Original scientific paper

Acoustic localisation of partial discharge in power transformers

Stefan Hoek ; OMICRON
Udo Ranninger ; OMICRON

Abstract

Detecting partial discharges in the insulation system of a power transformer at an early stage reduces the risk of total breakdown. One method to detect partial discharges is acoustic measurement. With this technique detection and localisation of partial discharge is possible by placing acoustic sensors on the surface of the transformer tank. The low impact of electrical interferences from outside the measurement set-up constitutes one of the strengths of the acoustic method. A further advantage is the ability to identify the position of the partial discharge source, which is needed to estimate the risk and to enable a fast and effective repair. The sensitivity and accuracy of the PD localisation can be improved with a combination with conventional electrical measurement or with Ultra High Frequency (UHF) measurement method. Since the UHF measurement method is more advantageous for measurement environments with heavy interferences in the field, the combination with acoustic localisation proves to be useful even in challenging field situations. This article describes the application of this procedure illustrating it with different practical examples.

Keywords

power transformer; partial discharge; acoustic localisation; electrical trigger; UHF ra

Hrčak ID:

182323

URI

https://hrcak.srce.hr/182323

Publication date:

8.10.2015.

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