Protection of power transformer using multi criteria decision-making |
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| Affiliation: | 1. School of ECE, College of Engineering, University of Tehran, Tehran 14395-515, Iran;2. Control and Intelligent Processing Center of Excellence, School of ECE, College of Engineering, University of Tehran, Tehran 14395-515, Iran;1. Università di Trieste, Department of Engineering and Architecture, via Valerio 10, 34127 Trieste, Italy;2. Ricerca sul Sistema Energetico—RSE SpA, via Rubattino 54, 20134 Milano, Italy;1. School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China;2. Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, UK;1. Electrical Department, Adani Institute of Infrastructure Engineering (GTU), Ahmedabad, Gujarat 382421, India;2. Electrical Department, Government Engineering College, Bharuch, Gujarat 392002, India;3. Electrical Department, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat 395007, India;1. Wroclaw University of Technology, Wroclaw, Poland;2. Siemens AG, PTD EA, Berlin, Germany |
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| Abstract: | Power transformers are protected by different relays that operate independently. Malfunction of each relay has a major role in reducing the reliability of the protection system. In order to mitigate the main drawbacks of the power transformer relays, an overall protection scheme is presented in this paper. This scheme proposes a novel multi criterion algorithm using decision-making based on fuzzy logic. In this paper the outputs of restricted earth fault relay and a directional check unit, are combined with the output of the differential protection relay. Therefore, problems that are pertaining to independent operation of each relay have been mitigated and the relays cover protection blind spots of each other. The improved power transformer protection (IPTP) scheme enhances the sensitivity and reliability of the power transformer protection. Extensive simulations are used to measure the effectiveness and merit of the proposed IPTP relay. The above efforts result in a multi criteria approach for protection of power transformers. |
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| Keywords: | CT saturation Differential relay Fuzzy logic Inrush current Multi criteria decision-making Restricted earth fault relay |
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