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A 50-kVA 20,000/480-V 60-Hz single-phase distribution transformer is tested with the following results:
(a) Find the per-unit equivalent circuit for this transformer at 60 Hz.
(b) What is the efficiency of the transformer at rated conditions and unity power factor? What is the voltage regulation at those conditions?
(c) What would the ratings of this transformer be if it were operated on a 50-Hz power system?
(d) Sketch the equivalent circuit of this transformer referred to the primary side if it is operating at 50 Hz.
(e) What is the efficiency of the transformer at rated conditions on a 50 Hz power system, with unity power factor? What is the voltage regulation at those conditions?
(f) How does the efficiency of a transformer at rated conditions and 60 Hz compare to the same physical device running a 50 Hz?
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Inherent problems associated with high voltage direct current transsmision
Load 1: Wye-connected load that consumes atotal 3-phase power of 3.6 kW at 0.8 power factor lag, when the generator voltage is set so that the voltage at the load is 480volts line-to-line. Load 2: Delta connected load that consumes 2kW+ j1 KVAR of..
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telcom 2720 cellular and wireless networks homework 5 spring 08 1. consider an is-95 network a. why do the power
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