Experimental investigations of improved dielectric condition monitoring methods on transformer oil-paper insulation system

Yang, X., Nielsen, S., & Ledwich, G. (2014) Experimental investigations of improved dielectric condition monitoring methods on transformer oil-paper insulation system. In IEEE 18th International Conference on Liquid Dielectrics (ICDL 2014), 30 June - 3 July 2014, Bled, Slovenia.

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Frequency Domain Spectroscopy (FDS) is successfully being used to assess the insulation condition of oil filled power transformers. However, it has to date only been implemented on de-energized transformers, which requires the transformers to be shut down for an extended period which can result in significant costs. To solve this issue, a method of implementing FDS under energized condition is proposed here. A chirp excitation waveform is used to replace the conventional sinusoidal waveform to reduce the measurement time in this method. Investigation of the dielectric response under the influence of a high voltage stress at power frequency is reported based on experimental results. To further understand the insulation ageing process, the geometric capacitance effect is removed to enhance the detection of the ageing signature. This enhancement enables the imaginary part of admittance to be used as a new indicator to assess the ageing status of the insulation.

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ID Code: 78590
Item Type: Conference Paper
Refereed: Yes
Keywords: Dielectric measurement, FDS, Energized insulation system, Imaginary admittance, Geometric effects component
DOI: 10.1109/ICDL.2014.6893101
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 IEEE
Deposited On: 11 Nov 2014 23:19
Last Modified: 12 Nov 2014 23:59

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