IF I USED VVVF DRIVE IN FAN APPLICATION MOTOR IN 6.6 KV (
700 KW) MOTOR & DURING NORMAL RUN OPERATION TIME IF RPM
SUDDENLY REDUCE IN MOTOR BY DRIVE(E. MOTOR RPM REDUCE
SUDENLY 687 TO 550 RPM) WAHT WILL BE HAPPEND IN DRIVE
IN MY SYSTEM THERE IS ONLY OVER CURRENT EARTH FAULT RELAY
IS AVAILABLE. FOR THE UNBALANCE SENSING IS THERE ANY RELAY
IS AVAILABLE? THE SAME CTs WHICH ARE USED FOR THE OVER
CURRENT EARTH FAULT RELAY CAN USE FOR UNBALANCE ALSO?
why do you add the load short circuit impedance when
considering short circuit amperage. It seems that you should
only consider supply.
If you need to consider loads and you don't know what loads
are to be added , what would be a good sub-transient
reactance rating for the loads?
WE HAVE THE DC RECTIFIER 1500A, INPUT VOLTAGE IS 3 PHASE.
HOW TO CALICULATE THE LOAD? 3 PHASE SIDE EITHER dC SIDE.
PLEASE SUGGEST ME
how the phase convertor changes the no. of phases
when the time of backcharging the transformer three phases
only enough or three phase with neutral is must.from these
which one is the best one.