三相单柱式电压互感器高压一相断线电压分析

Analysis of One Phase Disconnection Voltage under High Voltage of Three-phase Single-column Voltage Transformer

在变电站运行中,三相单柱式电压互感器高压一相断线的情况时有发生。对于断线相绕组的电压,有些观点默认为是零,也有观点给出了电压不为零的现场数据。然而,这个电压等于零或不等于零的原因,一直被困扰着。对此,文章分析了电压互感器绕组的连接状态,推导出关联公式,发现了只有在特殊条件下断线相绕组电压才会等于零,在其它条件下这个电压不会等于零的理论依据。

In a substation, the event of one phase disconnection voltage under high voltage of three-phase single-column voltage transformer occurs from time to time.For the voltage of the broken-phase winding, some articles default to zero while some articles presents the field data whose voltage is not zero.However,none of them give the reason why this voltage is equal to zero or not.Therefore, this paper has analyzed the connecting station of the voltage transformer winding and elicited the correlation formula.And it found the theoretical basis that the disconnection phase winding voltage wilt not be zero under other conditions. be zero under special conditions, and the voltage will