Transformer of distribution:
Let be the transformer of distribution of the Face(Figure) 3 connected to the primary between phase a and c of a three-phase network of 23 kV. Both rolling-ups of low voltage are 120 V with the indicated polarities.
Loadsconnected to the secondary are:
L1: Heating, 1.5 kW with a power factor of 1
L2:Drill, 0.5 kW with a power factor of 0.81 lagging.
L3:Pump, 2.53 kW with a power factor of 0.92 lagging
The model of the transformer is of ideal type.
1-Calculate the current phasor of the loadL1.
2-Calculate the current phasor of the loadL2.
3-Calculate the current phasor of the loadL3.
4-Calculate the currentphasor in the primaryof the transformer (entering the positive polarity).
5-Calculate the total apparent power seen in the primary of the transformer.
Figure: The transformer of distribution