基于概率地震需求分析的750 kV-SF₆罐式断路器耦联体系地震易损性模型

As the hub of power system,the seismic performance evaluation of substation is particularly important,and the tank circuit breaker coupling system is one of the important equipment in substation.In order to study the seismic performance of 750 kV-SF₆tank circuit breaker coupling system,incremental dynamic analysis(IDA)and probabilistic seismic demand model(PSDM)were used to evaluate its seismic vulnerability.Firstly,the structural characteristics and seismic loss characteristics of 750 kV-SF₆tank circuit breaker coupling system are analyzed,and the finite element model is constructed.Based on the incremental dynamic analysis(IDA),the peak ground acceleration(PGA)is used as the input parameter to obtain the seismic response of the key vulnerable parts.On this basis,the seismic vulnerability curves of each vulnerable part under different seismic damage states are generated by probabilistic seismic demand model(PSDM).Finally,based on the reliability theory,the seismic vulnerability model of 750 kV-SF₆can circuit breaker coupling system is obtained.The results show that when PGA reaches 0.6g,the failure probability of 750 kV-SF₆tank circuit breaker coupling system is 0%,1%～5%,88%～93% and 100%,respectively.