Design and simulation of 33/11 kV transformer protection using MATLAB simulink

Transformer protection approaches priorities differential protection, with attempts to enhance based on comparing no fault and internal fault scenarios. When a failure occurs, it's important to remove the transformer from the operational zone as soon as possible to avoid damage to the coils. Differential protection identifies faults in the protection zone and disconnects it appropriately. Such relays are commonly employed in protecting electrical equipment because of their high sensitivity and reliability. The differential protection requires the transformer's input power match its output power. Under regular settings, there is no current flowing through the relay coil when the secondary current is suitable. When a problem evolves, the currents will not be balanced. To activate the circuit breakers and isolate the faulted transformer, trip signal will be sent by the relay. Therefore, this study is focused on the design of the differential relay protection for transformer protection 33/11 kV. Then the effect of designated relay analyzed whether it’s successfully detected whenever the fault occurs within transformers protected zone. The whole power system was modelled and simulated, including the transformer and circuit breaker with an external fault at various locations are randomly set on the system based on previous studies.