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SEL 279

SEL 279

(OP)
I am in the process of setting an SEL 279 relay.  Does anyone know any good rules of thumb for the 25D setting?  I have seen ranges from 17 cycles to 120 cycles.  The setting is developed from a formula in the SEL manual that depends on "slip frequency" and "closing angle".  Please help.

RE: SEL 279

The adjust of 25D is very easy. Here you have a example;
25DV =21 V
25DT =50 Cycles
system 50 Hz, 400 kV.
 




Melquiades
Protective Relay
Testing and Commissioning

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