Abstract :
Curves have been developed which show the currents in the shorted turns, the voltages across a faulted coil, and the heat losses developed, all as a function of the fault resistance. These show that with decreasing fault resistance, all faults will damage the conductor by melting the copper at the point of fault. Existing relays cannot prevent the damage. Impedance measurements, which can detect turn faults at an incipient stage, have been suggested.
