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Restricted Earth Fault Protection Calculation. High impedance and low impedance. A ground relay must detect all phase-to-ground faults within its defined zone of protection under conditions which produce minimum fault current.
Restricted Earth Fault Protection System Explanation Working Circuit Globe from circuitglobe.com
This scheme is called Restricted Earth Fault REF scheme. Consequently a separate scheme is required to detect internal earth faults. At the time of Maximum fault conditions.
It is Voltage Limiting Non-Linear Resistor.
By mistake I have said. Working with Earth Fault Protection System. It is Voltage Limiting Non-Linear Resistor. REF protection is fast and can isolate winding faults extremely quickly thereby limiting damage and consequent repair costs.
