Author/Authors :
shahira, . universiti malaysia perlis - centre of excellence for renewable energy (cere), school of electrical system engineering, Arau, Malaysia , hanum, hamizah universiti malaysia perlis - centre of excellence for renewable energy (cere), school of electrical system engineering, Arau, Malaysia , hanan, farah universiti malaysia perlis - centre of excellence for renewable energy (cere), school of electrical system engineering, Arau, Malaysia , poobalan, b. universiti malaysia perlis - centre of excellence for renewable energy (cere), school of electrical system engineering, Arau, Malaysia
Abstract :
During short circuit fault, electrical equipment and power network suffers high stress of fault current which may permanently damage the equipment and the networks. An overcurrent occurs when current exceeds the rating of equipment. For this project, the current relay protection is located between the transmission line and transformer. The current relay is implemented to protect the 220kV power system. The system is designed and simulated using MATLAB software. The output waveforms of before and after the occurrence of a fault were analyzed. The output current waveform for the power system in a normal condition is sinusoidal with the same peak current. When a fault is injected into the system between the transmission line and transformer, the output current waveform increases drastically. The relay will energize and send a trip signal to the circuit breaker. The circuit breaker will disconnect the power system from the transformer, interrupting the current flow in the power system. Hence, no current flows in the system after a fault occurs.
Keywords :
Overcurrent , Relay , Transformer , Fault
