Election of soft starting element of motor

Motor power P=220KW
Motor input voltage U=380V
Three-phase power supply power calculation formula P=1.732*U*I*cosa
The values of U and I are valid

Usually when the motor starts, cosa=0.8 average current per phase IT(AV)=0.9*I
Average advection IT1(AV) for each component =0.45*I

The starting current is limited to 4 times the rated value
Device voltage selection principle VDRM/VRRM=(2-3)*1.414*U


Post time: Jun-08-2023