Surface Discharge Behaviour of Coated Electrodes in Gas-Insulated Systems Under DC Voltage Stress

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI:10.1109/CEIDP.2018.8544892

T. Götz, D. E. Moghadam, J. Speck, K. Backhaus, T. Gabler, S. Grossmann, P. Simka, U. Riechert

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引用次数: 3

Abstract

Due to the increasing usage of renewable energy sources, it is necessary to transmit electrical energy over long distances. Apart from traditional AC interconnection, High-Voltage direct current (HVDC) links provide an economic option to transport bulk energy. Especially on offshore platforms it is beneficial to use gas-insulated substations (GIS) due to the saline atmosphere and the limited space available. Considering technical and economic aspects, it is advantageous to use DC-GIS on those platforms. The constant electrical field in DC-GIS may lead to charge accumulation on gas-solid interfaces - e. g. on the interface between the low-conductive electrode coatings and SF6• Previous investigations revealed that this charge carrier accumulation can lead to surface discharges on coated electrodes which may reduce the dielectric strength of the whole insulation system. In order to understand these phenomena comparative experiments with low and high conductive electrode coatings were performed.

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直流电压应力下气体绝缘系统中涂层电极的表面放电行为

由于越来越多地使用可再生能源，有必要远距离传输电能。除了传统的交流互联之外，高压直流(HVDC)链路为输送大量能源提供了一种经济的选择。特别是在海洋平台上，由于大气含盐且可用空间有限，使用气体绝缘变电站(GIS)是有利的。从技术和经济的角度考虑，在这些平台上使用DC-GIS是有利的。DC-GIS中的恒定电场可能导致气固界面(例如低导电电极涂层与SF6之间的界面)上的电荷积累。先前的研究表明，这种载流子积累会导致涂层电极的表面放电，从而降低整个绝缘系统的介电强度。为了理解这些现象，进行了低导率和高导率电极涂层的对比实验。

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

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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