交直流复合电压下的稍不均匀场高压电极起晕特性

发布时间：2018-06-06 17:10

本文选题：复合电压 + 阀用屏蔽罩缩尺模型　；参考：《高电压技术》2017年09期

【摘要】：为研究复合电压下阀内部屏蔽罩电极的起晕电压特性,搭建了用稍不均匀电场电极缩尺模拟阀用屏蔽罩电极,并搭建了复合电压电极电晕放电平台,基于紫外成像技术研究了稍不均匀场中阀用屏蔽罩电极缩尺模型的紫外光子数特性及起晕电压特性,并获得了不同电极尺寸下的起晕电压的变化规律。在此基础上,利用有限元方法对不同交直流配比下,电晕起始电场强度分布进行了仿真。通过分析可以得到:气隙间距在0~10 cm范围内,在固定直流改变交流的复合升压方式下,随着正直流分量的增加,电极所加交流分量会逐渐降低,若认为起晕时交直流分量直接线性叠加得到的电压为起晕电压,则起晕电压值会随正直流分量的增加呈现先增加后降低的趋势,存在一组交流和直流电压配比,使得复合电压作用下电极的起晕电压达到峰值,数值可达65 k V左右。该研究可以为换流阀内电极结构的绝缘优化设计提供参考。
[Abstract]:In order to study the halo voltage characteristics of the inner shield electrode of the valve under the compound voltage, a slightly uneven electric field electrode scale was built to simulate the shielding cover electrode for the valve, and a corona discharge platform of the composite voltage electrode was built. Based on the ultraviolet imaging technique, the ultraviolet photons and halo voltage characteristics of the electrode scale model of the shield cover for valve in slightly inhomogeneous field are studied, and the variation of the corona voltage under different electrode sizes is obtained. On this basis, the initial electric field intensity distribution of corona under different AC / DC ratios is simulated by finite element method. Through analysis, it can be concluded that the AC component of the electrode decreases with the increase of the positive DC component when the air gap spacing is within the range of 0 ~ 10 cm, and under the fixed DC changing AC compound boost mode, the AC component of the electrode decreases gradually with the increase of the positive DC component. If it is considered that the voltage of direct linear superposition of AC / DC component is the starting voltage, the corona voltage will increase first and then decrease with the increase of the positive DC component, and there is a group of AC and DC voltage ratio. Under the action of compound voltage, the corona voltage of the electrode reaches the peak value, and the value can reach about 65 kV. This study can be used as a reference for the insulation optimization design of the internal electrode structure of the converter valve.
【作者单位】：华北电力大学新能源电力系统国家重点实验室;国网冀北电力有限公司电力科学研究院;中国南方电网科学研究院;
【基金】：国家自然科学基金(51277065)~~
【分类号】：TM721.1

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