Two Semi-Conductor Shield in HT Cables Why?

The first one is called "conductor screening" and the second one is called "insulation screening".

Tnks sir for ur reply but i seen the semi-conductor layer( insulation screen ) is peeled to some distance and we are doing meggering why...????

what is the differenc ebetween insulation screen and conductor screen...???

then where is semi-conductor layer...????

With unscreened cable there are stress points between the conductors. The screening equalises the stress around the core. The outer screening evens out the stress to earth.

Jointing or terminating the cable requires stress relief at the end of the screening so that there isn't a sudden stop which will cause insulation failure.

Hope this helps.