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Example1:

Example1:. A balanced three phase three-wire system has a line voltage of 500V. Two balanced Y-connected loads are present. One is a capacitive load with per phase, and the other is an inductive load with per phase. Find: The phase voltage. The line current.

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Example1:

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  1. Example1: • A balanced three phase three-wire system has a line voltage of 500V. Two balanced Y-connected loads are present. One is a capacitive load with per phase, and the other is an inductive load with per phase. Find: • The phase voltage. • The line current. • The total power drawn by the load. • The power factor at which the source is operating.

  2. Example2: • Three balanced Y-connected loads are installed on a balanced three-phase four-wire system. Load 1 draws a total power of 6 kW at unity power factor, load 2 requires 10 kVA at 0.96 lagging power factor and load 3 needs 7 kW at 0.85 lagging. If the phase voltage at loads is 135 V, and each line has a resistance of 0.1 , and if the neutral has a resistance of 1 , Find: • The total power drawn by the loads. • The combined PF of the loads. • The total power lost in the four lines. • The phase voltage at the source. • The power factor at which the source is operating.

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