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A 50 MVA, 76.2/33 kV, 1-φ, 50 Hz, two-winding transformer with tap changer has percentage impedance of (0.5 + j7.0). What tapping must be used to maintain rated voltage at the secondary on full load at 0.8 lagging power factor?
  • a)
    3.8 % down
  • b)
    3.8 % up
  • c)
     4.6 % up
  • d)
    4.6 % down
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A 50 MVA, 76.2/33 kV, 1-φ, 50 Hz, two-winding transformer with tap...

Hence, voltage to be raised, for maintaining rated voltage = 4.6%.
Thus, tap setting required on the HV side = -4.6% or 4.6 % down.
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Most Upvoted Answer
A 50 MVA, 76.2/33 kV, 1-φ, 50 Hz, two-winding transformer with tap...
Phase transformer has a rated voltage ratio of 76.2 kV/33 kV.

The transformer is rated for a power of 50 MVA, which means it can deliver 50 million watts of power at its rated voltage and frequency.

The primary voltage rating of the transformer is 76.2 kV, which is the voltage level at which the transformer is designed to receive power from the power grid.

The secondary voltage rating of the transformer is 33 kV, which is the voltage level at which the transformer is designed to deliver power to the load.

The transformer is a single-phase transformer, which means it can only handle power for one phase of a three-phase power system.
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A 50 MVA, 76.2/33 kV, 1-φ, 50 Hz, two-winding transformer with tap changer has percentage impedance of (0.5 + j7.0). What tapping must be used to maintain rated voltage at the secondary on full load at 0.8 lagging power factor?a)3.8 % downb)3.8 % upc)4.6 % upd)4.6 % downCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A 50 MVA, 76.2/33 kV, 1-φ, 50 Hz, two-winding transformer with tap changer has percentage impedance of (0.5 + j7.0). What tapping must be used to maintain rated voltage at the secondary on full load at 0.8 lagging power factor?a)3.8 % downb)3.8 % upc)4.6 % upd)4.6 % downCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 50 MVA, 76.2/33 kV, 1-φ, 50 Hz, two-winding transformer with tap changer has percentage impedance of (0.5 + j7.0). What tapping must be used to maintain rated voltage at the secondary on full load at 0.8 lagging power factor?a)3.8 % downb)3.8 % upc)4.6 % upd)4.6 % downCorrect answer is option 'D'. Can you explain this answer?.
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