In the initial stage of frequency conversion to start the fuel-oil pump

the output capacity of said pump has been lowered

being difficult to maitain the pressure in fuel oil system.For this

the pressure variation of fuel oil in the process of switching the pump over has been compared and analysed through comparison test of interlock and switch over under frequency conversion and power frequency of the fuel oil pump.Results show that the switch over mode adopted by the fuel oil pump under frequency conversion can lead the fuel oil system to trip

but the switch over mode under power frequency can avoid the fuel oil system to trip.