Estimation of de-trapped charge for diagnosis of transformer insulation using short-duration polarisation current employing detrended fluctuation analysis

High Voltage

Saurabh Dutta¹  Arijit Baral¹  Deepak Mishra¹  Sivaji Chakravorti² 

[1] Indian Institute of Technology (ISM);Jadavpur University;

关键词: power transformer insulation;    paper;    transformer oil;    fluctuations;    electric current measurement;    polarisation;    charge measurement;    charge carriers;    oil-paper interface;    power transformer insulation;    off-line time-consuming process;    detrended fluctuation analysis-based technique;    pdc data;    real-life power transformers;    short-duration polarisation current;    polarisation-depolarisation currents;    normalised detrapped charge;   

DOI  :  10.1049/hve.2019.0348

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown