电压互感器接线错误影响系统单相接地时的正确判断

Correction of Voltage Transformer Wiring Error Affects System Single-phase Grounding

电压互感器二次回路接线错误,小而言之,会引起熔丝熔断、异常情况时误判断,严重情况时会造成电压互感器烧毁、区内故障时保护拒动,而区外故障时保护误动事故,影响电网的正常运行,因此,在工程安装、二次回路改接线等各种情况下,都要确保接线的正确性,防止事故的发生。然而在现实当中,由于接线时不细心、不按规程操作、试验不全等因素,造成接线错误而发生事故或异常情况屡见不鲜。

The secondary circuit of the voltage transformer is incorrectly wired. In a short case, it will cause the fuse to be blown, and the abnormal condition will be misjudged. In severe cases, the voltage transformer will be burnt, the protection in the area will be rejected, and the fault will be caused. Protection of accidents and accidents affects the normal operation of the power grid. Therefore, in the case of engineering installation, secondary circuit wiring and various conditions, it is necessary to ensure the correctness of the wiring and prevent accidents. However, in reality, due to wiring It is not uncommon for accidents or abnormalities to occur due to improper wiring, improper operation, and incomplete testing. The following is a case of a 110 kV substation, hoping to help the relevant workers.