1. The following measurements were obtained from tests: carried out on a 10-kVA, 2300:230-V, 60-Hz distribution transformer: -Open-circuit test, with the low-potential winding excited: Applied potential difference, Voc = 230 V Current, Ioc 0.45 A = Input power, Poc = 70 W -Short-circuit test, with the high-potential winding excited: Applied potential difference, Vsc =120 V Current, Isc 4.5 A = Input power, Psc = 240 W Winding resistances, measured by dc bridge: = Rhp 5.80 2, R1p = 0.0605 2 (a) Determine the equivalent circuit of the transformer referred to the low- potential side.
1. The following measurements were obtained from tests: carried out on a 10-kVA, 2300:230-V, 60-Hz distribution transformer: -Open-circuit test, with the low-potential winding excited: Applied potential difference, Voc = 230 V Current, Ioc 0.45 A = Input power, Poc = 70 W -Short-circuit test, with the high-potential winding excited: Applied potential difference, Vsc =120 V Current, Isc 4.5 A = Input power, Psc = 240 W Winding resistances, measured by dc bridge: = Rhp 5.80 2, R1p = 0.0605 2 (a) Determine the equivalent circuit of the transformer referred to the low- potential side.
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Three-Phase Transformers
Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.
Transformer
Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.
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Transcribed Image Text:(b) Express the exciting current of the transformer as a
rated full-load current.
percentage of the
Transcribed Image Text:1. The following measurements were obtained from tests: carried out on
a 10-kVA, 2300:230-V, 60-Hz distribution transformer:
-Open-circuit test, with the low-potential winding excited:
Applied potential difference, Voc = 230 V
Current, Ioc 0.45 A
=
Input power, Poc = 70 W
-Short-circuit test, with the high-potential winding excited:
Applied potential difference, Vsc =120 V
Current, Isc 4.5 A
=
Input power, Psc
= 240 W
Winding resistances, measured by dc bridge:
=
Rhp 5.80 2, R1p = 0.0605
(a) Determine the equivalent circuit of the transformer referred to the low-
potential side.
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Step 1: About open circuit test
VIEWStep 2: Drawing equivalent circuit and phasor diagram for open circuit test
VIEWStep 3: Finding power factor and θ
VIEWStep 4: Finding parameters of transformer
VIEWStep 5: The required circuit of transformer is drawn
VIEWStep 6: Finding exciting current as a percentage of full load current
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