You Do Need power plug adapter while traveling from South Sudan to Sint Maarten.

Here is Why You Need An Adapter

The outlet and plug type used in Sint Maarten 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

Sint Maarten

In Sint Maarten, outlets of type A and B are in use.

Type A

Type B