In the multi-circuit transmission line with shunt reactor

during the non-full-phase operation caused by line fault

since the series reactor circuit may be formed between the shunt reactor and the line capacitor

a high-amplitude resonant over-voltage will occur for a long time.The research on the resonance problem of the multi-circuit transmission line on the same tower with shunt reactor is studied.The coupling model of the multi-circuit transmission line on the same tower is established

and the equivalent impedance model of the resonant loop of each fault state during the non-full-phase operation is obtained.The calculation expression of the resonant frequency under various fault conditions of the line is derived

and the correctness of the theoretical analysis is verified by the frequency sweep.For the more intuitive reaction between the shunt reactor and the multi-circuit transmission line resonance of the same tower

the resonance relationship curve between the shunt reactor compensation degree and the neutral point small reactance is made

combined with the neutral point small reactance value requirement

for multiple times.Comparative analysis of line resonance characteristics of different numbers of lines.The research results have reference value for the study of the resonance law of shunt reactors in the same tower multi-circuit transmission line.