电压切换箱自动并列方法研究

Method for Voltage Switching Box Automatically Paralleled

常规的电压切换箱并列回路只能手动切换,即手动将并列把手打到并列位置,强制连通两段母线电压。但频繁操作切换把手则可能导致节点接触不良,而且并列的时间过长时会引起两台电压互感器的环流。极端情况下可能导致并列回路不能正常工作,引起电压二次回路断线,闭锁保护,计量表计将失去计量,影响着电网的安全稳定运行。为了减少PT并列回路因控制把手或辅助节点故障引起的PT失压,保证二次设备和系统的安全稳定运行,对电压切换箱自动并列回路的可行性进行了深入探讨。

The conventional voltage switch box paralleled loop could only be manually switched, that is , manually make the handle reaching the paralleled position, force the connectivity of two busbar voltage. However,frequent operation of switching handle may cause the node to poor contaction, and paralleled for too long will cause the circulation of the two voltage transformers. It may lead to a paralleled loop which does not work properly in extreme cases, causes voltage secondary loop disconnection, blocking protection, metering meters will lose measurement, impacting the safe and stable operation of the grid.