Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 58, Problem 2SQ
To determine
Explain about a programmable controller.
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a) Determine the setting of the overload protection of the circuit breaker intended to protect a 50hp, 380V, IV-pole motor, powered by a unipolar copper-PVC conductor circuit, with a cross-section of 25mm², installed in a buried conduit: The short-circuit current at the motor terminal is 5KA. It is assumed that the overload current of the conductor throughout its useful life is controlled and will not exceed 100 hours for 12 consecutive months or 500 hours throughout the useful life of the conductor. Data: fp = 0.86; efficiency = 0.92
a) Determine the minimum operating time of the circuit breaker in the event of a short-circuit at the motor terminals.
Q1:A: Derive four elements only of diagonals Jacobian matrix of NR method in polar coordinate
for a system consist of 4 buses, bus 1 is slack and the other three buses are PQ buses.
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Chapter 58 Solutions
Electric Motor Control
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- 1. For the following logic gates: a. Write a Truth Table and logic equation? A Y A A. Y A Y "0" A A neotoof "0"> Day Y "1" A ADY DY A B DD A B b. What each of these gates represent? 2. Connect and draw the following digital logic equations: a. Y=X+1 b. Y=X+X' = \ c. Y=X X' d. Y=X 0 e. Y=XX' f. Y=XOX 3. Prove that: a. X(Y+Z)=XY+XZ b. X+YZ=(X+Y)(X+Z) c. (X+Y)'=X'Y' d. (XY)'=X'+Y e. X+XY=X f. X(X+Y)=Xarrow_forwardI need help with this problem and an step by step explanation of the solution from the image described below. (Introduction to Signals and Systems: Spectrum Representation)arrow_forwardI need help with this problem and an step by step explanation of the solution from the image described below. (Introduction to Signals and Systems: A complex Numbers)arrow_forward
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