谐振电网接地点残流的算法

The Algorithm of Residual Current at the Grounding Point in Resonance Grid

中性点谐振接地系统发生单相接地故障时，流过接地点的残余电流不得超过10A。工程上认为流过接地点的电感电流与电容电流相位差为180度，传统的残流算法是电感电流减电容电流，存在较大误差。本文针对单相接地的谐振电网，推导出了残流的计算公式，运用此计算公式比工程上传统算法准确得多，这对于合理地确定消弧线圈或自动跟踪补偿消弧装置的补偿容量具有实际意义。

When there＇ s a single phase-to-ground fault in neutral point resonance grounded system, the residual current at the grounding point should not exceed IOA. It＇s generally accepted the phase difference between inductive current and capacitive current is 180 degrees. Since there are errors in traditional algorithm, the author provides a more accurate formula, which is effective in determining the compensation capacity of arc-compression coil and automatic tracking compensation arc suppression devices.