Abstract
Differential protection relays are often used to protect power transformers. Differential protection is the primary safeguard for power transformers against internal defects. External faults have the same impact on the two sets of differential protection current transformers. When an external problem affects only one set of current transformers, differential protection fails and erroneous tripping occurs. This document explains how to safeguard any three-phase power transformer with standardised, current-based differential protection. The major goal of this research is to evaluate whether typical three-phase power transformers may benefit from differential protection.
Keywords: Fault condition, Power transformer, Differential protection, MATLAB Simulink Software
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