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Circuit breaker failure data and reliability modelling
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0003-4763-9429
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2008 (English)In: IET Generation, Transmission and Distribution, ISSN 1751-8687, Vol. 2, no 6, 813-820 p.Article in journal (Refereed) Published
Abstract [en]

The results from an extensive study of SF6 and minimum-oil circuit breaker failures in the Swedish and Finnish transmission systems are presented. The study includes 1546 breakers with a total operating history of 16 384 years. In the study, a detailed analysis of a specific SF6 type of breaker revealed which parts caused the failures and an estimation of their hazard rates was made. A model of complete reliability for this type of breaker is presented, illustrated by presenting the operating and maintenance history of a shunt reactor breaker in the Swedish transmission system.

Place, publisher, year, edition, pages
2008. Vol. 2, no 6, 813-820 p.
Keyword [en]
Capacitance; Circuit breaking arcs; Electric circuit breakers; Electric power transmission; Electric reactors; Power transmission; Reliability; Circuit breaker failures; Finnish; Hazard rates; Modelling; Shunt reactors; Transmission systems
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-8180DOI: 10.1049/iet-gtd:20080127ISI: 000261469400004Scopus ID: 2-s2.0-54949114772OAI: oai:DiVA.org:kth-8180DiVA: diva2:13433
Note
QC 20100823. Uppdaterad från submitted till published (20100823).Available from: 2008-04-03 Created: 2008-04-03 Last updated: 2010-08-23Bibliographically approved
In thesis
1. On reliability and maintenance modelling of ageing equipment in electric power systems
Open this publication in new window or tab >>On reliability and maintenance modelling of ageing equipment in electric power systems
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Maintenance optimisation is essential to achieve cost-efficiency, availability and reliability of supply in electric power systems. The process of maintenance optimisation requires information about the costs of preventive and corrective maintenance, as well as the costs of failures borne by both electricity suppliers and customers. To calculate expected costs, information is needed about equipment reliability characteristics and the way in which maintenance affects equipment reliability. The aim of this Ph.D. work has been to develop equipment reliability models taking the effect of maintenance into account.

The research has focussed on the interrelated areas of condition estimation, reliability modelling and maintenance modelling, which have been investigated in a number of case studies. In the area of condition estimation two methods to quantitatively estimate the condition of disconnector contacts have been developed, which utilise results from infrared thermography inspections and contact resistance measurements. The accuracy of these methods were investigated in two case studies. Reliability models have been developed and implemented for SF6 circuit-breakers, disconnector contacts and XLPE cables in three separate case studies. These models were formulated using both empirical and physical modelling approaches. To improve confidence in such models a Bayesian statistical method incorporating information from the equipment design process was also developed. This method was illustrated in a case study of SF6 circuit-breaker operating rods. Methods for quantifying the effect of maintenance on equipment condition and reliability have been investigated in case studies on disconnector contacts and SF6 circuit-breakers. The input required by these methods are condition measurements and historical failure and maintenance data, respectively.

This research has demonstrated that the effect of maintenance on power system equipment may be quantified using available data. However, realising the full potential of these methods requires the gathering and utilisation of failure and maintenance data as well as condition measurements to be improved.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. ix, 55 p.
Series
Trita-EE, ISSN 1653-5146 ; 2008:016
Keyword
Reliability, maintenance, electric power systems, circuit breaker, disconnector, thermography
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-4688 (URN)978-91-628-7465-0 (ISBN)
Public defence
2008-04-25, F3, Lindstedtvägen 26, Stockholm, 13:15
Opponent
Supervisors
Note
QC 20100823Available from: 2008-04-03 Created: 2008-04-03 Last updated: 2010-08-23Bibliographically approved

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Bertling, Lina

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