Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 7, Problem 7RQ
A three-phase load has a phase voltage of 240 V and a phase current of 18 A. What is the apparent power of this load?
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The input power to a 3-phase load is measured as 6700 watts. If the line voltage and line current to the load are 430 V and 18 A respectively.
The power factor of the System is,
1) What is the name for 1, 2, 5 and 6 respectively?
2) What is the function of this circuit? Describe its working principle briefly.
Three Identical capacitors are connected in star to 430 Volts, F = 50 Hz, 3 phase supply. If the line current is 16 A. Calculate its reactance and capacitance value.
Reactance Xc is?
The capacitance of each capacitor, C?
Chapter 7 Solutions
Electrical Transformers and Rotating Machines
Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - A wye-connected load has a voltage of 480 V...Ch. 7 - A wye-connected load has a phase current of 25 A....Ch. 7 - Prob. 5RQCh. 7 - A delta connection has 30 A of current flowing...Ch. 7 - A three-phase load has a phase voltage of 240 V...Ch. 7 - If the load in question 7 is connected in a wye,...Ch. 7 - An alternator with a line voltage of 2400 V...Ch. 7 - Prob. 10RQ
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- A three-phase transformer connection has a delta-connected primary and a wye-connected secondary. The center tap of the wye is used as a neutral conductor. If the line-to-line voltage is 480 volts, what is the voltage between any one phase conductor and the neutral conductor?arrow_forwardAssume that a primary current of 75 amperes flows through the windings of the transformer in question 4. How much current will flow in the secondary winding?arrow_forwardAn open-delta three-phase transformer system has one transformer center-tapped to provide a neutral for single-phase voltages. If the voltage from line to center tap is 277 volts, what is the high-leg voltage?arrow_forward
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