Design of Digital Differential Relay for Protection of Power Transformers Operating Under Highly Non-Linear Load

Year 2023, Volume: 1 Issue: 2, 94 - 104, 31.12.2023

Hülya Doğan

An Erratum to this article was published on June 30, 2024. https://dergipark.org.tr/en/pub/cumfad/issue/83249/1440005

Abstract

Electric Arc Furnaces (EAF) are the loads in the industry with highest rate of power consumption and they have a highly non-linear operating characteristic. In this study, Design of digital differential role model for protection of three-phase step-down power transformer supplying EAF and Matlab/Simulink simulation are presented. For this purpose, three-phase system model supplying power to EAF is modelled by means of Matlab/Simulink. In order to ensure sensitivity to role and distinguish the inrush currents from fault currents, inrush currents and current harmonics experimentally obtained from 100 MVA power transformer are measured. Thus, the difference between inrush and fault currents are specified and appropriate relay slope coefficients for designed dual-slope role characteristic are defined. When single-phase and multiphase faults in the obtained results of the simulation are examined in this study, it is revealed that the designed digital differential relay has an efficient operational performance in loads with highly non-linear and rapid changes characteristic such as EAF.

Keywords

Digital Differential Relay, Electric Arc Furnace (EAF), Non-Linear Load, Transformer Protection

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