Space charge dynamics in oil-paper insulation under the combination influence of moisture and temperature

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI:10.1109/ICHVE.2012.6357110

J. Hao, R. Liao, Lijun Yang

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引用次数: 6

Abstract

The main insulation system in HVDC transformer consists of oil-paper insulation. The formation of space charge in oil/paper insulation system can not only affect the dielectric strength, but also relate to the stability and security of HVDC transformer. Moisture and temperature has detrimental effect on the electrical breakdown strength and insulation life of oil-paper insulation. Thus a better understanding the combination influence of the moisture and temperature on the charge distribution in multi-layer oil-paper insulation system becomes increasingly practical importance. In the present study, the space charge dynamics in three layers oil-paper insulation system with three different moisture concentrations (0.28%, 1.32% and 4.96%) under 15 °C and 55 °C were investigated using the PEA technique under 20 kV/mm . The combination influence of the moisture and temperature on the charge distribution in multi-layer oil-paper insulation system was provided. Results show that the higher the moisture content and the temperature of the oil-paper sample, the higher the mobility of the trapped charges in the sample, and the more obvious the positive charge injection and negative charge injection were observed.

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水分和温度共同影响下油纸绝缘的空间电荷动力学

高压直流变压器的主绝缘系统由油纸绝缘组成。油/纸绝缘系统中空间电荷的形成不仅影响绝缘强度，而且关系到高压直流变压器的稳定性和安全性。湿度和温度对油纸绝缘的电气击穿强度和绝缘寿命有不利影响。因此，更好地了解温度和湿度对多层油纸绝缘系统电荷分布的综合影响就变得越来越具有实际意义。在20 kV/mm条件下，采用PEA技术研究了15°C和55°C条件下，3种不同含水率(0.28%、1.32%和4.96%)的三层油纸绝缘系统的空间电荷动力学。给出了温度和湿度对多层油纸绝缘系统电荷分布的综合影响。结果表明，油纸样品的含水率和温度越高，样品中被困电荷的迁移率越高，正电荷注入和负电荷注入现象越明显。

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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2012 International Conference on High Voltage Engineering and Application

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