Development a Numerical Algorithm for Differential Relay for Transformer Protection

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Gholami, Mohammad | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47619 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Vakilian, Mehdi
Abstract:
The goal of this master thesis is to develop a new accurate numerical algorithm for digital differential relay to protect a power transformer. This work employs specially developed software to simplify its input signal processing task which helps to quickly and accurately detect and clear the transformer internal faults. The available commercial transformer digital differential relays lack the required sensitivity to detect turn to turn faults when a few numbers of turns (less than 10% of the winding) are involved. This work presents a new equivalent circuit for transformer when a turn to turn fault occurs on either winding. This equivalent circuit helped to develop an accurate algorithm for turn to turn fault detection. The performance of this new differential relay algorithm is verified through some simulations using the MATLAB software
Keywords:
Transformers ; Protection Relays ; Transformer Protection ; Differential Protection ; Turn to Turn Fault Detection

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