特定频率的谐波下，并联电容器与系统发生并联谐振，放大谐波电流，影响电容器及系统的正常工作。分析了一起由并联电容器发生并联谐振引起的电容器组串联电抗器烧毁事故，根据对象变电站实际参数与事故现场采集数据，给出系统相应运行方式下的谐振区间，通过仿真计算阐述了电容器投切对5次谐波的放大影响，并针对该变电站的串联电抗器参数设定提出了改进措施。%Under the harmonic waves of specific frequency, the paralel resonance happened between the shunt capacitor and the system, which mag-nified the harmonic currents and had impacts on the capacitors and the regular work of the system. This paper analyzed a burnout failure of capacitor bank series reactor caused by paralel resonance happened in the shunt capacitors. According to the actual parameters of the object transformer substa-tion and the data colection on site of accident, this paper gave the resonance zones under different operation modes, expounded the amplification impact of capacitor switching on 5-th subharmonics and proposed the improvement measures set for series reactor parameters of this transformer substation.
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