A three phase engine has an usable power of 90 kW and anefficiency of 91%. The rating plate indicates the followingvalues:
- 90 kW
- Power factor: 0.89 (i)
- Voltage (volts): 230 delta - 400 wye
Taking as a reference of line voltages V1=V∠90º; direct sequenceand a phase oltage of the supply network of 230 V, find:
a) The phasors of the line and phase voltages of the supplynetwork
b) The true, reactive and apparent power
c) The phasors of the line and phase currents
When the engine is connected to a supply network of 400 V anddirect sequence, find:
d) The phasors of the line and phase voltages of the supplynetwork
e) The true, reactive and apparent powers
f) The phasors of the line and phase currents
