probenerИзвестия высших учебных заведений. ПРОБЛЕМЫ ЭНЕРГЕТИКИPower engineering: research, equipment, technology1998-99032658-5456Kazan State Power Engineering University10.30724/1998-9903-2025-27-3-38-52probener-3436Research ArticleЭЛЕКТРОТЕХНИЧЕСКИЕ КОМПЛЕКСЫ И СИСТЕМЫELECTROTECHNICAL COMPLEXES AND SYSTEMSПовышение точности оценки параметров надежности низковольтных коммутационных аппаратов, устанавливаемых в системах внутрицехового электроснабжения с учетом основных воздействующих факторовImproving the accuracy of estimation of reliability parameters of low-voltage switching devices installed in the systems of in house power supply taking into account the main influencing factorshttps://orcid.org/0009-0008-4497-4807ПетровА. Р.PetrovA. R.

Петров Алмаз Радикович – аспирант 

г. Казань

Almaz R. Petrov 

Kazan 

petroval13@mail.ruhttps://orcid.org/0000-0002-5379-847XГрачеваЕ. И.GrachevaE. I.

Грачева Елена Ивановна – д-р. техн. наук, профессор кафедры «Электроснабжение промышленных предприятий» 

г. Казань

Elena I. Gracheva 

Kazan 

grachieva.i@bk.ruАбдуллазяновЭ. Ю.AbdullazyanovE. Yu.

Абдуллазянов Эдвард Юнусович – канд.техн. наук., ректор 

г. Казань

Edvard Yu. Abdullazyanov  

Kazan 

Казанский государственный энергетический университетРоссияKazan State Power Engineering UniversityRussian Federation2025220720252733852Copyright © Петров А.Р., Грачева Е.И., Абдуллазянов Э.Ю., 20252025Петров А.Р., Грачева Е.И., Абдуллазянов Э.Ю.Petrov A.R., Gracheva E.I., Abdullazyanov E.Y.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.energyret.ru/jour/article/view/3436Актуальность

Актуальность. В статье исследуются вопросы оценки параметров надежности контактов низковольтных коммутационных аппаратов (НКА), устанавливаемых в низковольтных электрических сетях систем электроснабжения промышленных предприятий.

Цель

Цель. Исследование основных параметров надежности контактов НКА с использованием статистического метода и анализ физических процессов в контактных соединениях.

Методы

Методы. Для повышения точности определения интенсивности отказов НКА предлагается ввести поправочные коэффициенты, которые учитывают влияние основных воздействующих факторов на исследуемые НКА. Исследование коммутационного ресурса контактов было выполнено аналитическим и графико-аналитическим методом.

Результаты

Результаты. На основании проведенных исследований установлено, что для повышения достоверности оценки параметров НКА может быть рекомендован графико-аналитический метод с учетом поправочных коэффициентов. Значение числа циклов коммутаций аппарата, после которого появление отказа наиболее вероятно, зависит от его коэффициента загрузки. Выявлено, что для исследуемых аппаратов по истечении 25% ресурса числа коммутаций вероятность безотказной работы становится ниже допустимого значения.

Заключение

Заключение. Результаты исследований показывают, что после 3-5 лет эксплуатации вероятность безотказной работы наблюдаемых НКА снизилась до значения менее 0,85. Полученные результаты рекомендуется учитывать при составлении графиков планово-предупредительного ремонта в электрических сетях внутрицехового электроснабжения.

Relevance

Relevance. The article investigates the issues of evaluating the reliability parameters of contacts of low-voltage switching devices (LWSD) installed in low-voltage electrical networks of power supply systems of industrial enterprises.

Object

Object. To investigate the main parameters of reliability of LWSD contacts using the statistical method and to analyze the physical processes in the contact connections.

Methods

Methods. To improve the accuracy of determining the LWSD failure rate, it is proposed to introduce correction factors that take into account the influence of the main influencing factors on the studied LWSD. The study of the switching life of contacts was performed by analytical and graphical-analytical methods.

Results

Results. On the basis of the conducted researches it has been established that the graphical-analytical method with taking into account correction factors can be recommended to increase the reliability of LWSD parameters estimation. The value of the number of switching cycles of the device, after which the occurrence of failure is most likely, depends on its loading factor. It is revealed that for the studied devices after expiration of 25% of the resource number of switching cycles the probability of failure-free operation becomes lower than the permissible value.

Conclusions

Conclusions. The research results show that after 3-5 years of operation the probability of failure-free operation of the observed LWSD decreased to the value less than 0.85. The obtained results are recommended to be taken into account when drawing up schedules of preventive maintenance in the electrical networks of inhouse power supply.

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The authors declare that there are no conflicts of interest present.