Siemens 7SR10 Argus Series User manual

7SR10 Argus
Overcurrent Relay
Reyrolle
Protection
Devices

Siemens Protection Devices Limited2

7SR10 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 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.
© 2018 Siemens Protection Devices Limited
Contents
Technical Manual Chapters
1. Description of Operation
2. Settings & Instruments Guide
3. Performance Specification
4. Data Communications
5. Installation
6. Commissioning and Maintenance
7. Applications Guide

7SR10 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.
©2018 Siemens Protection Devices Limited
7SR10
Description of Operation
Document Release History
This document is issue 2018/07. The list of revisions up to and including this issue is:
2018/07 Twelfth Issue
2018/06 Eleventh Issue
2017/09 Tenth Issue
2017/07 Nineth Issue
2017/04 Eighth Issue
2017/03 Seventh Issue
2016/11 Sixth Issue
2015/09 Fifth Issue
2015/06 Fourth Issue
2015/03 Third Issue
2015/02 Second Issue
2013/11 First Issue
Software Revision History (7SR1002/7SR1003)
2018/05 2437H80001 R4h-2d Operating system upgrade
2017/09 2437H80001 R4d-2c Data Communications improvements
2017/04 2437H80001 R4c-2b Minor modification in Analog
2016/11 2437H80001 R4b-2b Support for Reydisp manager tool
2015/09 2437H80001 R4b-2a Addition of AR variants
2015/06 2437H80001 R4b-1f 81THD function added
2015/03 2437H80001 R4b-1e Addition of non-directional SEF device variants
2015/02 2437H80001 R4b-1d First Maintenance
2013/11 2436H80015 R2d-1a First Release
Software Revision History (7SR1004)
2018/06 2437H80008 R4h-1a First Release

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 2 of 77
Contents
Section 1: Introduction .......................................................................................................................................8
1.1 Current Transformer Circuits ..............................................................................................................8
1.2 External Resistors..............................................................................................................................8
1.3 Description ........................................................................................................................................8
1.4 Ordering Options ...............................................................................................................................9
1.5 Functional Diagram..........................................................................................................................11
1.6 Terminal Diagram ............................................................................................................................12
1.6.1 Terminal Diagram with Control Push Buttons ......................................................................12
Section 2: Hardware Description ......................................................................................................................14
2.1 General ...........................................................................................................................................14
2.2 Front Fascia ....................................................................................................................................15
2.2.1 Front Fascia with Control Push Buttons...............................................................................15
2.3 CB Open/Close ...............................................................................................................................15
2.4 Power Supply Unit (PSU).................................................................................................................16
2.5 Connectors......................................................................................................................................17
2.5.1 Connectors with Control Push Buttons ................................................................................17
2.6 Relay Information ............................................................................................................................17
2.7 Operator Interface............................................................................................................................19
2.7.1 Liquid Crystal Display (LCD) ...............................................................................................19
2.7.2 LCD Indication ...................................................................................................................19
2.7.3 Standard Keys ...................................................................................................................19
2.7.4 Protection Healthy LED ......................................................................................................20
2.7.5 Indication LEDs..................................................................................................................20
2.8 Current Inputs..................................................................................................................................20
2.9 Voltage Inputs .................................................................................................................................21
2.10 Binary Inputs ...................................................................................................................................21
2.11 Binary Outputs (Output Relays)........................................................................................................21
2.12 Virtual Input/Outputs ........................................................................................................................22
2.13 Self Monitoring ................................................................................................................................23
2.13.1 Protection Healthy/Defective...............................................................................................24
Section 3: Protection Functions ........................................................................................................................25
3.1 Current Protection: Phase Overcurrent (67, 51, 50)...........................................................................25
3.1.1 Directional Control of Overcurrent Protection (67)................................................................25
3.1.2 Instantaneous Overcurrent Protection (50) ..........................................................................26
3.1.3 Time Delayed Overcurrent Protection (51) ..........................................................................27
3.1.4 Current Protection: Voltage Controlled Overcurrent (51V)....................................................29
3.2 Current Protection: Derived Earth Fault (67N, 51N, 50N)...................................................................30
3.2.1 Directional Control of Derived Earth Fault Protection (67N)..................................................30
3.2.2 Instantaneous Derived Earth Fault Protection (50N) ............................................................31
3.2.3 Time Delayed Derived Earth Fault Protection (51N).............................................................32
3.3 Current Protection: Measured Earth Fault (67G, 51G, 50G)...............................................................34
3.3.1 Directional Control of Measured Earth Fault Protection (67G) ..............................................34
3.3.2 Instantaneous Measured Earth Fault Protection (50G).........................................................35
3.3.3 Time Delayed Measured Earth Fault Protection (51G) .........................................................36
3.4 Current Protection: Sensitive Earth Fault (67SEF, 51SEF, 50SEF)....................................................37
3.4.1 Directional Control of Sensitive Earth Fault Protection (67SEF)............................................37
3.4.2 Instantaneous Sensitive Earth Fault Protection (50SEF)......................................................38
3.4.3 Time Delayed Sensitive Earth Fault Protection (51SEF) ......................................................38
3.4.4 Current Protection: High Impedance Restricted Earth Fault - (64H)......................................40
3.4.5 Current Protection: Cold Load (51c)....................................................................................40
3.4.6 Current Protection: Negative Phase Sequence Overcurrent - (46NPS).................................41
3.4.7 Current Protection: Under-Current (37) ...............................................................................42
3.4.8 Current Protection: Thermal Overload (49)..........................................................................43
3.4.9 Voltage Protection: Phase Under/Over Voltage (27/59) .......................................................44
3.4.10 Voltage Protection: Negative Phase Sequence Overvoltage (47NPS) ..................................45
3.4.11 Voltage Protection: Neutral Overvoltage (59N) ....................................................................46
3.4.12 Voltage Protection: Under/Over Frequency (81) ..................................................................47
3.4.13 Power Protection: Power (32) .............................................................................................48

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 3 of 77
3.4.14 Power Protection: Sensitive Power (32S) ............................................................................49
3.4.15 Power Protection: Power Factor (55)...................................................................................50
Section 4: Auto-Reclose (79) Optional Function ................................................................................................51
4.1.1 Overview............................................................................................................................51
4.1.2 Auto Reclose sequences ....................................................................................................53
4.1.3 Autoreclose Prot’n Menu ....................................................................................................54
4.1.4 Autoreclose Config Menu ...................................................................................................54
4.1.5 P/F Shots sub-menu...........................................................................................................55
4.1.6 E/F Shots sub-menu...........................................................................................................55
4.1.7 SEF Shots sub-menu .........................................................................................................55
4.1.8 Extern Shots sub-menu ......................................................................................................55
4.2 Quick Logic .....................................................................................................................................58
4.3 Manual CB Control ..........................................................................................................................59
4.4 Circuit Breaker (CB).........................................................................................................................60
Section 5: Supervision Functions......................................................................................................................62
5.1 Circuit Breaker Failure (50BF) ..........................................................................................................62
5.2 2nd Harmonic Block/Inrush Restraint (81HBL2) Phase Elements Only ..............................................63
5.3 Total Harmonic Distortion Supervision (81THD) ................................................................................63
5.4 VT Supervision (60VTS) ..................................................................................................................64
5.5 CT Supervision (60CTS) ..................................................................................................................65
5.5.1 60CTS-I.............................................................................................................................65
5.5.2 60CTS ...............................................................................................................................66
5.6 Broken Conductor (46BC) ................................................................................................................66
5.7 Trip/ Close Circuit Supervision (74TCS & 74CCS) ............................................................................67
Section 6: Other Features ................................................................................................................................68
6.1 Data Communications......................................................................................................................68
6.1.1 Communication Ports .........................................................................................................68
6.2 CB Maintenance..............................................................................................................................71
6.2.1 Output Matrix Test..............................................................................................................71
6.2.2 CB Counters ......................................................................................................................71
6.2.3 I2t CB Wear........................................................................................................................72
6.3 Data Storage ...................................................................................................................................72
6.3.1 General..............................................................................................................................72
6.3.2 Demand.............................................................................................................................72
6.3.3 Event Records ...................................................................................................................72
6.3.4 Waveform Records.............................................................................................................73
6.3.5 Fault Records.....................................................................................................................73
6.3.6 Energy Storage..................................................................................................................73
6.3.7 Disk Activity Warning..........................................................................................................74
6.4 Metering ..........................................................................................................................................75
6.5 Operating Mode...............................................................................................................................75
6.6 Control Mode...................................................................................................................................75
6.7 Real Time Clock ..............................................................................................................................76
6.7.1 Time Synchronisation – Data Communication Interface .......................................................76
6.7.2 Time Synchronisation – Binary Input ...................................................................................76
6.8 Settings Groups...............................................................................................................................76
6.9 Password Feature............................................................................................................................76

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 4 of 77
List of Figures
Figure 2-1 7SR10 Argus Overcurrent Relay with Control Push Buttons...............................................................15
Figure 2-2 7SR10 Non-Directional and Directional Overcurrent Relay with Connectors .......................................17
Figure 2-3 Relay Rating Label ...........................................................................................................................18
Figure 2-4 Fascia Relay Rating Label ................................................................................................................18
Figure 2-5 Safety Symbols ................................................................................................................................18
Figure 2-6 Close up of Relay Identifier...............................................................................................................19
Figure 2-7 LED Indication Label ........................................................................................................................20
Figure 2-8 Binary Input Logic.............................................................................................................................21
Figure 2-9 Binary Output Logic..........................................................................................................................22
Figure 2-10 Start-up Counter Meter .....................................................................................................................23
Figure 2-11 Unexpected Restarts Lockout Text....................................................................................................23
Figure 2-12 Start-up Events ................................................................................................................................24
Figure 3-1 Logic Diagram: Directional Overcurrent Element (67).........................................................................26
Figure 3-2 Logic Diagram: Instantaneous Over-current Element .........................................................................27
Figure 3-3 Logic Diagram: Time Delayed Overcurrent Element...........................................................................28
Figure 3-4 Logic Diagram: Voltage Controlled Overcurrent Protection.................................................................29
Figure 3-5 Logic Diagram: Derived Directional Earth Fault Element ....................................................................30
Figure 3-6 Logic Diagram: Derived Instantaneous Earth Fault Element ...............................................................31
Figure 3-7 Logic Diagram: Derived Time Delayed Earth Fault Protection ............................................................33
Figure 3-8 Logic Diagram: Measured Directional Earth Fault Protection..............................................................34
Figure 3-9 Logic Diagram: Measured Instantaneous Earth-fault Element ............................................................35
Figure 3-10 Logic Diagram: Measured Time Delayed Earth Fault Element (51G) ..................................................36
Figure 3-11 Logic Diagram: SEF Directional Element (67SEF) .............................................................................37
Figure 3-12 Logic Diagram: 7SR10 SEF Instantaneous Element ..........................................................................38
Figure 3-13 Logic Diagram: 7SR10 SEF Instantaneous Element ..........................................................................38
Figure 3-14 Logic Diagram: 7SR10 SEF Time Delayed Element (51SEF) .............................................................39
Figure 3-15 Logic Diagram: 7SR10 SEF Time Delayed Element (51SEF) .............................................................39
Figure 3-16 Logic Diagram: High Impedance REF (64H)......................................................................................40
Figure 3-17 Logic Diagram: Cold Load Settings (51c)...........................................................................................41
Figure 3-18 Logic Diagram: Negative Phase Sequence Overcurrent (46NPS).......................................................42
Figure 3-19 Logic Diagram: Phase Current Inputs Undercurrent Detector (37) ......................................................42
Figure 3-20 Logic Diagram: Earth Current Inputs Undercurrent Detector (37G) .....................................................43
Figure 3-21 Logic Diagram: Sensitive Earth Current Inputs Undercurrent Detector (37SEF) ..................................43
Figure 3-22 Logic Diagram: Thermal Overload Protection (49) .............................................................................44
Figure 3-23 Logic Diagram: Under/Over Voltage Elements (27/59).......................................................................45
Figure 3-24 Logic Diagram: NPS Overvoltage Protection (47) ..............................................................................45
Figure 3-25 Logic Diagram: Neutral Overvoltage Element (59N)...........................................................................46
Figure 3-26 Logic Diagram: Under/Over Frequency Detector (81).........................................................................47
Figure 3-27 Logic Diagram: Power Protection (32) ...............................................................................................48
Figure 3-28 Logic Diagram: Sensitive Power Protection (32S)..............................................................................49
Figure 3-29 Logic Diagram: Power Factor Protection (55) ....................................................................................50
Figure 4-1 Typical AR Sequence with 3 Inst and 1 Delayed trip ..........................................................................53
Figure 4-2 Basic Auto-Reclose Sequence Diagram ............................................................................................57
Figure 4-3 Sequence Diagram: Quick Logic PU/DO Timers (Counter Reset Mode Off)........................................58
Figure 4-4 Logic Diagram: Circuit Breaker Status...............................................................................................61
Figure 5-1 Logic Diagram: Circuit Breaker Fail Protection (50BF) .......................................................................62
Figure 5-2 Logic Diagram: Harmonic Block Feature (81HBL2)............................................................................63
Figure 5-3 Logic Diagram: Total Harmonic Distortion Supervision Element (81THD) ...........................................64
Figure 5-4 Logic Diagram: VT Supervision Function (60VTS) .............................................................................65
Figure 5-5 Logic Diagram: CT Supervision Function (60CTS).............................................................................66

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 5 of 77
Figure 5-6 Logic Diagram: CT Supervision Function (60CTS).............................................................................66
Figure 5-7 Logic Diagram: Broken Conductor Function (46BC)...........................................................................67
Figure 5-8 Logic Diagram: Trip Circuit Supervision Feature (74TCS) ..................................................................67
Figure 5-9 Logic Diagram: Close Circuit Supervision Feature (74CCS) ...............................................................67
Figure 6-1 Communication to Front USB Port ....................................................................................................68
Figure 6-2 Connect Icon....................................................................................................................................68
Figure 6-3 Port Selection in Connection Manager ..............................................................................................69
Figure 6-4 System Information Icon ...................................................................................................................69
Figure 6-5 System Information Icon ...................................................................................................................70
Figure 6-6 Communication to Multiple Devices from Control System using RS485 ..............................................71
Figure 6-7 Energy Direction Convention.............................................................................................................74

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 6 of 77
List of Tables
Table 2-1 Summary of 7SR10 Argus Overcurrent Relay Configurations.............................................................14
Table 6-1 Operation Mode ...............................................................................................................................75

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 7 of 77
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]

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 8 of 77
Section 1: Introduction
This manual is applicable to the following relay:
•7SR10 Overcurrent 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
The 7SR10 Overcurrent relay is developed by using the latest generation of hardware technology and is available
in multiple variants depending on power supply, binary input/output configuration, voltage input, and data
communication facility. 7SR10 is a member of Siemens Reyrolle®protection devices Argus product family.
The 7SR10 overcurrent relay consists of non directional functions and with additional voltage inputs providing
directional functions (based on the ordering option).
The 7SR10 Overcurrent relay is housed in a 4U high, size 4 non draw-out case and these relays provide
protection, monitoring, instrumentation, and metering with integrated input and output logic, data logging and fault
reports.
Communication access to the relay functionality is via a front USB port for local PC connection or rear electrical
RS485 (optional) port for remote connection.
!
!

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 9 of 77
1.4 Ordering Options
Product Description
Variants
Order No.
1
2
3
4
5
6
7
-
8
9
10
11
12
-
13
14
15
16
7SR10 Argus
7
S
R
1
0
0
-
0
-
A
0
Non-Directional O/C Relay (Argus)
Case, I/O and Fascia
Size 4 Moulded case, 4 CT, 3 Binary Inputs/3 Binary Outputs, 10
LEDs
2
1
1
Size 4 Moulded case, 4CT, 6 Binary Inputs/6 Binary Outputs, 10 LEDs
3
Measuring input
1/5 A, 50/60Hz 1)
2/3
1
1/5 A, 50/60Hz with SEF input 2)
3
2
Auxiliary voltage
AC/DC 60-240V, Binary input threshold 44 V AC/DC
L
AC/DC 60-240V, Binary input threshold 88 V AC/DC
K
DC 24-60 V, Binary input threshold 19 VDC
J
Protective Cover
Standard version – No Cover
Plastic Cover with 1 Push Button for Test/Reset
A
B
Communication
Front Port : USB
2
1
Front Port : USB and Rear Port : RS-485 supporting IEC 60870-5-103
or Modbus RTU or DNP 3.0
3
2
Front Fascia
Standard Version – with Breaker Control Push Buttons
2
Protection Function Packages
C
Standard version - included in all models
46BC
Broken conductor/Load unbalance
46NPS
Negative phase sequence overcurrent
49
Thermal overload
50
Instantaneous phase fault overcurrent
50BF
Circuit breaker fail
50G/N
Instantaneous earth fault
50SEF 2)4)
Instantaneous sensitive earth fault overcurrent
51
Timed delayed phase fault overcurrent
51 G/N
Timed delayed earth fault
51SEF 2)4)
Time delayed sensitive earth fault
74T/CCS
Trip/close circuit supervision
81HBL2 3)
2nd Harmonic block/Inrush restraint
86
Hand reset contacts
51C
Cold load pickup
Programmable logic
81THD
Total harmonic distortion supervision
Standard version – plus
79 Autoreclose
D
Additional Functionality
No Additional Functionality
A
Special version 5)
Z Y 2 0
1) 4CT is configured as 3PF + EF
2) 4CT is configured as 3PF + SEF
3) Not available on SEF input
4) Only with position 7 = 3
5) Special version for Turkey market with thermal withstand capability of 500A (5A CT), 1 sec and
supporting Turkish scripts.
Available only with position 8 = 1

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 10 of 77
Product Description
Variants
Order No.
1
2
3
4
5
6
7
-
8
9
10
11
12
-
13
14
15
16
7SR10 Argus
7
S
R
1
0
0
-
0
-
A
0
Directional Overcurrent Relay (Argus)
Case, I/O and Fascia
Size 4 Moulded case, 4CT, 3 VT, 9 Binary Inputs/6 Binary Outputs,
10 LEDs
4
Measuring input
1A/5A, 50Hz/60Hz, 63.5/110V 1)
3
1A/5A, 50Hz/60Hz with SEF input, 63.5/110V 2)
4
Auxiliary voltage
AC/DC 60-240V, Binary input threshold 44V AC/DC
L
AC/DC 60-240V, Binary input threshold 88V AC/DC
K
DC 24-60V, Binary input threshold 19V DC
J
Protective Cover
Standard version – No Cover
Plastic Cover with 1 Push Button for Test/Reset
A
B
Communication
Front Port : USB and Rear Port : RS-485 supporting IEC 60870-5-103
or Modbus RTU or DNP 3.0
2
Front Fascia
Standard Version – with Breaker Control Push Buttons
2
Protection Function Packages
C
Standard version - included in all models
27/59
Under/overvoltage
32
Power
32S
Sensitive Power
37
Undercurrent
37G1)
Undercurrent measured earth fault
37SEF2)
Undercurrent sensitive earth fault
46BC
Broken conductor/Load Unbalance
46NPS
Negative phase sequence overcurrent
47NPS
Negative phase sequence overvoltage
49
Thermal overload
50BF
Circuit breaker fail
51V
Voltage dependent overcurrent
55
Power Factor
59N
Neutral voltage displacement
60CTS
CT supervision
60VTS
VT supervision
64H
High impedance REF
67/50
Directional instantaneous phase fault overcurrent
67/50G1) 67/50N
Directional instantaneous earth fault
67/50SEF 2)
Instantaneous sensitive earth fault
67/51
Directional time delayed phase fault overcurrent
67/51G1) 67/51N
Directional time delayed earth fault
67/51SEF 2)
Directional time delayed sensitive earth fault
81HBL2 3)
2
nd
Harmonic block/Inrush restraint
74T/CC
Trip & close circuit supervision
51C
Cold load pickup/Programmable Logic
81U/O
Under/Over Frequency
86
Hand reset contacts
Standard version – plus
79 Autoreclose
D
Additional Functionality
No Additional Functionality
A
1) 4CT is configured as 3PF + EF
2) 4CT is configured as 3PF + SEF
3) Not available on SEF input

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 11 of 77
1.5 Functional Diagram
7SR10
49 50
(x2)
51
(x2)
50G
(x2)
51G
(x2)
50
BF
50N
(x2)
51N
(x2)
46
BC
46
NPS
(x2)
81
HBL2
49 50
(x2)
50
BF
81
HBL2
49 50
(x2)
50
BF
81
HBL2
74
T/CCS
51
(x2)
51
(x2)
81
HBL2
N
81
HBL2
G
IL1
(IA)
IL2
(IB)
IL3
(IC)
50
BF
51c
51c
51c
86
I4
(IG)51SEF
(x2)
50SEF
(x2)
81
THD
81
THD
81
THD
79
Optional Version D software
Fig 1. 7SR10 Overcurrent Relay (Non-Directional)
7SR10
64H
46
BC
46
NPS
(x2)
37
(x2) 49 50 BF
V1
V2
V3
37
(x2) 49 50 BF
37
(x2) 49 50 BF
60
CTS
74
T/CCS
67/
50
(x4)
67/
51
(x4)
67/
50N
(x4)
67/
50
(x4)
67/
50
(x4)
67/
51
(x4)
67/
51
(x4)
67/
51N
(x4)
67/
50G
(x4)
67/
51G
(x4)
27
59
(x4)
27
59
(x4)
27
59
(x4)
59N
(x2)
47
(x2)
50
BF
50
BF
37 SEF
(x2)
81
HBL2
81
HBL2
81
HBL2
51V
51V
51V
67/
50SEF
(x4)
67/
51SEF
(x4)
81
(x4)
86
I L1
(I A )
I L2
(I B )
I
L3
(I C )
I
4
(I G/
S EF
)
32S
(x2)
60
VTS
51c
51c
51c
32
(x2)
32
(x2)
32
(x2)
55
(x2)
55
(x2)
55
(x2)
81
HBL2
G
37G
(x2)
79
Optional Version D software
Fig 2. 7SR10 Overcurrrent Relay (Directional)

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 12 of 77
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 the Voltage Inputs, Binary Inputs, Binary Outputs, Communication, and Power
Supply.
The CT terminals are fixed type and suitable for ring type lug connection to provide a secure and reliable
termination.
1.6.1 Terminal Diagram with Control Push Buttons
BI1
Term.
RS485
A
GND
B
+ve
-ve
1
2
3
1
2
BI2
+ve
-ve
3
4
BI3
+ve
-ve
5
6
1
2
3
4
BI4
+ve
-ve
7
8
BI5
+ve
-ve
9
10
BI6
+ve
-ve
11
12
X2
X3
X4 X5
BO3
7
8
BO5
11
12
BO6
13
14
IL4
5A
10
11
12
1A
IL3
5A
7
8
9
1A
IL2
5A
4
5
6
1A
IL1
5A
1
2
3
1A
5
6
4
BO2
BO12
3
1
BO4
9
10
X1
GND
L
N
E
Fig 3. Terminal/Wiring Diagram of 7SR10 Non-Directional Overcurrent Relay
NOTE:
For DC variants, connect the positive and negative terminals to X3: L and X3: N terminals respectively.

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 13 of 77
BI1
Term
RS485
A
GND
B
+ve
-ve
1
2
3
1
2
BI2
+ve
-ve
3
4
BI3
+ve
-ve
5
6
1
2
3
4
BI4
+ve
-ve
7
8
BI5
+ve
-ve
9
10
BI6
+ve
-ve
11
12
X2
X3
X4 X5
BO3
7
8
BO5
11
12
BO6
13
14
IL4
5A
10
11
12
1A
IL3
5A
7
8
9
1A
IL2
5A
4
5
6
1A
IL1
5A
1
2
3
1A
5
6
4
BO2
BO1
2
3
1
BO4
9
10
X1
BI7
+ve
-ve
1
2
BI8
+ve
-ve
3
4
BI9
+ve
-ve
5
6
X6
V1
1
2
V2
3
4
V3
5
6
X7
GND
L
N
E
Fig 4. Terminal/Wiring Diagram of 7SR10 Directional Overcurrent Relay
NOTE:
For DC variants, connect the positive and negative terminals to X3: L and X3: N terminals respectively.

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 14 of 77
Section 2: Hardware Description
2.1 General
The structure of the relay is based upon the compact hardware platform. The relays are supplied in a Size 4 case.
The hardware design provides a commonality between the products and components across the range of relays.
Table 2-1 Summary of 7SR10 Argus Overcurrent Relay Configurations
The 7SR10 Argus Overcurrent Relay is assembled from the following modules:
1. Front Fascia with 9 configurable LEDs and 1 Relay Healthy LED
2. Processor module
3. Current Analogue, Voltage Analogue, Input module and Output module
With control push buttons
4 x Current (Terminal X5)
6 x Binary Input (Terminal X1)
6 x Binary Outputs (Terminal X4)
3 x Voltage Inputs (Terminal X7)
3 x Binary Input (Terminal X6)
4. Communication and Power Supply module
With control push buttons
RS485 (Terminal X2)
Power supply (Terminal X3)
Relay Current
Inputs
Voltage
Inputs
Binary
Inputs
Binary
Outputs
LEDs
7SR1002 4 0 3 3 10
7SR1003 4 0 6 6 10
7SR1004 4 3 9 6 10

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 15 of 77
2.2 Front Fascia
The front fascia is an integral part of the relay and allows the user to access all the push buttons and performs the
setting changes and control actions. The fascia provides an option to reset the fault data display, latched binary
outputs, and LEDs by using the TEST/RESET► button. The front fascia contains the label strip which provides
the information about LED indicators.
Front Fascia consists of CB control push buttons to open and close.
2.2.1 Front Fascia with Control Push Buttons
Figure 2-1 7SR10 Argus Overcurrent Relay with Control Push Buttons
2.3 CB Open/Close
The circuit breaker (CB) control function is used to manually open and close the CB when it is connected to the
network. Two dedicated push buttons are provided on the HMI to execute the CB manual close and open
operations.
Button
Function
Description
Close Press Close button and confirm ENTER to execute the close
operation of circuit breaker.
Open Press Open button and confirm ENTER to execute the open
operation of circuit breaker.
The user can configure the binary input, binary output, and LED configuration for the CB open and close control
functions.
To perform the CB open and close control operations, follow the procedure given below:
1. Apply CB Close Binary Input (BI) to get the breaker status.
2. Press CB OPEN control key. The confirmation pop-up appears.

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 16 of 77
3. Press ENTER key to confirm.
4. The CB Open delay count-down starts and reaches to zero.
5. The configured BO and LED’s for the CB OPEN control functions will operate.
6. Press RESET button to reset LED and BO states.
Repeat the same procedure for CB CLOSE control logic operation.
NOTE:
If the "Control Password" is already configured in the settings, use the control password to execute the CB
open/close via control keys. For more information about the Control Password function, see Section 6.9
NOTE:
If the operating mode of 7SR10 Relay is remote, the user can perform the CB open and close operations when
the “FUNCTION KEY CONFIG” setting is enabled.
2.4 Power Supply Unit (PSU)
The relay is supplied with the following nominal power supply ranges:
•60 V - 240 V AC/DC power supply (BI threshold - 88 V AC/DC or 44 V AC/DC)
•24 V - 60 V DC power supply (BI threshold - 19 V DC)
The power supply module is equipped with 3 or 6 Binary Inputs. It also consists of one RS485 communication
interface (half duplex) for communicating with RTUs and parameterization of relays via remote locations.
For AC connections, the auxiliary supply is made with the live connection to positive terminal and neutral
connection to negative for consistency and safety.
For DC connections, the auxiliary supply is made with the positive connection to Line terminal (L) and negative
connection to Neutral (N) for consistency and safety.
In the event of the supply voltage levels are falling below the relay minimum operate level, the PSU will
automatically switch off itself and latch out and this prevents any PSU overload conditions occurring. The PSU is
reset by switching the auxiliary supply off and on.

7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 17 of 77
2.5 Connectors
In 7SR10 Argus Overcurrent relay, all the connectors are pluggable type except the CT connectors and it consists
of Binary Inputs and Binary Outputs connectors. The connector terminals are designated suitably.
In 7SR10 Argus Overcurrent relay, the CT connectors are fixed type. The other connectors for Voltage Inputs,
Binary Inputs, Binary Outputs, Communication, and Power Supply are pluggable type and designated suitably.
2.5.1 Connectors with Control Push Buttons
Current
Inputs
Binary
Output
Binary
Input
Rear
Communication
Port
Auxiliary
Supply
Current
Inputs
Binary
Output
Auxiliary
Supply
Rear
Communication
Port
Voltage
Inputs
Binary
Input
Figure 2-2 7SR10 Non-Directional and Directional Overcurrent Relay with Connectors
2.6 Relay Information
The rating label is located on the housing and provides more technical information about 7SR10 Argus
Overcurrent relay.
Relay Information
The rating label contains the following product Information:
•Product name
•MLFB ordering code, with hardware version suffix
•Nominal current rating
•Nominal voltage rating
•Rated frequency
•Auxiliary supply rating
•Binary input supply rating
•Serial number