Original scientific paper

Diagnostics of HV bushings through oil sampling and analysis: Experience with GSU transformers

Riccardo Actis
Riccardo Maina
Vander Tumiatti

Abstract

Bushings are highly stressed parts of power transformers and their failures can lead to a transformer break-down. The diagnostics and predictive surveillance of bushings is essential for uninterrupted operation of transformers. Diagnostic tools applied include electrical tests, thermography and, to a minor extent, oil anal-ysis for oil-impregnated bushings. This paper gives a short review of bushing types and related applications, including procedures for in-field inspection and oil sampling. Dissolved Gas Analysis (DGA) issues in bush-ings’ mineral oil are briefly discussed and diagnostic criteria for DGA interpretation are given, comparing the experience of the authors with the available literature and standards.

Keywords

mineral oil; SF6; bushings; transformer; DGA; diagnosis

Hrčak ID:

202529

URI

https://hrcak.srce.hr/202529

Publication date:

23.11.2017.

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