Method for Reducing Impulse Grounding Impedance of Grounding Device by Using Grounding Electrode with Non-uniform Radius

2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE) Pub Date : 2020-09-06 DOI:10.1109/ICHVE49031.2020.9279521

Zhuoran Liu, Sen Wang, Bo Zhang, Yanchuan Cao, Donghui Luo, Wei Li

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引用次数: 1

Abstract

Reducing the transient grounding impedance of the grounding device is an important measure for lightning protection. However, due to the inductive reactance of the grounding electrode, the transient grounding impedance is usually very high. This paper analyzes the parameters that affect the inductive reactance of the grounding electrode, and studies the influence of the electrode radius on the inductive reactance. Considering the cost and the effective current leakage length of the grounding electrode, a method of reducing the transient grounding impedance is proposed. That is using a piece of grounding electrode with large radius near the current injection point of the grounding device, and then gradually reducing the radius along electrode. The effectiveness of the method is verified by numerical simulation, and the optimal arrangement is analyzed. It can be seen that the method can greatly increase the effective current leakage length of the grounding electrode and reduce the transient grounding impedance of the grounding device.

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采用非均匀半径接地电极降低接地装置冲击接地阻抗的方法

降低接地装置的瞬态接地阻抗是防雷的重要措施。但是，由于接地电极的感抗，瞬态接地阻抗通常很高。分析了影响接地电极感应抗的参数，研究了电极半径对感应抗的影响。考虑到成本和接地电极的有效漏电流长度，提出了一种降低暂态接地阻抗的方法。即在接地装置的电流注入点附近使用一块半径较大的接地电极，然后沿电极逐渐减小其半径。通过数值模拟验证了该方法的有效性，并对最优布置进行了分析。由此可见，该方法可以大大增加接地电极的有效漏电流长度，降低接地装置的瞬态接地阻抗。

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2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)

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