DGVCL Exam Paper (11-12-2011)
The insulation coordination for UHV lines (above 500 kV) is done based on

Switching surges
Lightning surges
Lightning and switching surges
Voltage level of the line

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DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low copper loss
Low iron loss
Low voltage
Low copper as well as iron loss

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