Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 39, Problem 9SQ
To determine
State at what range of power factor the high-speed wound rotor motors can operate.
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The one line Diagram of a power system
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G. 80MVA, 22 kV, X = 24%
G2: 68.85MVA, 21 kv, x = 22.5%.
T: 90 MVA, 24/220kv,
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Line ! 50 π
Load: 10M var, Capacitor.
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choose 2 oku, loo MVA, base.
Tz
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A 3- overhead line is being supported by four-disc suspension insulators; the potentials across the first and
second insulator from the top are 9 kV and 13 kV respectively. Calculate (i) the line voltage (ii) the ratio of
capacitance between pin and earth to self-capacitance of each unit (iii) me string efficiency
Chapter 39 Solutions
Electric Motor Control
Ch. 39 - Prob. 1SQCh. 39 - What is the effect of the starting winding of the...Ch. 39 - What are typical applications of synchronous...Ch. 39 - Prob. 4SQCh. 39 - A loaded synchronous motor cannot operate...Ch. 39 - Why must a discharge resistor be connected in the...Ch. 39 - Depending on their power factor ratings, what is...Ch. 39 - At what power factor do incandescent lights...Ch. 39 - Prob. 9SQCh. 39 - The speed of a synchronous motor is fixed by the...
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- Q The one line Dingrum of a power System By the one line. Dingrumvee phase power ad Line -Line rating are given below. G. SOMVA, 22 kV, x = 24% -G2: 68.85MVA, 21 kv, x = 225 T: 90 MVA, 24/220kv, X = 1% -T2: 80 μVA, 20/220kv, x = 6% Line! 12122 Line: 492 Line ! 50 π Load: 10 μvar, Capacitor. Draw an impedance diag rem in Find matrix. Per unit and choose 20kv, 100MVA, base. Vb Sb G Te Tz LI +3E+G2 LL L3 loadarrow_forwardOver string of 3-0 transmission line has (3) insulators and Ce = 0.12 C. If the voltage between the steel pin of the first insulators and metal gap of the last insulator is 33 kV. find: 1. The voltage distribution across the insulators and efficiency. 2. The new voltage distribution and efficiency if number of insulators increases one.arrow_forwardAn overhead line conductor having a parabolic configuration weighs 1.925 kg/m of length. The cross section area of the conductor is 2 cm² and the ultimate strength is 8000 kg/cm². The towers are 300 m apart having difference levels of 15 m. Calculate the sag from the taller tower, so that the factor of safety shall be 5. Assume that ice load is 1 kg/m run and there is no wind pressure.arrow_forward
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