You Do Need power plug adapter while traveling from South Sudan to Cape Verde.

Here is Why You Need An Adapter

The outlet and plug type used in Cape Verde are C and F and in South Sudan are C and D. This is how they look like.

South Sudan

In South Sudan, outlets of type C and D are in use.

Type C

Type D

Cape Verde

In Cape Verde, outlets of type C and F are in use.

Type C

Type F