Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers

Introduction. Ensuring the operational reliability of power transformers is an urgent task for the power industry in Ukraine and for most foreign countries. One of the ways to solve this problem is the correction of maximum permissible values of insulation parameters. However, such a correction is f...

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Autores principales:	O. Shutenko, S. Ponomarenko
Formato:	article
Lenguaje:	EN RU UK
Publicado:	National Technical University "Kharkiv Polytechnic Institute" 2021
Materias:	transformer oil oil indicators operating time statistical analysis distribution laws goodness-of-fit criteria weibull distribution density functions Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/6c891716ca2143f4bfdda61ed8f8ce59
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spelling	oai:doaj.org-article:6c891716ca2143f4bfdda61ed8f8ce592021-12-02T17:56:58ZAnalysis of distribution laws of transformer oil indicators in 110-330 kV transformers2074-272X2309-340410.20998/2074-272X.2021.5.07https://doaj.org/article/6c891716ca2143f4bfdda61ed8f8ce592021-10-01T00:00:00Zhttp://eie.khpi.edu.ua/article/view/239261https://doaj.org/toc/2074-272Xhttps://doaj.org/toc/2309-3404Introduction. Ensuring the operational reliability of power transformers is an urgent task for the power industry in Ukraine and for most foreign countries. One of the ways to solve this problem is the correction of maximum permissible values of insulation parameters. However, such a correction is fundamentally impossible without an analysis of the laws of distribution of diagnostic indicators in the equipment with different states. The purpose of the research is to analyse the laws of distribution of the quality indicators of transformer oil with different states in 110 and 330 kV transformers. Novelty. It was found that both 330 kV autotransformers and 110 kV transformers have the displacements between the mathematical expectations of the distribution density of usable oil indicators. It caused by different service life of the analysed transformers and different values of load factors. This indicates the need to consider the influence of these factors when correcting the maximum permissible values of oil indicators. Also, the presence of displacement between the distribution densities of some indicators of usable oil in 110 kV transformers and 330 kV autotransformers has been revealed. It indicates a different intensity of oxidation reactions in transformers with different voltage class. In order to reduce the heterogeneity of initial data the procedure of statistical processing of in-service test results has been proposed as a method. This procedure combines the use of a priori information about the service life of equipment and values of load factors with the elements of statistical hypothesis testing. The results of the analysis of the distribution laws of transformer oil indicators with different states have shown that for both usable and unusable oil the values of oil indicators obey the Weibull distribution. Values of the shape and scale parameters for each of the obtained indices arrays have been obtained, as well as calculated and critical values of the goodness-of-fit criteria. Practical value. Obtained values of the distribution law parameters of the transformer oil indicators with different states, considering the service life and operating conditions allow to perform the correction of the maximum permissible values of the indicators using the statistical decision-making methods.O. ShutenkoS. PonomarenkoNational Technical University "Kharkiv Polytechnic Institute"articletransformer oiloil indicatorsoperating timestatistical analysisdistribution lawsgoodness-of-fit criteriaweibull distributiondensity functionsElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENRUUKElectrical engineering & Electromechanics, Iss 5, Pp 46-56 (2021)
institution	DOAJ
collection	DOAJ
language	EN RU UK
topic	transformer oil oil indicators operating time statistical analysis distribution laws goodness-of-fit criteria weibull distribution density functions Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	transformer oil oil indicators operating time statistical analysis distribution laws goodness-of-fit criteria weibull distribution density functions Electrical engineering. Electronics. Nuclear engineering TK1-9971 O. Shutenko S. Ponomarenko Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers
description	Introduction. Ensuring the operational reliability of power transformers is an urgent task for the power industry in Ukraine and for most foreign countries. One of the ways to solve this problem is the correction of maximum permissible values of insulation parameters. However, such a correction is fundamentally impossible without an analysis of the laws of distribution of diagnostic indicators in the equipment with different states. The purpose of the research is to analyse the laws of distribution of the quality indicators of transformer oil with different states in 110 and 330 kV transformers. Novelty. It was found that both 330 kV autotransformers and 110 kV transformers have the displacements between the mathematical expectations of the distribution density of usable oil indicators. It caused by different service life of the analysed transformers and different values of load factors. This indicates the need to consider the influence of these factors when correcting the maximum permissible values of oil indicators. Also, the presence of displacement between the distribution densities of some indicators of usable oil in 110 kV transformers and 330 kV autotransformers has been revealed. It indicates a different intensity of oxidation reactions in transformers with different voltage class. In order to reduce the heterogeneity of initial data the procedure of statistical processing of in-service test results has been proposed as a method. This procedure combines the use of a priori information about the service life of equipment and values of load factors with the elements of statistical hypothesis testing. The results of the analysis of the distribution laws of transformer oil indicators with different states have shown that for both usable and unusable oil the values of oil indicators obey the Weibull distribution. Values of the shape and scale parameters for each of the obtained indices arrays have been obtained, as well as calculated and critical values of the goodness-of-fit criteria. Practical value. Obtained values of the distribution law parameters of the transformer oil indicators with different states, considering the service life and operating conditions allow to perform the correction of the maximum permissible values of the indicators using the statistical decision-making methods.
format	article
author	O. Shutenko S. Ponomarenko
author_facet	O. Shutenko S. Ponomarenko
author_sort	O. Shutenko
title	Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers
title_short	Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers
title_full	Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers
title_fullStr	Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers
title_full_unstemmed	Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers
title_sort	analysis of distribution laws of transformer oil indicators in 110-330 kv transformers
publisher	National Technical University "Kharkiv Polytechnic Institute"
publishDate	2021
url	https://doaj.org/article/6c891716ca2143f4bfdda61ed8f8ce59
work_keys_str_mv	AT oshutenko analysisofdistributionlawsoftransformeroilindicatorsin110330kvtransformers AT sponomarenko analysisofdistributionlawsoftransformeroilindicatorsin110330kvtransformers
_version_	1718379050688315392

Analysis of distribution laws of transformer oil indicators in 110-330 kV transformers

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