An unbalanced 4 wire star connected load consisting of the phaseimpedances ZRS (15+j5)2, Zrs (10+jo)N and ZBs (18-j6)N is connected to a3-phase, 440V, 50HZ supply. Draw the circuit diagram including theimplementation of a 2 wattmeter power measurement and from this:(b)(i)(ii)Calculate the 3 line currents (IR, Iy and IgB).Construct a scaled phasor diagram and using this or otherwisedetermine the star/neutral current IsN. Include VRY and VRB ONthe phasor diagram.Calculate the necessary wire diameter for the star/neutralconnection to achieve a current density of 3A/mm2.(iii)(c)Determine the total real supply power (W) for QI(b) based on the 2wattmeter measurements.

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Answered: An unbalanced 4 wire star connected…

An unbalanced 4 wire star connected load consisting of the phase impedances ZRS (15+j5)2, Zys (10+j0)2 and ZBs (18-j6)2 is connected to a

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Single Phase Induction Motor

The single-phase induction motor or engine consists of a single rotating phase in the stator and a rotating cage in the rotor. When phase one supply is connected to the stator winding, a magnetic field is generated. In the pulsating field, the rotor does not rotate due to inertia. So, a single-phase import motor does not start and requires some initial methods.

Question

An unbalanced 4 wire star connected load consisting of the phase
impedances ZRS (15+j5)2, Zrs (10+jo)N and ZBs (18-j6)N is connected to a
3-phase, 440V, 50HZ supply. Draw the circuit diagram including the
implementation of a 2 wattmeter power measurement and from this:
(b)
(i)
(ii)
Calculate the 3 line currents (IR, Iy and IgB).
Construct a scaled phasor diagram and using this or otherwise
determine the star/neutral current IsN. Include VRY and VRB ON
the phasor diagram.
Calculate the necessary wire diameter for the star/neutral
connection to achieve a current density of 3A/mm2.
(iii)
(c)
Determine the total real supply power (W) for QI(b) based on the 2
wattmeter measurements.

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