Question

Q4. A Three phase star connected abc supply system has 440V (rms) line voltage with 50 Hz frequency. A star connected load combination of (Apparent power) $S_a = S_b = S_c = 500VA$ 0.8pf lagging, is connected to this supply. Assume that the neutral points of both supply system and load are connected to each other. Then, (a) Find the per phase impedance of the load and using them, draw the circuit diagram of this system representing all the phase voltage sources and phase impedances. [12 M]. (b) Find the phase wise currents of the load. [6 M]. (c) Find the current flowing through the neutral wire. [2 M]. (d) Draw the phasor diagram of this system indicating phase voltages, line voltages and all the currents. [10 M]. For reference, take phase to neutral voltage of 'a' phase and mention all the phasors clearly with relevant angles in degrees with respect to the reference. Please indicate all the values in polar form for uniformity.

          Q4. A Three phase star connected abc supply system has 440V (rms) line voltage with 50 Hz frequency. A star
connected load combination of (Apparent power) $S_a = S_b = S_c = 500VA$ 0.8pf lagging, is connected to this
supply. Assume that the neutral points of both supply system and load are connected to each other. Then,
(a) Find the per phase impedance of the load and using them, draw the circuit diagram of this system
representing all the phase voltage sources and phase impedances. [12 M].
(b) Find the phase wise currents of the load. [6 M].
(c) Find the current flowing through the neutral wire. [2 M].
(d) Draw the phasor diagram of this system indicating phase voltages, line voltages and all the currents. [10
M].
For reference, take phase to neutral voltage of 'a' phase and mention all the phasors clearly with relevant
angles in degrees with respect to the reference.
Please indicate all the values in polar form for uniformity.

Q4. A Three phase star connected abc supply system has 440V (rms) line voltage with 50 Hz frequency. A star
connected load combination of (Apparent power) Sa = Sb = Sc = 500VA 0.8pf lagging, is connected to this
supply. Assume that the neutral points of both supply system and load are connected to each other. Then,
(a) Find the per phase impedance of the load and using them, draw the circuit diagram of this system
representing all the phase voltage sources and phase impedances. [12 M].
(b) Find the phase wise currents of the load. [6 M].
(c) Find the current flowing through the neutral wire. [2 M].
(d) Draw the phasor diagram of this system indicating phase voltages, line voltages and all the currents. [10
M].
For reference, take phase to neutral voltage of 'a' phase and mention all the phasors clearly with relevant
angles in degrees with respect to the reference.
Please indicate all the values in polar form for uniformity.

Added by Adam R.

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