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A Proposed Algorithm for Current Differential Protection of Delta Hexagonal Phase Shifting Transformer

This paper presents a proposed algorithm for the differential protection of delta-hexagonal-type phase shifting transformer (PST). The algorithm is advantageous due to its simplicity, where only source and load currents are detected and used to obtain the excitation currents. This is based on the complete analysis of the current relationships between electrically connected and magnetically coupled circuits of the delta hexagonal PST. The excitation currents are used to provide the differential currents for the protection relay. Different types of faults are detected with high degree of sensitivity considering the effect of magnetization inrush current. The presented algorithm reduces the number of transducers from 18 to only 6, which eliminates the need for voltage transformers (VTs). System is modeled via Matlab/Simulink® software package. The results ensure the capability of the new algorithm to provide fast fault clearing for internal faults and stability for external faults.