迎丰桥变电站电容器组频繁跳闸原因分析

针对220 kV迎丰桥变电站10 kV II-IC 324、II-3C 330电容器间隔由于不平衡电压引起断路器频繁跳闸,对其电容器组进行电容量检测。并对超标相电容器进行单个电容量测试。结果发现:电容量超标导致放电线圈二次不平衡电压达到7.56 V,超过设定的不平衡电压保护定值3V从而引起报警,应更换电容量不合格的电容器,使三相电容量平衡,以消除不平衡电压。

Analysis on Frequent Tripping of Capacitor Bank at Ying Feng Qiao Substation

As for frequent tripping of circuit breaker due to imbalance voltage of 10 kV II-IC 324#、II-3C 330# capacitor bay at 220 kV Ying Feng Qiao substation,the capacitance on the capacitor bank is measured,and individual capacitance measurement is carried out on the phase of capacitor exceeding the rated value.It is found by the result: the capacitance value over the rating results in the secondary imbalance voltage of discharge coil rising to 7.56 V,which exceeding the protection fixed value(3 V) and leading to alarm.The capacitor with disqualified capacitance shall be replaced to keep three-phase capacitance balance and to eliminate imbalance voltage.