回复电压法在变压器故障诊断中的应用

作为一种可用于电力变压器及电力电缆状态监测的非破坏性诊断工具之一,回复电压法正被广泛开展研究,该方法可提高检测绝缘系统中含水量及老化程度的能力,并能够表征绝缘状况及老化状态。基于回复电压法原理,利用油浸纸板进行极化现象研究,为解释其内在机理,引入扩展德拜模型,并在不同电路参数条件下,得到了不同的仿真结果,同时,在试验室内针对不同老化程度的试样进行回复电压试验,综合试验结果及理论分析,建立了极化与老化之间的关系。

Application of Recovery Voltage Measurement in Fault Diagnosis of Oil-immersed Transformer

One of the methods currently being investigated as a possible non-intrusive diagnostic tool for condition monitoring of power transformer and cable is the recovery voltage measurement, which will be improving the ability of detecting the content of water concentration and the ageing process in the insulation system and may thus be an indicator of insulation quality and its ageing status. The polarization phenomenon is studied using RVM with oil-paper samples. In order to interpret its mechanism, the Extended Debye model was introduced. With different circuit parameters, various simulation results are obtained. Furthermore, with the test samples in different ageing conditions, measurements are accomplished in the lab. On the basis of this experiment as well as theoretical analysis, correlations between polarizations and ageing are analyzed.