(a) What materials are used for the insulation of cables? Discuss the…
Previous year question for Power System-II.
Question
(a) What materials are used for the insulation of cables? Discuss the advantages of each.
(b) A $33\text{ KV}$, $3-\phi$, underground feeder, $3.4\text{ km}$ long, uses three single core cable. Each cable has a conductor diameter of $2.5\text{ cm}$ and the radial thickness of insulation is $0.6\text{ cm}$. The relative permittivity of dielectric is $3.1$. Find (i) capacitance of the cable per phase, (ii) charging current per phase, (iii) total charging $\text{K Var}$ (iv) dielectric loss per phase if the power factor of unloaded cable is $0.03$ (v) maximum stress in the cable.
- Year: 2018
- Subject: Power System-II