某110kV变电站并联电容器故障分析与对策研究

Fault Analysis and Countermeasure Research on Shunt Capacitor of 110 kV Substation

针对某110 kV变电站10 kV母线安装的并联无功补偿电容器组由于高次谐波的存在而频繁损坏的问题,分析了两组串联电抗率不同的并补装置可能发生谐振的谐波次数,并结合案例研究了电抗率的选取以避开谐振点,确保并补装置安全运行。应用ETAP软件进行仿真,仿真结果表明滤波效果明显,达到预期降低10 kV母线谐波含量的目标。

In allusion to the problem of frequently damaged shunt reactive power compensation capacitor group installed in the 10 kV bus of the 11 0 kV substation because of the existing of ultraharmonics,this paper analyzed the harmonic orders of possibly happened resonance in two groups of shunt reactive power compensation devices with different reactance rate in series and combined with cases to research on the selection of reactance rate to ensure the safe operation of shunt reactive power compensation devices.The simulation result based on ETAP software shows that there is obvious filtering effect,which reaches the goal to reduce the 10 kV bus harmonic content.