Which of the
following is not one of the methods to improve string efficiency of insulators?
Grading of
insulators
Guard ring
Disc porosity
Selection of
m
Disc porosity
Methods to
improve the string efficiency of insulators :
1. Grading of
insulator
2. Increasing
the cross arm (Selection of m)
3. Use guard
ring
Disc porosity
is not a method to improve the string efficiency of an insulator.
String
efficiency
Voltage
across the string
Number of
disk
Hence, the
correct option is (C).
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