What Is Directional Earth Fault. If there is a fault the breaker between the power sources is OPENED. Earth fault ef directional protection It is sensitive to the direction of flow of the current to earth.
The earth-fault current and the zero-sequence voltage unit continuously measure the zero-sequence voltage earth-fault current and phase angle of the object. Also describes how directional elements are applied during loss of voltage conditions. Earth faults are characterized by the presence of Zero Sequence Curren I0.
The directional relay senses the fault in only one direction and doesnt operate when the fault is in the opposite direction.
The directional relay senses the fault in only one direction and doesnt operate when the fault is in the opposite direction. Relay R1 is used for providing protection against earth fault at the secondary side of 25MVA 1133kV transformer whereas relay R2 has to provide protection at bus B. INTRODUCTION Directional elements determine the fault direction. Directional Earth Fault Like Directional Overcurrent Directional Earth Fault DEF is used to differentiate between different fault types to ensure that co-ordination between protection devices such as distribution circuit breakers and reclosers is maintained.
