q1 Bg6= 9 g7 = 8 Q1 (a) A 3 phase industrial load can be represented by a balanced star connected load(ZRN etc) of (2G7 + j6) Q and is connected to a 3 phase, 1G600 V and 50 Hzsupply.Calculate:(i)The three line currents (IR, Iy and IB).(ii)The real power (W) in each phase of the load – using 2 differentmethods to calculate this.(iii)The apparent power (VA), reactive power (VAr) and powerfactor for each of the supply phases.(iv)The total real power (W) from the supply if the load is deltaconnected.(b)An industrial load operating from a 3 phase, 1G6 kV and 50 Hz supply has adelta connected load with nominally balanced load impedances (ZRY etc) of(2G70 + j80) .Using the information above determine the following for a faulted red-yellowload (ZrY) which results in the red-yellow load resistance and inductancevalues being halved (e.g. (250 +j80 becomes 125 +j40):(i)Calculate the 3 load currents (IRY, IYB and IBR).(ii)Draw a scaled phasor diagram indicating all phase and linevoltages, and the three line currents.(iii)Using the scaled phasor diagram or otherwise determine thethree line currents (IR, Iy and IB).(iv)What would be the effect on Power Factor and Real Power (W)for the non-faulted condition if the supply frequency increasedto 60 Hz?(c)Calculate the total 3 phase supply power (W) for the faulted condition in (b)using the 2 Wattmeter method, with Wattmeter 1 measuring VBr and IB, andWattmeter 2 measuring VYR and IY.

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Q1 (a) A 3 phase industrial load can be represented by a balanced star connected load (ZRN etc) of (2G7+ j6) N and is connected to a 3 phase, 1G600 V and 50 Hz supply. Calculate:

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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Question

q1 B

g6= 9

g7 = 8

Q1 (a) A 3 phase industrial load can be represented by a balanced star connected load
(ZRN etc) of (2G7 + j6) Q and is connected to a 3 phase, 1G600 V and 50 Hz
supply.
Calculate:
(i)
The three line currents (IR, Iy and IB).
(ii)
The real power (W) in each phase of the load – using 2 different
methods to calculate this.
(iii)
The apparent power (VA), reactive power (VAr) and power
factor for each of the supply phases.
(iv)
The total real power (W) from the supply if the load is delta
connected.
(b)
An industrial load operating from a 3 phase, 1G6 kV and 50 Hz supply has a
delta connected load with nominally balanced load impedances (ZRY etc) of
(2G70 + j80) .
Using the information above determine the following for a faulted red-yellow
load (ZrY) which results in the red-yellow load resistance and inductance
values being halved (e.g. (250 +j80 becomes 125 +j40):
(i)
Calculate the 3 load currents (IRY, IYB and IBR).
(ii)
Draw a scaled phasor diagram indicating all phase and line
voltages, and the three line currents.
(iii)
Using the scaled phasor diagram or otherwise determine the
three line currents (IR, Iy and IB).
(iv)
What would be the effect on Power Factor and Real Power (W)
for the non-faulted condition if the supply frequency increased
to 60 Hz?
(c)
Calculate the total 3 phase supply power (W) for the faulted condition in (b)
using the 2 Wattmeter method, with Wattmeter 1 measuring VBr and IB, and
Wattmeter 2 measuring VYR and IY.

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