翻译：考虑仅需判断零序CT的极性正确性本文对式4的暂态项衰减过程进行简化近似认为电容器的充电过程非常短暂近似为经历一个采样间隔即衰减完。该简化处理不影响对零序冲击电流极性的判断经过简化处理第2、3次的零序冲击过程的数学模型变得更简单便于工程计算。

Considering only the polarity correctness of the zero-sequence CT, this article simplifies the transient attenuation process of equation (4) and approximates that the capacitor charging process is very brief, experiencing only one sampling interval before attenuation is complete. This simplification does not affect the determination of the polarity of the zero-sequence impulse current. After simplification, the mathematical models of the second and third zero-sequence impulse processes become simpler and more suitable for engineering calculations.