Power Systems
The insulation of the modern EHV lines is designed based on

 R × I.
  the switch voltage.
 corona.
 the lighting voltage.

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Power Systems
Per unit of any quantity is defined as

 actual value of quantity /base value of quantity in different units
 base value of quantity /actual value of quantity in same units
 actual value of quantity /base value of quantity in same units
 base value of quantity /actual value of quantity in different units

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