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Siemens Reyrolle 7SR46 Manual

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Reyrolle
7SR46 Device
V1.00
Manual
C53000-G7040-C103-1
Preface
Open Source Software
Table of Contents
Introduction
Device Functionality
Functions
Technical Data
Applications
Index
1
2
3
4
5

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Summary of Contents for Siemens Reyrolle 7SR46

  • Page 1 Preface Open Source Software Table of Contents Reyrolle Introduction 7SR46 Device Device Functionality Functions V1.00 Technical Data Manual Applications Index C53000-G7040-C103-1...
  • Page 2 Disclaimer of Liability Copyright Subject to changes and errors. The information given in Copyright © Siemens 2022. All rights reserved. this document only contains general descriptions and/or The disclosure, duplication, distribution and editing of this performance features which may not always specifically...

  • Page 3: Preface

    Preface Purpose of the Manual This manual provides an overview of the Reyrolle device family. It describes various functions (protection and supervision) used, device technical data, and device applications. Target Audience This manual is mainly intended for protection system engineers, commissioning engineers, persons entrusted with the setting, testing and maintenance of automation, selective protection and control equipment, and operational crew in electrical installations and power plants.
  • Page 4 (RoHS Direc- tive 2011/65/EU). This conformity has been proved by tests conducted by Siemens AG in accordance of the Council Directive in accordance with the product standard IEC/EN 60255-26 for the EMC directives, and with the standard IEC/EN 60255-27 for the low-voltage directive.
  • Page 5 The equipment (device, module) may be used only for such applications as set out in the catalogs and the technical description, and only in combination with third-party equipment recommended and approved by Siemens. Problem-free and safe operation of the product depends on the following: •...
  • Page 6 Preface When electrical equipment is operated, hazardous voltages are inevitably present in certain parts. If proper action is not taken, death, severe injury or property damage can result: • The equipment must be grounded at the grounding terminal before any connections are made. •...

  • Page 7: Open Source Software

    License Conditions provide for it you can order the source code of the Open Source Software from your Siemens sales contact – against payment of the shipping and handling charges – for a period of at least 3 years after purchase of the product. We are liable for the product including the Open Source Software contained in it pursuant to the license conditions applicable to the product.
  • Page 8 Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...

  • Page 9: Table Of Contents

    Table of Contents Preface................................3 Open Source Software..........................7 Introduction..............................11 7SR46 Overcurrent and Earth Fault Relay Overview............12 Ordering Options......................14 Device Functionality........................... 15 Front Fascia........................16 2.1.1 Overview........................16 2.1.2 Liquid Crystal Display....................16 2.1.3 Keypad........................17 2.1.4 Light Emitting Diode (LED)...................18 2.1.5 Local Flag........................
  • Page 10 Table of Contents 51N Time-Delayed Earth Fault – Derived................66 50LC/SOTF Switch onto Fault.................... 67 81HBL2 2 Harmonic Block/Inrush Restraint..............68 Applications..............................69 Overview ......................... 70 Specific CTs........................71 5.2.1 Overview........................71 Time-Delayed Overcurrent (51/51N) ................. 74 Overcurrent Characteristics....................76 5.4.1 Selection of Overcurrent Characteristics ..............76 5.4.2 Reset Delay .........................76 Instantaneous Overcurrent (50/50N) ................

  • Page 11: Introduction

    Introduction 7SR46 Overcurrent and Earth Fault Relay Overview Ordering Options Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...

  • Page 12: 7Sr46 Overcurrent And Earth Fault Relay Overview

    1.1 7SR46 Overcurrent and Earth Fault Relay Overview 7SR46 Overcurrent and Earth Fault Relay Overview The 7SR46 Argus dual powered non-directional overcurrent and earth fault relay is a member of the Siemens Reyrolle protection devices product family. The relay is developed using the latest generation of hardware technology.
  • Page 13 Introduction 1.1 7SR46 Overcurrent and Earth Fault Relay Overview Protection Functions • 50 Instantaneous overcurrent – phase • 50LC/SOTF Line check/Switch onto fault • 50N Instantaneous earth fault – derived • 51 Time-delayed overcurrent – phase • 51N Time-delayed earth fault – derived Supervision Functions •...

  • Page 14: Ordering Options

    Introduction 1.2 Ordering Options Ordering Options Ordering Information – 7SR46 Argus Product Description Order Number – 9 10 11 12 – 13 14 15 16 Dual Powered Non-Directional Overcur- □ – □ □ □ □ – □ rent and Earth Fault Relay with Specific CT Case I/O and Fascia Height 104 mm, molded case, 3 CT, 2 binary inputs, 2 binary outputs, 1 pulse output, 4 LEDs, 1 flag output, and 1 external trip input...

  • Page 15: Device Functionality

    Device Functionality Front Fascia Sensitivity Binary Inputs External Trip Input Binary Outputs Pulse Output Remote Flag Output Resetting of LEDs, Trip Flag Indication, and Binary Outputs Data Storage 2.10 Real Time Clock (RTC) Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...

  • Page 16: Front Fascia

    Device Functionality 2.1 Front Fascia Front Fascia Overview 2.1.1 The front fascia is part of the relay that is designed to provide a user-friendly method of entering the settings and retrieving data from the relay. You can access through the push-buttons and perform the setting changes. The front fascia contains 2 predefined LED indicators and a paper label for 2 user-programmable LEDs.

  • Page 17: Keypad

    Device Functionality 2.1 Front Fascia By using the LCD, you can view or edit a configuration parameter and view the following: • Real-time state of a relay such as BI, ETI, and BO • Battery profile • Auxiliary power status •...

  • Page 18: Light Emitting Diode (Led)

    Device Functionality 2.1 Front Fascia Keys Description This push-button is used to return the relay display to its initial status or one level up in the menu structure. Press CANCEL to return to the previous menu or to cancel the value. This push-button is used to reject any alterations to a setting while in the edit mode.
  • Page 19 Device Functionality 2.1 Front Fascia The user-programmable LEDs have default mapping as follows: • LED L2: 50-1 function and 51-1 function • LED L3: 50N-1 function and 51N-1 function This default configuration is printed as O/C and E/F respectively on one side of the paper label provided with the decal.

  • Page 20: Local Flag

    Device Functionality 2.1 Front Fascia Table 2-3 User-Programmable LED Operations Parameters Description LED Default Value L2 self reset or hand reset – (hand reset) L3 self reset or hand reset – (hand reset) If the LED is configured as Self Reset, then LED turns on when the function is active and turns off when func- tion resets.

  • Page 21: Sensitivity

    Device Functionality 2.2 Sensitivity Sensitivity The sensitivity of 7SR46 Argus Relay is 0.8 ⋅ I (minimum phase current) in 1-phase or 0.4 ⋅ I (minimum smin smin phase current) in 3-phase. This minimum phase current is necessary for the healthy functioning of the relay. The following graphs shows the sensitivity of the relay, In the absence of auxiliary power supply, the sensi- tivity of the relay is the minimum phase current required for the relay to energize, detect a fault, and trip as per the configuration.

  • Page 22: Binary Inputs

    Device Functionality 2.3 Binary Inputs Binary Inputs Overview The binary inputs (BI) are optocouplers operated from a suitably rated AC/DC power supply. There are 2 ordering options available based on the operating threshold of binary inputs. • Binary input with an operating threshold of 88 V. Works on both AC and DC voltage supply •...
  • Page 23 Device Functionality 2.3 Binary Inputs Parameters Description Default Value Min Step Change Inhibit 50N-2 50N-2 element block – – – Inhibit 51N-1 51N-1 element block – – – Inhibit 50LC 50LC/SOTF element block – – – Inhibit 81HBL2 Inrush current element –...

  • Page 24: External Trip Input

    Device Functionality 2.4 External Trip Input External Trip Input Overview The External Trip Input (ETI) is an electrically isolated contact. The ETI works only on Healthy CT current/auxil- iary power supply. The ETI is a scanning input which is OFF for 5 s and ON for 1 s. Any contact change during ON time is detected by the relay.
  • Page 25 Device Functionality 2.4 External Trip Input Parameters Description Default Value Min Step Change General Alarm-1 Display general alarm-1 – – – text General Alarm-2 Display general alarm-2 – – – text General Alarm-3 Display general alarm-3 – – – text NOTE When pulse output assigned to an external trip input operates and when the ▶...

  • Page 26: Binary Outputs

    Device Functionality 2.5 Binary Outputs Binary Outputs Overview The 7SR46 Argus relay provides 2 binary outputs which can be configured to send commands to the switch- gear units and indications for remote signaling of the important events and status. The binary output can be assigned to any available functions under OUTPUT CONFIG > OUTPUT MATRIX menu.
  • Page 27 Device Functionality 2.5 Binary Outputs Parameters Description Default Step Change Value 50LC 50LC/SOTF element – – – operate 81HBL2 Inrush element operate – – – Active Grp 1 Active Group 1 – – – Active Grp 2 Active Group 2 –...

  • Page 28: Pulse Output

    When there is no load connected at the output of pulse output (no trip coil is connected), the pulse on duration varies from 50 ms to 70 ms. The pulse output cannot be triggered via rear/front communication protocols. Siemens recommends using binary inputs for triggering the pulse output for remote trip applications.

  • Page 29: Remote Flag Output

    Device Functionality 2.7 Remote Flag Output Remote Flag Output The remote flag output is used to indicate the trip via an external flag. The remote flag output provides 24 V, 0.01 Ws pulses of 50 ms ON and 500 ms OFF. The remote flag output operates when any protection function trips.

  • Page 30: Resetting Of Leds, Trip Flag Indication, And Binary Outputs

    Device Functionality 2.8 Resetting of LEDs, Trip Flag Indication, and Binary Outputs Resetting of LEDs, Trip Flag Indication, and Binary Outputs Depending upon the binary output configurations set to operate the protection functions, the configured binary outputs, local and remote trip flag indications, trip and respective phase or earth LEDs operate and latch after the trip command is issued by the protection functions.
  • Page 31 Device Functionality 2.8 Resetting of LEDs, Trip Flag Indication, and Binary Outputs [sc_rstleds_bos, 1, en_US] Figure 2-7 Reset LEDs Outputs, Reydisp Software Input Matrix Reset using Reydisp Evolution When the relay is latched, LEDs can be reset by sending an appropriate command over the data communica- tion channels using Reydisp Evolution software.
  • Page 32 Device Functionality 2.8 Resetting of LEDs, Trip Flag Indication, and Binary Outputs [sc_resetflags, 1, en_US] Figure 2-8 Reset Flags Reset using ▶ key (TEST/RESET key) From the Relay Identifier screen, reset the LEDs and outputs by pressing the ▶ key (TEST/RESET key). Reset through Rear Communication Protocol The resetting of LEDs and BOs is possible via the rear communication protocol like Modbus RTU and IEC 60870-5-103.

  • Page 33: Data Storage

    Device Functionality 2.9 Data Storage Data Storage The relay stores 2 types of data: Fault records and Event records. Data records are stored in the non-volatile memory. The Data Storage menu contains the settings for clearing events and faults. Fault Records (Trip Log) When the protection function detects a fault condition, a trip alert message appears on the LCD and fault records are generated.

  • Page 34: Real Time Clock (Rtc)

    Device Functionality 2.10 Real Time Clock (RTC) 2.10 Real Time Clock (RTC) The time and date can be set either via the relay fascia using appropriate commands in the SYSTEM CONFIG menu or using the Reydisp Evolution software. When the relay is de-energized, the battery maintains the time and date.

  • Page 35: Functions

    Functions Functions Available in 7SR46 Argus Relay 50 Instantaneous Overcurrent - Phase 50N Instantaneous Earth Fault – Derived 51 Time-Delayed Overcurrent – Phase 51N Time-Delayed Earth Fault – Derived 50LC/SOTF Switch onto Fault Protection 2nd Harmonic Block/Inrush Restraint (81HBL2) Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...

  • Page 36: Functions Available In 7Sr46 Argus Relay

    Functions 3.1 Functions Available in 7SR46 Argus Relay Functions Available in 7SR46 Argus Relay This section describes the functions available in 7SR46 Argus Relay. The relay provides protection functions and supervision functions as described: Protection Functions • 50 Instantaneous overcurrent - phase •...

  • Page 37: 50 Instantaneous Overcurrent - Phase

    Functions 3.2 50 Instantaneous Overcurrent - Phase 50 Instantaneous Overcurrent - Phase Overview of the Function (50) The instantaneous overcurrent protection is used to provide: • Short-circuit detection in electric equipment • High-speed highset overcurrent protection • Coordinated operation with other devices using current and time-graded settings Structure of the Function (50) The instantaneous overcurrent protection function element has group-dependent settings.
  • Page 38 Functions 3.2 50 Instantaneous Overcurrent - Phase Logic of the Function (50-n) [lo_7sr46_InstantaneousOvercurrentFn, 1, en_US] Figure 3-1 Logic Diagram of the Instantaneous Overcurrent Protection (50) Application and Settings Notes Gn 50-n Element Default setting: Disabled This setting is used to allow the element to be switched on and off based on the user requirement. An indi- vidual setting is provided for each element.
  • Page 39 Functions 3.2 50 Instantaneous Overcurrent - Phase NOTE If the device is in self-powered mode, the recommended setting will begin with 0.5 ⋅ I Gn 50-n Delay Default setting = 0.00 s This setting is set to suit the individual application. Gn 50-n Inrush Action Default setting = Off High levels of inrush currents into reactive components, for example transformers;...
  • Page 40 Functions 3.2 50 Instantaneous Overcurrent - Phase Information List Input/Output Matrix User Logic Type IEC 103 Modbus RTU Inhibit 50-n Inhibit 50-n Input – – 50-n 50-n Output Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...

  • Page 41: Instantaneous Earth Fault - Derived

    Functions 3.3 50N Instantaneous Earth Fault – Derived 50N Instantaneous Earth Fault – Derived Overview of the Function (50N) The Instantaneous derived earth fault protection is used to provide: • Short-circuit detection in electrical equipment • High-speed protection where appropriate to its location in the power system network and/or network impedances •...
  • Page 42 Functions 3.3 50N Instantaneous Earth Fault – Derived This setting is used to allow the element to be switched on and off if it is not required. An individual setting is provided for each element. This setting can be used to select the number of elements required. Parameter State Description The element is inactive.
  • Page 43 Functions 3.3 50N Instantaneous Earth Fault – Derived Gn 50N-n Setting 0.2 ⋅ I to 20.0 ⋅ I 1.0 ⋅ I – – Δ 0.01 ⋅ I from 0.2 ⋅ I 4.0 ⋅ I Δ 0.5 ⋅ I from 4.0 ⋅ I 20.0 ⋅...

  • Page 44: 51 Time-Delayed Overcurrent - Phase

    Functions 3.4 51 Time-Delayed Overcurrent – Phase 51 Time-Delayed Overcurrent – Phase Overview of the Function (51) Time-delayed overcurrent protection is used to provide: • Short-circuit detection in electric equipment • Coordinated operation with other devices using current and time-graded settings Structure of the Function (51) The time-delayed overcurrent protection function element has group-dependent settings.
  • Page 45 Functions 3.4 51 Time-Delayed Overcurrent – Phase Logic of the Function (51-n) [lo_7sr46_TimeDelayedOvercurrentFn, 1, en_US] Figure 3-3 Logic Diagram of the Time-Delayed Overcurrent Protection (51) The following characteristic curves are supported by 51-n: • • IEC-NI • IEC-VI • IEC-EI •...
  • Page 46 Functions 3.4 51 Time-Delayed Overcurrent – Phase Operating time for IEC Operating time for IEEE/ANSI Reset time for IEC/IEEE/ANSI Table 3-1 Constants for Operating-Curve and Reset-Curve Characteristics Operating Curve Reset Curve Curve Type α IEC-NI 0.14 0.02 – – – IEC-VI 13.5 –...
  • Page 47 Functions 3.4 51 Time-Delayed Overcurrent – Phase This setting defines the characteristic of the inverse curve. Standard ANSI and IEC curves are provided. The characteristic can also be set as DTL. This increases the number of DTL elements that are available if more are required.
  • Page 48 Functions 3.4 51 Time-Delayed Overcurrent – Phase The reset parameter is used to define whether the element pickup resets to 0 instantaneously when the current falls below the setting or a reset curve characteristic or fixed DTL is applied. This operation is signifi- cant during intermittent faults where an induction disc device would be partially rotated when the fault current is reapplied.
  • Page 49 Functions 3.4 51 Time-Delayed Overcurrent – Phase Gn 51-n Setting 0.2 ⋅ I to 2.5 ⋅ I 1.0 ⋅ I – – Δ 0.01 ⋅ I Gn 51-n Char IEC-NI – – IEC-NI IEC-VI IEC-EI IEC-LTI ANSI-EI ANSI-MI ANSI-VI Gn 51-n Time Mult 0.01 to 10.00 1.00 –...

  • Page 50: Time-Delayed Earth Fault - Derived

    Functions 3.5 51N Time-Delayed Earth Fault – Derived 51N Time-Delayed Earth Fault – Derived Overview of the Function (51N) The time-delayed earth fault protection is used to provide: • Detection of earth current in electrical equipment • Backup or emergency protection in addition to other protection functions or devices •...
  • Page 51 Functions 3.5 51N Time-Delayed Earth Fault – Derived The following characteristic curves are supported by 51N-n: • • IEC-NI • IEC-VI • IEC-EI • IEC-LTI • ANSI-MI • ANSI-VI • ANSI-EI Operating time for IEC Operating time for IEEE/ANSI Reset time for IEC/IEEE/ANSI Table 3-2 Constants for Operating-Curve and Reset-Curve Characteristics Operating Curve...
  • Page 52 Functions 3.5 51N Time-Delayed Earth Fault – Derived Gn 51N-n Setting Default setting: 0.50 ⋅ I This setting defines the operating current threshold of the element. The applied phase current must exceed this setting by a factor of 1.10x for pickup of the element. The operation timing will then be dependent on the selected characteristic for the element setting.
  • Page 53 Functions 3.5 51N Time-Delayed Earth Fault – Derived Gn 51N-n Follower DTL Default setting: 0.00 s This setting allows an additional time to be added to that achieved by the selected characteristic curve. It is applied as a DTL time after the operate state from the curve is achieved. With this setting, the whole curve is shifted linearly on the time axis by this additional definite time.
  • Page 54 Functions 3.5 51N Time-Delayed Earth Fault – Derived Settings Menu CONFIGURATION > FUNCTION CONFIG Parameter Setting Options Settings Default Gn Derived E/F Disabled Disabled – – Enabled CONFIGURATION > CURRENT PROT'N > DERIVED E/F > 51N-n Parameter Setting Options Settings Default Gn 51N-n Element Disabled...

  • Page 55: 50Lc/Sotf Switch Onto Fault Protection

    Functions 3.6 50LC/SOTF Switch onto Fault Protection 50LC/SOTF Switch onto Fault Protection Overview of the Function (50LC/SOTF) The instantaneous tripping at Switch onto Fault (SOTF) function serves for immediate tripping when switching onto a fault. • Detects phase faults in the electrical power system immediately after energization •...
  • Page 56 Functions 3.6 50LC/SOTF Switch onto Fault Protection Logic of the Function (50LC/SOTF) [lo_7sr46_SwitchOnToFaultFn, 1, en_US] Figure 3-7 Logic Diagram of Switch onto Fault Protection (50LC/SOTF) The following graphs show the SOTF operating time for the CT power only. [dw_sotf_operating-time_Bo, 1, en_US] Figure 3-8 Operating Time for Switch onto Fault with 3-Phase and 1-Phase with Binary Output and Pulse Output...
  • Page 57 Functions 3.6 50LC/SOTF Switch onto Fault Protection Application and Settings Notes Gn 50LC/SOTF Default setting: Disabled This setting is used to allow the element to be switched on and off if it is not required. A separate setting is provided for each element. This setting can be used to select the number of elements required. Parameter State Description The element is inactive.

  • Page 58: 2Nd Harmonic Block/Inrush Restraint (81Hbl2)

    Functions 3.7 2nd Harmonic Block/Inrush Restraint (81HBL2) 2nd Harmonic Block/Inrush Restraint (81HBL2) Overview of the Function (81HBL2) The inrush-current detection is used to: • Recognize an inrush process on transformers and other inductive loads • Generate a blocking signal for protection functions when transformers are switched on •...
  • Page 59 Functions 3.7 2nd Harmonic Block/Inrush Restraint (81HBL2) Pickup ratio (I = I This setting defines the operating threshold of the element. The ratio of the 2nd harmonic component of current compared to the fundamental component of current is exceeded. This setting must be set to the default value unless in-service experience produces incorrect operation. 81HBL2 Release Block Default setting: 1.0 ⋅...
  • Page 60 Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...

  • Page 61: Technical Data

    Technical Data General Device Data 50 Instantaneous Overcurrent - Phase 50N Instantaneous Earth Fault – Derived 51 Time-Delayed Overcurrent - Phase 51N Time-Delayed Earth Fault – Derived 50LC/SOTF Switch onto Fault 81HBL2 2 Harmonic Block/Inrush Restraint Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...

  • Page 62: General Device Data

    Technical Data 4.1 General Device Data General Device Data Technical Data Overview Product family Non-directional dual powered overcurrent and earth-fault relay with specific CT Case and LEDs Non draw-out polycarbonate case, 2 non-programmable LEDs & 2 user-programmable LEDs Measuring inputs (current) 0.075 A (secondary) 50 Hz/60 Hz Auxiliary voltage...

  • Page 63: 50 Instantaneous Overcurrent - Phase

    Technical Data 4.2 50 Instantaneous Overcurrent - Phase 50 Instantaneous Overcurrent - Phase Table 4-1 Reference Operation Non-directional Elements Phase fault Setting range I 0.2 ⋅ I to 20.0 ⋅ I Time delay 0 s to 600 s Table 4-2 Operate and Reset Level Operate level I 100 % I...

  • Page 64: Instantaneous Earth Fault - Derived

    Technical Data 4.3 50N Instantaneous Earth Fault – Derived 50N Instantaneous Earth Fault – Derived Table 4-4 Reference Operation Non-directional Elements Derived earth fault Setting range I 0.2 ⋅ I to 20.0 ⋅ I Time delay 0 s to 600 s Table 4-5 Operate and Reset Level Operate level I...

  • Page 65: 51 Time-Delayed Overcurrent - Phase

    Technical Data 4.4 51 Time-Delayed Overcurrent - Phase 51 Time-Delayed Overcurrent - Phase Table 4-7 Reference Operation Non-directional Elements Phase fault Setting range I 0.2 ⋅ I to 2.5 ⋅ I Time multiplier 0.01 to 10 Time delay (DTL) 0.00 s to 15 s Table 4-8 Operate and Reset Level Operate level...

  • Page 66: Time-Delayed Earth Fault - Derived

    Technical Data 4.5 51N Time-Delayed Earth Fault – Derived 51N Time-Delayed Earth Fault – Derived Table 4-10 Reference Operation Non-directional Elements Derived earth fault Setting range I 0.2 ⋅ I to 2.5 ⋅ I Time multiplier 0.01 to 10 Time delay (DTL) 0.00 s to 15 s Operate level 110% I...

  • Page 67: 50Lc/Sotf Switch Onto Fault

    Technical Data 4.6 50LC/SOTF Switch onto Fault 50LC/SOTF Switch onto Fault Operate level 100 % I Setting range 1⋅ I to 20 ⋅ I Operating time Refer to Figure 3-8 for more information on operating time. Inhibited by Binary input or inrush current detector Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...

  • Page 68: 81Hbl2 2 Nd Harmonic Block/Inrush Restraint

    Technical Data 4.7 81HBL2 2 Harmonic Block/Inrush Restraint 81HBL2 2 Harmonic Block/Inrush Restraint 0.10 ⋅ I to 0.50 ⋅ I 81HBL2 Inrush setting (ratio of 2 harmonic current to fundamental component current) Where I = I 81HBL2 Inrush release block 0.30 ⋅...

  • Page 69: Applications

    Applications Overview Specific CTs Time-Delayed Overcurrent (51/51N) Overcurrent Characteristics Instantaneous Overcurrent (50/50N) Inrush Detector (81HBL2) Connection Examples Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...

  • Page 70: Overview

    Applications 5.1 Overview Overview 7SR46 dual powered relay is a non-directional overcurrent and earth-fault protection relay primarily intended for secondary distribution in electrical networks. The 7SR46 Argus relay is designed to operate with/without an auxiliary power supply. The relay is powered primarily from the auxiliary voltage even though all other power sources are available.

  • Page 71: Specific Cts

    Applications 5.2 Specific CTs Specific CTs Overview 5.2.1 The 7SR46 Argus relay is compatible with 6 specific CT 5P80 types giving a high range of operation. Depending on the CT selected, the relay supports the following I range (rated primary current): Table 5-1 Specific CT Range CT Type...
  • Page 72 Applications 5.2 Specific CTs Connections In distribution networks, 1 current transformer is required per phase A, B, C. A total of 3 transformers are needed. The following diagram is a generic representation of a specfic CT wiring diagram where the connecting terminals are showed.
  • Page 73 Applications 5.2 Specific CTs measurement, 2 terminals (S2 and S1) for secondary current measurement and power supply for the relay and 2 terminals (D and C) to perform the testing. The testing consists on the injection of 0.288 A in these last terminals providing a simulated primary current value.

  • Page 74: Time-Delayed Overcurrent (51/51N)

    Applications 5.3 Time-Delayed Overcurrent (51/51N) Time-Delayed Overcurrent (51/51N) The time-delayed overcurrent characteristic element provides several time/current operate characteristics. The element can be defined as either an Inverse Definite Minimum Time Lag (IDMTL) or Definite Time Lag (DTL) characteristic. If an IDMTL characteristic is required, then IEC, ANSI/IEEE curves are supported. The IDMTL characteristics are defined as Inverse because the tripping times are inversely proportional to the fault current being measured.
  • Page 75 Applications 5.3 Time-Delayed Overcurrent (51/51N) [dw_IEC-NI-curve_with_min-op-time-setting-appl, 1, en_US] Figure 5-3 IEC NI Curve with Minimum Operate Time Setting Applied To increase sensitivity, dedicated ground fault elements are used. There must be a little or no current flowing to earth in a healthy system, so that relays can give far lower pickup levels than relays which detect excess current (>...

  • Page 76: Overcurrent Characteristics

    ANSI operate characteristic is applied. Alternatively, a DTL reset (0 s to 60 s) can be used with other operating characteristics. For protection of cable feeders, Siemens recommends using 60 s DTL reset. On overhead line networks, particularly where circuit breaker with automatic reclosing functions are incorpo-...

  • Page 77: Instantaneous Overcurrent (50/50N)

    Applications 5.5 Instantaneous Overcurrent (50/50N) Instantaneous Overcurrent (50/50N) Each instantaneous element has an independent setting for pickup current and a follower definite time lag (DTL) which can be used to provide time grading margins, sequence coordination grading, or scheme logic. The instantaneous description relates to the pickup of the element rather than its operation.

  • Page 78: Inrush Detector (81Hbl2)

    Applications 5.6 Inrush Detector (81HBL2) Inrush Detector (81HBL2) The inrush detector (81HBL2) element detects the presence of high levels of 2 harmonic current, which indi- cates a transformer inrush current during switch-on. The inrush current raises above the operate level of the overcurrent elements for a short duration.

  • Page 79: Connection Examples

    Applications 5.7 Connection Examples Connection Examples Connection Examples for RMU Application 5.7.1 Figure 5-5 shows CT circuits connected to specific CT of 7SR46 Argus relay. [dw_argus-relay_RMU-application, 1, en_US] Figure 5-5 7SR46 Argus Relay for RMU Application The application shows the use of 50/51/50N/51N/50LC protection functions. The remote trip via communica- tion (through BO with auxiliary input present) and binary input is possible.

  • Page 80: Connection Examples For Distribution Transformer Application

    Applications 5.7 Connection Examples [dw_-relay_RMU-application2, 1, en_US] Figure 5-6 7SR46 Self-Powered Relay for RMU Application The application shows the use of 50/51/50N/51N/50LC protection functions. The remote trip via communica- tion (through BO with auxiliary input present) and binary input is possible. Connection Examples for Distribution Transformer Application 5.7.2 Figure 5-7...
  • Page 81 Applications 5.7 Connection Examples [dw_self-powered-relay_distribution_transf-appl, 1, en_US] Figure 5-7 7SR46 Self-Powered Relay for Distribution Transformer Application The application shows the use of 50/51/50N/51N/50LC protection functions. The remote trip via external trip input interfaced wth buchholz relay is possible. Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...
  • Page 82 Applications 5.7 Connection Examples [dw_argus-relay_distribution_transf-appl2, 1, en_US] Figure 5-8 7SR46 Argus Relay for Distribution Transformer Application The application shows the use of 50/51/50N/51N/50LC protection functions. The remote trip via binary input is possible. Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...

  • Page 83: Index

    Index 1,2,3 ... 2nd harmonic block/inrush restraint (81HBL2) 58 LED functions 18 50 Instantaneous Overcurrent - Phase 37 LED indication 18 50N Instantaneous earth fault 41 Light Emitting Diode (LED) 18 51 Time-Delayed Overcurrent – Phase 44 Liquid crystal display 16 51N Time-Delayed Earth Fault 50 Local Flag 20 Low battery LED 18...
  • Page 84 Index Time delayed overcurrent (51/51N) 74 Trip flag indication 30 Reyrolle, 7SR46 Device, Manual C53000-G7040-C103-1, Edition 10.2022...

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