Determination of the optimum routine and self‐checking test time intervals for power system protection considering remote back‐up protection system failure. Issue 10 (1st October 2013)

• Record Type: Journal Article
• Authors: Damchi, Yaser; Sadeh, Javad
• Is Part Of: IET generation, transmission & distribution. Volume 7:Issue 10(2013)
• Page Start: 1163
• Page End: 1171
• Publication Date: 2013-10-01
• Subjects: maintenance engineering -- Markov processes -- power system measurement -- power system protection -- power system reliability -- probability; reliability -- monitoring facility -- probability -- extended Markov model -- maintenance cost -- OSTTI -- optimum self‐checking test time interval -- optimum routine test time interval -- ORTTI -- availability maximization -- remote back‐up protection system failure -- power system protection; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2012.0558
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : In this study, routine and self‐checking tests are performed as one of the methods to maximise the availability and adequate operation of power system protection. However, optimum routine test time intervals (ORTTI) and optimum self‐checking test time intervals (OSTTI) should be determined exactly to anticipate maintenance cost of power system protection precisely. Back‐up protection system failure has a vital role in determining precise ORTTI and OSTTI, whereas most of the previous studies have assumed that back‐up protection system is perfectly reliable. Therefore in this study, an extended Markov model is proposed to determine the ORTTI and OSTTI by considering remote back‐up protection system failure probability. It is worth noting that both self‐checking and monitoring facilities that improve reliability of the protection system are considered in the proposed Markov model. Simulation results demonstrate that variations in reliability indices, ORTTI and OSTTI for power system protection are significant when remote back‐up protection system is not fully reliable.