Which of the following requirements of properties is not essential for
line insulators?
Dielectric
strength must be very high
They must be
free from internal impurities
They should
be porous
They must have high ratio of puncture strength to flash over voltage.
They should
be porous
Characteristics
of line insulator should be :
1. High
dielectric strength.
2. Free from
internal impurity.
3. Free from
oxidation.
4. Free from
porousness.
5. High
ration of puncture strength flash over voltage.
Porous is not
essential property for line insulators.
Hence, the
correct option is (C).
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