Why conductor sereen and Insulation screen is used for 11KV Power cable?

Answer 1

I think the reason for the insulator layer is obvious. The conductor layer is probably to shield against emission of electromagnetic energy which can interfere with communications (such as radio and TV reception) and other electronic equipment, and may also be a safety measure to produce a high fault current to trip a breaker in the event of cable damage.

Answer 2

I think that aconductor screen very important to avoid the high stress which cause partial discharge