110kV扩大内桥接线方式二次电压切换回路探讨

针对110kV扩大内桥接线运行方式的切换导致主变压器高压侧二次电压失压的问题,通过对宁夏电网现有110kV变电站内桥接线中2号主变压器高压侧二次电压切换回路设计进行分析,提出一种2个继电器配合的改进的二次电压切换回路。应用结果表明:该改进回路能够有效防止2号主变压器高压侧二次电压失压,保障主变安全稳定运行,减少电网企业和用户的经济损失。

Discussion on secondary voltage switching loop with 110 kV expanded inner-bridgeconnection mode

Aiming at the problem of the 110 kV expanded inner- bridge connection mode switchingleading to the secondary voltage loss at the high voltage side of No.2 main transformer, analyzes the design of secondary voltage switching loop at high voltage side of No.2 main transformer withexpanded inner- bridge connection mode in 110 kV transformer substations of Ningxia power grid,puts forward an improvement switching loop which has two relays to coordinate switching. Theapplication result shows that the improvement switching loop can effectively prevent the secondaryvoltage loss of No.2 main transformer, ensure the safe and stable operation of the main transformer andreduce the economic loss of the power grid enterprises and customers.