Electrical Motor Controls For Integrated Systems: Applications Manual
5th Edition
ISBN: 9780826912299
Author: Gary J. Rockis;glen A. Mazur
Publisher: American Technical Publishers
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Chapter 8.3, Problem 2CP
To determine
To explain: Whether measuring 2 V across a closed contact operating a load in a 120 V circuit is acceptable or not.
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Students have asked these similar questions
A three-phase load consists of three identical impedances connected in delta. The
impedances have a value of (100 + j40) Q. The supply voltage is 440 V. The two-
wattmeter method is used to determine the total power drawn by the load. One wattmeter,
W₁, has its current coil connected in the blue line and its voltage coil connected between
the yellow and blue lines. Calculate:
a) The power measured by each wattmeter
b) The power factor of the load using the wattmeter readings
c) The apparent power supplied to the load
d) The reactive power drawn by the load.
4- A 75 KW, 250 V shunt generator has R₁ = 0.03 2 and RF =50 2. The generator has 6 poles and is lap wound with totally 400
conductors. The generator runs at 600 rpm on full load. The bore of the machine is 42 cm (in diameter), its axial length is 28 cm
and each pole subtends an angle of 54 °.
Field
pole
a)
b)
c)
Find the airgap flux density. (10 pt)
Find the induced voltage under full load. (10 pt)
Find the average number of active conductors. (5 pts)
28 cm
21 cm
60°
Armature
a) The phase currents in a delta - connected three-phase load are as follows: between the
red and yellow lines, 60 A at p.f. 0.9 leading; between the yellow and blue lines, 40 A at
0.95 p.f lagging; between the blue and red lines, 50 A at p.f. 0.8 lagging. The supply
voltage is 240 V. Draw a labeled diagram of the circuit and calculate the line currents.
Note: Use VRY as the reference phasor.
b) The two-wattmeter method is used to measure the total power drawn by the load in 1 (a)
above. Wattmeter one has its current coil connected in the yellow line and its voltage coil
connected between the yellow and red lines. Calculate:
i. The power measured by each wattmeter.
ii. The power factor of the load.
Chapter 8 Solutions
Electrical Motor Controls For Integrated Systems: Applications Manual
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