由瞬态引起的电容器故障的仿真和保护策略分析

Study of Simulation and Protection Strategy of Capacitor Faults Induced by Electric Transients

电力系统的电能质量可能会影响电容器的正常运行,其中比较重要的影响来自于瞬态电压变化。从瞬态事件发生的原点开始,瞬态造成的影响将在馈线上的任一方向传播,甚至会影响到变压器中电容或电感的耦合程度,从而减低系统的性能。针对易引起电容器故障的电力系统瞬态事件进行仿真。首先建立电力电容器在频域下的模型,然后将模拟的10kV电力电容器应用到变电站中,同时仿真研究瞬态事件在不同系统运行状况下对电容器的影响,最后提出电容器保护的建议和措施。

The power quality of power systems may affect the normal operation of capacitors. One important influence comes from transient voltage changes. From the origin of the transient event, it will propagate in either direction on the feeder, and even affect the coupling of the capacitor or inductor in the transformer, thus reducing the performance of the system. In this paper, power system transient events which will cause capacitor failure are simulated mainly. Firstly, the model of the power capacitor in the frequency domain is established. Then the simulated 10kV power capacitor is applied to the substation. At the same time, the influence of the transient event on the capacitor under different system operating conditions is simulated. Finally, the capacitor protection suggestions and measures are proposed in this paper.