750 kV GIS变电站开关操作电磁暂态特性研究

Study on Electromagnetic Transient Characteristics During Switching Operation of 750 kV GIS Substation

为明确气体绝缘开关设备(gas insulated switchgear,GIS)开关操作过程中的电磁暂态特性。在某750 kV气体绝缘变电站投运期间,设计了测量方案对隔离开关单次闭合、断路器单次闭合两类操作下的瞬态外壳电压(transient enclosure voltage,TEV)与暂态地电位升高(transient ground potential rise,TGPR)进行了测量,并对两类操作的测量结果从宏脉冲和微脉冲特性方面进行了对比分析。结果表明:TEV和TGPR的最大值分别为22.8 kV和19.6 kV,在许多测点处TGPR均高于TEV;相比于断路器合闸操作,隔离开关合闸操作产生的电磁振荡能量小,但宏脉冲持续时间长、击穿次数多。

For clarifying the electromagnetic transient characteristics during the switching operation of gas insulated switchgear(GIS),the measurement scheme is designed to measure the transient enclosure voltage(TEV)and the transient ground potential rise(TGPR)under such two types of operations as single close operation of disconnector and circuit breaker during the operation of one 750 kV GIS.And the measurement results of the two types of operations are compared and analyzed from the macro-pulse and micro-pulse characteristics aspects.The results show that the maximum values of TEV and TGPR are 22.8 kV and 19.6 kV,respectively,and TGPR is higher than TEV at many measuring points.Compared to the closed operation of circuit breaker,the electromagnetic oscillation energy generated by the closed operation of disconnector is small,but the duration of macro pulse is long and number of breakdown is more.