7SR242 Duobias Description Of Operation
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(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
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While the information and guidance given in this document is believed to be correct, no liability shall be accepted
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negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
7SR242 Duobias
Multi-Function 2-Winding Transformer Protection Relay
Document Release History
This document is issue 2010/06. The list of revisions up to and including this issue is:
2010/06 Additional Comms modules option of (RS485 + IRIG-B) and (RS232 + IRIG-B) and typographical
revisions
2010/02 Document reformat due to rebrand
2010/02 Third issue. Software revision 2662H80001 R4c-3
2008/07 Second issue. Software revision 2662H80001R3d-2c.
2008/05 First issue
Software Revision History
2010/02 2662H80001 R4c-3 Revisions to: VT ratio settings, 87BD 1
st
bias slope limit setting
increments, CB fail function, LED CONFIG menu, DATA
STORAGE menu.
Added: Open circuit detection (46BC), CONTROL MODE
menu, Close circuit supervision (74CCS), Measured earth fault
undercurrent (37G), Pulsed output contacts.
2008/07 2662H80001R3d-2c. Demand metering. Optional DNP3.0 data comms.
2008/05 2662H80001R3-2b First Release
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