Simulation study for analysis of online dielectric measurement problems on transformer insulation system

Yang, Xu, Ledwich, Gerard, & Nielsen, Shawn (2014) Simulation study for analysis of online dielectric measurement problems on transformer insulation system. Lecture Notes in Mechanical Engineering, 2015, pp. 657-665.

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Abstract

Determining the condition as well as the remaining life of an insulation system is essential for the reliable operation of large oil-filled power transformers. Frequency-domain spectroscopy (FDS) is one of the diagnostic techniques used to identify the dielectric status of a transformer. Currently, this technique can only be implemented on a de-energized transformer. This paper presents an initial investigation into a novel online monitoring method based on FDS dielectric measurements for transformers. The proposed technique specifically aims to address the real operational constraints of online testing. This is achieved by designing an online testing model extending the basic “extended Debye” linear dielectric model and taking unique noise issues only experienced during online measurements into account via simulations. Approaches to signal denoising and potential problems expected to be encountered during online measurements will also be discussed. Using fixed-frequency sinusoidal excitation waveforms will result in a long measurement times. The use of alternatives such as a chirp has been investigated using simulations. The results presented in the paper predict that reliable measurements should be possible during online testing.

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ID Code: 75947
Item Type: Journal Article
Refereed: Yes
Additional Information: Special issue for the 7th World Congress on Engineering Asset Management (WCEAM 2012)
Keywords: Operating procedures, Materials treatment, Innovation/technology management, Engineering economics
DOI: 10.1007/978-3-319-06966-1_59
ISSN: 2195-4356
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 by Springer International Publishing, Switzerland
Deposited On: 08 Sep 2014 04:05
Last Modified: 11 Sep 2014 05:19

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