GATE EE 2019 Set 1 — Question 55
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Electrical Machines → AC Power & Three-Phase → Complex Power
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Question
A single-phase transformer of rating , supplies a load at power factor of lagging. The additional load at unity power factor in kW (round off to two decimal places) that may be added before this transformer exceeds its rated kVA is _____.
Correct answer
7.1 to 7.3
Solution
Initial load:
, lagging.
Reactive power .Let the additional load be at unity power factor (UPF). For UPF, .
Total active power .
Total reactive power .The total apparent power must not exceed the transformer rating of :Rounding off to two decimal places, the additional load is kW.
, lagging.
Reactive power .Let the additional load be at unity power factor (UPF). For UPF, .
Total active power .
Total reactive power .The total apparent power must not exceed the transformer rating of :Rounding off to two decimal places, the additional load is kW.
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