一种消弧线圈调谐新方法的研究

摘要

提出了一种中性点经消弧线圈接地的电容电流测量新方法.先用极值法进行粗调谐,当发生谐振时,测量可以得到零序电压与B、C间线电压的夹角,然后利用此时零序电压与不平衡电压的相位关系,可以求得不平衡电压与B、C间线电压的夹角,任意改变电感后,很容易得到此时零序电压与不平衡电压的夹角.根据谐振等值回路可以快速求出电容上的电压,进而可快速求出对地电容和对地电阻.最后,在MATLAB中进行了仿真论证,这种方法限制条件少、操作简单可靠、精确度高,与传统的调谐方法相比,具有明显的优势.%Based on neutral-point earthling by arc suppression coil; the paper puts forward a new method of capacitance current measurement. Firstly; extremes method is used for the coarse tuning; the angle between zero sequence voltage and B; C line voltage can be measured when resonance occurs. Then; according to the phase relationship of zero sequence voltage and unbalance voltage; the angle between unbalance voltage and B; C line voltage can be calculated. After changing the inductance arbitrarily; the different angle between unbalance voltage and zero sequence voltage can be calculated easily. According to the resonant equivalent circuit; the capacitance voltage can be calculated quickly; capacitance and resistance will be acquired easily. Lastly; The method is demonstrated in MATLAB; it features few limitations; easy and reliable-operation and high precision. Compared with traditional tuning methods; the new method has the obvious advantages.