ELECTRICALLY CONDUCTIVE BUOYANT CABLE

1 . An electrically conductive buoyant cable, comprising:

a three piece cable;

the first piece defines an electrical conductor;

a second piece defines a filler layer made of buoyant, the filler layer surrounds the electrical conductor;

a third piece defining a jacket having no or small amount of filler material, the jacket surrounding the filler layer; the filler layer and the jacket are made of the same material; and

the three piece cable having a relative density less than 1.

2 . An electrically conductive buoyant cable, according to claim 1 , in which the material of the jacket and the filler layer is plastic polyethylene, plastic polypropylene or soft plastic with shore hardness below A120.

3 . An electrically conductive buoyant cable, according to claim 1 , in which the buoyant material of the mentioned filler layer is foam material and/or hollow glass micro-spheres.

4 . An electrically conductive buoyant cable, according to claim 1 , in which the mentioned filler layer consists of buoyant materials made of the jacket material plus the foam material or material filled with air bubble.

5 . An electrically conductive buoyant cable, according to claim 1 , in which the mentioned filler layer consists of buoyant materials made of the jacket material plus the hollow glass micro-spheres.

6 . An electrically conductive buoyant cable, according to claim 1 , in which the filler layer and the jacket are made from a foam material, and the foam material includes hollow glass micro spheres.

7 . An electrically conductive buoyant cable, according to any of claims 3 to 6 , wherein the filler material comprises a foam material and the foam material has tiny holes.

8 . An electrically conductive buoyant cable, according to any of claims 3 , 4 , 6 , in which once the buoyant material filler layer consists of foam material or air bubbles, and wherein the jacket is a solid material.

9 . An electrically conductive buoyant cable, according to claim 1 or 2 , in which the mentioned conductor is located at the center axis of the electrically conductive buoyant cable.

10 . An electrically conductive buoyant cable, according to claim 9 , in which it includes a tension bearing fiber layer. This fiber layer twines around the conductor located at the center axis of the electrically conductive buoyant cable.

11 . An electrically conductive buoyant cable, according to claim 10 , in which the tensional fiber of the mentioned tension bearing fiber layer tightly twines around the mentioned conductor.

12 . An electrically conductive buoyant cable, according to claim 9 , wherein the electrically conductive buoyant cable includes two or more groups of conductors, and an insulating layer surrounding the outer layer of each group of conductors.

13 . An electrically conductive buoyant cable, according to claim 12 , in which the mentioned insulating layer is made of insulating oil.

14 . An electrically conductive buoyant cable, according to claim 9 , in which the mentioned conductor is made of aluminum metal.

15 . An electrically conductive buoyant cable, comprising; at least an one electrical conductor, a filler layer of buoyant material having a relative density less than 1, the filler layer surrounding the electrical conductor, a jacket layer having a small amount of filler material, surrounding the filler layer, the filler layer and the jacket being made from similar materials and the materials having approximately the same melting points, and the materials of the jacket and the filler layer having high fusibility.

16 . An electrically conductive buoyant cable, according to claim 15 , in which the two similar materials of close melting points refer to two similar plastic materials. The difference of their melting points is not greater than 30 degree Celsius.