Question
Download Solution PDFIf the number of poles in a 3-ϕ 11 kV transmission line is 80, then how many disc insulators are required?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- In suspension insulator number of insulators is connected in series to form a string and the line conductor is carried by the bottom-most insulator.
- Each insulator of a suspension string is called a disc insulator because of its disc-like shape.
- Each suspension disc is designed for a normal voltage rating of 11 kV, so by using different numbers of discs, a suspension string can be made suitable for any voltage level.
As the rating of each disc insulator is 11 kV, for an 11 kV transmission line the disc insulator required at each pole is 1.
Therefore, the total number of insulators used in a transmission line having 80 poles is = 1 × 80 = 80
For three phases, the total number of disks required = 80 × 3 = 240
Last updated on May 29, 2025
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