交直流电压下油纸绝缘典型缺陷的局部放电特征
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作者单位:

1.国网宁夏电力有限公司电力科学研究院;2.长沙理工大学电气与信息工程学院

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TM863

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)国家自然科学基金青年基金项目(51407013)


Partial discharge characteristics of typical defects in oil paper insulation under AC and DC voltage
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1.State Grid Ningxia Electric Power Co,Ltd Electric Power Research Institute;2.Changsha University of Science and Technology,School of Electrical and Information Engineering

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    摘要:

    油纸绝缘局部放电问题受到业内普遍关注,为探究在交直流复合电压下的局部放电特征,本文在对此问题的研究过程搭建了测量平台,并设计了气隙放电、悬浮放电、柱板沿面放电和针板放电四种油纸绝缘典型缺陷的放电模型。结合这四种局部放电的的实验结果,经分析后发现:四种典型缺陷局部放电会在不同的复合电压比例下发生不同的变化,前三种缺陷起始阶段平均放电量与直流分量呈现负向变化的特征,与局放起始电压的关系是正向变化特征。与其他三种典型缺陷相比较,悬浮绝缘放电模型在交直流混合电压下局部放电的起始电压明显增加,交流电压下的平均放电量降低。所得结果为利用局部放电试验判别换流变缺陷类型和电压形式对局放的影响提供了基础数据。

    Abstract:

    The problem of oil-paper insulation partial discharge has attracted widespread attention in the industry. In order to explore the characteristics of partial discharge under AC-DC composite voltage, this paper built a measurement platform during the research process of this problem, and designed air gap discharge, suspension discharge, and cylindrical surface discharge. Discharge models of four types of typical defects of oil-paper insulation. Combining the experimental results of these four kinds of partial discharges, after analysis, it is found that the partial discharges of the four typical defects will change differently under different composite voltage ratios, and the average discharge amount and DC component of the first three defects at the initial stage are negative. The relationship between the characteristic of forward change and the initial voltage of partial discharge is a positive change characteristic. Compared with the other three typical defects, the initial voltage of partial discharge in the suspended insulation discharge model under AC and DC mixed voltage is obviously increased, and the average discharge under AC voltage is reduced. The results obtained provide basic data for the use of partial discharge tests to determine the effect of the type of commutation transformer defect and the voltage form on the partial discharge.

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  • 收稿日期:2020-11-11
  • 最后修改日期:2020-11-20
  • 录用日期:2020-12-07
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