3. A single-phase 100-kVA, 7200-V/120-V, 60HZ distribution transformer is used as a step downtransformer at the load end of a 7200-V feeder whose series impedance is (2.5 + j3.5) ohms. Theequivalent series impedance of the transformer is (0.9 + j2.0) ohms referred to the high voltage(primary) side. The transformer is delivering rated load at 0.8 power factor lagging and at ratedsecondary voltage. Neglect the transformer exciting current and determine:the voltage at the transformer primary terminals.a.b. the voltage at sending end of the feeder.c. the active and reactive power delivered to the sending end of the feeder.

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Asked Feb 14, 2020
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3. A single-phase 100-kVA, 7200-V/120-V, 60HZ distribution transformer is used as a step down
transformer at the load end of a 7200-V feeder whose series impedance is (2.5 + j3.5) ohms. The
equivalent series impedance of the transformer is (0.9 + j2.0) ohms referred to the high voltage
(primary) side. The transformer is delivering rated load at 0.8 power factor lagging and at rated
secondary voltage. Neglect the transformer exciting current and determine:
the voltage at the transformer primary terminals.
a.
b. the voltage at sending end of the feeder.
c. the active and reactive power delivered to the sending end of the feeder.
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3. A single-phase 100-kVA, 7200-V/120-V, 60HZ distribution transformer is used as a step down transformer at the load end of a 7200-V feeder whose series impedance is (2.5 + j3.5) ohms. The equivalent series impedance of the transformer is (0.9 + j2.0) ohms referred to the high voltage (primary) side. The transformer is delivering rated load at 0.8 power factor lagging and at rated secondary voltage. Neglect the transformer exciting current and determine: the voltage at the transformer primary terminals. a. b. the voltage at sending end of the feeder. c. the active and reactive power delivered to the sending end of the feeder.

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Expert Answer

Step 1

transformation ratio, primary side impedance, secondary side impedance, primary and secondary side current are determined as follows:

Electrical Engineering homework question answer, step 1, image 1

Step 2

a.

the voltage at the primary terminals is determined as follows:

drop in secondary side:

Electrical Engineering homework question answer, step 2, image 1

drop in primary side:

Electrical Engineering homework question answer, step 2, image 2

Electrical Engineering homework question answer, step 2, image 3

Step 3

b.

voltage at sending end of the feeder:

Electrical Engineering homework question answer, step 3, image 1

...

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