[Ahmad]

A ring of transformers supplied from main substation using 2 feeders. The main substation feeding from 15MVA transformer.
A ring of transformers supplied from main substation using 2 feeders. The main substation feeding from 15MVA transformer. We decided to chang the supply from main substatin to another one witch feeding from 5MVA transformer. How can we changing the setting of the incoming feeders?

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[Hamid]

Below figure shows a simple ring main, with a single infeed at Bus A and three load busbars which I think is very close to your system conceptually. I transfer this example from ALSTOM PROTECTIVE RELAYS APPLICATION GUIDE in here; you can try to new setting calculation with following this example. Settings for the directional relays R2- R7 and non-directional relays R1/R8 are required. Maximum load current in the ring is 785A (maximum continuous current with one transformer out of service), so 1000/1A CT

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