Abstract: This paper presents a method to measure the capacitance current of neutral point through the parallel damping grounding system of arc suppression coil, which is convenient to realize the tracking and tuning of arc suppression coil. By changing the neutral grounding resistance, the amplitude and phase angle of the current flowing through the neutral before and after the change of the neutral grounding resistance are measured, and the system mismatch degree is calculated by the amplitude and phase angle of the current measured twice, so as to calculate the current value of the system to the ground capacitance. The accuracy of the method is verified by building a model in MATLAB. The simulation shows that the method can effectively measure the current value of the ground capacitance, the acquisition quantity is easy to obtain, and the calculation accuracy meets the requirements. It provides a theoretical basis for the tracking and tuning of the arc suppression coil based on the measured current.

Key words: neutral point through current, ground capacitive current, zero sequence current, Matlab

摘要： 对中性点经消弧线圈并联阻尼接地系统，提出了一种测量对地电容电流的方法，便于实现消弧线圈跟踪调谐。该方法通过改变中性点接地电阻，测量改变中性点接地电阻前后流过中性点的电流的幅值和相角，通过两次测量到的电流的幅值和相角计算系统失协度，从而计算系统对地电容电流值。在Matlab中搭建模型验证方法准确性，仿真表明该方法可以有效实现对地电容电流值的测量，采集量容易获取，计算精度满足要求，为消弧线圈跟踪调谐提供一种基于测量电流的理论依据。

关键词: 中性点通过电流, 对地电容电流, 零序电流, Matlab