南宁变电站电容器组跳闸及其处理

Problem-solving for Capacitor Banks Tripping in Nanning Substation

摘要: 500 kV南宁变电站在启动过程中，手动投入3号变低压侧两台电容器组后，电容器组端电压越限跳闸。文章通过对本站500 kV电压控制曲线、主变绕组额定电压、电容器投入后容升效应及电压整定值等因素的分析，说明了在正常运行方式下，3号变低压侧仅可投入一组电容器。结合运行单位的需求，分析了减少单组电容器组容量的改造方案，及改造后电容器投入条件，并校验了改造后谐振和谐波情况。最后就以上问题对具体技术和设计管理提出了建议。

Abstract: During the start of Nanning substation, the capacitor banks at No.3 main transformer's low voltage side tripped for voltage off-normal , when putting into use manually.The paper analyzed the 500 kV voltage control curve, rated voltage of low voltage winding, voltage rise capacitance, capacitive rise effect, voltage setting value, etc, proved that only one capacitor bank at No.3 main transformer's low voltage side could be put into use in the normal conditions. With the demand of operation department, the paper analyzed the modification scheme to reduce one set of capacitor bank's capacitance and the condition of the modified capacitor banks putting into use, resonance and harmonic were also verified. Finally, the paper provided suggestions on technology and design management aim to above problems.