Siemens 7SR21 Manual

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7SR21 & 7SR22 Argus 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.
©2010 Siemens Protection Devices Limited
7SR21 Non-Directional
7SR22 Directional
Overcurrent Relay
Document Release History
This document is issue 2010/05. The list of revisions up to and including this issue is:
2010/05 Additional Comms modules option of (RS485 + IRIG-B) and (RS232 + IRIG-B) and
typographical revisions
2010/02 Document reformat due to rebrand
2009/09 Third Issue. Software revision 2435H80004/5 R4b-4
2008/07 Second issue. Software revision 2435H80004/5 R3d-3.
2008/03 First issue
Software Revision History
2009/09 2435H80004/5 R4b-4 CTS-I Supervision. Undercurrent 37G & 37SEF. Vx U/O
Voltage. 46BC U/C. Comms Settings. Waveform Storage
Settings. Fault Storage Settings. Energy Storage. Trip test
function. Local/Remote modes. Settings ranges extended.
Protocol changes.
2008/07 2435H80004/5R3d-3 Demand records. Optional DNP3.0 data comms.
2008/03 2435H80004/5R2c-2b First Release