Siemens 7SR45 Argus User manual

7SR45 Argus User Manual
Self Powered Overcurrent and Earth Fault Relay
Reyrolle
Protection
Devices

© 2017 Siemens Protection Devices Limited 2

7SR45 Argus Contents
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens ProtectionDevices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
© 2017 Siemens Protection Devices Limited
Contents
Technical Manual Chapters
1. Description of Operation
2. Settings, Configuration & Instruments
3. Performance Specifications
4. Installation
5. Commissioning and Maintenance
6. Applications Guide

7SR45 Description of Operation
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
© 2017 Siemens Protection Devices Limited
7SR45
Description of Operation
Document Release History
This document is issue 2017/06. The list of revisions up to and including this issue is:
2015/08 First Issue
2016/02 Second Issue
2017/03 Third Issue
2017/05 Fourth Issue
2017/06 Fifth Issue
Software Revision History
2015/08 2438H80001R1a-1a First Release
2017/03 2438H80001R1a-1b Hardware maintenance
2017/03 2438H80001R1c-1a Software maintenance to suit customer requirements
2017/05 2438H80001R1d-1a Software maintenance to suit customer requirements
2017/06 2438H80001R1e-1a Software maintenance

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© 2017 Siemens Protection Devices Limited Chapter 1 Page 2 of 34
Contents
Section 1: Introduction.......................................................................................................................................6
1.1 Current Transformer Circuits..............................................................................................................6
1.2 External Resistors..............................................................................................................................6
1.3 Description........................................................................................................................................6
1.4 OrderingOptions...............................................................................................................................7
1.5 Functional Diagram............................................................................................................................8
1.6 Terminal Diagram..............................................................................................................................9
Section 2: Hardware Description......................................................................................................................10
2.1 Operator Interface............................................................................................................................10
2.1.1 Liquid Crystal Display (LCD)...............................................................................................11
2.1.2 Keypad..............................................................................................................................12
2.1.3 Light Emitting Diode (LED).................................................................................................13
2.2 Home Screen ..................................................................................................................................13
2.3 Password Protection........................................................................................................................13
2.4 Software Version Menu....................................................................................................................14
2.5 Alert Screen ....................................................................................................................................14
2.5.1 Fault Alert..........................................................................................................................14
2.5.2 Alarm Alert.........................................................................................................................14
2.5.3 Info Alert............................................................................................................................14
2.6 Parameter Edit Screen.....................................................................................................................15
Section 3: Protection Functions (50, 51, 50N, 51N, 50G, 51G, 50LC)................................................................16
3.1 Instantaneous Overcurrent Protection (50)........................................................................................16
3.2 Time Delayed Overcurrent Protection (51)........................................................................................17
3.3 Instantaneous Derived Earth Fault Protection(50N)..........................................................................18
3.4 Time Delayed Derived Earth Fault Protection (51N)..........................................................................19
3.5 Instantaneous Measured Earth Fault Protection (50G)......................................................................20
3.6 Time Delayed Measured Earth Fault Protection (51G) ......................................................................21
3.7 Switch-On-To-Fault (50LC/SOTF)....................................................................................................22
3.8 General Alarm.................................................................................................................................24
3.9 Reset LEDs Outputs........................................................................................................................24
3.9.1 Binary Input........................................................................................................................24
3.9.2 Reydisp Software...............................................................................................................25
3.9.3 TEST/RESET►Key...........................................................................................................25
3.10 Current Inputs..................................................................................................................................26
3.11 Binary Inputs...................................................................................................................................26
3.12 Binary Outputs.................................................................................................................................27
3.12.1 Binary Output Matrix...........................................................................................................27
3.12.2 Self Reset/Hand Reset.......................................................................................................27
3.12.3 Binary Output Configuration................................................................................................27
3.13 Binary Output Operation ..................................................................................................................29
3.13.1 BO Trip/Reset on Battery Power and USB Power................................................................29
3.13.2 BO Trip/Reset on CT Power ...............................................................................................29
3.14 Impulse output.................................................................................................................................29
3.15 Modes of Operation.........................................................................................................................29
3.15.1 CT Power...........................................................................................................................29
3.15.2 USB Power........................................................................................................................31
3.15.3 Battery Power....................................................................................................................31
3.15.4 Sleep Mode........................................................................................................................31
3.15.5 Low Battery Indication........................................................................................................31
3.16 Maintenance Mode..........................................................................................................................32
3.16.1 Output Test........................................................................................................................32
3.17 Self Monitoring ................................................................................................................................32
3.17.1 Internal Relay Failure(IRF).................................................................................................32
3.18 Data Storage...................................................................................................................................33
3.18.1 Fault Records (Trip Log).....................................................................................................33
3.18.2 Event Records (Event Log).................................................................................................33

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3.19 Real Time Clock..............................................................................................................................34
3.20 Battery ............................................................................................................................................34
3.21 Firmware Update.............................................................................................................................34
List of Figures
Figure 1-1 Functional Diagram of 7SR45 Self Powered Overcurrent and Earth Fault Relay.............................8
Figure 1-2 Terminal Diagram of 7SR45 Self Powered Overcurrent and Earth Fault Relay ...............................9
Figure 2-1 LED Indication Label ..................................................................................................................10
Figure 2-2 Safety Symbols..........................................................................................................................11
Figure 2-3 Relay LCD.................................................................................................................................11
Figure 3-1 Logic Diagram: Instantaneous Overcurrent Element....................................................................16
Figure 3-2 Logic Diagram: Time Delayed Overcurrent Element.....................................................................17
Figure 3-3 Logic Diagram: Derived Instantaneous Earth Fault Element.........................................................18
Figure 3-4 Logic Diagram: Derived Time Delayed Earth Fault Protection......................................................19
Figure 3-5 Logic Diagram: Instantaneous Measured Earth-fault Element......................................................20
Figure 3-6 Logic Diagram: Measured Time Delayed Earth Fault Element......................................................21
Figure 3-7 Logic Diagram: 50LC Overcurrent Element .................................................................................22
Figure 3-8 Operating Time for Single Phase Fault with Binary Output...........................................................23
Figure 3-9 Operating Time for Single Phase Fault with Impulse Output.........................................................23
Figure 3-10 Reset LEDs Outputs: Reydisp Software Input Matrix...................................................................25
Figure 3-11 Reset Flags................................................................................................................................25
Figure 3-12 Binary Input Logic.......................................................................................................................26
Figure 3-13 Binary Output Logic....................................................................................................................28
Figure 3-14 Sensitivity for Single Phase Fault with Binary Output...................................................................30
Figure 3-15 Sensitivity for Single Phase Fault with Impulse Output.................................................................30
Symbols and Nomenclature
The following notational and formatting conventions are used within the remainder of this document:
•Setting Menu Location MAIN MENU>SUB-MENU
•Setting: Elem name -Setting
•Setting value: value
•Alternatives: [1st] [2nd] [3rd]

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© 2017 Siemens Protection Devices Limited Chapter 1 Page 4 of 34

7SR45 Description of Operation
© 2017 Siemens Protection Devices Limited Chapter 1 Page 5 of 34
DANGER
Danger of explosion of the battery.
Noncompliance with the safety instructions means that death, severe injuries, or
considerable material damages can occur.
Do not throw the lithium batteries into a fire.
WARNING
Warning about battery disposal.
Noncompliance with the safety instructions means that severe injuries or considerable
material damages can occur.
When discharged, or when properly secured against short-circuit, lithium batteries can be
disposed of through retailers or at depots run by competent organizations.
The batteries must be only replaced with the same type recommended by the manufacturer.
Improper replacement involves explosion hazard. For disposing the batteries, it is necessary to
observe the local national/international directives.
NOTE
7SR45 Argus with 1 contained lithium metal cylindrical cell (0.6 g lithium content) and 1 lithium
metal button cell meets the preconditions of special provision (SP)188 of the UN
Recommendations on the Transport of Dangerous Goods, 17th revised edition and is classified
according to:
•ADR/RID/ADN/IMDG-Code: UN 3091 Lithium metal batteries contained in equipment,
class 9, preconditions of SP 188 met.
•ICAO-TI/IATA-DGR: UN 3091 Lithium metal batteries contained in equipment, class 9,
preconditions of section II of packing instruction (PI) 970 met.
Do not transport the 7SR45 Argus when it is activated. Before transportation, ensure that the
7SR45 Argus is “not in the battery power mode”and paper strip is inserted between the
battery clip and battery.
The lithium metal cells for 7SR45 Argus (as a spare part) are also subject to the special
provision (SP)188 mentioned above, but classified according to:
•ADR/RID/AND/IMDG-Code: UN 3090 Lithium metal batteries, class 9, preconditions of SP
188 met.
•ICAO-TI/IATA-DGR: UN 3090 Lithium metal batteries, class 9, preconditions of section IB
or II of packing Instruction (PI) 968 met.

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© 2017 Siemens Protection Devices Limited Chapter 1 Page 6 of 34
Section 1: Introduction
This manual is applicable to the following relay:
•7SR45 Self Powered Overcurrent and Earth Fault Relay
General Safety Precautions
1.1 Current Transformer Circuits
The secondary circuit of a live CT must not be open circuited. Non-observance of this precaution can
result in injury to personnel or damage to equipment.
1.2 External Resistors
Where external resistors are connected to the relay circuitry, these may present a danger of electric
shock or burns, if touched.
1.3 Description
7SR45 self powered overcurrent and earth fault relay is developed using the latest generation of hardware
technology and is available in two variants depending on the CT ratings (1 A/5 A). 7SR45 is amember of
Siemens Reyrolle ®protection devices Argus product family.
7SR45 self powered overcurrent and earth fault relay is housed in a 4U high, size 4 non draw-out case and
provides protection, monitoring, and instrumentation functions with integrated input and output logic, events
(Event Log), and fault records (Trip Log).
The relay functionality can be configured via a front USB port. By using the Reydisp evolution software, the user
can update the settings and view the fault records (Trip Log) and events (Event Log).
!
!

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© 2017 Siemens Protection Devices Limited Chapter 1 Page 7 of 34
1.4 Ordering Options Reyrolle - 7SR45 Argus
Product
description Variants Order No.
1 2 3 4 5 6 7 - 8 9 10 11 12 - 13 14 15 16
7SR45 Argus
7
S
R
4
5
0
-
A
-
1
A
A
0
Non directional O/C Relay
Relay Type
Size 4 Moulded Case (Non-Drawout Design), 4 CT
1)
,
2 BI/2 BO, Impulse output, 9 LEDs
1
Measuring Input
1 A, 50/60 Hz
1
5 A, 50/60Hz
2
Auxiliary Voltage
Self Powered ( CT Powered Only)
G
Spare
A
Communication Options
Front Communication port : USB
1
Protocol
No Protocol (No rear port communication)
0
Front Fascia
Standard Version
1
Protection Function Packages - Standard version
50 Instantaneous phase fault overcurrent
A
50G/50N Instantaneous earth fault
51 Time delayed phase fault overcurrent
51G/51N Time delayed earth fault
50LC/SOTF Switch-On-To-Fault
Additional functionality
No additional functionality A
Spare
Spare
0
1) 4 CT is configured as 3PF + EF

7SR45 Description of Operation
© 2017 Siemens Protection Devices Limited Chapter 1 Page 8 of 34
Use the following ordering information to order 7SR45 self powered overcurrent and earth fault relay battery
spares.
Table 1-1 Battery Spares Ordering Options
NOTE:
If possible, it is recommended to procure the battery as per the Table 1-1 from the local supplier or local market.
1.5 Functional Diagram
Figure 1-1 Functional Diagram of 7SR45 Self Powered Overcurrent and Earth Fault Relay
Variants Description
7XG1900-1AA00-1000 Main Battery CR123A
7XG1900-2AA00-1000 RTC Battery CR1632
7XG1900-3AA00-1000 Main Battery CR123A + RTC Battery CR1632

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© 2017 Siemens Protection Devices Limited Chapter 1 Page 9 of 34
1.6 Terminal Diagram
The relay is housed in a non draw-out case 4U high size 4 case. The rear connection comprises of user-friendly
pluggable type terminals for Binary Input (BI), Binary Output (BO), Impulse output (PO), and Current Transformer
(CT) wire connections.
The CT terminals are suitable for ring type lug connection and to provide a secure and reliable termination.
Figure 1-2 Terminal Diagram of 7SR45 Self Powered Overcurrent and Earth Fault Relay

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© 2017 Siemens Protection Devices Limited Chapter 1 Page 10 of 34
Section 2: Hardware Description
2.1 Operator Interface
Figure 2-1 LED Indication Label
The rating label is located on the housing and provides more technical information about the 7SR45 self powered
overcurrent and earth fault relay.
Relay Information
The rating label contains the following product Information:
•Product name
•MLFB ordering code, with hardware version suffix
•Nominal current (In) rating
•Rated frequency
•Binary input supply rating
•Serial number

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© 2017 Siemens Protection Devices Limited Chapter 1 Page 11 of 34
For safety reasons, the following symbols are displayed on the label.
Figure 2-2 Safety Symbols
7SR45 self powered overcurrent and earth fault relay consist of the following human machine interface HMI):
1. LCD
2. Keypads
3. LED
2.1.1 Liquid Crystal Display (LCD)
7SR45 self powered overcurrent and earth fault relay consists of 16x2 LCD that indicates the settings,
instrumentation, and fault data.
By using the LCD, the user can view or edit a configuration parameter. LCD allows the user to view the real time
status of relay such as BI, BO, primary, and secondary current values of each phase and earth.
LCD displays the stored fault information to the user. When any fault condition occurs, the relay displays the latest
fault information in LCD.
The backlight TURNS ON automatically if the 7SR45 self powered overcurrent and earth fault relay is powered on
with CT power and the current is more than 0.4In (single phase) or 0.14In (three phase). If the 7SR45 self
powered overcurrent and earth fault relay is energized with current less than the defined limits, the backlight does
not TURN ON.
If the 7SR45 self powered overcurrent and earth fault relay is powered on by inserting a USB cable or by inserting
a battery, the backlight TURNSON automatically.
The backlight can be turned off manually by pressing the backlight key. If no activity is performed in the HMI for
more than 30 s, the backlight TURNS OFF automatically to save energy.
In the CT power mode, 7SR45 self powered overcurrent and earth fault relay periodically monitors that sufficient
current is available to TURN ON the back light.
In the USB or battery power mode, if the back light is already turned on and if the CT power source is provided,
the back light TURNS OFF due to the switching of power mode from USB or Battery to CT power. The back light
can be TURNED ON again if sufficient current is available.
For more information about power source, refer to Modes of Operation.
Figure 2-3 Relay LCD

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2.1.2 Keypad
7SR45 self powered overcurrent and earth fault relay keypad consists of 5 standard keys for navigation and
editing the values. The standard keys are used to navigate the menu structure and control the relay functions.
The 2 additional keys are available for LCD backlight and battery mode.
The keys are used for the following functions:
•To display and edit the relay settings
•To display the relay instrumentation and fault data
•To reset the output relays and LEDs
Used for navigating to sub menu or to increase the parameter value in the edit mode.
Used for navigating to sub menu or to decrease the parameter value in the edit mode.
Used for clearing the fault flags. By using this key, the user can acknowledge the LEDs and
binary output status. This key is also used for selecting the sub menu or selecting
parameter values in the edit mode.
Used for selecting parameter or confirming the values.
The ENTER key 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▲or ▼keys.
Used for navigating to previous menu or to discard the value.
The CANCEL key is used to return the relay to its initial status or one level above in the
menu structure.
Press CANCEL key repeatedly to return to the Relay Identifier screen.
Used to switch-on and switch-off the relay with battery power when USB and CT power are
not available.
Used to switch-on and switch-off the backlight.

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2.1.3 Light Emitting Diode (LED)
2.1.3.1 Indication
7SR45 self powered overcurrent and earth fault relay consists of 9 fixed function LEDs. LED indicates the
parameter status of therelay such as TRIP READY and PICKUP. The pre-defined LED functions are:
LEDs LED Functions Color
LED 1 PROT. HEALTHY GREEN
LED 2 PICKUP ON AMBER
LED 3 TRIP RED
LED 4 IL1 / A RED
LED 5 IL2 / B RED
LED 6 IL3 / C RED
LED 7 IE / E RED
LED 8 TRIP READY GREEN
LED 9 LOW BATTERY AMBER
2.1.3.2 Protection Healthy LED
The steady illumination of Protection Healthy LED indicates that required CT current is 0.20xIn (minimum phase
current) in single phase or 0.13xIn (minimum phase current) in three phases.
2.1.3.3 Trip Ready LED
The steady illumination of Trip Ready LED indicates that required CT current is 0.20xIn (minimum phase current)
in single phase or 0.13xIn (minimum phase current) in three phases and the relay is having sufficient energy to
trip through the impulse output.
2.2 Home Screen
After the relay is powered on, the user can access or navigate to other menus from the Home Screen.
The following operations can be performed from the Home Screen:
ENTER Press ENTER key to navigate to SETTING MODE
READ UP Press READ UP key to navigate to MAINTENANCE MODE
READ DOWN Press READ DOWN key to navigate to SETTING MODE
TEST/RESET►Press TEST/RESET►key to reset flag and LED
CANCEL+TEST/RESET►Press CANCEL+TEST/RESET►key to navigate to SOFTWARE VERSION
2.3 Password Protection
7SR45 self powered overcurrent and earth fault relay allowthe user to set the password via SETTING MODE >
SYSTEM CONFIG > PASSWORD. The length of the password should be 4 characters. Alphanumeric and
3 special characters such as “+”, “–“, and “/” are allowed.
The user password can be disabled by configuring as NONE.
From the parameter view screen, the user enters the password and presses ENTER for validation. If the entered
password is valid, the next screen appears. If the password is invalid, LCD displays the password retry screen
again.
After the successful login and editing of parameter, password prompt screen does not appear till the login expires.
If the user does not perform any operation for more than 1 minute, the login expires and unsaved settings will be
discarded.

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2.4 Software Version Menu
Software version menu can be viewed by holding the CANCEL key and followed by pressing of TEST/RESET►
key. The user can view the software information by pressing ▲or ▼key.
The software version menu contains the following information:
Firmware Art No. The firmware article number installed in the relay
Build Date The date of software version build
Build Time The time of software versionbuild
Serial No The serial number of the relay
MLFB MLFB number of the relay
Product Art No Unique number of the product assigned by SIEMENS
Product Name Product name for display
2.5 Alert Screen
2.5.1 Fault Alert
When any fault is detected by the relay, LCD pops-up the fault alert. Any previous alert pop-up messages are
updated or replaced by the latest message.
2.5.2 Alarm Alert
Alarm alert appears when any binary input is configured for general alarm and it is triggered.
2.5.3 Info Alert
Info alert displays the required information to the user. Info alert displays for 2 s and the alert clears automatically.
Table 1-2 shows the info. alert and the required description.
Table 1-2 Info Alert
This alert appears during the edit mode and after 15 s of inactivity time; the
edited value of the parameter will be discarded.
This alert appears when the fault flags are reset and LED test is performed.
This alert appears when the fault flags are reset.
This alert appears when reset of the fault flag is failed due to the presence of
fault current and the fault persists.
This alert appears when the user connects to the USB host.
Enter the password twice for confirmation or changing a password. This alert
message appears when the password does not match with the previously
typed password.
This alert appears when the password entered by the user contains "_" or
any special characters when changing the password.
This alert appears when the user selects to clear the fault or event records
and the operation is successful.
This alert appears when the relay is powered-on in the battery mode.

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© 2017 Siemens Protection Devices Limited Chapter 1 Page 15 of 34
This alert appears when the relay goes to sleep mode.
This alert appears when there is insufficient energy to perform the following
actions:
•Turn on backlight
•To operate or reset the binary outputs
This alert appears when the user clears the fault records, but the latest fault
is not acknowledged by resetting the flag.
This alert appears when the relay is powered by CT.
2.6 Parameter Edit Screen
7SR45 self powered overcurrent and earth fault relay allows the user to edit the parameter value in the LCD.
To edit the parameter, follow the procedure given below:
1. From the Relay Identifier screen, navigate to the Parameter screen.
2. In the Parameter screen, press ENTER key to display the edit screen.
3. In the Edit Screen, the user can edit the parameter value in the editable field.
4. Press ▲key and ▼key to select the valid value.
5. Press ENTER to save the parameter value.
To discard the parameter value, press the CANCEL key.
6. Press CANCEL till the user return to the Relay Identifier screen.
7. Press ENTER to save the configuration in memory.

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© 2017 Siemens Protection Devices Limited Chapter 1 Page 16 of 34
Section 3: Protection Functions (50, 51, 50N, 51N, 50G,
51G, 50LC)
3.1 Instantaneous Overcurrent Protection (50)
Two Instantaneous overcurrent elements are provided in the 7SR45 self powered overcurrent and earth fault
relay.
50-1, 50-2
Each instantaneous element (50-n) has independent settings. 50-n Setting for pick-up current and
50-n Delay definite time delay.
Operation of the instantaneous overcurrent elements can be inhibited from:
Inhibit 50-n A binary input.
Figure 3-1 Logic Diagram: Instantaneous Overcurrent Element
Table 3-1 Instantaneous Overcurrent Protection (50-n)
Parameters Description Default Value Min Max Step Change
50-n Element 50-n Block Disabled - - -
50-n Setting Current Set point 1 0.2xIn 20xIn 0.1
50-n Delay Delay time 0 0 600 s 0.01

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© 2017 Siemens Protection Devices Limited Chapter 1 Page 17 of 34
3.2 Time Delayed Overcurrent Protection (51)
One time delayed overcurrent element is provided in the 7SR45 self powered overcurrent and earth fault relay.
51-1
51-n Setting sets the pick-up current level.
A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is
selected from IEC, ANSI using 51-n Char. A timemultiplier is applied to the characteristic curves using the 51-n
Time Mult setting. Alternatively, a definite time lag delay (DTL) can be chosen using 51-n Char. When Definite
Time Lag (DTL) is selected the time multiplier is not applied and the 51-n Delay (DTL) setting is used instead.
The 51-n Reset settingcan apply a definite time delayed reset, or when the operation is configured as an IEC
or ANSI and if the reset is selected as (IEC/ANSI) DECAY reset, the associated reset curve will be used.
A minimum operate time for the characteristic can be set using 51-n MinOperate setting.
A fixed additional operate time can be added to the characteristic using 51-n Follower setting.
Operation of the time delayed overcurrent elements can be inhibited by assigning binary inputs.
Inhibit 51-n A binary input.
Figure 3-2 Logic Diagram: Time Delayed Overcurrent Element