Siemens 7SR157 Argus User manual

Energy Management
7SR157 Argus
Check and System Synchronising Relay
Reyrolle
Protection
Devices

7SR157 Contents
Contents
Technical Manual Chapters
1. Description of Operation
2. Settings and Instruments
3. Performance Specification
4. Data Communications Definitions
5. Installation Guide
6. Commissioning and Maintenance
7. Applications Guide

7SR157 Contents

Chapter 1 - 7SR157 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.
© 2022 Siemens Protection Devices Limited
7SR157
Check and System Synchronising Relay
Description of Operation
Document Release History
This document is issue 2022/09. The list of revisions up to and including this issue is:
2022/09 UPSU introduced
2016/11 E6 case IEC61850 models introduced
2014 First issue
Software Revision History
Date Software Reference Summary
2016/11 2436H80010R4e-2a IEC61850 variants added
2014 2436H80010R2f-1a First issue

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Chapter 1 - Page 2 of 38 © 2022 Siemens Protection Devices Limited
Contents
Section 1: Introduction....................................................................................................................................... 5
Section 2: Hardware Description........................................................................................................................ 9
2.1 General............................................................................................................................................. 9
2.2 Case................................................................................................................................................. 9
2.3 Front Cover..................................................................................................................................... 10
2.4 Power Supply Unit (PSU) ................................................................................................................ 11
2.5 Operator Interface/ Fascia............................................................................................................... 12
2.6 Voltage Inputs................................................................................................................................. 15
2.7 Binary Inputs................................................................................................................................... 15
2.8 Binary Outputs (Output Relays) ....................................................................................................... 16
2.9 Virtual Input/Outputs........................................................................................................................ 17
2.10 Self Monitoring................................................................................................................................ 18
2.10.1 Protection Healthy/Defective .............................................................................................. 19
Section 3: Voltage Monitoring Functions .......................................................................................................... 20
3.1 Voltage Levels (Live and Dead status)............................................................................................. 20
3.1.1 VT Level Mode: 2 State...................................................................................................... 20
3.1.2 VT Level Mode: 3 State...................................................................................................... 21
3.3 Undervoltage Detector..................................................................................................................... 22
3.4 Differential Voltage Detector............................................................................................................ 22
3.5 Voltage Trim (Magnitude and Phase)............................................................................................... 22
Section 4: Control Functions............................................................................................................................ 23
4.1 25 Check Sync................................................................................................................................ 23
4.1.1 Close Guard ...................................................................................................................... 24
4.2 25 System Split Detector ................................................................................................................. 25
4.3 25 System Sync.............................................................................................................................. 26
4.4 25 Close On Zero............................................................................................................................ 28
4.5 Synchronising Bypass..................................................................................................................... 29
4.6 Quick Logic..................................................................................................................................... 30
Section 5: Supervision Functions ..................................................................................................................... 32
5.1 VT Supervision (60 VTF) ................................................................................................................. 32
5.2 Demand Metering............................................................................................................................ 32
5.3 Close Circuit Supervision (74CCS) .................................................................................................. 32
Section 6: Other Features................................................................................................................................ 33
6.1 Data Communications ..................................................................................................................... 33
6.2 IEC 61850 Communications ............................................................................................................ 33
6.3 Data Storage................................................................................................................................... 34
6.3.1 General............................................................................................................................. 34
6.3.2 Event Records................................................................................................................... 34
6.3.3 Waveform Records. ........................................................................................................... 34
6.3.4 Fault Data Records............................................................................................................ 34
6.3.5 Disk Activity Warning ......................................................................................................... 35
6.4 Instruments..................................................................................................................................... 35
6.5 Operating Mode .............................................................................................................................. 36
6.6 Real Time Clock.............................................................................................................................. 37
6.6.1 Time Synchronisation – Data Communication Interface....................................................... 37
6.6.2 Time Synchronisation – Binary Input .................................................................................. 37
6.7 Settings Groups .............................................................................................................................. 37
6.8 Password Feature........................................................................................................................... 38

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List of Figures
Figure 1-1 Protection Functions..........................................................................................................................7
Figure 1-2 Connections Diagram for 7SR157 Relay ............................................................................................8
Figure 2-1 Relay shown withdrawn.....................................................................................................................9
Figure 2-2 Rear view of Relay (E6 Case with optional IEC61850 module)..........................................................10
Figure 2-3 Relay with standard transparent cover .............................................................................................10
Figure 2-4 Relay with transparent cover and push buttons ................................................................................11
Figure 2-5 Relay with Transparent cover removed ............................................................................................12
Figure 2-6 Close up of Relay Label...................................................................................................................12
Figure 2-7 Close up of Relay Identifier..............................................................................................................13
Figure 2-8 LED Indication Label (partial)...........................................................................................................15
Figure 2-9 Binary Input Logic............................................................................................................................16
Figure 2-10 Binary Output Logic .......................................................................................................................17
Figure 2-11 Unexpected Restarts Lockout Text.................................................................................................18
Figure 2-12 Start-up Events .............................................................................................................................19
Figure 3-1 VT Level Mode: 2 State ...................................................................................................................20
Figure 3-2 VT Level Mode: 3 State Live Output.................................................................................................21
Figure 3-3 VT Level Mode: 3 State Dead Output...............................................................................................21
Figure 4-1 Voltage Check Function logic...........................................................................................................23
Figure 4-2 Check Sync Function logic...............................................................................................................24
Figure 4-3 System Sync Function logic.............................................................................................................27
Figure 4-4 Close On Zero Function logic...........................................................................................................28
Figure 4-5 Sequence Diagram: Quick Logic PU/DO Timers (Counter Reset Mode Off).......................................31
Figure 4-6 Logic Diagram: Close Circuit Supervision Feature (74CCS)..............................................................32
List of Tables
Table 1-1 7SR157 Ordering Options.............................................................................................................6
Table 2-1 Summary of 7SR157 Relay Configurations....................................................................................9
Table 4-1 Operating Mode .........................................................................................................................36

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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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Section 1: Introduction
This manual is applicable to the following relays:
7SR157 Check and System Synchronising Relay
The ‘Ordering Option’ Tables summarise the features available in each model
General Safety Precautions
External Resistors
Where external resistors are fitted to relays, these may present a danger of electric shock or burns, if touched.
Front Cover
The front cover provides additional securing of the relay element within the case. The relay cover should be in
place during normal operating conditions.
!
!

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Table 1-1 7SR157 Ordering Options
1) E4 case is standard, E6 case is required if IEC61850 option fitted
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
ORDER-No.: 7 S R 1 5 7 - 5 A - C A 0
| | | | | | | | | | | |
Protection Product Family 5| | | | | | | | | | |
Voltage 5| | | | | | | | | | |
| | | | ||| ||||
Relay Type 6|| | | | | | | | |
Check Synchronising 7|| | | | | | | | |
|| | ||| ||||
Case, I/O and Fascia 7| | | | | | | | |
2 VT, 3 Binary Inputs / 5 Binary Outputs, 10 LEDs 7| | | | | | | | |
2 VT, 6 Binary Inputs / 8 Binary Outputs, 10 LEDs 8| | | | | | | | |
| | ||| ||||
Measuring input 8| | | | | | | |
40-160V, 50/60Hz 5| | | | | | | |
|||| ||||
Auxiliary voltage 9| | | | | | |
80 to 250 VDC / 115 VAC, binary input threshold 19 V DC G| | | | | | |
80 to 250 V DC, binary input threshold 88 V DC H| | | | | | |
24 to 60 V DC, binary input threshold 19 V DC J| | | | | | |
PSU Rated: 24-250V DC / 100-230V AC.
Binary input threshold 19V DC (Rated: 24
-
250V DC)
M| | | | | | |
PSU Rated: 24-250V DC / 100-230V AC.
Binary input threshold 88V DC (Rated: 110
-
250V DC)
N| | | | | | |
||| ||||
Spare 10 | | | | | |
A| | | | | |
|| ||||
Communication Interface 11 || | | |
Standard version - included in all models, USB front port, RS485 rear port (E4 case) 1) 12| | | |
Standard version - plus additional rear electrical Ethernet RJ45 (x2) (E6 Case) 1) 77| | | |
Standard version - plus additional rear optical Ethernet duplex (x2) (E6 Case) 1) 87| | | |
| ||||
Protocol 12 | | | |
IEC 60870-5-103, Modbus RTU and DNP3 (user selectable setting) 2| | | |
IEC 60870-5-103, Modbus RTU, DNP3 and IEC 61850. (user selectable settings) 7| | | |
||||
Front Cover 13 | | |
Standard Version - No Push Buttons 1| | |
Push Buttons - Down and right Arrows 2| | |
|||
Protection Function Packages 14 | |
Standard Version - 25 Check Synchronising C| |
| |
Additional Functionality 15 |
No additional functionality A|
|
Spare 16
0

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The relay has 2 VT inputs:
Figure 1-1 Protection Functions

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Figure 1-2 Connections Diagram for 7SR157 Relay

Chapter 1 - 7SR157 Description of Operation
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Section 2: Hardware Description
2.1 General
The structure of the relay is based upon the Reyrolle Compact hardware platform. The relay is supplied in a size
E4 or E6 case (where 1 x E = width of approx. 26mm). The hardware design provides commonality between
products and components across the Reyrolle Compact range of relays.
Table 2-1 Summary of 7SR157 Relay Configurations
Relay Voltage
Inputs
Binary
Inputs
Binary
Outputs
LEDs
7SR1577 2 3 5 10
7SR1578 2 6 8 10
2.2 Case
The relays are housed in cases designed to fit directly into standard panel racks. The two case options have a
width of 104mm (E4) and 156 mm (E6), both have a height of 177 mm (4U). The required panel depth is
216.5mm, with wiring clearance a total of 242 mm. 290mm depth clearance should be allowed to accommodate
the bending radius of fibre optic data communications cables if fitted.
The complete relay assembly is withdrawable from the front of the case. Contacts in the case ensure that the
normally closed contacts remain short-circuited when the relay is removed. To withdraw the relay, remove the
plastic fascia cover by rotating the two securing pins and withdraw using the plastic handles. The relay should not
be carried using these handles. The relay should only be held by the top and bottom plates and the user should
not touch the exposed PCB’s.
Figure 2-1 Relay shown withdrawn

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The rear terminal blocks comprise M4 female terminals for wire connections. Each terminal can accept two 4mm
crimps.
Figure 2-2 Rear view of Relay (E6 Case with optional IEC61850 module)
Located at the top rear of the case is a screw clamp earthing point, this must be connected to terminal 28 and
directly to the main panel earth.
See Chapter 5 (Installation Guide) for full details of panel cut-out and internal clearance requirements.
2.3 Front Cover
As standard the relay is supplied with a transparent front cover. The front cover is used to secure the relay
assembly in the case and it is recommended that the cover is always fitted when the relay is in service.
Figure 2-3 Relay with standard transparent cover
If access is required to view the menus without removing the cover, an alternative transparent cover with push
buttons may be ordered. With the cover in place the user will only have access to the ▼and TEST/RESET►
buttons, allowing all areas of the menu system to be viewed, but preventing setting changes and control actions.
The only ‘action’ that is permitted is to reset the Fault Data display, latched binary outputs and LEDs by using the
TEST/RESETbutton.

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Figure 2-4 Relay with transparent cover and push buttons
2.4 Power Supply Unit (PSU)
Ordering Option Auxiliary Voltage Binary Input Threshold
G80V - 250V DC
110 / 115 V AC
19V DC
H
80V
-
250V DC
88V DC
J
24V
-
60V DC
19V DC
M24V - 250V DC
100
-
230V AC
19V DC
N24V - 250V DC
100
-
230V AC
88V DC
Relay PSU options allow the relay to be directly connected to dc system rated from 24V to 60V or 80 to 250V with
the original options. The Universal PSU can be connected to dc systems rated from 24V to 250V and AC systems
from 100V to 230V. The 80-250Vdc PSU can also be used with 110/115V AC supplies. For consistency and
safety it is advised that AC connections to the auxiliary supply are made with the Live connection to the +ve
terminal and Neutral connection to –ve. The high voltage PSU and the Universal PSU will operate normally for
reversed polarity DC auxiliary voltages.
In the event of the station battery voltage level falling below the relay minimum operate level, the PSU will
automatically switch itself off and latch out – this prevents any PSU overload conditions occurring. The PSU is
reset by switching the auxiliary supply off and on.
The PSU does not contain any fuses or user serviceable protection components. Typically the PSU is connected
to the auxiliary supply via an external HRC fuse rated at 6A (BS88/IEC60259). Isolation links may also be
installed in accordance with user requirements.

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2.5 Operator Interface/ Fascia
The operator interface is designed to provide a user-friendly method of controlling, entering settings and retrieving
data from the relay.
Figure 2-5 Relay with Transparent cover removed
The fascia is an integral part of the relay. Handles are located at each side of the relay which allow it to be
withdrawn from the relay case. The relay should not be carried by these handles.
Relay Information
Above the LCD two labels are provided, these provide the following information:
1) Product Information & Rating Label, containing
MLFB ordering code, with hardware version suffix.
Product name
Rated frequency
Auxiliary supply rating
Voltage rating
Binary input supply rating
Serial number
2) Blank label for user defined information.
Figure 2-6 Close up of Relay Label
A template is available in Reydisp Evolution software to allow users to create and print customised labels.

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For safety reasons the following symbols are displayed on the fascia
Dielectric Test Voltage 2kV
Impulse Test Above 5kV
Caution: Risk of Electric Shock
Caution : Refer to Equipment Documentation
Liquid Crystal Display (LCD)
A 4 line by 20-character alpha-numeric liquid crystal display indicates settings, instrumentation, fault data and
control commands.
To conserve power the display backlighting is extinguished when no buttons are pressed for a user defined
period. The ‘backlight timer’ setting within the “SYSTEM CONFIG” menu allows the timeout to be adjusted from 1
to 60 minutes and “Off” (backlight permanently on). Pressing any key will re-activate the display.
The LCD contrast can be adjusted using a flat blade screwdriver to turn the screw located below the contrast
symbol . Turning the screw clockwise increases the contrast, anti-clockwise reduces the contrast.
User defined indentifying text can be programmed into the relay using the System config/Relay Identifier and
System config/Circuit Identifier setting. The ‘Identifier’ texts are displayed on the LCD display, over two lines,
at the top level of the menu structure. The ‘Relay Identifier’ is used in communication with Reydisp to identify the
relay. Pressing the Cancel button several times will always return the user to this screen.
Figure 2-7 Close up of Relay Identifier

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LCD Indication
General Alarms are user defined text messages displayed on the LCD when mapped to binary or virtual inputs.
Up to six general alarms of 16 characters can be programmed, each triggered from one or more input. Each
general alarm will also generate an event.
If multiple alarms are activated simultaneously the messages are displayed on a separate page
in a rolling display on the LCD. The System Config>General Alarm Alert setting Enabled/Disabled allows the
user to select if the alarms are to be displayed on the LCD when active.
All general alarms raised when a fault trigger is generated will be logged into the Fault Data record.
Standard Keys
The relay is supplied as standard with five pushbuttons. The buttons are used to navigate the menu structure and
control relay functions. They are labelled:
▲Increases a setting or moves up menu.
▼Decreases a setting or moves down menu.
TEST/RESET►Moves right, can be used to reset selected functionality and for LED test (at
relay identifier screen).
ENTER Used to initiate and accept settings changes.
CANCEL Used to cancel settings changes and/or move up the menu structure by one
level per press.
NOTE: All settings and configuration of LEDs, BI and BO can be accessed and set by the user using these keys.
Alternatively configuration/settings files can be loaded into the relay using ‘Reydisp’. When the System
Config>Setting Dependencies is ENABLED, only the functions that are enabled will appear in the menu
structure.
‘PROT. HEALTHY’ LED
This green LED is steadily illuminated to indicate that DC voltage has been applied to the relay power supply and
that the relay is operating correctly. If the internal relay watchdog detects an internal fault then this LED will
continuously flash.
Indication LEDs
Relays have 9 user programmable LED indicators. Each LED can be programmed to be illuminated as green,
yellow or red. Where an LED is programmed to be lit both red and green it will illuminate yellow. The same LED
can be assigned two different colours dependent upon whether a Start/Pickup or Operate condition exists. LED’s
can be assigned to the pick-up condition and colour selected in the OUTPUT CONFIG>LED CONFIG menu.
Functions are assigned to the LEDs in the OUTPUT CONFIG>OUTPUT MATRIX menu.
Each LED can be labelled by withdrawing the relay and inserting a label strip into the pocket behind the front
fascia. A ‘template’ is available in the Reydisp software tool to allow users to create and print customised legends.
Each LED can be user programmed as hand or self–resetting. Hand reset LEDs can be reset by either pressing
the TEST/RESET►button, energising a suitably programmed binary input, or, by sending an appropriate
command over the data communications channel(s).
The status of hand reset LEDs is maintained by a back up storage capacitor in the event of an interruption to the
d.c. supply voltage.

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Figure 2-8 LED Indication Label (partial)
2.6 Voltage Inputs
The voltage inputs (Line Nom Voltage and Bus Nom Voltage) can be defined with a nominal rating between 40
– 160V.
Voltage is sampled at 32 samples per cycle (1600Hz for 50Hz and 1920Hz for 60Hz systems). Monitoring
functions of the relay use fundamental frequency voltage measurement.
The waveform recorder samples and displays voltage input waveforms at 32 samples per cycle.
The appropriate VT connection and ratio is set in the CT/VT CONFIG menu.
2.7 Binary Inputs
The binary inputs are based upon opto-coupler technology and are operated from a suitably rated power supply.
The binary inputs are polarity conscious and will not operate if the DC supply polarity is reversed. For consistency
and safety it is advised that AC connections for binary inputs are made with the Live connection to the +ve
terminal and Neutral connection to –ve.
The user can assign any binary input to any of the available functions (INPUT CONFIG > INPUT MATRIX).
Pick-up (PU) and drop-off (DO) time delays are associated with each binary input. Where no pick-up time delay
has been applied the input may pick-up due to induced ac voltage on the wiring connections (e.g. cross site
wiring). The default pick-up time of 20ms provides ac immunity. Each input can be programmed independently.
Each input may be logically inverted to facilitate integration of the relay within the user scheme. When inverted the
relay indicates that the BI is energised when no voltage is applied. Inversion occurs before the PU & DO time
delay, see Figure 2-9.
Binary inputs can be configured for intentional operation from a 110/115 V rms a.c. power supply by setting of
0ms PU and 25ms DO timers. If additional pickup or drop-off time delays are required by the scheme logic, this
functionality can be achieved by programmable logic within the device. For AC operation, live and neutral wiring
should be routed as a pair in close proximity and limited to a length of less than 10m.
Each input may be mapped to any front Fascia indication LED and/or to any Binary output contact and can also
be used with the internal user programmable logic. This allows the relay to provide panel indications and alarms.
Each binary input is set by default to be read when the relay is in both the local or remote condition. A setting is
provided to allow the user to select if each individual input shall be read when the relay is in the local or remote
condition in the INPUT CONFIG > BINARY INPUT CONFIG menu.

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Event
BI 1
Binary Input 1
=1
Inverted Inputs
BI 1 inverted BI 1 P/U Delay
Event
BI n
Binary Input n
=1
BI ninverted BI nP/U Delay
INPUT CONFIG>
INPUT MATRIX
(Or gates)
Logic signals
BI 1 D/O Delay
BI nD/O Delay
INPUT
CONFIG>
BINARY
INPUT
CONFIG
Figure 2-9 Binary Input Logic
2.8 Binary Outputs (Output Relays)
All outputs are fully user configurable and can be programmed to operate from any or all of the available
functions.
In the default mode of operation, binary outputs are self-reset and remain energised for a user-configurable
minimum time of up to 60 seconds. If required, outputs can be programmed to operate as ‘hand-reset’ or ‘pulsed’.
If the output is programmed to be both ‘hand-reset’ and ‘pulsed’ then the output will default to ‘hand-reset’ only.
Operating a binary output as ‘hand-reset’ fulfils the requirements of ANSI function 86 (Lockout).
The binary outputs can be used to operate the trip coils of the circuit breaker directly where the trip coil current
does not exceed the 'make and carry' contact rating. The circuit breaker auxiliary contacts or other in-series
auxiliary device must be used to break the trip coil current.
Any BO can be assigned as a ‘Trip Contact’ in the OUTPUT CONFIG>TRIP CONFIG menu. Operation of a ‘Trip
Contact’ will operate any LED or virtual assigned from the ‘Trip Triggered’ feature in the same menu and will
initiate the fault record storage, actuate the ‘Trip Alert’ screen where enabled and CB Fail protection when
enabled.
Where a protection function is mapped to an output contact, the output contact can be configured to trigger when
the protection function picks-up rather than when it operates. Such output contacts are configured via the
OUTPUT CONFIG>BINARY OUTPUT CONFIG>Pickup Outputs setting.
Notes on Pulsed Outputs
When operated, the output will reset after a user configurable time of up to 60 seconds regardless of the initiating
condition.
Notes on Self Reset Outputs
Self reset operation has a minimum reset time of 100ms
With a failed breaker condition the relay may remain operated until current flow is interrupted by an upstream
device. When the current is removed the relay will then reset and attempt to interrupt trip coil current flowing via
its output contact. Where this current level is above the break rating of the output contact an auxiliary relay with
heavy-duty contacts should be utilised in the primary system to avoid damage to the relay.
Notes on Hand Reset Outputs – 86 Lockout
Any binary output can be programmed to provide an 86 lockout function by selecting it to be hand reset. Hand
reset outputs can be reset by either pressing the TEST/RESET►button, by energising a suitably programmed
binary input, or, by sending an appropriate command over the data communications channel(s).
On loss of the auxiliary supply hand-reset outputs will reset. When the auxiliary supply is re-established the binary
output will remain in the reset state unless the initiating condition is still present.