Siemens 7SR224 Operating and installation instructions

(1) Description of Operation 7SR224
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shall be reproduced or modified or stored in another form, in any data retrieval system, without the permission of Siemens
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and all such liability is disclaimed.
©2009 Siemens Protection Devices Limited
DOCUMENTATION SET
This document is part of a set. The full list of documents in the set, and the publication numbers under
which they can be ordered, is given below. These documents can be provided on request to Siemens
Protection Devices Ltd. Tel. [phone]. They can also be found on our website at
www.reyrolle-protection.com.
RECLOSER CONTROLLER 7SR224
1. Description of Operation
2. Settings, Configuration & Instruments Guide
3. Performance Specification
4. Data Communications
5. Installation Guide
6. Commissioning & Maintenance Guide
7. Applications Guide
(1) Description of
Operation
7SR224
Recloser Controller

(1) Description of Operation 7SR224
Page 2 of 66 ©2009 Siemens Protection Devices Limited
DOCUMENT RELEASE HISTORY
This document is issue 2009/09. The list of revisions up to and including this issue is:
2008/03 First issue
2008/06 Second issue
2009/04 Third issue
2009/09 Fourth issue
SOFTWARE REVISION HISTORY
2008/03 2435H80011R2d-1a First Release
2008/06 2435H80011R3d-2b Second Release. Loss Of Voltage
2008/10 2435H80011R4-3 Third Release. Single/Triple AutoReclose function
2009/09 2435H80011R4c-3b Fourth Release. Maintenance Release

(1) Description of Operation 7SR224
©2009 Siemens Protection Devices Limited Page 3 of 66
CONTENTS
Documentation Set.................................................................................................................................1
Document Release History....................................................................................................................2
Software Revision History.....................................................................................................................2
Contents..................................................................................................................................................3
List of Figures.........................................................................................................................................5
List of Tables ..........................................................................................................................................6
Section 1: Introduction..........................................................................................................................7
1.1 Current Transformer Circuits ....................................................................................................7
1.2 External Resistors.....................................................................................................................7
1.3 Fibre Optic Communication ......................................................................................................7
1.4 Front Cover ...............................................................................................................................7
1.5 Front Fascia ..............................................................................................................................7
Section 2: Hardware Description........................................................................................................10
2.1 General ...................................................................................................................................10
2.2 Case........................................................................................................................................10
2.3 Front Cover .............................................................................................................................11
2.4 Power Supply Unit (PSU)........................................................................................................11
2.5 Operator Interface/ Fascia ......................................................................................................11
2.6 Current Inputs .........................................................................................................................13
2.7 Voltage Inputs .........................................................................................................................13
2.8 Binary Inputs ...........................................................................................................................14
2.9 Binary Outputs (Output Relays)..............................................................................................15
2.10 Virtual Input/Outputs ...............................................................................................................16
2.11 Self Monitoring Of The Controller ...........................................................................................16
2.11.1 Protection Healthy/Defective......................................................................................16
2.12 Battery And Capacitor Test Facility Of The Recloser .............................................................17
Section 3: Protection Functions.........................................................................................................18
3.1 Current Protection: Phase Overcurrent (67, 51, 50) ...............................................................18
3.1.1 Directional Control of Overcurrent Protection (67).....................................................18
3.1.2 Instantaneous Overcurrent Protection (50)................................................................20
3.1.3 Time Delayed Overcurrent Protection (51) ................................................................21
3.2 Current Protection: Voltage Controlled Overcurrent (51V) .....................................................23
3.3 Current Protection: Measured Earth Fault (67G, 51G, 50G) ..................................................24
3.3.1 Directional Control of Measured Earth Fault Protection (67G) ..................................24
3.3.2 Instantaneous Measured Earth Fault Protection (50G) .............................................25
3.3.3 Time Delayed Measured Earth Fault Protection (51G)..............................................26
3.4 Current Protection: Sensitive Earth Fault (67SEF, 51SEF, 50SEF).......................................27
3.4.1 Directional Control of Sensitive Earth Fault Protection (67SEF) ...............................27
3.4.2 Instantaneous Sensitive Earth Fault Protection (50SEF) ..........................................28
3.4.3 Time Delayed Sensitive Earth Fault Protection (51SEF)...........................................29
3.5 Current Protection: High Impedance Restricted Earth Fault (64H) ........................................30
3.6 Current Protection: Cold Load (51c) .......................................................................................31
3.7 Current Protection: Negative Phase Sequence Overcurrent (46NPS) ...................................32
3.8 Current Protection: Under-Current (37) ..................................................................................33
3.9 Current Protection: Thermal Overload (49) ............................................................................34
3.10 Voltage Protection: Phase Under/Over Voltage (27/59).........................................................36

(1) Description of Operation 7SR224
Page 4 of 66 ©2009 Siemens Protection Devices Limited
3.11 Voltage Protection: Negative Phase Sequence Overvoltage (47)..........................................37
3.12 Voltage Protection: Neutral Overvoltage (59N) ......................................................................38
3.13 Voltage Protection: Under/Over Frequency (81) ....................................................................39
Section 4: Control & Logic Functions................................................................................................40
4.1 Auto-Reclose (79) ...................................................................................................................40
4.1.1 Overview ....................................................................................................................40
Auto Reclose sequences ........................................................................................................42
4.1.2 AUTORECLOSE PROT’N Menu................................................................................43
4.1.3 AUTORECLOSE CONFIG Menu ...............................................................................43
4.1.4 P/F SHOTS sub-menu ...............................................................................................45
4.1.5 E/F SHOTS sub-menu ...............................................................................................45
4.1.6 SEF SHOTS sub-menu ..............................................................................................45
4.1.7 EXTERN SHOTS sub-menu ......................................................................................46
4.2 Manual Close ..........................................................................................................................48
4.3 Circuit Breaker ........................................................................................................................48
4.4 Quick Logic .............................................................................................................................50
Section 5: Supervision Functions ......................................................................................................52
5.1 Circuit Breaker Failure (50BF) ................................................................................................52
5.2 VT Supervision (60VTS) .........................................................................................................53
5.3 CT Supervision (60CTS) .........................................................................................................55
5.4 Broken Conductor (46BC).......................................................................................................56
5.5 Trip Circuit Supervision (74TCS) ............................................................................................56
5.6 Inrush Detector (81HBL2) .......................................................................................................57
5.7 Battery Test.............................................................................................................................58
5.8 Capacitor Test.........................................................................................................................59
5.9 Power Quality (27S/59S).........................................................................................................60
5.10 Demand...................................................................................................................................60
Section 6: Other Features....................................................................................................................61
6.1 Data Communications.............................................................................................................61
6.2 CB Maintenance......................................................................................................................61
6.3 Output Matrix Test...................................................................................................................62
6.4 Data Storage ...........................................................................................................................62
6.4.1 General.......................................................................................................................62
6.4.2 Event Records............................................................................................................62
6.4.3 Waveform Records.....................................................................................................62
6.4.4 Fault Records .............................................................................................................63
6.4.5 Data Log.....................................................................................................................63
6.5 Metering ..................................................................................................................................63
6.6 Operating Mode ......................................................................................................................64
6.7 Control Mode...........................................................................................................................64
6.8 Real Time Clock......................................................................................................................65
6.8.1 Time Synchronisation - IEC 60870-5-103 & DNP3.0.................................................65
6.8.2 Time Synchronisation – Binary Input .........................................................................65
6.8.3 Time Synchronisation – IRIG-B (Optional).................................................................65
6.9 Settings Groups ......................................................................................................................65
6.10 Password Feature ...................................................................................................................66

(1) Description of Operation 7SR224
©2009 Siemens Protection Devices Limited Page 5 of 66
LIST OF FIGURES
Figure 1.5-1 Functional Diagram of 7SR224 Relay Showing Possible External
Connections .........................................................................................................................9
Figure 2.5-1 7SR224 with 12 Function Keys and 3 + 8 LEDs in E10 Case...........................................11
Figure 2.8-1 Binary Input Logic .............................................................................................................14
Figure 2.9-1 Binary Output Logic ..........................................................................................................16
Figure 3.1-1 Logic Diagram: Directional Overcurrent Element (67).......................................................19
Figure 3.1-2 Logic Diagram: Instantaneous Over-current Element .......................................................20
Figure 3.1-3 Logic Diagram: Time Delayed Overcurrent Element .................................................22
Figure 3.2-1 Logic Diagram: Voltage Controlled Overcurrent Protection...............................................23
Figure 3.3-1 Logic Diagram: Measured Directional Earth Fault Protection ...........................................25
Figure 3.3-2 Logic Diagram: Measured Instantaneous Earth-fault Element..........................................25
Figure 3.3-3 Logic Diagram: Measured Time Delayed Earth Fault Element (51G) ...............................26
Figure 3.4-1 Logic Diagram: SEF Directional Element (67SEF)............................................................27
Figure 3.4-2 Logic Diagram: SEF Instantaneous Element.....................................................................28
Figure 3.4-3 Logic Diagram: SEF Time Delayed Element (51SEF).......................................................29
Figure 3.5-1 Logic Diagram: High Impedance REF (64H) .....................................................................30
Figure 3.6-1 Logic Diagram: Cold Load Settings (51c)..........................................................................31
Figure 3.7-1 Logic Diagram: Negative Phase Sequence Overcurrent (46NPS)....................................32
Figure 3.8-1 Logic Diagram: Undercurrent Detector (37) ......................................................................33
Figure 3.9-1 Logic Diagram: Thermal Overload Protection (49S)..........................................................35
Figure 3.10-1 Logic Diagram: Under/Over Voltage Elements (27/59) .............................................36
Figure 3.11-1 Logic Diagram: NPS Overvoltage Protection (47) .....................................................37
Figure 3.12-1 Logic Diagram: Neutral Overvoltage Element............................................................38
Figure 3.13-1 Logic Diagram: Under/Over Frequency Detector (81) ...............................................39
Figure 4.1-1 Typical Auto Reclose Sequence with 3 Instantaneous and 1 Delayed trip .......................42
Figure 4.1-2 Basic Auto-Reclose Sequence Diagram ...........................................................................47
Figure 4.3-1 Logic Diagram: Circuit Breaker Status...............................................................................49
Figure 4.4-1 Sequence Diagram: Quick Logic PU/DO Timers (Counter Reset Mode Off)....................51
Figure 5.1-1 Logic Diagram: Circuit Breaker Fail Protection (50BF).....................................................52
Figure 5.2-1 Logic Diagram: VT Supervision Function (60VTS)............................................................54
Figure 5.3-1 Logic Diagram: CT Supervision Function (60CTS) ..........................................................55
Figure 5.4-1 Logic Diagram: Broken Conductor Function (46BC) .........................................................56
Figure 5.5-1 Logic Diagram: Trip Circuit Supervision Feature (74TCS) ................................................56
Figure 5.6-1 Logic Diagram: Harmonic Block Feature (81HBL2) ..........................................................57
Figure 5.7-1 Battery Test timing diagram...............................................................................................58
Figure 5.8-1 Capacitor Test timing diagram ...................................................................................59
Figure 5.9-1 Sag and Swell Indices - IEEE 1159...................................................................................60

(1) Description of Operation 7SR224
Page 6 of 66 ©2009 Siemens Protection Devices Limited
LIST OF TABLES
Table 1-1: 7SR224 Ordering Options.......................................................................................................8
Table 2-1 Summary of Controller Relay Configurations ....................................................................10
Table 6-1 Operation Mode......................................................................................................................64
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]

(1) Description of Operation 7SR224
©2009 Siemens Protection Devices Limited Page 7 of 66
Section 1: Introduction
This manual is applicable to the following relays:
•7SR224 Directional Overcurrent and Directional Earth Fault Recloser Control Relay
The 7SR224 relay integrates the protection and control elements required to provide a complete
recloser control relay.
The ‘Ordering Options’ Tables summarise the features available in each model
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 fitted to relays, these may present a danger of electric shock or burns, if
touched.
1.3 FIBRE OPTIC COMMUNICATION
Where fibre optic communication devices are fitted, these should not be viewed directly. Optical
power meters should be used to determine the operation or signal level of the device.
1.4 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.
1.5 FRONT FASCIA
For safety reasons the following symbols are displayed on the fascia
!
!
!
!
!

(1) Description of Operation 7SR224
Page 8 of 66 ©2009 Siemens Protection Devices Limited
1 2 3 4 5 6 7 8 9 101112 13141516
ORDER-No.: 7SR224 -2 -0
||| ||||| ||||
Protection Product Family
5
|| ||||| ||||
Overcurrent - Directional 2|| ||||| ||||
|| ||||| ||||
Relay Type
6
| ||||| ||||
Recloser 4| ||||| ||||
| ||||| ||||
Case, I/O and Fascia 1)
7
|
|
|
|
|
|
|
|
|
E10 case, 4 CT, 6 VT, 13 Binary Inputs / 14 Binary Outputs, 8 LEDs + 12 keys 1||||| |
DA
|
E10 case, 4 CT, 4 VT, 13 Binary Inputs / 14 Binary Outputs, 8 LEDs + 12 keys 2||||| |
C
||
E10 case, 4 CT, 4 VT, 23 Binary Inputs / 22 Binary Outputs, 8 LEDs + 12 keys 3||||| |
C
||
E10 case, 4 CT, 4 VT, 33 Binary Inputs / 14 Binary Outputs, 8 LEDs + 12 keys 4||||| |
C
||
E10 case, 4 CT, 6 VT, 23 Binary Inputs / 22 Binary Outputs, 8 LEDs + 12 keys 5||||| |
DA
|
E12 case, 4 CT, 4 VT, 33 Binary Inputs / 14 Binary Outputs, 16 LEDs + 12 keys 6||||| |
C/E A
|
E12 case, 4 CT, 4 VT, 33 Binary Inputs / 30 Binary Outputs, 16 LEDs + 12 keys 7||||| |
C/E A
|
E12 case, 4 CT, 4 VT, 43 Binary Inputs / 22 Binary Outputs, 16 LEDs + 12 keys 8||||| |
C/E A
|
||||| ||||
Measuring Input
8
|||| ||||
1/5 A, 63.5/110V 2|||| ||||
|||| ||||
Auxiliary Nominal Voltage
9
||| ||||
30 to 220V DC, binary input threshold 19V DC 22W A||| ||||
30 to 220V DC, binary input threshold 88V DC 22W B||| ||||
||| ||||
Region Specific Functions
10
|| ||||
Region World, 50/60Hz, language English, Reyrolle fascia A|| ||||
Region World, 50/60Hz, language English, Siemens fascia B|| ||||
Region USA, 60/50Hz, language English - US (ANSI) (language changeable), Siemens fascia C|| ||||
|| ||||
Communication Interface
11
| ||||
Standard version - included in all models, USB front port, RS485 rear port 1| ||||
Standard version - plus additional rear F/O ST connectors (x2) and IRIG-B 2| ||||
Standard version - plus additional rear RS485 and IRIG-B 3| ||||
Standard version - plus additional rear RS232 and IRIG-B 4| ||||
| ||||
Protocol
12
||||
IEC 60870-5-103 0||||
IEC 60870-5-103 and Modbus RTU (user selectable setting) 1||||
IEC 60870-5-103 and Modbus RTU and DNP 3.0 (user selectable setting) 2||||
||||
Spare
13
|||
0|||
|||
Protection Function Packages
14
||
Standard version - included in all models C||
27/59 Under/overvoltage ||
27/59 Under/overvoltage, Sag/swell ||
37 Undercurrent ||
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 ||
59N Neutral voltage displacement ||
60CTS CT supervision ||
60VTS VT supervision ||
67/50 Directional instantaneous phase fault overcurrent ||
67/50G Directional instantaneous earth fault ||
67/51 Directional time delayed phase fault overcurrent ||
67/51G Directional time delayed earth fault ||
67/50HIZ Directional instantaneous sensitive earth fault ||
67/51HIZ Directional time delayed sensitive earth fault ||
74TC Trip circuit supervision ||
74BF Circuit breaker close fail ||
79 Autoreclose ||
81 Under/overfrequency ||
81HBL2 Inrush restraint ||
86 Lockout ||
Battery and capacitor test ||
Cold load pickup ||
Programmable logic ||
Standard version - plus D||
27/59 Under/overvoltage ||
60VTS VT supervision ||
Loop automation by loss of voltage ||
Standard version - plus E||
Single/triple pole autoreclose ||
||
Additional Functionality
15
|
No additional functionality A|
|
Settings File
16
Standard settings and standard labels for Siemens Recloser 0
Standard settings and standard labels for any third party Recloser 2
1) 4CT is confi
g
ured as 3PF + EF/SEF
(
user selectable settin
g)
.
6-8
1,5
Table 1-1: 7SR224 Ordering Options

(1) Description of Operation 7SR224
©2009 Siemens Protection Devices Limited Page 9 of 66
7SR224
46
BC
46
NPS
(x2)
37
(x2) 49 50 BF 51V
VL1
(VA)
VL2
(VB)
VL3
(VC)
V4
(VX)
IL1
(IA)
81
HBL
2
37
(x2) 49 50 BF 51V
IL2
(IB)
81
HBL
2
37
(x2) 49 50 BF 51V
IL3
(IC)
81
HBL
2
60
CTS
60
VTS
I4
(IG/ISEF)
74
TCS
(x3)
NOTE: The use of some
functions are mutually exclusive
67/
50
(x4)
67/
51
(x4)
67/
50
(x4)
67/
50
(x4)
67/
51
(x4)
67/
51
(x4)
64
H
27
59
27
59
(x4)
27
59
(x4)
27
59
(x4)
47
(x2)
79
59N
(x2)
Note:
Example shows
Voltage Config =
Van, Vbn, Vcn
81
(x4)
67/
50G
(x4)
67/
51G
(x4)
67/
50S
(x4)
67/
51S
(x4)
27S
59S
27S
59S
27S
59S
Batt
Test
Cap.
Test
Figure 1.5-1 Functional Diagram of 7SR224 Relay Showing Possible External Connections

(1) Description of Operation 7SR224
Page 10 of 66 ©2009 Siemens Protection Devices Limited
Section 2: Hardware Description
2.1 GENERAL
The structure of the relay is based upon the Multi-function hardware platform. The relays are supplied
in a size E10 or E12 case (where 1 x E = width of approx. 26mm). The hardware design provides
commonality between products and components across the Multi-function range of relays.
Table 2-1 Summary of Controller Relay Configurations
Relay Current
Inputs
Voltage
Inputs
Binary
Inputs
Output
Relays
LEDs Function
Keys
Case
7SR2241 4 6 13 14 8 12 E10
7SR2242 4 4 13 14 8 12 E10
7SR2243 4 4 23 22 8 12 E10
7SR2244 4 4 33 14 8 12 E10
7SR2245 4 6 23 22 8 12 E10
7SR2246 4 4 33 14 16 12 E12
7SR2247 4 4 33 30 16 12 E12
7SR2248 4 4 43 22 16 12 E12
Relays are assembled from the following modules:
1) Front Fascia with three fixed function LEDs, Function Keys and ordering options of configurable
LEDs.
2) Processor module.
3) Analogue Input module - 4 x Current + 4 or 6 x Voltage.
4) Power Supply (PSU) and Basic Binary Input (BI) and Binary Output (BO).
5) Binary Input/Output Module.
6) Data Comms module (optional)
2.2 CASE
The relays are housed in cases designed to fit directly into standard panel racks. The case has a width
of 260mm (E10), 312mm (E12) and a height of 177 mm (4U). The required panel depth for wiring
clearance is 242 mm and 287mm 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. Shorting contacts on the rear
connection block in the case ensure that the CT circuits remain short-circuited when the relay is
removed.
External connections to the rear terminal block are made via M4 screws. Each terminal can accept two
4mm crimps.

(1) Description of Operation 7SR224
©2009 Siemens Protection Devices Limited Page 11 of 66
Located at the top rear of the case is a screw clamp earthing point, this must be connected to the main
panel earth.
2.3 FRONT COVER
With the transparent front cover in place the user only has access to the READ DOWN ▼and
TEST/RESET►buttons, via blue push 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. The front
cover is used to secure the relay assembly in the case.
2.4 POWER SUPPLY UNIT (PSU)
The relay PSU can be directly connected to any dc supply via a suitably rated fuse from 30V dc to
220V dc.
In the event of the supply 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.
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 2.5-1 7SR224 with 12 Function Keys and 3 + 8 LEDs in E10 Case
NOTE: Transparent cover with pushbuttons not shown

(1) Description of Operation 7SR224
Page 12 of 66 ©2009 Siemens Protection Devices Limited
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.
Relay Information
Above the LCD three labels are provided, these provide the following information:
1) Product name and order code.
2) Nominal current rating, rated frequency, voltage rating, auxiliary dc supply rating, binary
input supply rating, configuration and serial number.
3) Blank label for user defined information.
A ‘template’ is available to allow users to create and print customised labels.
Liquid Crystal Display (LCD)
A 4 line by 20-character 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. A setting within the “SYSTEM CONFIG” menu allows the timeout to be adjusted from 1
to 60 minutes and “Off” (backlight permanently on). After an hour the display is completely de-
activated. 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.
‘PROTECTION 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.
‘PICKUP’ LED
This yellow LED is illuminated to indicate that a user selectable function(s) has picked up. The LED
will self reset after the initiating condition has been removed.
Functions are assigned to the PICKUP LED in the OUTPUT CONFIG>PICKUP CONFIG menu.
‘TRIP’ LED
This red LED is steadily illuminated to indicate that a user selectable function has operated to trip the
circuit breaker. Functions are assigned to the ‘Trip’ LED using the OUTPUT CONFIG>Trip Contacts
setting.
Operation of the LED is latched and 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).
Indication LEDs
Relays have either 8 or 16 user programmable LED indicators. Each LED can be programmed to be
illuminated as either green, yellow or red. Where an LED is programmed to be lit both red and green it
will illuminate yellow.
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 to allow users to create and print customised legends.

(1) Description of Operation 7SR224
©2009 Siemens Protection Devices Limited Page 13 of 66
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.
Standard Keys
The relay is supplied as standard with five navigation / control pushbuttons and 12 programmable
function keys. The navigation / control 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, BO and function keys can be accessed and set by
the user using these keys. Alternatively configuration/settings files can be loaded into the relay using
‘Reydisp’.
Function Keys/ LEDs
The 12 programmable function keys can be configured by the user to initiate selected functions from
the Control menu (INPUT CONFIG > FUNCTION KEY MATRIX).
Each programmable function key has an associated LED. These can be programmed as hand or self
reset and can be illuminated as green, yellow or red (OUTPUT CONFIG > LED CONFIG).
Function keys can be used with Quick Logic.
2.6 CURRENT INPUTS
Four current inputs are provided on the Analogue Input module. Terminals are available for both 1A
and 5A inputs.
Current is sampled at 32 samples per cycle (1600Hz) for both 50Hz and 60Hz system frequencies.
Protection and monitoring functions of the relay use either the Fundamental Frequency RMS or the
True RMS value of current appropriate to the individual function.
The waveform recorder samples and displays current input waveforms at 32 samples per cycle
(1600Hz).
2.7 VOLTAGE INPUTS
Four voltage inputs are provided on the Analogue Input module.
Voltage is sampled at 32 samples per cycle (1600Hz) both 50Hz and 60Hz system frequencies.
Protection and monitoring functions of the relay use fundamental frequency voltage measurement.
The waveform recorder samples and displays voltage input waveforms at 32 samples per cycle
(1600Hz).

(1) Description of Operation 7SR224
Page 14 of 66 ©2009 Siemens Protection Devices Limited
NB: The Relay has a flat frequency response measuring harmonic currents up to and including the
50th Harmonic but does not measure the content at the aliasing frequencies i.e. 800 Hz (16th
harmonic) + 1600 Hz (32nd harmonic) + 2400 Hz (48th harmonic).
2.8 BINARY INPUTS
The binary inputs are operated from a suitably rated dc supply.
Relays are fitted with 13, 33 or 43 binary inputs (BI) depending on the variant. The user can assign
any binary input to any of the available functions (INPUT CONFIG > INPUT MATRIX).
The Power Supply module includes the relay basic I/O incorporating 3 x BI and 6 x BO.
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 d.c. is applied. Inversion occurs before
the PU & DO time delay, see fig. 2.8-1.
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.
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,
e.g. '51-1 Inhibit'
BI 1 D/O Delay
BI nD/O Delay
INPUT
CONFIG>
BINARY
INPUT
CONFIG
Figure 2.8-1 Binary Input Logic

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©2009 Siemens Protection Devices Limited Page 15 of 66
2.9 BINARY OUTPUTS (OUTPUT RELAYS)
Relays are fitted with 14, 22 or 30 binary outputs. All outputs are fully user configurable and can be
programmed to operate from any or all of the available functions.
The Power Supply module includes the relay basic I/O. The module includes six binary outputs each
fitted with 1 contact – providing in total 1 x normally closed (NC), 2 x change-over (CO) and 3 x
normally open (NO) contacts.
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’. Alternatively, outputs can be programmed as ‘Pulsed’ outputs. When operated, these
outputs will reset automatically after a delay of the minimum operating time.
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.
When the relay is withdrawn from the case all normally closed contacts will be open circuited. This
should be considered in the design of the control and protection circuitry.
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. The relay will then reset and attempt to interrupt trip coil current flowing through an
output contact. Where this level is above the break rating of the output contact an auxiliary relay with
heavy-duty contacts should be utilised.in the primary system
Notes on Hand Reset Outputs
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.

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Figure 2.9-1 Binary Output Logic
2.10 VIRTUAL INPUT/OUTPUTS
The relays have 16 virtual input/outputs, these are internal logic states. Virtual I/O is assigned in the
same way as physical Binary Inputs and Binary Outputs. Virtual I/O is mapped from within the INPUT
CONFIG > INPUT MATRIX and OUTPUT CONFIG > OUTPUT MATRIX menus.
2.11 SELF MONITORING OF THE CONTROLLER
The relay incorporates a number of self-monitoring features. Each of these features can initiate a
controlled reset recovery sequence.
Supervision includes a power supply watchdog, code execution watchdog, memory checks by
checksum and processor/ADC health checks. When all checks indicate the relay is operating correctly
the ‘Protection Healthy’ LED is illuminated.
If an internal failure is detected, a message will be displayed; also an event will be generated and
stored. The relay will reset in an attempt to rectify the failure. This will result in de-energisation of any
binary output mapped to ‘protection healthy’ and flashing of the protection healthy LED. If a successful
reset is achieved by the relay the LED and output contact will revert back to normal operational mode,
and the relay will restart.
2.11.1 Protection Healthy/Defective
When the relay has an auxiliary DC supply and it has successfully passed its self-checking procedure
then the front facia Protection Healthy LED is turned on.
A normally open contact can be mapped via the binary output matrix to provide an external protection
healthy signal.
A normally closed contact can be mapped via the binary output matrix to provide an external
protection defective signal. With the ‘Protection Healthy’ this contact is open. When the auxiliary DC
supply is not applied to the relay or a problem is detected within the relay then this output contact
closes to provide external indication.
A shorting contact in the case at positions 25-26 of the PSU module can be used to provide an
external indication when the relay is withdrawn.

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©2009 Siemens Protection Devices Limited Page 17 of 66
2.12 BATTERY AND CAPACITOR TEST FACILITY OF THE RECLOSER
The quiescent battery voltage VAUX is constantly monitored to ensure that the charging system is
connected and operating correctly. The capacitor voltage is monitored externally by the Switch Unit
Driver and Monitor. The healthy condition of the capacitor is indicated to the Controller by the state of
two binary signals. These signals are constantly monitored and used to provide alarms and operation
blocking for quiescent capacitor voltage levels which are out of limits.
Battery and capacitor tests are initiated at user set intervals - typically once per week/month. The
condition and state of the Recloser battery and Recloser capacitor are assessed; any unhealthy states
are identified and can be alarmed. Battery and capacitor tests are not carried out at the same time.
The battery test is initiated first to avoid any possible interaction with the capacitor test which is
performed 30 minutes afterwards.

(1) Description of Operation 7SR224
Page 18 of 66 ©2009 Siemens Protection Devices Limited
Section 3: Protection Functions
3.1 CURRENT PROTECTION:PHASE OVERCURRENT (67, 51, 50)
All phase overcurrent elements have a common setting to measure either fundamental frequency
RMS or True RMS current:
True RMS current: 51/50 Measurement = RMS
Fundamental Frequency RMS current: 51/50 Measurement = Fundamental
3.1.1 Directional Control of Overcurrent Protection (67)
The directional element produces forward and reverse outputs for use with overcurrent elements.
These outputs can then be mapped as controls to each shaped and instantaneous over-current
element.
If a protection element is set as non-directional then it will operate independently of the output of the
directional detector. However, if a protection element is programmed for forward directional mode then
operation will occur only for a fault lying within the forward operate zone. Conversely, if a protection
element is programmed for reverse directional mode then operation will occur only for a fault lying
within the reverse operate zone. Typically the forward direction is defined as being ‘away’ from the
busbar or towards the protected zone.
The Characteristic angle is the phase angle by which the polarising voltage must be adjusted such
that the directional detector gives maximum sensitivity in the forward operate zone when the current is
in phase with it. The reverse operate zone is the mirror image of the forward zone.
Voltage polarisation is achieved for the phase-fault elements using the quadrature voltage i.e. at unity
power factor I leads V by 90°. Each phase current is compared to the voltage between the other two
phases:
IL1 ~ V23 IL2 ~ V31 I L3 ~ V12
The characteristic angle can be user programmed to any angle between -95°and +95°using the 67
Char Angle setting. The voltage is the reference phasor (Vref) and the 67 Char Angle setting is added
to this to adjust the forward and reverse zones.
The centre of the forward zone is set by (Vref Angle + 67 Char Angle) and should be set to correspond
with Ifault Angle for maximum sensitivity i.e.
For fault current of -60°(I lagging V by 60°) a 67 Char Angle of +30°is required for maximum
sensitivity (i.e. due to quadrature connection 90°- 60° = 30°).
OR
For fault current of -45°(I lagging V by 45°) a 67 Char Angle of +45°is required for maximum
sensitivity (i.e. due to quadrature connection 90°- 45° = 45°).
Two-out-of-three Gate
When the 67 2-Out-Of-3 Logic setting is set to Enabled, the directional elements will only operate for
the majority direction, e.g. if IL1 and IL3 are detected as forward flowing currents and IL2 is detected as
reverse current flow, phases L1 and L3 will operate forwards, while phase L2 will be inhibited.

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Minimum Polarising Voltage
The 67 Minimum Voltage setting defines the minimum polarising voltage level. Where the measured
polarising voltage is below this level no directional output is given and operation of protection elements
set as directional will be inhibited. This prevents mal-operation under fuse failure/MCB tripped
conditions where noise voltages can be present.
Figure 3.1-1 Logic Diagram: Directional Overcurrent Element (67)

(1) Description of Operation 7SR224
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3.1.2 Instantaneous Overcurrent Protection (50)
Four elements are provided e.g. giving the option of using two elements set to forward and two to
reverse.
Each instantaneous element (50-n) has independent settings. 50-n Setting for pick-up current and 50-
n Delay follower time delay. The instantaneous elements have transient free operation.
For the directional elements the direction of operation can be set using 50-n Dir. Control setting.
Directional logic is provided independently for each 50-n element.
Operation of the instantaneous overcurrent elements can be inhibited from:
Inhibit 50-n A binary or virtual input, or function key.
79 P/F Inst Trips: 50-n When ‘delayed’ trips only are allowed in the auto-reclose
sequence (79 P/F Prot’n Trip n = Delayed).
50-n Inrush Action: Inhibit Operation of the inrush current detector function.
50-n VTS Action: Inhibit Operation of the VT Supervision function.
Figure 3.1-2 Logic Diagram: Instantaneous Over-current Element