Method for Detection of Developing Defects in High-Voltage Power Transformers by Results of the Analysis of Dissolved Oil Gases

Oleg Shutenko

Method for Detection of Developing Defects in High-Voltage Power Transformers by Results of the Analysis of Dissolved Oil Gases

Číslo: 1/2018
Periodikum: Acta Electrotechnica et Informatica
DOI: 10.15546/aeei-2018-0002

Klíčová slova: dissolved gas analysis, interpretation of transformer faults, dependency of concentrations of gases on time of operating, trend, correlation, the rule of taking a decision

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Anotace: The article describes a method for detecting developing defects in high-power oil-filled transformers, based on the results of analysis of dissolved gases in oil. It has been found that an early diagnostic sign of development of ionization processes of aging and thermal degradation in transformers’ isolation is the appearance of a systematic trend in the time dependencies of hydrocarbon gas content. Though, exceeding the concentrations of gases regulated by boundary values (the traditional criterion) does not always reflect the damage to the insulation, it often being reversible