Investigations of dielectric monitoring on an energised transformer oil–paper insulation system

Yang, Xu, Nielsen, Shawn, & Ledwich, Gerard (2014) Investigations of dielectric monitoring on an energised transformer oil–paper insulation system. IET Science, Measurement and Technology, 9(1), pp. 102-112.

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Frequency domain spectroscopy (FDS) is being used to assess the insulation condition of oil–paper power transformers. However, it has to date only been implemented on de-energised transformers, which requires the transformers to be shut down for an extended period and may cause significant costs. To solve this issue, a newly improved monitoring method based on the FDS principle is proposed to implement the dielectric measurement on energised transformers. Moreover, a chirp waveform excitation and its novel processing method are introduced. Compared with the conventional FDS results, dielectric results from the energised insulation system have higher tanδ values because of the increased losses. To further understand the insulation ageing process, the effects of the geometric capacitance are removed from the measured imaginary admittance of the insulation system to enhance the ageing signature. The resulting imaginary admittance is then shown to correlate well with the central time constant in return voltage measurements results. The proposed methods address the issues on techniques used on energised transformers and provide a clue for on-line FDS diagnostic application.

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ID Code: 75893
Item Type: Journal Article
Refereed: Yes
Additional Information: Available online: 24 July 2014
Keywords: Insulation ageing process, Waveform analysis, Frequency-domain analysis, Condition monitoring, Spectroscopy
DOI: 10.1049/iet-smt.2013.0127
ISSN: 1751-8830
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 02 Sep 2014 23:14
Last Modified: 18 Mar 2015 21:33

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