You Do Need power plug adapter while traveling from South Sudan to Cayman Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Cayman Islands are A and B 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

Cayman Islands

In Cayman Islands, outlets of type A and B are in use.

Type A

Type B