Online Measurement Method for Surface Charges of Basin Insulators Based on the Capacitive Electrostatic Probe

IF 1.3 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Iet Science Measurement & Technology Pub Date : 2025-07-25 DOI:10.1049/smt2.70022

Jiayi Liu, Xiaoqing Xie, Feng Wang, She Chen, Qiuqin Sun, Lipeng Zhong, Zhiyong Hu, Xianhao Fan, Fangwei Liang

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Abstract

Operation voltage is disconnected before measuring surface charges on gas-insulated transmission line (GIL) insulators (i.e., offline measurement). However, the spontaneous dissipation of surface charges reduces the accuracy. In this paper, the input aperture, the diameter, and the height of sensitive electrodes are optimised by the measurement model of electrostatic probes. The electric field distribution, induced potential, and spatial resolution of probes are analysed. The results indicate that the radius of the input aperture and the height of sensitive electrodes should exceed 3 and 11 mm, respectively, to avoid the shielding effect of the grounded shell. Furthermore, the maximum electric field on the sensitive electrode surface reduces with increased diameters. However, there is a positive correlation with heights. Therefore, the radius of the input aperture is 4 mm. The height and the diameter of sensitive electrodes are 12 mm and 1.6 mm, respectively. For ±320 kV GIL basin insulators, the induced potential distribution measured by probes matches the surface charge, and the spatial resolution is 1091mm². This shows that capacitive electrostatic probes are suitable for the online measurement of surface charges on basin insulators, which provides a reference for the prevention of flashovers resulting from surface charge accumulation on DC GIL insulators.

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基于电容式静电探针的盆状绝缘子表面电荷在线测量方法

在测量气体绝缘输电线路（GIL）绝缘子表面电荷（即离线测量）之前，断开操作电压。然而，表面电荷的自发耗散降低了精度。本文利用静电探针测量模型对敏感电极的输入孔径、直径和高度进行了优化。分析了探针的电场分布、感应电位和空间分辨率。结果表明，为避免接地壳的屏蔽作用，输入孔径半径应大于3 mm，敏感电极高度应大于11 mm。此外，敏感电极表面的最大电场随直径的增加而减小。然而，与身高呈正相关。因此，输入孔径半径为4mm。敏感电极的高度为12mm，直径为1.6 mm。对于±320 kV GIL盆状绝缘子，探针测量的感应电位分布与表面电荷分布吻合，空间分辨率为1091mm2。这说明电容式静电探针适用于盆状绝缘子表面电荷的在线测量，为防止直流GIL绝缘子表面电荷积聚引起的闪络提供了参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Iet Science Measurement & Technology 工程技术-工程：电子与电气

CiteScore

4.30

自引率

7.10%

发文量

审稿时长

7.5 months

期刊介绍： IET Science, Measurement & Technology publishes papers in science, engineering and technology underpinning electronic and electrical engineering, nanotechnology and medical instrumentation.The emphasis of the journal is on theory, simulation methodologies and measurement techniques. The major themes of the journal are: - electromagnetism including electromagnetic theory, computational electromagnetics and EMC - properties and applications of dielectric, magnetic, magneto-optic, piezoelectric materials down to the nanometre scale - measurement and instrumentation including sensors, actuators, medical instrumentation, fundamentals of measurement including measurement standards, uncertainty, dissemination and calibration Applications are welcome for illustrative purposes but the novelty and originality should focus on the proposed new methods.