A multi-criteria differential transformer relay based on fuzzy logic

Abstract

Abstract-This paper presents a digital relay scheme for the primary protection of power transformers. A multi-criteria algorithm is developed based on fuzzy sets for the decision making part of the scheme. The cost of wrong decision-making and the amount of information inflow are used along with several standard criteria to improve the reliability of the protection. It is shown that the proposed scheme, if properly tuned, can enhance the sensitivity and selectivity of the digital relay and mitigate problems associated with conventional relay schemes.

Protection of power transformer using multi criteria decision-making

“…These 0 and 1 outputs correspond to decisions of the relay, ''To Trip'' and ''To Block'', respectively. The fuzzy logic approach has been used in this paper to model the DIFP and REF relays [11].…”

Fuzzy logic application to out-of-step protection of generators

“…The use of fuzzy algebra rules in the process of aggregation of different in nature and reliability protection criteria enables easy realization of multi-criteria decisionmaking. Sample applications of this approach to power system protection include fault type identification [6], multi-criteria protection of power transformers [7], etc.…”

Application of Discrete Wavelet Transform for Differential Protection of Power Transformers

“…In order to overcome such limitation, a significant number of relaying formulations have been proposed (Abed & Mohammed, 2007;Eissa, 2005;Faiz & Lotfi-Fard, 2006;Mao & Aggarwal, 2000;Megahed et al, 2008;Morate & Nicoletti, 1999;Ngaopitakkul & Kunakorn, 2006;Saleh & Rahman, 2005. Thomas & Ozgönenel, 2007Wang & Butler, 2001;Wiszniewski & Kasztenny, 1995;Zaman et al, 1996). These formulations are based on finite elements, artificial neural networks, fuzzy systems, dynamical principal components analysis, wavelet transforms (WTs) and hybrid systems.…”