Siemens Reyrolle 7SR45 Argus Device Manual
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Siemens Reyrolle 7SR45 Argus Device Manual

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Reyrolle
7SR45
V03.00
Device Manual
C53000-G7040-C101-2
Preface
Open Source Software
Table of Contents
Introduction
Device Functionality
Functions
Technical Data
Applications
Functional Tests
Appendix
Index
1
2
3
4
5
6
A

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Summary of Contents for Siemens Reyrolle 7SR45 Argus

  • Page 1 Preface Open Source Software Table of Contents Reyrolle Introduction 7SR45 Device Functionality Functions V03.00 Technical Data Device Manual Applications Functional Tests Appendix Index C53000-G7040-C101-2...
  • Page 2 Disclaimer of Liability Copyright Subject to changes and errors. The information given in Copyright © Siemens 2020. 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 device family. It describes various functions (protection and supervi- sion) 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 The Reyrolle catalog describes the system features and the devices of Reyrolle . • Selection guide for Reyrolle and SIPROTEC The selection guide offers an overview of the device series of the Siemens protection devices, and a device selection table. Indication of Conformity...
  • Page 5 Preface 90459 Nuremberg Internet: www.siemens.com/poweracademy Germany Notes on Safety This document is not a complete index of all safety measures required for operation of the equipment (module or device). However, it comprises important information that must be followed for personal safety, as well as to avoid material damage.
  • Page 6 Preface Problem-free and safe operation of the product depends on the following: • Proper transport • Proper storage, setup and installation • Proper operation and maintenance 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: •...

  • 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, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 9: Table Of Contents

    Table of Contents Preface................................3 Open Source Software..........................7 Introduction..............................11 7SR45 Overcurrent and Earth Fault Relay Overview............12 Ordering Options......................14 Device Functionality........................... 17 Front Fascia........................18 2.1.1 Front Fascia ........................ 18 2.1.2 Liquid Crystal Display....................19 2.1.3 Keypad........................20 2.1.4 Light Emitting Diode (LED)...................21 2.1.5 Local Flag........................
  • Page 10 Table of Contents Instantaneous Derived Earth Fault Protection (50N)............82 Time-Delayed Derived Earth Fault Protection (51N)............83 Instantaneous Measured Earth Fault Protection (50G)............84 Time-Delayed Measured Earth Fault Protection (51G)............85 Switch On To Fault Protection (50LC/SOTF)................86 Thermal Overload Protection (49)..................87 4.10 2nd Harmonic Block/Inrush Restraint (81HBL2)..............

  • Page 11: Introduction

    Introduction 7SR45 Overcurrent and Earth Fault Relay Overview Ordering Options Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 12: 7Sr45 Overcurrent And Earth Fault Relay Overview

    The 7SR45 Argus self powered/dual powered non-directional overcurrent and earth fault relay is a member of the Siemens Reyrolle protection devices Argus product family. The relay is developed using the latest genera- tion of hardware technology and is available in multiple variants depending on the following: •...
  • Page 13 Introduction 1.1 7SR45 Overcurrent and Earth Fault Relay Overview General Properties • CT powered with option for an external auxiliary supply connection • Dedicated switch-on-to-fault (SOTF) protection • Self-monitoring – Including battery condition monitor • High sensitivity – Trip ready at 20 % of I (1-phase) and 10 % of I (3-phase) rated...

  • Page 14: Ordering Options

    Introduction 1.2 Ordering Options Ordering Options Ordering Information – 7SR45 Argus Product Description Order Number – 9 10 11 12 – 13 14 15 16 Non-Directional Overcurrent and Earth □ – □ □ □ □ – □ Fault Relay Case I/O and Fascia Size 4 moulded case, 4 CT , 2 BI/2 BO, pulse output, 9 LEDs H/J A...
  • Page 15 Main battery CR123A + RTC battery CR1632 7XG1900-0MA54-0FC0 Transparent front cover for height reduced 7SR4503/7SR4504 variants 7XG1900-0MA55-0FC0 Surface mounting bracket 7XG1900-0MA56-0FC0 CT terminal cover for IP20 Siemens recommends to procure these battery spares from local market. Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...
  • Page 16 Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 17: Device Functionality

    Device Functionality Front Fascia Binary Inputs Binary Outputs Pulse Output Remote Flag Output Reset LED, Trip Flag Indication, and Binary Outputs Data Storage Real Time Clock Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 18: Front Fascia

    Device Functionality 2.1 Front Fascia Front Fascia Front Fascia 2.1.1 The front fascia is part of the relay. It is designed to provide a user-friendly method of entering the settings and retrieving data from the relay. You can access all of the push-buttons and perform the setting changes. The front fascia contains 5 predefined LED lists which provide the information about the LED indicators and a paper label for 4 user-programmable LEDs.

  • Page 19: Liquid Crystal Display

    Device Functionality 2.1 Front Fascia Front Fascia without Flag Output [dw_7SR45_frontfascia_withoutflagoutput, 1, en_US] Figure 2-2 Front Fascia without Flag Output NOTE 7SR45 Argus Relay devices (7SR450/FF and 7SR450/EE) having the front fascia label with 9 non-program- mable LEDs can be upgraded with the latest firmware release 2438H8001R2f-1a. In this case, you can use one of the following approaches: •...

  • Page 20: Keypad

    Device Functionality 2.1 Front Fascia • Battery profile • Auxiliary-power status • Primary and secondary current values of each phase and earth • General alarms The LCD displays the stored fault information to the operator. When any fault condition occurs, the relay displays the latest fault information on the LCD.

  • Page 21: Light Emitting Diode (Led)

    Device Functionality 2.1 Front Fascia Keys Description This push-button is used for selecting the parameter or confirming the values. The ENTER push-button is used to initiate and accept the setting changes. Press ENTER to edit the parameter setting. The setting value flashes and can be changed by using the ▲...
  • Page 22 Device Functionality 2.1 Front Fascia Trip Ready LED The steady illumination of Trip Ready LED indicates that required CT current 0.20 ⋅ I (minimum phase rated current) in 1-phase or 0.10 ⋅ I (minimum phase current) in 3-phase or auxiliary power supply is applied to rated the relay and the relay is having sufficient energy to trip through the impulse output.

  • Page 23: Local Flag

    Device Functionality 2.1 Front Fascia Parameters Description LED Default Value IE / E Phase E tripped Protection healthy Prot'n Healthy Battery volts low indication Low Battery Internal relay failure Local mode Local mode – Remote mode Remote mode – Out of Service mode Out of service mode –...

  • Page 24: Relay Information

    Device Functionality 2.1 Front Fascia Relay Information 2.1.6 The name plate contains the following product information: • Product name • Auxiliary voltage range • Rated burden • Rated current • Rated frequency • Binary-input voltage • MLFB ordering code, with hardware-version suffix •...
  • Page 25 Device Functionality 2.1 Front Fascia Symbol Description Dielectric test voltage 2 kV Impulse test voltage 5 kV Caution: Refer to equipment documentation Caution: Risk of electric shock Guidelines for Eurasian Markets European CE marking “WEEE" Symbol instructions. The product should not be disposed with other wastes at the end of its working life. Please separate the product from other types of wastes and recycle it responsibly to promote the sustainable reuse of material resources.

  • Page 26: Binary Inputs

    Device Functionality 2.2 Binary Inputs Binary Inputs Overview The binary inputs (BI) are optocouplers operated from a suitably rated AC/DC power supply. The device variant with AC/DC power supply has binary inputs with an operating threshold of AC/DC 88 V. Devices with DC auxiliary power supply have binary inputs with a threshold of DC 19 V.
  • Page 27 Device Functionality 2.2 Binary Inputs Parameters Description Default Value Min Step Change Inhibit 50G-1 50G-1 element block – – – Inhibit 50G-2 50G-2 element block – – – Inhibit 51G-1 51G-1 element block – – – Inhibit 50LC 50LC/SOTF element block – –...

  • Page 28: Binary Outputs

    Device Functionality 2.3 Binary Outputs Binary Outputs Overview The 7SR45 Argus Relay provides 2 or 4 binary outputs which can be configured to send commands to the switchgear units and annunciations for remote signaling of the important events and status. The binary output can be assigned to any available functions under OUTPUT CONFIG >...
  • Page 29 Device Functionality 2.3 Binary Outputs Binary Output Logic [lo_binary-output, 1, en_US] Figure 2-6 Binary Output Logic OUTPUT CONFIG > OUTPUT MATRIX OUTPUT CONFIG > BO CONFIG Binary Output Details Table 2-4 Binary Output Parameters Description Default Step Change Value 50-1 50-1 element operate –...
  • Page 30 If a binary output is assigned to IRF, do not use the same binary output for any other functions. NOTE The Reclose Inhibit parameter is only available in dual powered variants. Siemens recommends configuring this parameter with permanent auxiliary power.

  • Page 31: 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/font communication protocols, Siemens recommends using binary inputs for triggering the pulse output for remote trip applications.

  • Page 32: Remote Flag Output

    Device Functionality 2.5 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 33: Reset Led, Trip Flag Indication, And Binary Outputs

    Device Functionality 2.6 Reset LED, Trip Flag Indication, and Binary Outputs Reset LED, 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 34 Device Functionality 2.6 Reset LED, 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 Software When the relay is latched, LEDs can be reset by sending an appropriate command over the data communica- tion channels using Reydisp software.
  • Page 35 Device Functionality 2.6 Reset LED, Trip Flag Indication, and Binary Outputs [sc_resetflags, 1, en_US] Figure 2-8 Reset Flags TEST/RESET▶ Key From the Relay Identifier screen, reset the LEDs and outputs by pressing the 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 36: Data Storage

    Device Functionality 2.7 Data Storage Data Storage The relay stores 2 types of data: Fault records, 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) The fault records are generated when the protection function detects a fault condition and the trip alert message appears on the LCD.

  • Page 37: Real Time Clock

    Device Functionality 2.8 Real Time Clock Real Time Clock The time and date can be set either via the relay fascia using appropriate commands in the SYSTEM CONFIG menu or using the Reydisp software. When the relay is de-energized, the CR1632, 3 V 140 mAh Li/MnO coin cell batteries maintains the time and date.
  • Page 38 Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 39: Functions

    Functions Functions Available in the 7SR45 Device Instantaneous Overcurrent Protection (50) Time-Delayed Overcurrent Protection (51) Instantaneous Derived Earth Fault Protection (50N) Time-Delayed Derived Earth Fault Protection (51N) Instantaneous Measured Earth Fault Protection (50G) Time-Delayed Measured Earth Fault Protection (51G) Switch onto Fault Protection (50LC/SOTF) Thermal Overload Protection (49) 3.10 2nd Harmonic Block/Inrush Restraint (81HBL2)

  • Page 40: Functions Available In The 7Sr45 Device

    Functions 3.1 Functions Available in the 7SR45 Device Functions Available in the 7SR45 Device This section describes the functions available in the 7SR45 device. The relay provides protection functions and supervision functions as described below. Protection Functions • Instantaneous overcurrent protection (50) •...

  • Page 41: Instantaneous Overcurrent Protection (50)

    Functions 3.2 Instantaneous Overcurrent Protection (50) Instantaneous Overcurrent Protection (50) 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 42 Functions 3.2 Instantaneous Overcurrent Protection (50) Logic of the Function (50-n) [lo_7sr45_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. A separate setting is provided for each element.
  • Page 43 Functions 3.2 Instantaneous Overcurrent Protection (50) This setting is set to suit the individual application. 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 44: Time-Delayed Overcurrent Protection (51)

    Functions 3.3 Time-Delayed Overcurrent Protection (51) Time-Delayed Overcurrent Protection (51) 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 3.3 Time-Delayed Overcurrent Protection (51) Logic of the Function (51-n) [lo_7sr45_TimeDelayedOvercurrentFn, 2, en_US] Figure 3-2 Logic Diagram of the Time-Delayed Overcurrent Protection (51) The following characteristic curves are supported by 51-n: • • IEC-NI • IEC-VI • IEC-EI • IEC-LTI •...
  • Page 46 Functions 3.3 Time-Delayed Overcurrent Protection (51) 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 3.3 Time-Delayed Overcurrent Protection (51) able if more are required. A 51 element can provide a DTL operate and DTL reset characteristic if that is required. Set the characteristic to suit your application. Gn 51-n Time Mult (if Gn 51-n Char is set as IEC/ANSI) Default Setting: 1.00 This setting defines the time multiplier that is applied to the selected current curve.
  • Page 48 Functions 3.3 Time-Delayed Overcurrent Protection (51) 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 3.3 Time-Delayed Overcurrent Protection (51) Gn 51-n Setting 0.1 ⋅ I to 2.0 ⋅ I 1.0 ⋅ I – – rated rated rated Δ 0.01 ⋅ I rated 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...

  • Page 50: Instantaneous Derived Earth Fault Protection (50N)

    Functions 3.4 Instantaneous Derived Earth Fault Protection (50N) Instantaneous Derived Earth Fault Protection (50N) 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 51 Functions 3.4 Instantaneous Derived Earth Fault Protection (50N) 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 52 Functions 3.4 Instantaneous Derived Earth Fault Protection (50N) Gn 50N-n Setting 0.2 ⋅ I to 20.0 ⋅ I 1.0 ⋅ I – – rated rated rated Δ 0.1 ⋅ I rated Gn 50N-n Delay 0 s to < 20 s –...

  • Page 53: Time-Delayed Derived Earth Fault Protection (51N)

    Functions 3.5 Time-Delayed Derived Earth Fault Protection (51N) Time-Delayed Derived Earth Fault Protection (51N) 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 54 Functions 3.5 Time-Delayed Derived Earth Fault Protection (51N) 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 55 Functions 3.5 Time-Delayed Derived Earth Fault Protection (51N) Gn 51N-n Setting Default setting: 0.50 ⋅ I rated 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 56 Functions 3.5 Time-Delayed Derived Earth Fault Protection (51N) 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 57 Functions 3.5 Time-Delayed Derived Earth Fault Protection (51N) 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 58: Instantaneous Measured Earth Fault Protection (50G)

    Functions 3.6 Instantaneous Measured Earth Fault Protection (50G) Instantaneous Measured Earth Fault Protection (50G) Overview of the Function (50G) The instantaneous measured 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 59 Functions 3.6 Instantaneous Measured Earth Fault Protection (50G) 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. These settings can be used to select the number of elements required. Parameter State Description The element is inactive.
  • Page 60 Functions 3.6 Instantaneous Measured Earth Fault Protection (50G) Gn 50G-n Setting 0.2 ⋅ I to 20.0 ⋅ I 1.0 ⋅ I – – rated rated rated Δ 0.1 ⋅ I rated Gn 50G-n Delay 0 s to < 20 s –...

  • Page 61: Time-Delayed Measured Earth Fault Protection (51G)

    Functions 3.7 Time-Delayed Measured Earth Fault Protection (51G) Time-Delayed Measured Earth Fault Protection (51G) Overview of the Function (51G) The time-delayed measured 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 62 Functions 3.7 Time-Delayed Measured Earth Fault Protection (51G) • • 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 3-3 Constants for Operating-Curve and Reset-Curve Characteristics Operating Curve Reset Curve Curve Type...
  • Page 63 Functions 3.7 Time-Delayed Measured Earth Fault Protection (51G) Default setting: 0.5 ⋅ I rated 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 64 Functions 3.7 Time-Delayed Measured Earth Fault Protection (51G) Gn 51G-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 65 Functions 3.7 Time-Delayed Measured Earth Fault Protection (51G) Settings Menu CONFIGURATION > FUNCTION CONFIG Parameter Setting Options Settings Default Gn Measured E/F Disabled Disabled – – Enabled CONFIGURATION > CURRENT PROT'N > MEASURED E/F > 51G-n Parameter Setting Options Settings Default Gn 51G-n Element Disabled...

  • Page 66: Switch Onto Fault Protection (50Lc/Sotf)

    Functions 3.8 Switch onto Fault Protection (50LC/SOTF) Switch onto Fault Protection (50LC/SOTF) 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 67 Functions 3.8 Switch onto Fault Protection (50LC/SOTF) Logic of the Function (50LC/SOTF) [lo_7sr45_SwitchOnToFaultFn, 2, en_US] Figure 3-9 Logic Diagram of Switch onto Fault Protection (50LC/SOTF) The following graphs show the SOTF operating time for the CT power only. Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...
  • Page 68 Functions 3.8 Switch onto Fault Protection (50LC/SOTF) [dw_7SR45 sensitivity (binary outputs), 3, en_US] Figure 3-10 Operating Time for Switch onto Fault with Binary Outputs Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...
  • Page 69 Functions 3.8 Switch onto Fault Protection (50LC/SOTF) [dw_7SR45 sensitivity (pulse outputs), 3, en_US] Figure 3-11 Operating Time for Switch onto Fault with Pulse Output NOTE The multiphase faults results to a shorter operating time. Under the low battery or battery drained condition, the boot up time is increased by maximum of 25 ms. Operating time will be delayed by 200 ms when both the main battery and RTC battery are drained or removed.
  • Page 70 Functions 3.8 Switch onto Fault Protection (50LC/SOTF) second harmonic current content by the 81HBL2 element. This parameter can be configured to inhibit the overcurrent element automatically by configuration of this setting. Parameter State Description The element is not inhibited by operation of the 81HBL2 element Inhibit The overcurrent element is inhibited by operation of the 81HBL2 element and automatically released when the 81HBL2 element resets.

  • Page 71: Thermal Overload Protection (49)

    Functions 3.9 Thermal Overload Protection (49) Thermal Overload Protection (49) Overview of the Function (49) The thermal overload potection is used to: • Monitor the real-time thermal levels (θ) of the electrical equipment • Provide protection from thermal overload by tripping the electrical equipment NOTE The thermal overload protection function (49) is not available for 7SR450[1/3]-xGA10-1AA0 MLFB variants.
  • Page 72 Functions 3.9 Thermal Overload Protection (49) Logic of the Function (49) [lo_7sr45_ThermalOLFn, 2, en_US] Figure 3-12 Logic Diagram of the Thermal Overload Protection (49) Application and Settings Notes Gn 49 Element Default setting: Disabled This setting is used to allow the element to be switched on and off if it is not required. Parameter State Description The element is inactive.
  • Page 73 Functions 3.9 Thermal Overload Protection (49) The thermal state may be reset from the fascia or externally via a binary input or through a remote command from a control center. Gn TauH Default setting = 45.0 m Setting parameter for 49 Heating Time Constant. Used during normal service conditions and overloads of a protected equipment.
  • Page 74 Functions 3.9 Thermal Overload Protection (49) Settings Menu CONFIGURATION > FUNCTION CONFIG Parameter Setting Options Settings Default Gn Thermal O/L Disabled Disabled – – Enabled CONFIGURATION > CURRENT PROT'N> THERMAL O/L Parameter Setting Options Settings Default Gn 49 Element Disabled Disabled –...

  • Page 75: 2Nd Harmonic Block/Inrush Restraint (81Hbl2)

    Functions 3.10 2nd Harmonic Block/Inrush Restraint (81HBL2) 3.10 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 76 Functions 3.10 2nd Harmonic Block/Inrush Restraint (81HBL2) Application and Settings Notes 81HBL2 Setting Default setting: 0.20 ⋅ I 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.

  • Page 77: Technical Data

    Technical Data General Device Data Instantaneous Overcurrent Protection (50) Time-Delayed Overcurrent Protection (51) Instantaneous Derived Earth Fault Protection (50N) Time-Delayed Derived Earth Fault Protection (51N) Instantaneous Measured Earth Fault Protection (50G) Time-Delayed Measured Earth Fault Protection (51G) Switch On To Fault Protection (50LC/SOTF) Thermal Overload Protection (49) 4.10 2nd Harmonic Block/Inrush Restraint (81HBL2)

  • Page 78: General Device Data

    Technical Data 4.1 General Device Data General Device Data Technical Data Overview Product family Non-directional self powered/dual powered overcurrent and earth- fault relay Case and LEDs Non draw-out polycarbonate case (size 4 standard, non draw-out design), 5 non-programmable LEDs & 4 user-programmable LEDs Measuring inputs (Current) 1 A or 5 A 50 Hz/60 Hz...
  • Page 79 Technical Data 4.1 General Device Data Installation Category Installation category (overvoltage cate- Class III gory) Pollution Pollution degree Recommended Terminal Lugs Specifications Terminal Lugs Type/Cable Specifications Current inputs TE connectivity PIDG series insulated tin plated crimp ring terminal Stud size: M3.5 2.6 mm to 6.6 mm 12 AWG...

  • Page 80: Instantaneous Overcurrent Protection (50)

    Technical Data 4.2 Instantaneous Overcurrent Protection (50) Instantaneous Overcurrent Protection (50) Operation Non-directional Elements Phase Setting range I 0.2 ⋅ I to 20.0 ⋅ I rated rated Δ 0.1 ⋅ I rated Time delay 0.00 s to < 20.00 s, Δ 0.01 s ≥...

  • Page 81: Time-Delayed Overcurrent Protection (51)

    Technical Data 4.3 Time-Delayed Overcurrent Protection (51) Time-Delayed Overcurrent Protection (51) Operation Non-directional Elements Phase Setting range I (51) 0.1 ⋅ I to 2.0 ⋅ I rated rated Δ 0.01 ⋅ I rated Time multiplier 0.01 to 10.00 Δ 0.01 Time delay (DTL) 0.00 to 15.00 s Δ...

  • Page 82: Instantaneous Derived Earth Fault Protection (50N)

    Technical Data 4.4 Instantaneous Derived Earth Fault Protection (50N) Instantaneous Derived Earth Fault Protection (50N) Operation Non-directional Elements Derived earth Setting range I 0.2 ⋅ I to 20.0 ⋅ I rated rated Δ 0.1 ⋅ I rated Time delay 0.00 s to < 20.00 s, Δ 0.01 s ≥...

  • Page 83: Time-Delayed Derived Earth Fault Protection (51N)

    Technical Data 4.5 Time-Delayed Derived Earth Fault Protection (51N) Time-Delayed Derived Earth Fault Protection (51N) Operation Non-directional Elements Derived earth Setting range I (51N) 0.10 ⋅ I to 0.80 ⋅ I rated rated Δ 0.01 ⋅ I rated Time multiplier 0.01 to 10.00 Δ...

  • Page 84: Instantaneous Measured Earth Fault Protection (50G)

    Technical Data 4.6 Instantaneous Measured Earth Fault Protection (50G) Instantaneous Measured Earth Fault Protection (50G) Operation Non-directional Elements Measured earth Setting range I 0.2 ⋅ I to 20.0 ⋅ I rated rated Δ 0.1 ⋅ I rated Time delay 0.00 s to < 20.00 s, Δ 0.01 s ≥...

  • Page 85: Time-Delayed Measured Earth Fault Protection (51G)

    Technical Data 4.7 Time-Delayed Measured Earth Fault Protection (51G) Time-Delayed Measured Earth Fault Protection (51G) Operation Non-directional Elements Measured earth Setting range I (51G) 0.06 ⋅ I to 0.80 ⋅ I rated rated Δ 0.01 ⋅ I rated Time multiplier 0.01 to 10.00 Δ...

  • Page 86: Switch On To Fault Protection (50Lc/Sotf)

    Technical Data 4.8 Switch On To Fault Protection (50LC/SOTF) Switch On To Fault Protection (50LC/SOTF) Setting range 1 ⋅ I to 20 ⋅ I rated rated Operate level 100 % I , ± 5 % Disengaging time < 50 ms Operating time <...

  • Page 87: Thermal Overload Protection (49)

    Technical Data 4.9 Thermal Overload Protection (49) Thermal Overload Protection (49) Element Thermal overload Setting range 0.2 ⋅ I to 1.5 ⋅ I rated rated Δ 0.1 ⋅ I rated Heating time constant (TauH) 1.0 min to 300.0 min Δ 0.5 m Cooling time constant (TauC) 1.0 ⋅...

  • Page 88: 2Nd Harmonic Block/Inrush Restraint (81Hbl2)

    Technical Data 4.10 2nd Harmonic Block/Inrush Restraint (81HBL2) 4.10 2nd Harmonic Block/Inrush Restraint (81HBL2) 81HBL2 Inrush Setting 0.10 ⋅ I to 0.50 ⋅ I Where I = I (Ratio of 2 harmonic current to fundamental component current) 81HBL2 Inrush Release Block 0.3 ⋅...

  • Page 89: Applications

    Applications Overview Current-Transformer Requirements and Sample Calculations Time-Delayed Overcurrent (51/51G/51N) Overcurrent Characteristics Instantaneous Overcurrent (50/50G/50N) Thermal Overload (49) Inrush Response Inrush Detector (81HBL2) Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 90: Overview

    Applications 5.1 Overview Overview 7SR45 self powered/dual powered relay is a numerical overcurrent and earth-fault protection relay primarily intended for secondary distribution in electrical networks. The 7SR45 Argus relay is designed to operate with/without an auxiliary supply. The relay is powered primarily from the auxiliary voltage even though all other power sources are available.

  • Page 91: Current-Transformer Requirements And Sample Calculations

    The burden of the 7SR45 relay depends on the input current. The impedance of the relay is inversely propor- tional to the input current. Based on the field conditions, Siemens recommends selecting the primary CT turns ratio that is at least 10 % ⋅ I to reduce the dependency of the internal battery.
  • Page 92 Applications 5.2 Current-Transformer Requirements and Sample Calculations NOTE When all the 3 phases are available, the burden on each CT reduces. [dw_burden-of-relay-for-diff-currents_1A, 1, en_US] Figure 5-2 Burden of the Relay for Different Currents Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...
  • Page 93 Applications 5.2 Current-Transformer Requirements and Sample Calculations [dw_burden-of-relay-for-diff-currents_5A, 1, en_US] Figure 5-3 Burden of the Relay for Different Currents Sample Calculation CT ratio: 100/1 Rated CT burden (R ): 2.5 VA (R = 2.5 Ω for 1 A secondary current) CT winding resistance (R ): 0.5 Ω...
  • Page 94 For safe operation of the 7SR45 Argus Relay, the maximum power delivered to the relay is 1000 VA for 1 s. Moreover, Siemens does not recommend overloading the relay above 1000 VA for multiple times. For more information, refer to Thermal Withstand in Electrical Tests under Technical Data chapter in the Hard- ware Manual.

  • Page 95: Time-Delayed Overcurrent (51/51G/51N)

    Applications 5.3 Time-Delayed Overcurrent (51/51G/51N) Time-Delayed Overcurrent (51/51G/51N) The 51-n characteristic element provides a number of 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, and a number of manufacturer-specific curves are supported.
  • Page 96 Applications 5.3 Time-Delayed Overcurrent (51/51G/51N) [dw_IEC-NI-curve_with_min-op-time-setting-appl, 1, en_US] Figure 5-5 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 97: 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 98: Instantaneous Overcurrent (50/50G/50N)

    Applications 5.5 Instantaneous Overcurrent (50/50G/50N) Instantaneous Overcurrent (50/50G/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 99: Thermal Overload (49)

    Applications 5.6 Thermal Overload (49) Thermal Overload (49) Continuous overload current can cause the electrical equipment (cables/transformers) to heat above the rated temperature or thermal equilibrium. This would result in damage to the protected equipment. In order to overcome this issue, the electrical equipment must be protected from Thermal Overload. The thermal overload function monitors thermal levels (θ) of the electrical equipment thus tripping them in case of thermal overload.
  • Page 100 Applications 5.6 Thermal Overload (49) Case 2: Previous level [dw_7SR45_thermallevel_previouslevel, 1, en_US] NOTE This section is not applicable for 7SR450[1/3]-xGA10-1AA0 variants. Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 101: Inrush Response

    Applications 5.7 Inrush Response Inrush Response The 7SR45 Argus Relay is designed with immunity against inrush currents (15 % of 2 harmonic) up to 3 times the peak current with fundamental component (50 Hz/60 Hz) inside the currents less than 95 % of I During charging of transformer in the distribution system, the inrush current is generated and the relay does not respond to the inrush current up to 3 times the peak value as its not a fault condition.

  • Page 102: Inrush Detector (81Hbl2)

    Applications 5.8 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 103: Functional Tests

    Functional Tests Commissioning Notes Before Testing Applying Settings Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 104: Commissioning Notes

    Functional Tests 6.1 Commissioning Notes Commissioning Notes Overview The commissioning tests are carried out to prove the following: • The relay is not damaged in transit. • The relay is correctly connected and installed. • The characteristics of the protection and settings which are based on calculations. •...

  • Page 105: Before Testing

    Ensure that all of the test equipment and leads have been correctly maintained and are in good condi- tion. • Siemens recommends connecting all power supplies of the test equipment via a residual current relay (RCD) which must be located as close to the supply source as possible. •...

  • Page 106: Test Equipment

    Functional Tests 6.2 Before Testing Test Equipment 6.2.3 The following test equipment is required: • Secondary injection equipment with integral time interval meter • Primary injection equipment • A power source with rated voltage within the working range of the auxiliary-supply rating of the relay. •...

  • Page 107: Applying Settings

    Functional Tests 6.3 Applying Settings Applying Settings The relay settings for the particular application must be applied before any secondary testing occurs. If relay settings are not available, then the relay with default settings can be used for precommissioning tests. Note that the tripping and alarm contacts for any function must be programmed correctly before any scheme tests are carried out.
  • Page 108 Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 109: A Appendix

    Appendix Connection Examples for RMU Application Connection Examples for Distribution Transformer Application Connection Examples for Phase and CBCT Measurement Connection Examples for Earth-Fault Application Revision History Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 110: Connection Examples For Rmu Application

    Appendix A.1 Connection Examples for RMU Application Connection Examples for RMU Application Figure A-1 shows CT circuits connected to 1 A or 5 A of 7SR45 Argus relay. The CT and ground connections are typical and measure the phase current of the primary CT only. [dw_argus-relay_RMU-application, 2, en_US] Figure A-1 7SR45 Argus Relay for RMU Application...
  • Page 111 Appendix A.1 Connection Examples for RMU Application The application shows the use of 50/51/50N/51N/50LC/50G/51G/49 protection functions. The remote trip via communication (through BO with auxiliary input present) and binary input is possible. Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 112: Connection Examples For Distribution Transformer Application

    Appendix A.2 Connection Examples for Distribution Transformer Application Connection Examples for Distribution Transformer Application Figure A-3 shows CT circuits connected to 1 A or 5 A of 7SR45 Argus relay. The CT and ground connections are typical and measure the phase current and ground current of the primary CT only. [dw_self-powered-relay_distribution_transf-appl, 2, en_US] Figure A-3 7SR45 Self Powered Relay for Distribution Transformer Application...
  • Page 113 Appendix A.2 Connection Examples for Distribution Transformer Application [dw_argus-relay_distribution_transf-appl, 2, en_US] Figure A-4 7SR45 Argus Relay for Distribution Transformer Application The application shows the use of 50/51/50N/51N/50LC/50G/51G/49 protection functions. The remote trip via binary input is possible. Reyrolle, 7SR45, Device Manual C53000-G7040-C101-2, Edition 09.2020...

  • Page 114: Connection Examples For Phase And Cbct Measurement

    Appendix A.3 Connection Examples for Phase and CBCT Measurement Connection Examples for Phase and CBCT Measurement Figure A-5 shows CT circuits connected to 1 A or 5 A of 7SR45 Argus relay. The CT and ground connections are typical and measures the phase current and ground current of the primary CT only. [dw_argus-relay_with_phs-CBCT-measurement-appl, 2, en_US] Figure A-5 7SR45 Argus Relay with Phase and CBCT Measurement Application...

  • Page 115: Connection Examples For Earth-Fault Application

    Appendix A.4 Connection Examples for Earth-Fault Application Connection Examples for Earth-Fault Application Figure A-6 shows CT circuits connected to 1 A or 5 A of 7SR45 Argus relay. The CT and ground connections are typical and measure the ground current of the primary CT only. The application shows the use of 50G/51G protection functions.

  • Page 116: Revision History

    Appendix A.5 Revision History Revision History Software Revision History 2020/09 2438H80001R2f-1b Software maintenance • 2020/08 2438H80001R2f-1a Protection function 51-1 setting range change to 0.1 ⋅ I rated 2.0 ⋅ I rated • User-Programmable LED feature added 2020/05 2438H80001R2e-1b Software maintenance 2019/12 2438H80001R2e-1a Thermal overload protection function (49) added...

  • Page 117: Index

    Index 1,2,3 ... 2nd harmonic block/inrush restraint (81HBL2) 75 General alarms 20 General Properties 13 Auxiliary power 20 Inrush detector (81HBL2) 102 Inrush response 101 Installation category 79 Instantaneous Derived Earth Fault Protection (50N) 50 Instantaneous measured earth fault protection (50G) Battery profile 20 Binary inputs 26 Instantaneous overcurrent (50/50G/50N) 98...
  • Page 118 Index Remote flag output 32 Reset delay 97 Reset LED 33 Reset on battery 30 Reset on CT input or auxiliary voltage 30 RMU applications 110 Selection of overcurrent characteristics 97 Sensitivity 78 Switch onto fault protection (50LC) 66 Terminal lugs specifications 79 Thermal Overload (49) 99 Thermal overload protection (49) 71 Time delayed overcurrent (51/51G/51N) 95...

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