Numerical - Line voltage & string efficiency for given parameters of 3 phase over head transmission line

Q.  A 3 phase over head transmission line is supported by three discs of suspension insulators. The potentials across the first and second insulator are 8 and 11 kV respectively. What is the line voltage and string efficiency?
- Published on 24 Nov 15

a. 0.654 and 63.5%
b. 0.375 and 68.3 %
c. 0.527 and 56.34 %
d. 0.287 and 65.258 %

ANSWER: 0.375 and 68.3 %

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