The distributing characteristics of sediment deposited on pin-type grading electrodes in inner cooling circuit of HV converter valve

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) Pub Date : 2014-08-01 DOI:10.1109/ICACACT.2014.7223592

Chenxing Wang, Xuezhong Liu, Xianrong Wang, Ning Liu, Xiuying Jiao, Y. Tan

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引用次数: 9

Abstract

Inorganic sediments frequently deposit on the pin-type grading electrodes installed in the inner cooling circuits for high voltage converter valves. This investigation focuses on the distributing characteristics of deposited sediments. Field data have been collected from three ±500kV converter stations. Sediment distributions corresponding to different valve tower structures are summarized. The relationships between sediment thickness and electrode locations in both horizontal and vertical components of converter valve are analyzed. The chemical compositions of field-collected sediment samples are analyzed by means of energy dispersive spectrometer (EDS). Electrical insulating properties of the samples are measured. The results indicate that the deposition degree of the sediment is mainly dominated by the electrical current through the pin-type grading electrode. The electronegative sediment particles tend to deposit on the grading electrodes with positive polarity. The deposited sediment is mainly composed of aluminum oxide compounds and may impact the uniform effect of the grading electrode.

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高压换流阀内冷却回路针式分级电极上沉积物的分布特征

安装在高压换能阀内冷却回路中的针式分级电极上经常有无机沉积物沉积。本次研究的重点是沉积沉积物的分布特征。现场数据采集于3座±500kV换流站。总结了不同阀塔结构对应的沉积物分布。分析了换流阀水平组件和垂直组件中沉积物厚度与电极位置的关系。利用能谱仪对野外采集的沉积物样品进行了化学成分分析。测量了样品的电绝缘性能。结果表明:沉积物的沉积程度主要由通过针型分级电极的电流决定;电负性沉积物颗粒倾向于沉积在极性为正的分级电极上。沉积的沉积物主要由氧化铝化合物组成，可能影响分级电极的均匀效果。

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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2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014)

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