Open AccessEvaluation of the impacts of relay coordination on power system reliability
Author(s) -
Jazaeri Mostafa,
Farzinfar Mehdi,
Razavi Farzad
Publication year - 2015
Publication title -
international transactions on electrical energy systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 42
ISSN - 2050-7038
DOI - 10.1002/etep.2042
Subject(s) - reliability engineering , reliability (semiconductor) , relay , electric power system , circuit breaker , fault (geology) , computer science , markov chain monte carlo , monte carlo method , protective relay , markov chain , power (physics) , engineering , electrical engineering , bayesian probability , statistics , physics , mathematics , quantum mechanics , artificial intelligence , machine learning , seismology , geology
Summary The security and reliability of a power system rely on establishing and maintaining proper coordination among protective relays. In addition to interrupting unnecessary loads, the probability of exposing hidden failures in protection system components such as Circuit Breakers (CBs) may increase as a consequence of miscoordination among relays. In order to evaluate how malfunction of a protection system can degrade the reliability of the system, this paper proposes a new Markov Chain Monte Carlo (MCMC) algorithm. Furthermore, to consider the impact of relay miscoordination on the hidden failure of protection systems, the paper proposes a failure index which is contingent on the magnitude and duration of fault currents. Then, for a sample test system, the reliability indices of SAIDI, EENS, and ECOST are obtained for three scenarios with different relay settings and coordination. The results are then compared to show that how protection miscoordination in medium‐voltage networks degrades the reliability level of the system. Copyright © 2014 John Wiley & Sons, Ltd.