(a) Discuss why: (i) Transmission lines in heavily polluted area are…

Question

(a) Discuss why:

(i) Transmission lines in heavily polluted area are provided with greater number of insulator discs.

(ii) Insulators are fitted with arching horns.

(iii) Insulators are polished.

(iv) Pin type insulators are not preferred over $33\text{ KV}$.

(b) A string of five suspension insulators is to be fitted with a grading ring. If the pins to earth capacitance are equal to C, find the values of line to pin capacitances that would give a uniform voltage distribution along the string.