Prok devices offers an earth fault relay. They are suitable for protection of electrical equipment from earth faults. This relay is a current sensing device, which is tropicalised and professionally designed and tested for protection of generators, transformers and feeders. Depending on the equipment, it can be operated with various earth fault protective schemes,. The magnitude of the earth fault current depends on the fault impedence. Invariably the fault impedence for earth fault is higher than that for phase faults. Therefore the earth fault current is low compared to the phase fault currents. The fault impedence depends on the system parameter and also on type of earthing. The neutral may be solidly grounded through resistance or reactance.
