【摘要】 介绍了针对上河变电站几次 5 0 0 k V隔离开关操作引起的 40 0 V操作电源端子箱内熔丝熔断事件进行的现场试验。试验结果表明 ,隔离开关操作时 ,由于 5 0 0 k V串内连接线和 40 0 V电源线间存在电磁耦合 ,在40 0 V操作电源供电母线上有较高的感应电压存在。为降低感应电压 ,提出了铺设屏蔽电缆或暂时在电源母线上并联电容器的解决方案更多还原

【Abstract】 Test was made at site to investigate several accidents of fuse broken in 400 V operating power supply terminal box occurred during operation of 500 kV disconnector. The high inductive voltage existed in 400 V power supply bus line indicated by the test result during the operation of the disconnector is due to the electromagnetic coupling existing between 500 kV high voltage line and 400 V power supply line. To reduce the inductive voltage, shielded cable should be laid, or capacitor should be paralleled to power supply line temporarily.更多还原