含水量和温度对变压器油介电性能的影响

Effects of Moisture and Temperature on Dielectric Properties of Transformer Oil

变压器油是油浸式电力变压器中重要的液体绝缘介质,水分是除温度以外影响变压器绝缘最重要的因素之一。搭建了高温高压介电谱测试系统,应用频域介电谱法研究不同含水量和温度下变压器油的相对介电常数和介损因数随频率的变化规律;根据测试数据进一步推导直流电导率,得到了含水量、温度与直流电导率之间的定量关系,为变压器油的含水量诊断提供依据。

Transformer oil is the important liquid insulating dielectric of oil-immersed power transformer.With the exception of temperature,moisture is considered to be one of the most important factors of influence on the transformer insulation.This paper established the high temperature and high voltage dielectric spectroscopy test system and studied on the dependence of frequency on relative permittivity and dielectric loss factor of transformer oil with different moisture content and temperature,based on the frequency domain spectroscopy(FDS)method.According to the test data,the direct current(DC)conductivity was further deduced,and the quantitative relationship among moisture content,temperature and DC conductivity was obtained to provide the basis for the diagnosis of moisture content of transformer oil.