Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 50%
 86%%
 90%
 75%

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Power Systems
The value of off diagonal elements is

 which is connected between bus i and bus j with negative sign
 sum of admittances connected at bus i
 sum of admittances connected at bus j
 which is connected between bus i and bus j with positive sign

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