December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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59Common Aspects of Power Equipment
7. An electrical equipment is designed for 25-year life with 70°C rise in 40°C
ambient air at a rated load. If it is continuously overloaded by 10%, deter-
mine its new expected life.
8. A 500-hp, 460-V motor winding insulation resistance was measured to be
15 MΩ when sitting idle in normal room temperature of 25°C. Determine
whether this motor is worthy of continuing service as per the IEEE Standard.
9. A 75-kVA, single-phase, 60-Hz transformer primary coil with 100 turns
is connected to a 265-V source. Determine the peak ux in the core. If the
magnetomotive force of 500 ampere-turns is needed to establish this ux,
determine the core excitation current.
10. A feeder transformer delivers full load cur ...
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