIRE...
  • Page 155 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 19/52 P1522ENd FIGURE 15: BALANCED EARTH FAULT PROTECTION FOR THE DELTA WINDING OF A POWER TRANSFORMER WITH THE SUPPLY SYSTEM EARTHED (1 A CONNECTIONS SHOWN) FIGURE 16: RESTRICTED EARTH FAULT PROTECTION OF A 3 PHASE, 4 WIRE...
  • Page 156 P72x/EN AP/C21 Application Guide Page 20/52 MiCOM P721/P723 P1524ENc FIGURE 17: RESTRICTED EARTH FAULT PROTECTION OF A 3 PHASE, 4 WIRE SYSTEM APPLICABLE TO STAR CONNECTED GENERATORS OR POWER TRANSFORMER WINDINGS WITH NEUTRAL EARTHED AT THE GENERATOR/TRANSFORMER STARPOINT. Three phase applications...
  • Page 157 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 21/52 FIGURE 18: THREE PHASE APPLICATIONS – P72X GENERAL DIAGRAM Each discriminating zone relay and the check zone relay should have a contact configured to raise an alarm whenever the time delayed supervision element is asserted.
  • Page 158 P72x/EN AP/C21 Application Guide Page 22/52 MiCOM P721/P723 49 R A 51 R B 53 R C Protective relays P1525ENb FIGURE 20: PHASE AND EARTH FAULT DIFFERENTIAL PROTECTION FOR AN AUTO- TRANSFORMER WITH CTS AT THE NEUTRAL STAR POINT 49 R...
  • Page 159 AC wires to prevent thermal damage to the scheme. This is especially important when using the P79x to help with energy dissipation. When using the P721 in busbar applications (three P721 would be required), configure the buswire shorting contact as follows: •...
  • Page 160 FIGURE 23. A normally closed contact from the auxiliary relay is used to short the high impedance path when the P721 is out of service. An additional contact from the auxiliary relay is required to give an alarm to the SCADA system when the P721 is out of service.
  • Page 161 NOTES: The protection watchdog contact is normally open. It is closed when the P721 is healthy. Therefore Aux-1 is closed when the P721 is not healthy. 2. RL2 is a normally open contact. It closes when there is an ac buswire failure or the differential element is asserted.
  • Page 162 P72x/EN AP/C21 Application Guide Page 26/52 MiCOM P721/P723 Logic output relay 5 tEqu.C = 0000000000000100 Logic output relay 6 As shown in FIGURE 24, the buswire shorting is asserted when either the protection trips or the buswire supervision element is asserted.
  • Page 163 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 27/52 The high impedance path should also be shorted when the buswire supervision asserts. This can be done using normally open contacts configured as explained previously. This is also shown in FIGURE 25.
  • Page 164 P72x/EN AP/C21 Application Guide Page 28/52 MiCOM P721/P723 Circuit breaker failure The P72x has one circuit breaker failure function. The current considered by the CBF function is the differential current, therefore the current flowing through a particular circuit breaker is not considered. If the CBF function in the P72x is asserted and the breaker is still closed, the 86BF associated to that particular breaker should be energized.
  • Page 165 FIGURE 27 shows the application of a high impedance REF to protect the LV winding of a power transformer. In this example assume that the Input selection in the P721 is set to Voltage. Therefore, the Stabilizing Resistor N needs to be set. The P721 calculates the relay operating current using the set Voltage and Stabilizing Resistor N.
  • Page 166 P72x/EN AP/C21 Application Guide Page 30/52 MiCOM P721/P723 0.20 0.07 average op. time 0.30 0.06 0.40 0.05 0.50 0.04 0.60 0.70 0.03 0.80 unstable 0.02 stable 0.90 0.01 1.00 1.10 Vk/Vs FIGURE 28: VARIATION OF K AND THE AVERAGE OPERATING TIME AS A FUNCTION OF VK/VS –...
  • Page 167 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 31/52 Kneepoint Voltage, × 26.78 108V If the actual Vk is greater than 4 times Vs, the K factor increases. In this case Vs should be recalculated considering the new K factor and using equation .
  • Page 168 P72x/EN AP/C21 Application Guide Page 32/52 MiCOM P721/P723 4.1.1.6 Relay settings The P72x differential element settings are as follows: The trip command should be configured as Trip [87N] tDiff, so that relay output 1 is asserted when the differential element operates:...
  • Page 169 Example 2 FIGURE 29 shows the application of a high impedance REF to protect the LV winding of a resistance earthed transformer. In this example assume that the Input selection in the P721 is set to Current. 33 kV 600/1...
  • Page 170 P72x/EN AP/C21 Application Guide Page 34/52 MiCOM P721/P723 0.20 0.07 average op. time 0.30 0.06 0.40 0.05 0.50 0.04 0.60 0.70 0.03 0.80 unstable 0.02 stable 0.90 0.01 1.00 1.10 Vk/Vs FIGURE 30: VARIATION OF K AND THE AVERAGE OPERATING TIME AS A FUNCTION OF VK/VS –...
  • Page 171 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 35/52 4.1.2.4 Primary operating current calculation Assuming that the relay effective setting or primary operating current for a resistance earthed power transformer should not exceed 10-25% of the minimum earth fault current, we can calculate the relay effective setting as follows: ×...
  • Page 172 P72x/EN AP/C21 Application Guide Page 36/52 MiCOM P721/P723 4.1.2.7 Non-linear resistor If the peak voltage developed across the relay circuit under maximum internal fault conditions exceeds 3000 V peak, a suitable non-linear resistor should be connected across the relay and stabilizing resistor, to protect the insulation of the CTs, relay and interconnecting leads.
  • Page 173 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 37/52 The trip command should be configured as Trip [87N] tDiff, so that relay output 1 is asserted when the differential element operates: Busbar applications FIGURE 31 shows an application of the P72x for high impedance protection of a typical 132 kV double bus generating station, consisting of two 100 MVA generators and step-up transformers, two bus-couplers and four overhead transmission lines.
  • Page 174 P72x/EN AP/C21 Application Guide Page 38/52 MiCOM P721/P723 FIGURE 32: CURRENT TRANSFORMER SWITCHING CONFIGURATION Likewise, the trip and blocking contacts from busbar 1 and busbar 2 high impedance differential schemes should be switched according to the status of the isolators. In this case normally closed and open auxiliary contacts are needed.
  • Page 175 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 39/52 For the purpose of this example it is assumed that all switchgear is rated for 3500 MVA and solidly earthed. All circuits have the same CT ratio of 500/1A with a secondary winding resistance of 0.7 Ω...
  • Page 176 P72x/EN AP/C21 Application Guide Page 40/52 MiCOM P721/P723 4.2.2 Current transformers Assuming that the CT is a 30 VA 5P20, the knee point voltage can be calculated as: × × The CTs knee point voltage should be at least 4 times Vs so that an average operating time of 30 ms is achieved: , since Vk/Vs = 8.1, a K factor equal to 0.89 should not used because the...
  • Page 177 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 41/52 4.2.4 Check zone - Primary operating current calculation For phase fault schemes, the check zone is set similarly to the discriminating zone. A set of different current transformers from those used in the discriminating zone are required. No CT switching is required, and no current transformers from the bus coupler or bus section breakers are needed.
  • Page 178 P72x/EN AP/C21 Application Guide Page 42/52 MiCOM P721/P723 4.2.6 Non-linear resistor If the peak voltage developed across the relay circuit under maximum internal fault conditions exceeds 3000 V peak then a suitable non-linear resistor should be connected across the relay and stabilizing resistor to protect the insulation of the CTs, relay and interconnecting leads.
  • Page 179 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 43/52 4.2.8 Relay Settings The differential element (either check zone or discriminating zone) should be set as follows: The buswire supervision element should be set as follows: The trip command should be configured as Trip [87] tDiff, so that relay output 1 is asserted...
  • Page 180 P72x/EN AP/C21 Application Guide Page 44/52 MiCOM P721/P723 Motor / generator applications The same calculation principles that apply for the three phase protection of busbars can be applied to motors and generators, although special consideration of the fault current will be required.
  • Page 181 Page 45/52 SETTING GROUP SELECTION (P721 & P723 ONLY) MiCOM P721 and P723 relays have two setting groups associated to the protection functions named PROTECTION G1 and PROTECTION G2. Only one group is active. Switching between the groups can be done using: −...
  • Page 182 P72x/EN AP/C21 Application Guide Page 46/52 MiCOM P721/P723 Priority When changing parameters through the front panel, the priority is given to the user that takes local control of the relay when entering a password. Change of the setting group using a remote command is not allowed while the password is active (5 minutes).
  • Page 183 1 to any of the output contacts, which will close the contact, and the continuity of the wiring can be verified. LOGIC EQUATIONS (P721 & P723) The logic equations can be used to construct complex Boolean logic using the following operators: AND NOT, OR NOT, AND, OR.
  • Page 184 P72x/EN AP/C21 Application Guide Page 48/52 MiCOM P721/P723 EVENT RECORDS The relay records and time tags up to 250 events and stores them in a non-volatile (flash) memory. This allows the system operator to analyze the sequence of events that occurred in the relay after a particular power system condition, or switching sequence.
  • Page 185 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 49/52 CT REQUIREMENTS The P72x CT requirements are indicated with respect to the Measurement Filter setting and the application. The following CT requirements are for busbar and REF/BEF applications considering the three measurement filter modes.
  • Page 186 Vk/Vs, K factor and average operating time as has been explained in the previous setting examples. NOTE: For the P721 and the P723 (current inputs 55-56 and 47-48), the maximum internal fault level threshold (for the 0.004 to 2In range) must not exceed 20In.
  • Page 187 Application Guide P72x/EN AP/C21 MiCOM P721/P723 Page 51/52 FIGURE 37 shows the CT requirements when the P72x is used in a REF/BEF application and the Measurement Mode is set to Sample. The maximum K factor is approximately 0.91. The operating time when V = 4 is 55 ms and K is approximately 0.76.
  • Page 188 P72x/EN AP/C21 Application Guide Page 52/52 MiCOM P721/P723 FIGURE 39 shows the CT requirements when the P72x is used in a busbar application and the Measurement Mode is set to Fast Sample. The maximum K factor is approximately 0.82. When V is equal to 4, the average operating time is 34 ms and K is approximately 0.80.
  • Page 189 Communication database P72x/EN CT/A11 MiCOM P721/P723 COMMUNICATION DATABASE...
  • Page 190 P72x /EN CT/A11 Communication database MiCOM P721/P723 BLANK PAGE...
  • Page 191 Communication database P72x/EN CT/A11 MiCOM P721/P723 MODBUS DATABASE MiCOM P721/P723 VERSION V11...
  • Page 192 P72x/EN CT/A11 Communication database Page 2/78 MiCOM P721/P723 BLANK PAGE...
  • Page 193 MODBUS functions of the MiCOM relays Presentation of the MODBUS protocol 2.6.1 Frame size received by the protection device (slave) 2.6.2 Format of frames sent by the MiCOM relays 2.6.3 Messages validity check MiCOM P721 AND P723 RELAY DATABASE ORGANISATION Description of the application mapping 3.1.1...
  • Page 194 P72x/EN CT/A11 Communication database Page 4/78 MiCOM P721/P723 3.17 Pages 38h to 3Ch – Disturbance record and channel selection 3.17.1 Disturbance record and channel selection (13 words) 3.17.2 Calculation formula for phase current values 3.17.3 Calculation formula for earth current values 3.18...
  • Page 195 MiCOM P721/P723 Page 5/78 INTRODUCTION Purpose of this document This document describes the characteristics of the different communication protocol of MiCOM P721 and P723 relays. The available communication protocols on the relay are listed below: − MODBUS, − IEC 60870-5-103, −...
  • Page 196 Communication database Page 6/78 MiCOM P721/P723 MODBUS PROTOCOL MiCOM P721 and P723 relays can communicate by a RS 485 link behind the unit following the MODBUS RTU protocol. Technical characteristics of the MODBUS connection 2.1.1 Parameters of the MODBUS connection The different parameters of the MODBUS connection are as follows: −...
  • Page 197 − control of data address, − length of request for data message. CRC16: Value of the CRC16 calculated by the master. NOTE: The MiCOM relay does not respond to globally broadcast frames sent out by the master.
  • Page 198 When MiCOM P721 and P723 relays receive a master query, it validates the frame: − If the CRC is false, the frame is invalid. MiCOM 721 and P723 relays do not reply to the query. The master must retransmit its query. Excepting a broadcast message, this is the only case of non-reply by MiCOM P721 and P723 relays to a master query.
  • Page 199 Page 9/78 MiCOM P721 AND P723 RELAY DATABASE ORGANISATION Description of the application mapping 3.1.1 Settings MiCOM P721 and P723 application mapping has 7 pages of parameters. Parameters are organized in pages. The characteristics are the following: Page Data type...
  • Page 200 P72x/EN CT/A11 Communication database Page 10/78 MiCOM P721/P723 Values Form Fault Address Group Description Step Unit Range range Value 000C LED Status Binary (health 000D Real Active Setting 1 – 2 Group (after taking into account the protection flags) 000E Password active ? 0 –...
  • Page 201 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 11/78 Values Form Fault Address Group Description Step Unit Range range Value 002F measure- Frequency 4500 – 10 mHz F1 9999 ments 6500 9999 if out 0030–0031 Phase A RMS value 0 – 600 10 mA F18 0032–0033...
  • Page 202 P72x/EN CT/A11 Communication database Page 12/78 MiCOM P721/P723 Values Form Fault Address Group Description Step Unit Range range Value 00E0– HMI screen Copy of the HMI screen ASCII 16 x 00EF code 00F0– Reserved 00FF Page 1h – General remote parameters (part 1)
  • Page 203 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 13/78 Values Fault Address Group Description Step Unit Format Range range Value 0130 Rear port Baud rate 0 – 7 6 (19200 communi-cation 0131 Parity 0 – 2 (without) 0132 Data bits 0 – 1...
  • Page 204 P72x/EN CT/A11 Communication database Page 14/78 MiCOM P721/P723 Values Fault Address Group Description Step Unit Format Range range Value 0168– Logical input 3 Binary 0 (no 0169 conf.) 016A– Reserved 016B 016C– Logical input 4 Binary 0 (no 016D conf.) 016 –...
  • Page 205 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 15/78 Values Fault Address Group Description Step Unit Format Range range Value 0198 tEquation A Binary 0 (no conf.) 0199 tEquation B Binary 0 (no conf.) 019A tEquation C Binary 0 (no conf.)
  • Page 206 P72x/EN CT/A11 Communication database Page 16/78 MiCOM P721/P723 Values Fault Address Group Description Step Unit Format Range range Value 01C8– Reserved 01CF 01D0 CB failure CB failure function ? 0 - 1 0 (no) [50BF] 01D1 Idiff< CB failure 1 – 100...
  • Page 207 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 17/78 Values Fault Address Group Description Step Unit Format Range range Value 0225 [95] Filter of analog input 1, 3, 4 protection (Sampl mode) 0226– Reserved 023F 0240 [87N] E/gnd [87N] DIFF function ? 0 –...
  • Page 208 P72x/EN CT/A11 Communication database Page 18/78 MiCOM P721/P723 Page 5h – Boolean equations remote parameters Read and write access. Address Def. Group Description Values range Step Unit Format (hex) Value 0500 Bool Equations Equation A.00 operator 0 – 1 0501 Equation A.00 operand...
  • Page 209 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 19/78 Address Def. Group Description Values range Step Unit Format (hex) Value 0537 Equation B.11 operand 0 – 24 0538 Equation B.12 operator 0 – 3 0539 Equation B.12 operand 0 – 24 053A Equation B.13 operator...
  • Page 210 P72x/EN CT/A11 Communication database Page 20/78 MiCOM P721/P723 Address Def. Group Description Values range Step Unit Format (hex) Value 0572 Equation D.09 operator 0 – 3 0573 Equation D.09 operand 0 – 24 0574 Equation D.10 operator 0 – 3 0575 Equation D.10 operand...
  • Page 211 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 21/78 Address Def. Group Description Values range Step Unit Format (hex) Value 05AD Equation F.06 operand 0 – 24 05AE Equation F.07 operator 0 – 3 05AF Equation F.07 operand 0 – 24 05B0 Equation F.08 operator...
  • Page 212 P72x/EN CT/A11 Communication database Page 22/78 MiCOM P721/P723 Address Def. Group Description Values range Step Unit Format (hex) Value 05E8 Equation H.04 operator 0 – 3 05E9 Equation H.04 operand 0 – 24 05EA Equation H.05 operator 0 – 3 05EB Equation H.05 operand...
  • Page 213 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 23/78 Else format is ( Inverted IEC 870-5-4 CP56Time2a): Values Fault Address Group Description Step Unit Format range Value 0800 Date Year : 00 – 99 : Year 1994 – 1999 94 – 99 2000 –...
  • Page 214 P72x/EN CT/A11 Communication database Page 24/78 MiCOM P721/P723 3.11.1 Meaning of each value channel • IA, IB, IC and I channels: The value is an signed 16 bits word equivalent to the ADC value 3.11.2 Calculation formula for phase current values Line phase current value (primary value) = phase sampled value x phase primary CT / phase internal CT ratio (mapping address 0007 = 800) x √2...
  • Page 215 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 25/78 3.13 Page 35h Addresses 3500h to 354Ah. Addresses (hex) Contents 3500 Event records 1 3501 Event records 2 … … 354A Event records 250 Event record data (9 words) Word n° 1: Event code Word n°...
  • Page 216 P72x/EN CT/A11 Communication database Page 26/78 MiCOM P721/P723 MODBUS COURIER Code Meaning of the event Type address Cell F38 word 1↑ ↓ tAux 1 F38 word 1 ↑ ↓ Yes tAux 2 F38 word 1 ↑ ↓ Yes CB Failure (50BF) F20 word 1 ↑...
  • Page 217 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 27/78 MODBUS COURIER Code Meaning of the event Type address Cell F22 ↑ ↓ Trip output relay latched F38 word 1 ↑ ↓ Yes tAux 3 tAux 3 fault (tripping) F38 word 1 ↑ ↓ Yes...
  • Page 218 P72x/EN CT/A11 Communication database Page 28/78 MiCOM P721/P723 3.15 Page 37h – Fault record value data Access in word reading (function 03) Addresses Contents 3700h Fault value record n°1 3701h Fault value record n°2 3702h Fault value record n°3 …...
  • Page 219 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 29/78 3.17 Pages 38h to 3Ch – Disturbance record and channel selection Selection of the disturbance record and channel (11 to 13 words are uploaded for each address reading) Access in word reading (function 03)
  • Page 220 P72x/EN CT/A11 Communication database Page 30/78 MiCOM P721/P723 3.17.2 Calculation formula for phase current values Line phase current value (primary value) = phase sampled value (e.g. address 3800h, 3801h or 3802h) x phase primary CT x (1 / phase internal CT ratio*) x √2 (*) Mapping address 0007h 3.17.3...
  • Page 221 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 31/78 Words n° 26 & 27: Previous disturbance record date (millisecond) Word n° 28: Disturbance record starting origin 1= trip relay (RL1) 2= instantaneous threshold 3= remote command 4= logic input Word n° 29: Acknowledge Word n°...
  • Page 222 P72x/EN CT/A11 Communication database Page 32/78 MiCOM P721/P723 DESCRIPTION OF THE MAPPING FORMAT CODE DESCRIPTION Unsigned integer – numerical data: 0 to 65535 Signed integer – numerical data: -32768 to 32767 Reserved Unsigned integer: MODBUS speed 0: 300 bd 1: 600 bd...
  • Page 223 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 33/78 CODE DESCRIPTION Unsigned integer: Blocking logic (based on F6) Word 1: bit 0: bit 1: [87] tDIFF bit 2: bit 3: bit 4: [87N] tDIFF bit 5: bit 6: bit 7: bit 8:...
  • Page 224 P72x/EN CT/A11 Communication database Page 34/78 MiCOM P721/P723 CODE DESCRIPTION bit 8 (bit 24): bit 9 (bit 25): bit 10 (bit 26): bit 11 (bit 27): bit 12 (bit 28): bit 13 (bit 39): bit 14 (bit 30): All records suppres. (alarms, events, faults, inst., stat. and dist.)
  • Page 225 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 35/78 CODE DESCRIPTION Unsigned integer: Logic outputs relay bit 0: logic output number RL1 (tripping) bit 1: logic output number RL2 bit 2: logic output number RL3 bit 3: logic output number RL4...
  • Page 226 P72x/EN CT/A11 Communication database Page 36/78 MiCOM P721/P723 CODE DESCRIPTION Unsigned integer: threshold phase information status bit 0: information of phase threshold exceeded bit 1: Instantaneous line A bit 2: Instantaneous line B bit 3: Instantaneous line C bit 4: reserved...
  • Page 227 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 37/78 CODE DESCRIPTION bit 9 (bit 41): bit 10 (bit 42): bit 11 (bit 43): bit 12 (bit 44): bit 13 (bit 45): bit 14 (bit 46): bit 15 (bit 47): Word 4:...
  • Page 228 P72x/EN CT/A11 Communication database Page 38/78 MiCOM P721/P723 CODE DESCRIPTION Unsigned integer: Status of the relay functions 0: Disabled / No 1: Enabled / Yes Reserved Phases and Earth identifier Phase1 Phase2 Phase3 “L1” “L2” “L3” “ A” “ B”...
  • Page 229 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 39/78 CODE DESCRIPTION bit 13 (bit 29): bit 14 (bit 30): bit 15 (bit 31): Word 3 bit 0 (bit 32): tEquation A bit 1 (bit 33): tEquation B bit 2 (bit 34): tEquation C...
  • Page 230 P72x/EN CT/A11 Communication database Page 40/78 MiCOM P721/P723 CODE DESCRIPTION Reserved Reserved Reserved Unsigned integer: Material alarm status bit 0: Watch-Dog operating * bit 1: Communication failure bit 2: Program data failure * bit 3: Analogue input failure * bit 4: Datation failure...
  • Page 231 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 41/78 CODE DESCRIPTION Unsigned integer : Fail safe and inversion relays bit 0 : Fail safe logic output number RL1 (tripping) bit 1 : Fail safe logic output number RL2 bit 2 : Inversion logic output number RL3...
  • Page 232 P72x/EN CT/A11 Communication database Page 42/78 MiCOM P721/P723 CODE DESCRIPTION Unsigned integer: 1st operator for Boolean equations 0 : NULL 1 : NOT Unsigned integer: Other than 1st operator for Boolean equations 0 : OR 1 : OR NOT 2 : AND...
  • Page 233 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 43/78 CODE DESCRIPTION Unsigned integer: Keyboard remote control word. Only one bit simultaneously. The bit active simulate a pressure on the key. bit 0: CLEAR key bit 1: ALARM key bit 2: UP key...
  • Page 234 P72x/EN CT/A11 Communication database Page 44/78 MiCOM P721/P723 CODE DESCRIPTION Unsigned integer: Measurements transmission enabling for IEC870-5-103 communication 0 : None 1 : ASDU3.4 only 2: ASDU 9 only 3 : ASDU3.4 + ASDU 9 Unsigned integer: Source of the disturbance recording start.
  • Page 235 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 45/78 4.1.4 Disturbance record upload request Slave number Function code Word address Word number 22h to 00 01 to 7Dh This request may be answered an error message with two different error codes:...
  • Page 236 P72x/EN CT/A11 Communication database Page 46/78 MiCOM P721/P723 4.1.8 Modbus request definition used to retrieve the fault records Two ways can be followed to retrieve a fault record: Send a request to retrieve the oldest non-acknowledge fault record. Send a request to retrieve a dedicated fault record.
  • Page 237 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 47/78 IEC 60870-5-103 DATABASE MiCOM P721/P723 VERSION V11...
  • Page 238 P72x/EN CT/A11 Communication database Page 48/78 MiCOM P721/P723 BLANK PAGE...
  • Page 239 1.11 Disturbance records 1.12 Blocking of monitor direction APPENDIX 1 Spontaneous messages managed by MiCOM P72x List of data contained in General Interrogation Processed Commands Relay re initialization Cyclic Messages (Class 2 – measurements) IEC870-5-103 messages for Disturbance record extraction...
  • Page 240 P72x/EN CT/A11 Communication database Page 50/78 MiCOM P721/P723 BLANK PAGE...

  • Page 241: Physical Connection And Link Layer

    Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 51/78 IEC60870-5-103 INTERFACE The IEC60870-5-103 interface is a master/slave interface with the relay as the slave device. This protocol is based on the VDEW communication protocol. The relay conforms to compatibility level 2, compatibility level 3 is not supported.

  • Page 242: Message Validity Check

    P72x/EN CT/A11 Communication database Page 52/78 MiCOM P721/P723 Message validity check The validation of a frame is performed with a 16-bit Cyclical Redundancy Check (CRC). Generator polynomial: 1+x²+x = 1010 0000 0000 0001 (binary) = A001 (hexadecimal) IEC870-5-103 address A slave address is defined in the range 1-254.

  • Page 243: Cyclic Measurements

    Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 53/78 Cyclic measurements The relay will produce measured values using ASDU 9 and ASDU 3.4 on a cyclical basis, this can be read from the relay using a Class 2 poll. It should be noted that the measurands transmitted by the relay are sent as a proportion of 2.4 times the rated value of the analogue value.

  • Page 244: Appendix

    Page 54/78 MiCOM P721/P723 APPENDIX 1 Spontaneous messages managed by MiCOM P72x These messages include a sub-assembly of events which are generated on the relay, because some generated events are not registered in VDEW. They are the most priority messages.
  • Page 245 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 55/78 Status indications in Availability monitor direction Logical input 1: FUN<210>;INF <160>; TYP <1>; COT<1>,<ADDR>↑↓ Logical input 2: FUN<210>;INF <161>; TYP <1>; COT<1>,<ADDR>↑↓ Logical input 3: FUN<210>;INF <162>; TYP <1>; COT<1>,<ADDR>↑↓ Logical input 4: FUN<210>;INF <163>;...
  • Page 246 P72x/EN CT/A11 Communication database Page 56/78 MiCOM P721/P723 Supervision Indications in Availability monitor direction Start / pick-up [95] Diff>: FUN<210>;INF <9>; TYP <2>; COT<1>,<ADDR>↑↓ Start / pick-up [87] Diff>>: FUN<210>;INF <10>; TYP <2>; COT<1>,<ADDR>↑↓ Start / pick-up [95N] Diff>: FUN<210>;INF <12>; TYP <2>;...

  • Page 247: List Of Data Contained In General Interrogation

    Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 57/78 Supervision Indications in Availability monitor direction Trip Equation G: FUN<210>;INF <198>; TYP <2>;COT<1>,<ADDR>,↑↓ Trip Equation H: FUN<210>;INF <199>; TYP <2>;COT<1>,<ADDR>,↑↓ The double arrow ↑↓ means that the event generated on event NOTE: occurrence and another event is generated on event disappearing.
  • Page 248 P72x/EN CT/A11 Communication database Page 58/78 MiCOM P721/P723 Status Indications (monitor Availability direction) Group Warning (Minor hardware FUN<208>;INF <46>; TYP <1>; alarm): COT<9>,<ADDR> Group Alarm (Major hardware FUN<208>;INF <47>; TYP <1>; alarm): COT<9>,<ADDR> General Start / pick-up: FUN<208>;INF <84>; TYP <2>;...

  • Page 249: Processed Commands

    General Commands (ASDU Availability 20) (Control Direction) LEDs Reset: This command FUN<208>;INF<19>, TYP<20>, COT acknowledge all alarms on Front <20>,<ADDR> Panel on MiCOM P72x products: Setting group number 1: FUN<208>;INF<23>, TYP<20>, COT <20>,<ADDR> Setting group number 2: FUN<208>;INF<24>, TYP<20>, COT <20>,<ADDR>...

  • Page 250: Relay Re Initialization

    P72x/EN CT/A11 Communication database Page 60/78 MiCOM P721/P723 General Commands (ASDU Availability 20) (Control Direction) Trip TC: FUN<210>;INF <1>; TYP <20>; COT<20>,<ADDR> Disturbance trig: FUN<210>;INF <3>; TYP <20>; COT<20>,<ADDR> Maintenance mode trig: FUN<210>;INF <7>; TYP <20>; COT<20>,<ADDR> After executing one of these commands, the relay sends an acknowledge message, which contains the result of command execution.

  • Page 251: Iec870-5-103 Messages For Disturbance Record Extraction

    IEC870-5-103 messages for Disturbance record extraction The disturbance extraction procedure with IEC870-5-103 in MICOM Px2x relays is in conformance with IEC870-5-103 standard definition. The maximum disturbance record number stored in a P721 and P723 is 5. The disturbance record mapping is the following: −...
  • Page 252 P72x/EN CT/A11 Communication database Page 62/78 MiCOM P721/P723 BLANK PAGE...
  • Page 253 Communication database P72x/EN CT/A11 MiCOM P721/P723 DNP 3.0 DATABASE MiCOM P721/P723 VERSION V11...
  • Page 254 P72x/EN CT/A11 Communication database Page 64/78 MiCOM P721/P723 BLANK PAGE...
  • Page 255 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 65/78 CONTENTS INTRODUCTION Purpose of this document DNP V3.00 device Profile Implementation Table Point List 1.4.1 Binary Input Points 1.4.2 Binary Output Status Points and Control Relay Output Blocks 1.4.3 Counters 1.4.4 Analog Inputs...
  • Page 256 P72x/EN CT/A11 Communication database Page 66/78 MiCOM P721/P723 BLANK PAGE...
  • Page 257 Purpose of this document The purpose of this document is to describe the specific implementation of the Distributed Network Protocol (DNP) 3.0 within P72x MiCOM relays. P72x uses the Triangle MicroWorks, Inc. DNP 3.0 Slave Source Code Library Version 2.18.
  • Page 258 P72x/EN CT/A11 Communication database Page 68/78 MiCOM P721/P723 DNP V3.00 DEVICE PROFILE DOCUMENT (ALSO SEE THE IMPLEMENTATION TABLE IN SECTION 1.3, BEGINNING ON PAGE 70). Vendor Name: Schneider Electric Device Name: SERIAL 20 Platform using the Triangle MicroWorks, Inc. DNP 3.0 Slave Source Code Library, Version 2.18.
  • Page 259 Reports time-tagged Binary Input Change Events no specific variation requested: when no specific variation requested: Never Never Only time-tagged for P721 and Binary Input Change With Time for P723 P721 and P723 Only non-time-tagged Binary Input Change With Relative Time...
  • Page 260 P72x/EN CT/A11 Communication database Page 70/78 MiCOM P721/P723 Implementation Table The following table identifies the variations, function codes, and qualifiers supported by the P72x in both request messages and in response messages. For static (non-change-event) objects, requests sent with qualifiers 00, 01, 06, 07, or 08, will be responded with qualifiers 00 or 01.
  • Page 261 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 71/78 REQUEST RESPONSE OBJECT (Library will parse) (Library will respond with) Object Variation Qualifier Function Qualifier Function Codes Description (dec) Number Number Codes (hex) Codes (dec) Codes (hex) (read) 00, 01 (start-stop) Frozen Counter (Variation 0 is...
  • Page 262 Request Function Codes supported: 1 (read) Static Variation reported when variation 0 requested: 1 (Binary Input without status) Change Event Variation reported when variation 0 requested: 2 (Binary Input Change with Time) for P721 and P723 P72x P721 P723 Change Event...
  • Page 263 Request Function Codes supported: 1 (read) Static Variation reported when variation 0 requested: 1 (Binary Input without status) Change Event Variation reported when variation 0 requested: 2 (Binary Input Change with Time) for P721 and P723 P72x P721 P723 Change Event...
  • Page 264 P72x/EN CT/A11 Communication database Page 74/78 MiCOM P721/P723 1.4.2 Binary Output Status Points and Control Relay Output Blocks The following table lists both the Binary Output Status Points (Object 10) and the Control Relay Output Blocks (Object 12). Binary Output Status points are not included in class 0 polls.
  • Page 265 When a freeze function is performed on a Binary Counter point, the frozen value is available in the corresponding Frozen Counter point. Binary Counters and Frozen Counters are not included in class 0 polls. P721 does not support binary Counters and Frozen Counters. Binary Counters Static (Steady-State) Object Number: 20...
  • Page 266 P72x/EN CT/A11 Communication database Page 76/78 MiCOM P721/P723 1.4.4 Analog Inputs The following table lists Analog Inputs (Object 30). It is important to note that 16-bit and 32-bit variations of Analog Inputs, Analog Output Control Blocks, and Analog Output Statuses are transmitted through DNP as signed numbers. Even for analog input points that are not valid as negative values, the maximum positive representation is 32767.
  • Page 267 Communication database P72x/EN CT/A11 MiCOM P721/P723 Page 77/78 Analog Inputs Static (Steady-State) Object Number: 30 Change Event Object Number: 32 Request Function Codes supported: 1 (read) Static Variation reported when variation 0 requested: 1 (32-Bit Analog Input) Change Event Variation reported when variation 0 requested: 1 (32-Bit Analog Change Event w/o...
  • Page 268 P72x/EN CT/A11 Communication database Page 78/78 MiCOM P721/P723 BLANK PAGE...
  • Page 269 Commissioning and Maintenance P72x/EN CM/C21 MiCOM P721/P723 COMMISSIONING AND MAINTENANCE GUIDE...
  • Page 271 Commissioning and Maintenance P72x/EN CM/C21 MiCOM P721/P723 Page 1/28 CONTENTS REQUIREMENTS PRIOR TO COMMISSIONING COMMISSIONING TEST ENVIRONMENT Important notes 2.1.1 Injection test sets 2.1.2 Additional commissioning test equipment 2.1.3 Communication Commissioning test sheets PRODUCT VERIFICATION TESTS Allocation of terminals Electrostatic discharge (ESD)
  • Page 272 P72x/EN CM/C21 Commissioning and Maintenance Page 2/28 MiCOM P721/P723 Phase bus wire supervision ([95] Phase Bus-Wire Sup) 4.5.1 Test wiring diagram 4.5.2 MiCOM settings 4.5.3 [95] Threshold I Sup with Fourier mode 4.5.4 [95] Threshold I Sup with Sample mode 4.5.5...

  • Page 273: Requirements Prior To Commissioning

    (static or electromechanical). To commission MiCOM relays, it is only necessary to verify that the hardware is functioning correctly and that the application-specific software settings have been applied to the MiCOM relay.

  • Page 274: Commissioning Test Environment

    MiCOM P721/P723 COMMISSIONING TEST ENVIRONMENT Important notes All commissioning tests of MiCOM P721 and P723 relays are carried out by injecting currents to the secondary of the earth and/or phase CTs using the appropriate injection test sets provided for this purpose.

  • Page 275: Product Verification Tests

    Commissioning and Maintenance P72x/EN CM/C21 MiCOM P721/P723 Page 5/28 PRODUCT VERIFICATION TESTS BEFORE CARRYING OUT ANY WORK ON THE EQUIPMENT, THE USER SHOULD BE FAMILIAR WITH THE CONTENTS OF THE SAFETY GUIDE SFTY/4LM/E11 OR LATER ISSUE, OR THE SAFETY AND TECHNICAL DATA SECTIONS OF THE TECHNICAL MANUAL AND ALSO THE RATINGS ON THE EQUIPMENT RATING LABEL.

  • Page 276: Auxiliary Supply

    This test checks that all the opto-isolated inputs are functioning correctly. The P723 relays have 5 opto-isolated inputs whereas the P721 relays have 2 opto-isolated inputs. The opto inputs should be energized one at a time. The status of the input can be viewed using the menu OP.

  • Page 277: Logic Outputs

    Logic outputs This test checks that all outputs are functioning correctly. The P723 has 8 outputs whereas the P721 has 4 outputs. The Watchdog normally-closed contact is in terminals 35-36 and the Watchdog normally- open contact is in terminals 35-37.

  • Page 278: Setting Check

    Transfer the setting file to the relay using a laptop PC running the appropriate software through the RS232 front port (all MiCOM P72x models) or the RS485 rear port (all MiCOM models). This method is preferred because it is much faster. If the setting software is not used, enter the settings manually using the relay front panel interface.

  • Page 279: Phase Differential Proteciton ([87] Threshold I Diff])

    Commissioning and Maintenance P72x/EN CM/C21 MiCOM P721/P723 Page 9/28 Phase differential proteciton ([87] Threshold I Diff]) Set the Trip [87] tDiff to the Trip Commands. Note that [87] tDiff is affected by the timer, any blocking logic, the bus wire supervision and the check zone. On the other hand, [87] Diff is instantaneous and it is not affected by any blocking logic, the bus wire supervision or the check zone.
  • Page 280 P72x/EN CM/C21 Commissioning and Maintenance Page 10/28 MiCOM P721/P723 FIGURE 2: I DIFF TESTS WIRING...

  • Page 281: Micom Settings

    Commissioning and Maintenance P72x/EN CM/C21 MiCOM P721/P723 Page 11/28 4.3.2 MiCOM settings 4.3.2.1 MiCOM P723 Settings Note that the setting cell Protection line select under Configuration/Connection should be set as Phase. Protection Menu [87] PHASE DIFF. PROTECTION [87] Phase diff. Prot.

  • Page 282: [87] Threshold I Diff With Sample Mode

    P72x/EN CM/C21 Commissioning and Maintenance Page 12/28 MiCOM P721/P723 4.3.4 [87] Threshold I Diff with Sample mode The sample mode compares the peak-to-peak value of the differential current divided by 2 × √2 against the [87] Threshold I Diff. Idiff −...

  • Page 283: Earth Differential Protection ([87N] Threshold I Diff)

    Commissioning and Maintenance P72x/EN CM/C21 MiCOM P721/P723 Page 13/28 Checks: Alarm message on the LCD. Alarm LED flashes. Trip LED on [87] tDiff LED on (if programmed). Trip output closes. [87] tDiff output closes (if programmed). [87] Fault Timer tdiff check: Apply a current onto phase A and measure the time delay [87] tDiff by presetting the current above the 2 ×...

  • Page 284: Micom Settings

    4.4.2.1 MiCOM P721 and P723 settings Protection Menu In the P723 setting file, the cell Description under Op Parameters can be set as either P721 or P723. If it is set as P723, then setting cell Protection line select under Configuration/Connection may be set as either [87N] Earth or [87] Phase.

  • Page 285: [87N] Threshold I Diff With Fourier Mode

    Commissioning and Maintenance P72x/EN CM/C21 MiCOM P721/P723 Page 15/28 4.4.3 [87N] Threshold I Diff with Fourier mode The Fourier mode is based on the differential current fundamental module. Idiff > [87] Threshold Diff , then the relay trips. Values to be recorded: [87N] Threshold I Diff Time delay tDiff>...

  • Page 286: [87N] Threshold I Diff With Fast Mode

    P72x/EN CM/C21 Commissioning and Maintenance Page 16/28 MiCOM P721/P723 [87N] tDiff LED on (if programmed). Trip output closes. [87N] tDiff output closes (if programmed). [87N] Fault Timer tdiff check: Apply a current onto the single phase CT input and measure the time delay [87N] tDiff by pre-setting the current above the [87N] Threshold I Diff (I injected >...

  • Page 287: [95] Threshold I Sup With Fourier Mode

    Commissioning and Maintenance P72x/EN CM/C21 MiCOM P721/P723 Page 17/28 Protection Menu [95] PHASE BUS-WIRE SUPERV [95] Phase Bus-Wire Sup [95] Threshold I Sup 2.00 In [95] Fault timer t Sup 3.00 s [95] Measurement Filter Fourier, Sample, Fast sample modes [95] Reset Timer tReset 0.00 s...

  • Page 288: 95] Threshold I Sup With Fast Mode

    P72x/EN CM/C21 Commissioning and Maintenance Page 18/28 MiCOM P721/P723 Values to be recorded: [95] Threshold I Sup for each phase Time delay tSup for each phase. [95] Threshold I Sup check: If the time delay [95] Fault Timer t Sup is short, gradually increase the injected current to [95] Threshold I Sup and verify that [95] Sup is asserted.

  • Page 289: Earth Bus Wire Supervision ([95N] Earth Bus-Wire Sup)

    This test is required when the P72x is used in a high impedance REF. Figure 7 shows the connections for the P721 and P723 when the relays are used in a high impedance differential scheme.
  • Page 290 P72x/EN CM/C21 Commissioning and Maintenance Page 20/28 MiCOM P721/P723 FIGURE 5: REF - PRIMARY INJECTION - STABILITY TEST SET UP During the stability test, it is necessary to measure the spill current in the relay circuit, therefore the stabilizing resistor should be shorted out. The current should be increased up to as near full load as possible and the current flowing through ammeter A1 noted.

  • Page 291: Busbar Primary Injection Tests

    Commissioning and Maintenance P72x/EN CM/C21 MiCOM P721/P723 Page 21/28 Busbar Primary Injection Tests First choose any of the CTs as the reference CT. The polarity and ratio of the reference CT should be checked first. Afterwards the polarity and ratio of the other CTs in the high impedance differential busbar scheme should be verified against the reference CT.
  • Page 292 P72x/EN CM/C21 Commissioning and Maintenance Page 22/28 MiCOM P721/P723 FIGURE 8: BUSBAR APPLICATION - PRIMARY INJECTION – POLARITY CHECK OF REFERENCE CT The current transformers of each other circuit should be checked against the reference CT. This is done by injecting primary current through the reference and each of the remaining circuits.

  • Page 293: Final Checks

    Commissioning and Maintenance P72x/EN CM/C21 MiCOM P721/P723 Page 23/28 measure the voltage across the P72x and the stabilizing resistor. The voltage reading should be noted when the P72x operates, and this voltage should be very close to the Vs (stability voltage). The sensitivity test should be performed for each discriminating zone and for the overall check zone.

  • Page 294: Maintenance

    5.1.1 Minor fault A communication failure is regarded by the MiCOM P721 and P723 relays as a minor fault. If the communication is at fault, the MiCOM P721 and P723 protection and automation modules are not affected. The MiCOM relay is fully operational. The watchdog relay is energized (35-36 contact open and 36-37 contact closed).

  • Page 295: Hardware And Software Faults

    To remove the complete relay (active part and case) the entire wiring must be removed from the rear connector. Before working at the rear of the relay, isolate all current supplies to the MiCOM relay and ensure that the relay is no longer powered.

  • Page 296: Problem Solving

    MiCOM relay no longer responds Problem: No response from MiCOM P721 and P723 relays when asked by the supervision software without any communication fault message. Cause: Mainly, this type of problem is linked to an error in the MiCOM P721 and P723 communication parameters.
  • Page 297 MiCOM P721/P723 Page 27/28 Action: Check MiCOM P721 and P723 communication parameters (data rate, parity, etc.) are in accordance with the supervision settings. Check MiCOM P721 and P723 network address. Check that this address is not used by another device connected on the same LAN.
  • Page 298 P72x/EN CM/C21 Commissioning and Maintenance Page 28/28 MiCOM P721/P723 BLANK PAGE...
  • Page 299 Connection Diagrams P72x/EN CO/A11 MiCOM P721/P723 CONNECTION DIAGRAMS...
  • Page 303 Commissioning Test & Record Sheets P72x/EN RS/A11 MiCOM P721/P723 COMMISSIONING TEST & RECORD SHEETS...
  • Page 305 Commissioning Test & Record Sheets P72x/EN RS/A11 MiCOM P721/P723 Page 1/22 CONTENTS COMMISSIONING TEST SHEETS Relay identification Commissioning test record COMMISSIONING SETTING RECORD SHEETS OP PARAMETERS Menu CONFIGURATION Menu 2.2.1 Connection menu 2.2.2 LEDs 5 to 8 configuration 2.2.3 Group select configuration 2.2.4...
  • Page 306 P72x/EN RS/A11 Commissioning Test & Record Sheets Page 2/22 MiCOM P721/P723 BLANK PAGE...

  • Page 307: Commissioning Test Sheets

    Commissioning date : Engineer : Substation : Circuit : Network nominal frequency: P721 P723 MiCOM Overcurrent relay model : Serial number : Rated current In : Auxiliary voltage Uaux : Communication protocol : Language : Commissioning test record (put a cross after each checked stage)
  • Page 308 P72x/EN RS/A11 Commissioning Test & Record Sheets Page 4/22 MiCOM P721/P723 Auxiliary supply control Auxiliary voltage to relay Auxiliary voltage value ________________ Vdc/Vac Watchdog contacts With auxiliary supply off Terminals 35 and 36 With auxiliary supply on Terminals 36 and 37...
  • Page 309 Commissioning Test & Record Sheets P72x/EN RS/A11 MiCOM P721/P723 Page 5/22 Earth protection test Theoretical value Relay value Threshold Earth Diff _______________ A I Diff Threshold I Diff drop Threshold Timer Fault Timer tdiff at 2*I Diff ______________ ms Fault Timer tdiff at 10*I Diff...

  • Page 310: Commissioning Setting Record Sheets

    P72x/EN RS/A11 Commissioning Test & Record Sheets Page 6/22 MiCOM P721/P723 COMMISSIONING SETTING RECORD SHEETS OP PARAMETERS Menu Password : Reference : Software version : Frequency : 50 Hz 60 Hz CONFIGURATION Menu 2.2.1 Connection menu Protection line select Earth...

  • Page 311: Leds 5 To 8 Configuration

    Commissioning Test & Record Sheets P72x/EN RS/A11 MiCOM P721/P723 Page 7/22 2.2.2 LEDs 5 to 8 configuration • = available with this model. LED 5 LED 6 LED 7 LED 8 Functions • [87] Diff • • [87N] Diff •...

  • Page 312: Alarms Configuration

    Reset Led on fault Alarm tAux1 Alarm tAux2 Alarm tAux3 (P723 only) Alarm tAux4 (P723 only) Alarm tAux5 (P723 only) 2.2.5 Inputs configuration Inputs (P721 only) Inputs (P723 only) Voltage input DC 2.2.6 Relays maintenance ← P721 → P723 ←...

  • Page 313: Communication Menu

    Commissioning Test & Record Sheets P72x/EN RS/A11 MiCOM P721/P723 Page 9/22 COMMUNICATION Menu NOTE: Menu content depends on the communication protocol. Communication ? Rear Comm. Address Baud Rate 300 bds 600 bds 1.200 bds 2.400 bds 4.800 bds 9.600 bds 19.200 bds...

  • Page 314: Protection G1 Menu

    P72x/EN RS/A11 Commissioning Test & Record Sheets Page 10/22 MiCOM P721/P723 PROTECTION G1 Menu 2.4.1 [87N] Earth differential protection [87N] Earth Diff protection? [87N] Threshold I diff= [87N] Threshold V diff= [87N] Flt Timer t Diff [87N] Flt Timer t Reset...

  • Page 315: Phase Bus-Wire Supervision (P723 Only)

    Commissioning Test & Record Sheets P72x/EN RS/A11 MiCOM P721/P723 Page 11/22 2.4.4 [95] Phase bus-wire supervision (P723 only) [95] Phase bus-wire sup? [95] Threshold I Sup= [95] Threshold V Sup= [95] Flt Timer t Sup [95] Flt Timer t Reset...

  • Page 316: Phase Differential Protection (P723 Only)

    P72x/EN RS/A11 Commissioning Test & Record Sheets Page 12/22 MiCOM P721/P723 2.5.3 [87] Phase differential protection (P723 only) [87] Phase Diff prot? [87] Threshold I diff= [87] Threshold V diff= [87] Flt Timer t Diff [87] Check zone? [87] Rst Timer t Reset...
  • Page 317 Commissioning Test & Record Sheets P72x/EN RS/A11 MiCOM P721/P723 Page 13/22 AUTOMAT.CTRL Menu 2.6.1 TRIP Command allocation P721 P723 Function Trip [87] tDiff Trip [87N] tDiff Trip tAux 1 Trip tAux 2 Trip tAux 3 Trip tAux 4 Control Trip...
  • Page 318 Function [87N] tDiff [87] tDiff tAux 1 tAux 2 tAux 3 tAux 4 2.6.5 OUTPUT RELAYS allocation ← P721 → ← P723 → RL2 RL3 RL4 RL5 RL6 RL7 RL8 Function Yes Yes Yes Yes Yes Yes • • [87N] Diff •...
  • Page 319 Commissioning Test & Record Sheets P72x/EN RS/A11 MiCOM P721/P723 Page 15/22 ← P721 → ← P723 → RL2 RL3 RL4 RL5 RL6 RL7 RL8 Function Yes Yes Yes Yes Yes • • CB Fail • • t Aux 1 •...

  • Page 320: Logic Input Allocation

    P72x/EN RS/A11 Commissioning Test & Record Sheets Page 16/22 MiCOM P721/P723 2.6.7 LOGIC INPUT allocation 2.6.7.1 Inputs Inputs Function • • Unlatch • • Aux 1 • • Aux 2 • Aux 3 • Aux 4 • • Block Logic 2 •...

  • Page 321: Logic Equations

    Commissioning Test & Record Sheets P72x/EN RS/A11 MiCOM P721/P723 Page 17/22 2.6.9 LOGIC EQUATIONS Equ. A Boolean Logic A.00 = NOT A.01 = OR NOT = AND NOT A.02 = OR NOT = AND NOT A.03 = OR NOT = AND NOT A.04...
  • Page 322 P72x/EN RS/A11 Commissioning Test & Record Sheets Page 18/22 MiCOM P721/P723 Equ. C Boolean Logic C.00 = NOT C.01 = OR NOT = AND NOT C.02 = OR NOT = AND NOT C.03 = OR NOT = AND NOT C.04...
  • Page 323 Commissioning Test & Record Sheets P72x/EN RS/A11 MiCOM P721/P723 Page 19/22 Equ. E Boolean Logic E.00 = NOT E.01 = OR NOT = AND NOT E.02 = OR NOT = AND NOT E.03 = OR NOT = AND NOT E.04...
  • Page 324 P72x/EN RS/A11 Commissioning Test & Record Sheets Page 20/22 MiCOM P721/P723 Equ. G Boolean Logic G.00 = NOT G.01 = OR NOT = AND NOT G.02 = OR NOT = AND NOT G.03 = OR NOT = AND NOT G.04...

  • Page 325: Recording Menu

    Commissioning Test & Record Sheets P72x/EN RS/A11 MiCOM P721/P723 Page 21/22 RECORDING Menu 2.7.1 FAULT RECORD Record Fault Record Fault Time Fault date Active Set Group Faulted phase None Phase A Phase B Phase C Earth Threshold Fault Magnitude IA Diff R.M.S IB Diff R.M.S...
  • Page 326 P72x/EN RS/A11 Commissioning Test & Record Sheets Page 22/22 MiCOM P721/P723 BLANK PAGE...
  • Page 327 Hardware/Software Version P72x/EN VC/C21 History and Compatibility MiCOM P721/P723 HARDWARE VERSION HISTORY AND COMPATIBILITY...
  • Page 329 Hardware/Software Version P72x/EN VC/C21 History and Compatibility MiCOM P721/P723 Page 1/4 CONTENTS MiCOM P721 MiCOM P723...
  • Page 330 P72x/EN VC/C21 Hardware/Software Version History and Compatibility Page 2/4 MiCOM P721/P723 BLANK PAGE...
  • Page 331 Software Date of Full Description of Changes Compati- Version Issue with previous bility hardware V11.B 03/2009 V11.B software the first software for the P721 hardware V2.14 HARD 5 (first issue) V3.0 V11.D 12/2011 New Schneider Electric Brand V3.4 HARD 5...
  • Page 332 P72x/EN VC/C21 Hardware/Software Version History and Compatibility Page 4/4 MiCOM P721/P723 MiCOM P723 Relay Type P723 Backward Compatibility Software Date of Full Description of Changes Compati- Version Issue with previous bility hardware V11.B 03/2009 V11.B software is the first software for the P723 V2.14...
  • Page 334 Customer Care Centre http://www.schneider-electric.com/CCC Schneider Electric 35 rue Joseph Monier 92506 Rueil-Malmaison FRANCE Phone: +33 (0) 1 41 29 70 00 Fax: +33 (0) 1 41 29 71 00 www.schneider-electric.com Publishing: Schneider Electric Publication: P72x/EN T/C21 10/2012...

Table of Contents