Electrical Motor Controls for Integrated Systems
5th Edition
ISBN: 9780826912268
Author: Gary Rockis;Glen A. Mazur
Publisher: American Technical Publishers
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Chapter 4.1, Problem 4CP
To determine
To explain: The two types of motor protection, which are utilized to protect the motor when starting and running.
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A plane wave propagating through a medium with &,,-8 μr = 2 has:
E = 0.5 e-j0.33z
sin (108 t - ẞz) ax V/m.
Determine (a) ẞ (b) The loss tangent (c) Wave impedance (d) Wave velocity (e) H field
2)
The phase voltage at the terminals of a balanced three-phase Y-connected load is 2400 V. The load
has an impedance of 16+j12 2/6 and is fed from a line having an impedance of 0.10+j0.80 2/6. The Y-
connected source at the sending end of the line has a positive phase sequence and an internal impedance of
0.02+j0.16 2/6. Use the a-phase voltage at the load as the reference.
a) Construct the a-phase equivalent circuit of the system
b) Calculate the line currents IaA, IbB, and Icc
c) Calculate the phase voltages at the terminals of the source, Van, Vbn, Vcn-
d) Calculate the line voltages at the source, Vab, Vbc and Vca.
e) Calculate the internal phase-to-neutral voltages at the source, Va'n, Vb'n, Ve'n,
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Electrical Motor Controls for Integrated Systems
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