母线电压互感器空气开关选型和回路改进探讨  

Discussion on the Air Switch Selection of the Bus Voltage Transformer and the Circuit Improvement

作　　者：陈亮 温才权 王健丰 CHEN Liang;WEN Caiquan;WANG Jianfeng(Wuzhou Bureau,CSG EHV Power Transmission Company,Guangxi Wuzhou 543002,China)

机构地区：[1]南方电网超高压输电公司梧州局

出　　处：《广西电力》2019年第6期64-67,共4页Guangxi Electric Power

摘　　要：针对一起双母线接线方式的母线在倒闸操作过程中发生的反充电事故进行分析,计算出反充电电流值范围,发现该事故中母线电压互感器空气开关延时6 s动作的主要原因是空气开关的磁脱扣动作电流选择过大。为了确保空气开关可靠动作并减小故障影响范围,本文提出在电压互感器下级支路增设空气开关,增设的空气开关与原电压互感器空气开关根据反充电电流值进行选型后,二者动作相互配合,确保了反充电时支路空气开关跳开将隔离故障,同时不影响母线电压互感器空气开关的运行。An inverse charging accident that happened during the switching operation process of a bus which has the dual-bus connection mode is analyzed and the range of the inverse charge current value is calculated. It is found that the main reason of the 6 s delay action of the air switch of the bus voltage transformer in the accident is that the magnetic tripping action current value selected is too large in the air switch. In order to ensure the reliable operation of the air switch and reduce the fault influence range, the addition of an air switch at the lower sub-branch of the voltage transformer is proposed. After the selection of the added and the original air switches of the voltage transformer according to the inverse charging current value actions of them will cooperate with each other to ensure that the sub-branch air switch isolates the fault during inverse charging without affecting the operation of the air switch of the bus voltage transformer.

关 键 词：双母线接线方式 母线电压互感器 反充电 空气开关 

分 类 号：TM451[电气工程—电器]