Which is more disastrous-shorting (phase to phase) & starting a generator or short circuit (phase to phase) happening on a generator running on load.
By mistake a LT DG was started with two phases shorted (at a short distance before the breaker) - resulting in damage of alternator rotor. However, high impedance differential protection etc did not operate to shutdown and save the m/c. Are the protections provided by controllers like DEIF, Easygen, Cummins PCC etc equivalent to the protection relays of Siemens/Alstom etc.
Any insights would be highly appreciated.
By mistake a LT DG was started with two phases shorted (at a short distance before the breaker) - resulting in damage of alternator rotor. However, high impedance differential protection etc did not operate to shutdown and save the m/c. Are the protections provided by controllers like DEIF, Easygen, Cummins PCC etc equivalent to the protection relays of Siemens/Alstom etc.
Any insights would be highly appreciated.