DGVCL Exam Paper (11-12-2011)
In the protection of transformers, harmonic restraint is used to guard against

Switching over voltages
Magnetizing inrush current
Unbalanced protection
Lightning

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DGVCL Exam Paper (11-12-2011)
The corona effect can be minimized by increasing

Both spacing between the conductors and diameter of the conductor
Diameter of the conductor
The length of the conductor
Spacing between the conductors

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