Table 7.

Peak value of switching overvoltage across circuit breaker S1 in double-sided ring topology.

Mitigation method	TRV (kV)
	Phase A	Phase B	Phase C
Without mitigation	17.550	42.330	53.850
With PIR	6.418	20.460	25.736
With R–C	15.073	32.751	40.295
With choke coil R–L	4.885	15.452	19.551
With surge capacitor	16.844	37.832	47.237