电压二次回路异常对保护动作的原理分析

Protection Action Principle of Voltage Secondary Circuit Anomaly

电压互感器二次电压回路接线正确对保护装置正常运行至关重要,结合某变电站保护误动实例,建立接地故障等值电路模型,从原理上分析电压二次回路异常对纵联零序方向保护产生的影响,并提出该类型故障的处理和预防措施。

The correct wiring of vohage transformer secondary voltage circuit is essential for the normal operation of protector. Combined with an instance of the protector maloperation in a substation malfunction, the ground fault equivalent circuit model is established, the influence of voltage secondary circuit anomaly on longitudinal zero sequence direction protection is analyzed from the principle, and this type of failure treatment and preventive measures are put forward.