Enhancement of the Technique for Calculation and Assessment of the Condition of Major Insulation of Power Transformers

Olga Melnikova, Alexandr Nazarychev and Konstantin Suslov
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Olga Melnikova: Department of High-Voltage Electric Power Engineering, Electrical Engineering and Electrophysics, Ivanovo State Power Engineering University, 153003 Ivanovo, Russia
Alexandr Nazarychev: Department of Electric Power Engineering and Electromechanics, Saint Petersburg Mining University, 199106 St. Petersburg, Russia
Konstantin Suslov: Department of Power Supply and Electrical Engineering, Irkutsk National Research Technical University, 664074 Irkutsk, Russia

Energies, 2022, vol. 15, issue 4, 1-13

Abstract: The findings of the analysis of data on the accident rate of power transformers indicate that one of the main causes of their failures is a decrease in the dielectric strength of the insulation. To reduce failures and extend the service life of power transformers in operation, the issue of enhancing the techniques for assessing the condition of their internal insulation becomes relevant. Currently, when selecting the major insulation of transformers, one takes into account the dependency of the dielectric strength of the oil passage on its width. Experts discuss the issues involved in the choice of major insulation while taking into account the effect of the generalized factor being the volume of the oil passage. The solution to that problem largely depends on the study of the statistical characteristics of the dielectric strength of oil passages of different volumes and the effect rated parameters of transformers have on them. The efficiency of the application of such diagnostic characteristics depends on the extent of studies available on them and the establishment of their standardized parameters. The paper proposes a method for estimating the change in the transformer oil volume in stressed oil passages of major insulation of high-voltage power transformers and statistical characteristics of the dielectric strength of these passages while taking into account the effect of the rated values of capacity and voltage of transformers. It is shown that the degree of effect of transformer technical parameters on the statistical characteristics of the dielectric strength of oil passages depends on the quality of transformer oil, which undergoes a change in operating conditions.

Keywords: power transformers; insulation of transformers; diagnostic characteristics; transformer oil volume; statistical characteristics; oil passages; dielectric strength; estimating change method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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