It offers steps of the secondary circuit to avoid miss operation when the alternating voltage losing, especially a measure to improve the double busbar voltage switch circuit with two position relay.
介绍了PT断线的几种情况 ,分析PT断线的判据 ,提出二次回路防止失压误动的措施 ,重点介绍了采用双位置继电器改进双母线电压切换回路的措