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Estimation of de-trapped charge for diagnosis of transformer insulation using short-duration polarisation current employing detrended fluctuation analysis
High Voltage ( IF 4.4 ) Pub Date : 2020-04-22 , DOI: 10.1049/hve.2019.0348
Saurabh Dutta 1 , Deepak Mishra 1 , Arijit Baral 1 , Sivaji Chakravorti 2
Affiliation  

Researchers have shown that the value of charge carriers, de-trapped from the oil–paper interface of power transformer insulation, is useful in carrying out the diagnosis. However, the evaluation of the de-trapped charge requires the analysis of polarisation–depolarisation currents. Being an off-line time-consuming process, the measurement and analysis of polarisation and depolarisation current (PDC) data are not practically advantageous. The study presents a detrended fluctuation analysis-based technique to estimate the magnitude of normalised de-trapped charge using the polarisation current measured for a short duration. Using the proposed technique, the requirement of measuring the complete PDC data, for diagnosis purposes, can be eliminated. Further, the technique also eliminates the requirement of depolarisation current which in turn facilitates a reduction in equipment shutdown time. The applicability of the proposed technique is tested on the data obtained from several real-life power transformers.



中文翻译:

基于趋势波动分析的短时极化电流估计用于变压器绝缘的去俘获电荷的估计

研究人员表明,从电力变压器绝缘的油纸界面捕获的电荷载流子的价值可用于进行诊断。但是,对去俘获电荷的评估需要分析极化-去极化电流。作为离线耗时的过程,极化和去极化电流(PDC)数据的测量和分析在实践中并不具有优势。该研究提出了一种基于去趋势波动分析的技术,该技术使用短时测量的极化电流来估计归一化去俘获电荷的大小。使用提出的技术,可以消除出于诊断目的而测量完整的PDC数据的需求。进一步,该技术还消除了去极化电流的需求,从而有利于减少设备停机时间。所提出的技术的适用性在从数个现实生活中的电力变压器获得的数据上进行了测试。

更新日期:2020-04-22
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