水分对电力变压器油纸绝缘的影响研究  

Study on the Influence of Moisture on Oilpaper Insulation of Power Transformer

作　　者：赵建利[1] 张鹏[1] 侯英洒 李洁[2] 

机构地区：[1]内蒙古电力科学研究院,内蒙古呼和浩特010000 [2]内蒙古科技大学信息工程学院,内蒙古包头014000

出　　处：《自动化仪表》2016年第4期31-35,41,共6页Process Automation Instrumentation

摘　　要：为研究水分对电力变压器油纸绝缘系统的影响情况,在实验室中分别制备了绝缘纸和绝缘油样品进行极化去极化电流(PDC)测试,在时域分析样品绝缘状况;通过极化电导率将测试结果转换为复介电常数,在频域分析样品绝缘状况。以直流电导率为中间量进行推导,得出水分的测量公式,并进行实验验证。结果表明,PDC实验结果通过转化能在时域和频域反映样品的绝缘状况,并可以相互验证。通过开展直流电导率测试试验,进一步验证水分推导公式的正确性,为水分测量提供新思路。In order to research the influence of moisture on oilpaper insulation system of power transformer,the samples of insulation paper and insulation oil are prepared in the laboratory to carry out the polarization current and depolarization current（ PDC） tests,and the insulation condition of samples is analyzed in the time domain. The test results are conversed into complex permittivity constant by polarization conductivity,to analysis the insulation condition in the frequency domain. Taking the DC conductivity as the intermediate quantity,the measurement formula of moisture is derived and the experimental verification is conducted. The result shows that by converting,the PDC experimental results can reflect the insulation condition of samples in time domain and frequency domain,and can be verified by each other. The correctness of the moisture derived formula can be verified in further by develop the test of DC conductivity.

关 键 词：电力变压器 绝缘 去极化电流 水分 电导率 数据分析 时域 频域 

分 类 号：TH86[机械工程—仪器科学与技术] TP202[机械工程—精密仪器及机械]