Abstract
The transformer is vital components in power system network. Because of its simple construction, it is a more reliable equipment. To simulate the model of differential relay many problems, such as Tap changing, inherent phase-shift of currents in transformer, CT ratio, Non identical CT. According to the traditional protection the power transformer is balanced by interposing the CTs on star side, the Simulink model has been simulated in MATLAB. Keeping design principle in mind the parameter of transformers was obtained by Open circuit and Short Circuit test in the laboratory environment. Differential relay was modeled using Simulink. The calculated parameter were than simulated in MATLAB/Simulink the differential relay is simulated as per the panel available in laboratory.
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