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Question

A 3ϕ transmission line is being supported by three disc insulator. The potential across top unit (i.e near to the tower) and middle unit are 10kV and 12 kV respectively. The string efficiency is ______________%
  1. 78.05

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Solution

The correct option is A 78.05


C1=kC
KCL at junction A,I2=I1+i1
V2ωC=V1ωC+V1kωC
V2=V2(1+k)
1+k=V2V1
1+k=1210
k = 0.2

KCL at junction B

I3=I2+i2
V3ωC=V2ωC+(V1+V2)kωC
V3=(1+3k+k2)V1=16.4kV
String efficiency=38.43×16.4=78.04878 o/o78.0 o/o

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