usually for no load testing of gen. set., please make sure that the operation hours is not more than 30 minutes because at no – load conditions (1) speed is almost ideal 1500 rpm (50Hz) and (2) more reactive power than active power produces by of alternator of gen. set (3) switched off all incoming and outgoing Air Circuit breaker (4) checked output voltage from gen. set. (5) if output voltage of gen. set is arounf 415V, at 50Hz (6) switched on incoming ACB (7) checked voltage and frequency and if stable (8) switch on outgoing ACB from Main switch board.
any specific matters, you can ask via e-mail: firasah@streamyx.com