1. A wye-connected-load and a delta connected load are supplied by a four-wire 400 V three-phase, 50 Hz system. The connection for the wye loads are 2/20° ohms at line a, 30/50°V to line c and 6/75° ohms to line b. the connections for the delta load are 50/30° ohms between lines a and
1. A wye-connected-load and a delta connected load are supplied by a four-wire 400 V three-phase, 50 Hz system. The connection for the wye loads are 2/20° ohms at line a, 30/50°V to line c and 6/75° ohms to line b. the connections for the delta load
are 50/30° ohms between lines a and b, 25/-60° ohms between lines b and c, and 17.3/90° ohms between lines a and c. Find the current on line b.
2. A wattmeter reads 5,540 W when the current coil is connected in phase a and the voltage coil is connected between the neutral and phase a of a balanced 3-phase system supplying a balanced load of 30 A at 400 V. What will be the reading of the instrument if the connections to the current coil remain unchanged and the voltage coil is connected between phase b and c? Take a-b-c phase sequence.
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