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Journal of Energy : Energija, Vol. 63 No. 1-4, 2014.

Original scientific paper

STATISTICAL AND NUMERICAL ANALYSIS OF TRANSFORMER OIL AC BREAKDOWN

Mladen Marković orcid id orcid.org/0000-0002-8102-5386 ; Končar Distribution & Special Transformers
Ivanka Radić ; Končar Distribution & Special Transformers
Vlatka Matun ; Končar Distribution & Special Transformers

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Abstract

Transformer oil AC breakdown research is an important part of transformer insulation design.
Research presented in this paper consists of statistical and numerical analysis of breakdown data
measured in portable oil tester. Statistical analysis is done by modeling measured data as a random process
with Gaussian and Weibull probability function. Numerical analysis uses statistical data for calculation of
stressed oil volume, stressed electrode area and safety factors of “cumulative stress” method. Both
statistical and numerical analysis showed how breakdown withstand depends on different variables and
why they are important in measurement interpretation.

Keywords

oil breakdown; Gaussian distribution; Weibull distribution; FEM; stressed oil volume; stressed electrode area; “cumulative stress” method

Hrčak ID:

199250

URI

https://hrcak.srce.hr/199250

Publication date:

15.8.2017.

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