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A Novel Universal Approach for Temperature Correction on Frequency Domain Spectroscopy Curve of Transformer Polymer Insulation

1
College of Electrical Engineering, Guangxi University, Nanning 530004, China
2
School of Physical and Technology, Guangxi University, Nanning 530004, China
3
Electric Power Research Institute of Guangxi Power Grid Co., Ltd., Nanning 530023, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(7), 1126; https://doi.org/10.3390/polym11071126
Received: 22 May 2019 / Revised: 11 June 2019 / Accepted: 14 June 2019 / Published: 2 July 2019
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Abstract

It is a fact that the frequency domain spectroscopy (FDS) curve at different temperatures can be corrected by the shift factor (αT) extracted from the master curve. However, the αT and master curve reported by previous works are distinctive due to the difference in the construction algorithm. Therefore, it is of great significance to report a universal approach for extracting αT. In this work, the unaged oil-immersed pressboards with different moisture content (mc%) are firstly prepared and selected as the research specimen. Then, the αT of FDS curves on the above pressboard is extracted based upon the master curve technique. The influence mechanism under the various test temperature (T) and mc% is therefore analyzed so as to establish a universal model for predicting the αT. The present findings reveal that the αT value extracted from FDS curves is both temperature-dependent and moisture-dependent. In addition, the predicted αT is not only suitable for temperature correction on FDS curve of same type pressboard with different insulation conditions (moisture contents and aging degrees), but also maintains considerable accuracy when applied to different types of pressboard. Therefore, the obtained conclusions will provide a universal method for temperature correction on FDS curve of transformer polymer insulation. View Full-Text
Keywords: transformer polymer insulation; frequency domain spectroscopy (FDS); shift factor (αT); master curve technique; temperature correction transformer polymer insulation; frequency domain spectroscopy (FDS); shift factor (αT); master curve technique; temperature correction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liu, J.; Fan, X.; Zhang, Y.; Zheng, H.; Yao, H.; Zhang, C.; Zhang, Y.; Li, D. A Novel Universal Approach for Temperature Correction on Frequency Domain Spectroscopy Curve of Transformer Polymer Insulation. Polymers 2019, 11, 1126.

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