diagnose a low voltage and overheating problem with a single phase transformer utilized to supply their single phase loads. The company technicians informed you that the transformer has a solid nickel core, insulated aluminum windings and its nameplate ratings are 100 kVA, 6600/230 V, 60 Hz. (a) With the aid of suitable circuit diagrams, briefly outline relevant information on the tests you require the technicians to perform to determine the intemal equivalent circuit parameters of the single phase transformer.

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You have been hired as a consultation engineer for a mamufacturing company to test and
diagnose a low voltage and overheating problem with a single phase transformer utilized to
supply their single phase loads.
The company technicians informed you that the transformer has a solid nickel core, insulated
aluminum windings and its nameplate ratings are 100 kVA, 6600/230 V, 60 Hz.
(a) With the aid of suitable circuit diagrams, briefly outline relevant infornmation on the tests
you require the technicians to perform to determine the intemal equivalent circuit
parameters of the single phase transformer.
(b) The technicians conducted the tests you outlined on the single phase transformer and the
following results were obtained on the high voltage side.
Open Circuit Test:
Imput Voltage = 6600 V, Input Power = 14,520 W, Imput Current = 4 A
Short Circuit Test:
Input Voltage = 1000 V, Input Power = 9180 W, Imput Current = 15.15 A
Calculate R, X_ R and X
(c) Given that the transfomer is delivering 80% full load at 0.9 power factor lag, calculate:
i) the output voltage assuming the imput voltage is maintained at 6600V
ii) the voltage regulation at this load
i) the efficiency at this load
Transcribed Image Text:You have been hired as a consultation engineer for a mamufacturing company to test and diagnose a low voltage and overheating problem with a single phase transformer utilized to supply their single phase loads. The company technicians informed you that the transformer has a solid nickel core, insulated aluminum windings and its nameplate ratings are 100 kVA, 6600/230 V, 60 Hz. (a) With the aid of suitable circuit diagrams, briefly outline relevant infornmation on the tests you require the technicians to perform to determine the intemal equivalent circuit parameters of the single phase transformer. (b) The technicians conducted the tests you outlined on the single phase transformer and the following results were obtained on the high voltage side. Open Circuit Test: Imput Voltage = 6600 V, Input Power = 14,520 W, Imput Current = 4 A Short Circuit Test: Input Voltage = 1000 V, Input Power = 9180 W, Imput Current = 15.15 A Calculate R, X_ R and X (c) Given that the transfomer is delivering 80% full load at 0.9 power factor lag, calculate: i) the output voltage assuming the imput voltage is maintained at 6600V ii) the voltage regulation at this load i) the efficiency at this load
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