Numerical Relay Based Transformer Protection
In power system the transformer is the most vital and expensive component. So we provide differential protection to the power transformer in order to prevent from abnormal condition. When internal fault occur this system works rapidly. However it should not operate under normal condition or non-fault condition such as a flowing inrush current. MATLAB/SIMULINK platform were used to study differential protection relay and under voltage relay for a power transformer. The basic approach is to give protection to the power transformer against internal faults and prevent interruption due to other operating conditions. In this paper, transformer terminal voltage and current signals are sensed by current transformer and potential transformer and utilized to enhance the reliability of differential protection.The proposed relay was able to distinguished between fault and no-fault conditions.
Keywords - Differential Protection, Power Transformer, Matlab, Fault Conditions.