Characterization of Surface Roughness of HVDC Transmission Lines in Ion Flow Field Models

被引：0

作者：

Chen B. ^{[1
]}

Lu T. ^{[1
]}

Xu P. ^{[1
]}

Wang D. ^{[1
]}

Li X. ^{[1
]}

机构：

[1] Beijing Key Laboratory of High Voltage and EMC, North China Electric Power University, Beijing

来源：

Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Corona initial voltage; HVDC; Ion flow field; Surface roughness; Wire;

D O I：

10.13336/j.1003-6520.hve.20190410011

中图分类号：

学科分类号：

摘要：

The corona discharge of HVDC transmission lines can generate ion flow field. The surface roughness of HVDC transmission line increases because of the sand blown by the wind and friction, which leads to the decrease of the corona initial voltage. Therefore, the surface micro-geometry of a transmission line has a direct effect on the ion flow field. In this paper, wire samples with different roughness were treated with sand particles to simulate the influence of sand blown by wind on transmission lines. Based on the light sectioning, the micro morphology of surface of a wire sample was analyzed, and the roughness of wire samples was obtained. The electric field of wire surface with different surface micro geometry was calculated by FEM. When the roughness increases, the maximum electric field of the wire surface will increase, and the number of spiked protrusions will increase. Moreover, the initial voltage of corona of a wire sample was measured by a corona cage method. The correlation between surface roughness of wire and roughness coefficient in Peek formula was established. As the roughness increases, the roughness factor will decrease. The correlation is applied to the ion flow field calculation. Furthermore, the roughness coefficient was characterized by the measured surface roughness to ensure the expression of the micro-geometry of the wire surface more reliable. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：1443 / 1450

页数：7

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