The reliability of the gas-filled 110 – 750 kV circuit breaker units of substations

Dementyev, Yu. A.; Мисриханов, М. Ш.; Stolyarov, E. I.; Abdurakhmanov, Abdula; Fedorov, V. E.; Shuntov, Andrey

doi:10.1007/s10749-011-0240-6

Cited by 4 publications

(3 citation statements)

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“…Функції локалізації аварій на електричних станціях та підстанціях виконують насамперед високовольтні вимикачі, від надійності функціонування яких значною мірою залежить стійкість забезпечення електропостачання споживачів. Частка високовольтних вимикачів у загальній пошкоджуваності електрообладнання на сьогоднішній день складає від 30 до 40 % [5,7].…”

Section: нечітке моделювання комутаційного обладнання для задач оцінк...unclassified

Fuzzy Modeling of Switching Equipment for Tasks of Assessing the Risk of Emergency Situations in the Eps in Case of Electrical Equipment Failures

Бардик¹,

Бондаренко²

2023

ENERHETYKA: ekonomika, tekhnolohiyi, ekolohiya

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Today in the electric power industry of Ukraine the issue of assessing the risk of EPS operation due to failures of electrical equipment is particularly important. Failures are associated with significant level of aging and low replacement rates of electrical equipment, also with the possible simultaneous emergency decommissioning of several elements as a result of terrorist attacks. Based on the analysis of the operating conditions of high-voltage switching equipment, standards and operational documentation method of diagnosing the technical condition of SF6 circuit breakers is proposed. This method is based on the use of fuzzy set theory. To assess the risk of power outages in the EPS in case of electrical equipment failures, a linguistic model is proposed for determining the total residual life and the probability of failure of SF6 high-voltage circuit breakers of various types. Which is based on the aggregation of information on the technical condition of individual functional units. An approach is proposed to take into account the importance of individual units of the circuit breaker in terms of the impact on the total residual life by weight coefficients determined due to failure statistics. The result of determining the total residual life is the ability to estimate the probability of failure on the observation time interval. Tuning and adaptation of the developed linguistic model of the SF6 circuit breaker to real operating conditions is provided by adjusting the parameters of the membership functions of the terms of the input linguistic variables using weighting coefficients and fuzzy inference with weighted average truth. The developed linguistic mathematical model for assessing the technical condition and probability of failure of SF6 circuit breakers can be used as a component of the complex of risk analysis programs in the EPS. And the formation of preventive actions to ensure the operational reliability of electrical equipment and regime reliability of the EPS in case of emergency equipment failures.

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Section: нечітке моделювання комутаційного обладнання для задач оцінк...unclassified

Fuzzy Modeling of Switching Equipment for Tasks of Assessing the Risk of Emergency Situations in the Eps in Case of Electrical Equipment Failures

Бардик¹,

Бондаренко²

2023

ENERHETYKA: ekonomika, tekhnolohiyi, ekolohiya

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“…It gives only some hints on how to analyse failure data. Dementyev et al compiled statistics about planned and unplanned outages affecting circuit breakers of different voltages with 3860 circuit-breaker years [30]. Andruşcǎ present statistics about different failure types and which parameters should be monitored [31].…”

Section: A Failure Statistics About Circuit Breakersmentioning

confidence: 99%

A review of methods for condition monitoring, surveys and statistical analyses of disconnectors and circuit breakers

Westerlund

Hilber

Lindquist

et al. 2014

2014 International Conference on Probabilistic Methods Applied to Power Systems (PMAPS)

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Abstract-There is a need for a new survey of conditionmonitoring methods for circuit breakers and disconnectors, since during the last two decades less than ten surveys have been carried out. The paper presents several statistical surveys and analyses. The methods of condition monitoring found are reviewed and classified according to the different types of failure identified in the surveys. Some research gaps are identified, such as the prediction of the degradation of the contacts, the signal processing of coil and motor currents and the switching.

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“…The improvement of the reliability of high-voltage circuit breakers and the in-depth analysis of failure mechanisms have been difficult issues for domestic and foreign power companies and users, switchgear-manufacturing companies, universities, and other research institutions [4,5]. The results of the three reliability surveys conducted by the SC A3 Working Group of the International Council on Large Electric Systems (CIGRE) on switchgear operating in the global grid show that circuit breaker failures caused by mechanical failures, such as the malfunction and refusal to operate of the operating mechanism, account for more than 70% of the total failure rate [6]. Table 1 shows the results of the State Grid Corporation's research on the failure modes of high-voltage circuit breakers in grid operation in China.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Estimation of Critical Components in a Motor-Energized Spring Operating Mechanism Based on Theory of Reliability

Ma,

Qian,

Zhang

et al. 2024

Energies

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High-voltage switchgear is a key control and protection unit in power systems. The reliable operation of the operating mechanism is essential for the reliable opening and closing of the switchgear. This is a vital guarantee for the safety and stability of the power systems. The spring operating mechanism is a commonly used actuator for circuit breakers at 12–252 kV. However, a reliability estimation method that is convenient, practical and accurate is still lacking. The aim of this paper is to explore a reliability estimation method based on a stress–strength interference reliability theory and a fatigue life theory. The changing rules of the reliability of the main axis, and the closing pawl and opening pawl in the spring operating mechanism during operations, are achieved. The accuracy of the calculated reliability based on theories of stress–strength interference and fatigue life is verified by adopting a test data statistical reliability model based on Weibull distribution. The results show that the reliability estimation method based on stress–strength interference and fatigue life theories has a high degree of confidence. The maximum tolerance is 0.024. The study would help in providing a useful reference for the optimization and durability estimation of a spring operating mechanism and its key components in high-voltage circuit breakers.

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The reliability of the gas-filled 110 – 750 kV circuit breaker units of substations

Cited by 4 publications

References 0 publications

Fuzzy Modeling of Switching Equipment for Tasks of Assessing the Risk of Emergency Situations in the Eps in Case of Electrical Equipment Failures

Fuzzy Modeling of Switching Equipment for Tasks of Assessing the Risk of Emergency Situations in the Eps in Case of Electrical Equipment Failures

A review of methods for condition monitoring, surveys and statistical analyses of disconnectors and circuit breakers

Fatigue Life Estimation of Critical Components in a Motor-Energized Spring Operating Mechanism Based on Theory of Reliability

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