LARSEN & TOUBRO LIMITED, MYSORE WORKS ER300P-PRIDE Manual

Electronic trivector meter

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Electronic Trivector Meter

ER300P-PRIDE

Class 0.2S

For

Neyveli

Lignite

Corporation

LARSEN & TOUBRO LIMITED, MYSORE WORKS

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Summary of Contents for LARSEN & TOUBRO LIMITED, MYSORE WORKS ER300P-PRIDE

Page 1 Electronic Trivector Meter ER300P-PRIDE Class 0.2S Neyveli Lignite Corporation LARSEN & TOUBRO LIMITED, MYSORE WORKS...
Page 2 Theory of Operation 2.1.1 Analog section 2.1.2 Digital processing section 2.1.3 Power supply section Hardware 2.2.1 Compact 2.2.2 Efficient 2.2.3 Ruggedness and Safety 2.2.4 Features 2.2.5 Data Safety Software 2.3.1 Definitions 2.3.2 Load survey records 2.3.3 Instantaneous Parameters. 2.3.4 Programmable features 2.3.4.1 External CT/PT ratios 2.3.4.2...
Page 3 APPENDIX A Fig 1. Parts/Dimensions Fig 2 3 Ph 4W connection diagram - with CT Fig 3 3 Ph 4W connection diagram - with CT & PT Fig 4 RS 485 connection diagram (top view) Fig 5 RS 485 connection diagram (front view) APPENDIX B - Technical specifications APPENDIX C - MODBUS details and memory map APPENDIX D –...
Page 4 failure and CT open are also indicated instantaneously. • 15 minutes Load Survey recorders for 40 days 1. Forward Wh 2. Reverse Wh 3. Forward VArh 4. Reverse VArh and Tampers are recorded. • Meter configuration/data collection possible through RS485 port using MODBUS protocol. Optically isolated serial interface using DCD.
Page 5 High precision current transformers and voltage transducers step down input currents and voltages, that are fed to an Analog to Digital converter 2.1.2. DIGITAL PROCESSING SECTION A powerful microprocessor controls the analog and digital sections. The digital samples are processed to obtain various metering data that is stored in non-volatile memory.
Page 6 meters that use LED displays. 2.2.3. Ruggedness and safety All components used the meter are of extended temperature range, which makes the meter ideal for tropical climates. The meter’s top and bottom covers are made of polycarbonate, which is a good insulator. The meter is safe for the user. The meter’s casing and terminal block have been made of non- flammable plastic material.
Page 7 RTC with battery backup is used for time keeping. It has a calendar of 100years. Watch dog timer is used to monitor the processing • activities that ensures the reliable operation of the meter. Power down sensor senses power failure and shuts •...
Page 8 Method of energy computation: All energies are of fundamental component only. Following method adopted forward/reverse energy calculations - Forward Wh: (W1 + W2) Reverse Wh: (W3 + W4) Forward VArh: (R1 + R4) Reverse VArh: (R2 + R3) Where W1, W2, W3 & W4 are the absolute active energies & R1, R2, R3 &...
Page 9 minutes time blocks will be contracted by ten seconds each. • Retard RTC command: When Retard RTC command is given, six consequent 15 minutes time blocks shall be elongated by ten seconds each. 2.3.2. LOAD SURVEY RECORDERS All energies, voltages and currents are of fundamental component only.
Page 10 Phase voltages. c> Phase currents. d> Active Power. e> Reactive Power. f> Apparent Power. g> Total Power Factor. h> Average Frequency. i> Tamper Status. Format: Bit nos. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 x x x x x s r a x e t c v where v = voltage failure (immediate status)
Page 11 2.3.4.2. RTC SETTING RTC setting For RS485, PC software can have password protection. Password protection on meter for DCD. No hardware protection. a> SYNC RTC time setting (absolute RTC command) b> Advance RTC command Contracts six consecutive 15 minutes. Time blocks by 10secs each.
Page 12 Each meter is given a unique number at factory. 2.3.4.5. ACCURACY METHODS: • Pulse method - PULSES/Wh: 10 for 5A meter 50 for 1A meter PULSES/VArh: 10 for 5A meter 50 for 1A meter • Accuracy check using DCD (MRI) - Energies are in Watt-hours.
Page 13 iii. kW “ xx.xxxx ” “Pr kW ” iv. kVAr “ xx.xxxx ” “Pr kVAr ” v. kVA “ xx.xxxx ” “Pr kVA ” vi. R phase Line voltage “ xxx.xx ” “L1 V ” vii. Y phase Line voltage “...
Page 14 kVArh “-- ← xx. Cumulative reverse ” kVArh “ xxx.xxxx ” “C kVArh” xxi. Final reading of forward Wh (00:00hr reading of present day) “ → + ” “ xxxx.xxxx ” “P1 kWh” xxii. Initial reading of forward Wh (00:00hr reading of previous day) “→...
Page 15 2.3.5 COMMUNICATION • RS485 port with MODBUS Protocol. From this port Data (Load survey and instantaneous) can be collected, and Parameters can be configured. Refer to Annexure C for details. • Optically Isolated serial interface port confirming to IEC 1107 Protocol. Through this port, Parameter setting/ Data collection (Only Load survey) is possible.
Page 16 Re-packing If the meter has to be returned to the supplier, repack the unit in the packing in which it was supplied. Optimum Field Conditions For the reliability and better life of the product the unit has to be operated at moderate temperatures and humidity. The meter is designed to work from -5 to 60 deg C and humidity of 95% RH non-condensing.
Page 17 Hence it DOES NOT HAVE ANY EARTH TERMINAL . For the WIRING connections the terminal block has been provided with 8 terminals. The WIRING connections are to be done as shown in the Appendix A. Terminal cover is to be used to protect the meter terminals from being tampered with.
Page 18 3 phase wire system V olt V Curr kVArH Class 0.5 Freq. 50Hz Pulse Rate /Unit Property of Sl.No. BAT T Manu factured by LARSEN & TOUBRO LI MITED , MYSO RE, INDIA...
Page 19 3PHASE 4 WIRE WIRE CONNECTION DIAGRAM WITH CT Fig. 2 a a a a b b b B B B A A A 3PHASE 4 WIRE WIRE CONNECTION DIAGRAM WITH CT & PT...
Page 20 Screws RS 485 connection diagram (Top View) Fig 4 Tx - Tx + 1 2 3 4 5 RS 485 connection diagram (Front View) Fig 5...
Page 21 Current (In) 5A or 1A (to 150%) Power Factor 4 quadrant operation Frequency 50 Hz +10% Electromagnetic compatibility IEC 687 Case material Plastic moulded with transparent cover. Protected to IEC 687 Insulation properties HV & insulation resistance as per IEC 687 Temperature c to 60 c for operation...
Page 23 1.1) Interface Standard: The configuration details to communicate with the meter are given below- Standard RS485 (half duplex) Baud rate Selectable- 9600, 4800, 2400,1200,600 or 300 bps Parity Selectable- None, odd or even Start bit Stop bit 1.2) Protocol: The RS485 interface uses MODBUS Protocol in RTU mode. Communicating with the meter involves sending commands to the meter for reading and writing the particular register.
Page 24 8 BITS 8 BITS N * 8 BITS 16 BITS 2.2) Address field: The meter can be addressed with specific user defined address from 1-255. Each slave must be assigned a unique address and only the addressed slave responds to query that contains its address.
Page 25 slave in response to a query. 2.5) Error Check Field: This allows the master and slave device to check a message for error transmission. The error check field uses a CRC-16 check in the RTU mode. 2.6) Data Addresses in Modbus Messages: All data addresses in Modbus messages are referenced to zero.
Page 26 addressed slave location. The value referenced in ILLEGAL DATA the data field is not VALUE allowable addressed slave location. Example: Query Message SLAVE L.O. H.O NO. L.O NO. ERROR ERROR ADDR START START OF REG OF REG CHECK CHECK ADDR ADDR FIELD FIELD...
Page 27 The addressing allows up to Max.90 registers to be obtained at each request. Broadcast mode is not allowed. The below example reads registers of R phase voltage from slave number 24(decimal). Since CT Primary is stored in the address 40001 and 40002 so to read CT Primary voltage both addresses should be read simultaneously.
Page 28 contents of holding register in the addressed slave. The addressing allows up to Max.90 registers to be obtained at each request. Broadcast mode is not allowed. The below example reads registers of Forward Active Cumulative energy from slave number 19(decimal). Since Forward Active Cumulative energy is stored in the address 30023 and 30024 so to read Forward Active Cumulative energy both addresses should be read simultaneously.
Page 29 will be 24038.So to get the Forward Active Cumulative energy this particular value should be multiplied with the specified multiplication factor (MF) which is 0.1 in this case (For further details see the memory map of the parameters). So 24038 x 0.1=2403.8Wh which is Forward Active Cumulative energy.
Page 30 If the value is an illegal value then the response message will be an exception response (Error message). For the details of maximum and minimum values of any parameter refer to manual. NOTE: For programming RTC the values the data for setting the RTC should be BCD (Binary Coded Decimal).
Page 31 This example will set the PT primary and PT secondary value in slave number 17.The address of PT primary is 40005,PT secondary is 40007 and value to be programmed for PT primary and PT secondary is 50,000 and 1,000 respectively. Query Message L.O.
Page 32 Multipl Multipl Address Parameters Words y PT y CT ratio ratio INSTANTANEOUS PARAMETERS Read Only Parameters (Function Code 4) 30001 0.01 R Line Voltage (unsigned integer) 30002 Y Line Voltage (unsigned integer) 0.01 30003 B Line Voltage (unsigned integer) 0.01 30004 R Phase Voltage (unsigned integer) 0.01...
Page 33 Current Time: Format: Hour, Minute 30021 (BCD, BCD) Current Time: Format: Second, dummy 30022 (BCD, -) Cumulative energy - forward Wh (unsigned 30023 long) Cumulative energy - reverse Wh (unsigned 30025 long) Cumulative energy - forward VArh (unsigned 30027 long) Cumulative energy - reverse VArh (unsigned 30029 long)
Page 34 Whe (Reverse Wh) unsigned integer 0.01 Rhi (Forward VAr) unsigned integer 0.01 Rhe (Reverse VAr) unsigned integer 0.01 Af (Average frequency) unsigned integer 0.001 Av (Average Voltage) unsigned integer 0.01 Ta (Tamper bits) unsigned long Bit nos. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 x x x x x x s r a p e t c v where...
Page 35 N 1 for latest but one 15 mins block. …… N=3839 for the oldest 15mins block (40 days back) 30201+N Current Time: Format: Year Month (BCD, BCD) Current Time: Format: Date Day (BCD, BCD) Current Time: Format: Hour, Minute (BCD, BCD) Current Time: Format: Second, dummy (BCD, -) Load survey –...
Page 36 (BCD, BCD) Current Time: Format: Date Day (BCD, BCD) Current Time: Format: Hour, Minute (BCD, BCD) Current Time: Format: Second, dummy (BCD, -) Load survey – cumulative energies at latest 00:00hr Format: Whi Whe Rhi Rhe where - Whi (Forward Wh) unsigned long Whe (Reverse Wh) unsigned long Rhi (Forward VArh) unsigned long Rhe (Reverse VArh) unsigned long...
Page 37 40001 CT Primary 40003 CT Secondary 40005 PT Primary 40007 PT Secondary Read (Function code 3)&write parameters (Function code 6 / 16) Real time clock (RTC) 40009 Meter id (1 to 255) Baud (unsigned integer) 40010 1=300, 2=600, 3=1200, 4=2400, 5=4800, 6=9600 Parity (unsigned integer) 40011...
Page 39 customer thereof gives satisfactory proof to L&T within the Warranty period. 1. L&T’s shall provide repairs and maintenance service for all equipment sold/or distributed by L&T, and products which cannot be repaired by L&T will be returned, subject to L&T's prior consent for free repairs.