(a) Derive the formula for calculating current rating of a cable. Wha…
Previous year question for Power System-II.
Question
(a) Derive the formula for calculating current rating of a cable. What factors affect this rating?
(b) A single core cable for $66\text{ KV}$, $3-\phi$ system has a conductor of $2\text{ cm}$ diameter and sheath of inside diameter $5.3\text{ cm}$. It is required to have two inter sheaths so that stress varies between the same maximum and minimum values in the three layers of dielectric. Find the positions of inter sheaths, maximum and minimum stress and voltages on the intersheaths. Also find the maximum and the minimum stress if the intersheaths are not used.
- Year: 2018
- Subject: Power System-II