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7SG163 Ohmega 300 Series
7SG163 Protection Relay
Document Release History
This document is issue 2012/01. The list of revisions up to and including this issue is:
Pre release
2010/02
Document reformat due to rebrand
2012/01
Figure 1 terminal numbering corrected
Software Revision History
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.
©2012 Siemens Protection Devices Limited
7SG163 Ohmega 300 Series SingleDEF
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Summary of Contents for Siemens 7SG163 Ohmega 300 Series
- Page 1 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.
- Page 2 7SG163 Ohmega 300 Series SingleDEF Contents 1 Introduction............................3 2 DEF Direction and Characteristic Angle..................3 DEF Schemes ........................... 4 2.1.1 DEF Direct Trip ......................... 4 2.1.2 DEF POR .......................... 4 2.1.2.1 Current Reversal Guard ....................4 2.1.2.2 CB Echo ........................
- Page 3 7SG163 Ohmega 300 Series SingleDEF 1 Introduction. High resistance earth faults present difficulties to impedance measuring elements since resistive coverage required can often extend beyond the apparent impedance presented by maximum load conditions. In those cases a directional earth fault element can be used to supplement the basic distance protection.
- Page 4 7SG163 Ohmega 300 Series SingleDEF 2.1 DEF Schemes There are two active schemes for the relay. 2.1.1 DEF Direct Trip In the DEF Direct Trip mode, the relay will trip on detecting an earth fault in the set direction. The DEF element is time graded, and may be set to standard IEC or ANSI Curves or as a DTL element.
- Page 5 7SG163 Ohmega 300 Series SingleDEF 3 Relay Settings 3.1 DEF Auxiliary Protection S ttings. DEF Protection - Allows the DEF Element to be enabled or disabled DEF Active Scheme - Active scheme may be set as either DEF POR or DEF Direct trip. For more details on these schemes see part 2.1 of this section.