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6～35千伏的高压电网为中性点不接地系统。当发生单相接地故障时,接地电流引起的电弧有可能烧损电机铁芯,而另外两相对地的电压将由相电压升高至线电压。(相电压的3~(1/2)倍)。如不及时排除,有可能使高压设备的绝缘击穿,造成相间短路而导致故障扩大。因此,一般变电所内均安装用于接地检测的三相五柱电压互感器。故障时,由其开口三角绕组产生的零序电压使讯号装置动作而发出接地警告,由值班人员凭经验和猜测逐盘拉闸,以确断故障所在。这样,经常会使正常线
6 ~ 35 kV high-voltage power system for the neutral ungrounded system. When a single-phase ground fault occurs, the arc caused by the ground current may burn the motor core, and the other two opposite voltages will increase from the phase voltage to the line voltage. (3 ~ (1/2) times of phase voltage). If not ruled out in time, it is possible to make high-voltage equipment insulation breakdown, resulting in short-circuit between the phase lead to the failure to expand. Therefore, the general substation are installed for three-phase five-post ground fault detection voltage transformer. Fault, the zero-sequence voltage generated by the opening of the triangular winding so that the signal device action issued a ground warning, on duty by virtue of experience and speculation by slash brake to determine where the fault. This will often make the normal line