特高压GIL接入对断路器瞬态恢复电压的影响

特高压气体绝缘金属封闭输电线路(GIL)的接入对断路器瞬态恢复电压(TRV)幅值和瞬态恢复电压上升率(RRRV)均会产生影响，可能危及断路器开断能力。文中基于同塔双回特高压交流架空线-双回GIL混合输电线路，利用EMTP-ATP仿真研究变电站内断路器端部发生三相短路故障时，GIL长度、接入位置与GIL引接站测量设备对断路器TRV幅值和RRRV的影响。仿真结果表明，GIL的接入对断路器TRV幅值和RRRV有较大影响；GIL长度增加对TRV幅值产生较大影响，但对RRRV影响较小；为了限制RRRV，应将GIL安装在架空线中段，且应安装金属氧化物避雷器 (MOV)限制TRV幅值；GIL引接站测量设备对断路器TRV幅值和RRRV影响均较小。文中研究成果可为含GIL的特高压线路中断路器的TRV计算及参数设计提供参考。

Influence of UHV GIL access on transient recovery voltage of circuit breaker

The access of ultra high voltage (UHV) gas-insulated transmission line (GIL) affects both the transient recovery voltage (TRV) amplitude and the rate of rise of TRV (RRRV) of circuit breakers,which may endanger the breaking capacity of circuit breakers. Based on the double-circuit UHV accurate current (AC) overhead line on the same tower and the double-circuit GIL hybrid transmission line,EMTP-ATP simulation is used to study the influence of GIL length,access position and GIL lead station measurement equipment on the TRV amplitude and RRRV of the circuit breaker when a three-phase short-circuit fault occurs at the end of the circuit breaker in the substation. The simulation results show that the access of the GIL has a greater impact on the TRV amplitude and RRRV of the circuit breaker. The increase in the length of the GIL has a greater impact on the TRV amplitude,but the impact on RRRV is small. In order to limit the RRRV,the GIL should be installed in the middle of the overhead line,and the metal oxide varistor (MOV) should be installed to limit the TRV amplitude. The measurement equipment of the GIL terminal station has little effect on the TRV amplitude and RRRV of the circuit breaker. The research results can provide a reference for the TRV calculation and parameter design of circuit breakers in UHV lines with GIL.