A Comprehensive Assessment of Fundamental Overcurrent Relay Operation Optimization Function and Its Constraints

Michele Rojnić, Rene Prenc, Hrvoje Bulat and Dubravko Franković
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Michele Rojnić: Faculty of Engineering, University of Rijeka, Vukovarska 58, 51000 Rijeka, Croatia
Rene Prenc: Faculty of Engineering, University of Rijeka, Vukovarska 58, 51000 Rijeka, Croatia
Hrvoje Bulat: Croatian Transmission System Operator Ltd., Kupska 4, 10000 Zagreb, Croatia
Dubravko Franković: Faculty of Engineering, University of Rijeka, Vukovarska 58, 51000 Rijeka, Croatia

Energies, 2022, vol. 15, issue 4, 1-20

Abstract: The optimization of overcurrent relays’ operation is a topic associated with protection coordination of distribution networks. Usually, this refers to medium-voltage networks, since they are protected by numerical relay devices, as opposed to low-voltage networks, where utility operators allocate fuses. Correct setting of relays and optimal coordination is becoming a serious challenge to Distribution Network Operators around the world, since their networks’ passive operation has been greatly altered in the past two decades. Distributed generation units, a growing liberalized electricity market and more stringent legislation for distribution network planning and operation by state regulatory bodies have all indirectly affected the evolving of protection philosophy for distribution networks. In this paper the traditional optimization problem of overcurrent relay operation will be addressed and critically examined from both a theoretical and practical point of view. Optimization function, constraints and relay parameters will all be observed and compared with solutions used in distribution networks, and their modifications and improvements will be proposed and elaborated in detail.

Keywords: overcurrent relays; protection optimization; plug settings; time multiplier settings; coordination time interval (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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