Method of Power-Frequency Interval-Wave for Measurement of Large Grounding Systems

2021 IEEE 4th International Electrical and Energy Conference (CIEEC) Pub Date : 2021-05-28 DOI:10.1109/CIEEC50170.2021.9510773

Haocheng Wang, Xuan Zhang, Yang Tian, Zhiqiang He, Xiaohui Hu, Zhuohong Pan

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Abstract

The measurement of grounding impedance has a high requirement for the instrument. In this paper, a method of measuring the power frequency interval wave of large-scale grounding device is proposed, which is studied from three aspects: principle, implementation and field application. The interval wave method outputs the interval voltage signal of power frequency through synchronous high-speed acquisition and power electronic switch, and then removes the influence of field noise by forward and backward difference of adjacent cycle signal. The noise of different types of strong interference is measured in the field, and the denoise performance of the interval wave method is analyzed by simulation. The application of the interval wave method in the measurement of the grounding impedance of a 500kV substation is realized, and the effectiveness of the method is proved by comparing with the different frequency method. The research results of this paper provide a reference for the lightening and intelligence of grounding impedance measurement equipment.

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大型接地系统工频间隔波测量方法

接地阻抗的测量对仪器有很高的要求。本文提出了一种测量大型接地装置工频间隔波的方法，从原理、实现和现场应用三个方面进行了研究。区间波法通过同步高速采集和电力电子开关输出工频区间电压信号，然后利用相邻周期信号的前后差分去除场噪声的影响。在现场测量了不同类型强干扰的噪声，并通过仿真分析了间隔波法的降噪性能。实现了间隔波法在500kV变电站接地阻抗测量中的应用，并通过与不同频率法的比较，证明了该方法的有效性。本文的研究成果为接地阻抗测量设备的轻量化和智能化提供了参考。

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2021 IEEE 4th International Electrical and Energy Conference (CIEEC)

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