enter image description hereI have a question about how to select the right capacity of voltage stabilizer for a 3-phase supply system.

That system has the following type of load and capacity:

  1. Two 1 hp 3-phase motor, 440 VAC (M1 and M2), 1.7 A.
  2. 4 kW resistive heater (2 heaters on one phase (H1 & H2), other 2 heater are on (H3 & H4) other 2 phases).

As per my calculations, 7 kVA is sufficient with an 0.8 power factor. Could someone verify this? Please consider the inrush current of the motors too.

  • \$\begingroup\$ A diagram would be appropriate \$\endgroup\$
    – Voltage Spike
    Feb 16 at 18:48
  • \$\begingroup\$ @VoltageSpike added sir. Pls check. \$\endgroup\$ Feb 20 at 10:01
  • \$\begingroup\$ Diagram legend reads 415 V Motor, prose states 440 V - just saying. Line voltage for 230 V star voltage is 400 V, anyway. \$\endgroup\$
    – greybeard
    Feb 20 at 12:13
  • \$\begingroup\$ There's pretty little to base consideration of "inrush" current on - that's load dependant. As per my calculations, 7 kVA… Please put those in the question body, too. (Even without spin-up/inrush, there's a significantly higher value on the back of my envelope, assuming rated kVA relates directly to rated current per phase.) \$\endgroup\$
    – greybeard
    Feb 20 at 12:32
  • \$\begingroup\$ @greybeard how to calculate it with inrush? \$\endgroup\$ Feb 20 at 14:45


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