Academics – Electro-Technology : 2015/MAR/06
Question
Q1. An unbalanced star connected three phase load is supplied from a 440 V 50 Hz four wire supply.
The current in the red line is 6 A lagging by 30º, the current in the yellow line is 5A in phase and the current in the blue line is 7A lagging by 15º. Determine EACH of the following:
(a) The value of the current in the neutral line;
(b) Its phase relationship to the voltage between the red line and the neutral;
(c) The total power dissipated in the circuit.
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