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I agree with alehman, 1ms asymmetry in communication will cause 1x360/50=18 degree difference in phase angle.

Ground transformer is used to provide a source of ground fault current during line to ground faults, limit the magnitude of transient overvoltage when restriking ground fault occurs and permit the connection of phase to neutral load. There are several type of ground transformer such as Zig-zag...

It seems to me that magnitude of the transient recovery voltage (TRV) and/or rate of rise of recovery voltage (RRRV) exceed the breakers's capability. My 1. Generally speaking it is ok but in your case, You should do simulation to check TRV and RRRV of these breakers. Does the breaker fail on...

jghrist and saltan, your information are very helpful for me. Thank you very much!

I am looking for standards or programs for flexible conductor tension calculation in substations. Any comments will be appreciated. Thanks