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

This is an open access article published by the IET and CEPRI under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 26/11/2019, Accepted 22/04/2020, Revised 11/04/2020, Published 22/04/2020

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.

Inspec keywords: polarisation; charge measurement; paper; electric current measurement; transformer oil; fluctuations; power transformer insulation

Other keywords: normalised detrapped charge; detrended fluctuation analysis-based technique; oil-paper interface; real-life power transformers; power transformer insulation; PDC data; short-duration polarisation current; polarisation-depolarisation currents; charge carriers; off-line time-consuming process

Subjects: Current measurement; Organic insulation; Transformers and reactors; Charge measurement

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