High voltage electric cable
View Patent ↗A high voltage electric cable including a cable core, a cooling pipe for cooling the cable core including a polymer and adapted for carrying a cooling fluid, and a cable covering enclosing the cable core and the cooling pipe. The electric cable further includes a heat conducting element surrounding the cable core, and being arranged in thermal contact with the cable core and the cooling pipe.
1. A high voltage electric cable comprising:
at least one cable core,
at least one cooling pipe for cooling the cable core, where the at least one cooling pipe comprises a polymer and is adapted for carrying a cooling liquid, and
a cable covering surrounding the at least one cable core and the at least one cooling pipe, wherein the electric cable comprises at least one heat conducting element surrounding the at least one cable core, and arranged in thermal contact with the at least one cable core and the at least one cooling pipe, wherein the at least one heat conducting element is a heat conducting first metallic layer, and wherein the electric cable further comprises a heat conducting second metallic layer surrounding the at least one cooling pipe, and arranged in thermal contact with the at least one cooling pipe and the first metallic layer;
wherein the at least one cooling pipe is a flexible polymer pipe.
2. The high voltage electric cable according to claim 1 , wherein the second metallic layer is a metal braid.
3. The high voltage electric cable according to claim 1 , wherein the first or second metallic layer is a metal laminate or metal tape.
4. The high voltage electric cable according to claim 1 , wherein the cable comprises:
three cable cores, each surrounded by a first metallic layer arranged in thermal contact with the cable core, and
three cooling pipes arranged in the spaces formed between the three cable cores and the cable covering and in thermal contact with the first metallic layers.
5. The high voltage electric cable according to claim 4 , wherein the cable comprises a fourth cooling pipe arranged in the space formed between the three cable cores in the centre of the electric cable, and arranged in thermal contact with the first metallic layers.
6. The high voltage electric cable according to claim 1 , wherein the electric cable comprises a heat conducting metallic sheath surrounding the at least one cable core and the at least one cooling pipe, and arranged in thermal contact with the heat conducting element and the cooling pipe.
7. The high voltage electric cable according to claim 1 , wherein the first metallic layer has an average thickness in the interval of 0.01-3.0 mm.
8. The high voltage electric cable according to claim 1 , wherein the second metallic layer has an average thickness in the interval of 0.01-3.0 mm.
9. The high voltage electric cable according to claim 6 , wherein the heat conducting metallic sheath has an average thickness in the interval of 0.01-3.0 mm.
10. The high voltage electric cable according to claim 1 , wherein the first metallic layer or the second metallic layer is made of aluminum and has an average thickness in the interval of 0.02-2.0 mm.
11. The high voltage electric cable according to claim 1 , wherein the first metallic layer or the second metallic layer is made of copper and has an average thickness in the interval of 0.01-1.5 mm.
12. The high voltage electric cable according to claim 1 , wherein a heat conducting filler is arranged between the at least one cable core and the at least one cooling pipe.
13. A cooling system comprising a high voltage electric cable according to claim 1 , wherein the cable comprises at least two integrated cooling pipes carrying a cooling liquid, and where one of the integrated cooling pipes is used for the return of the cooling liquid.
14. The high voltage electric cable according to claim 1 , wherein the first metallic layer and the second metallic layer is made of aluminum and has an average thickness in the interval of 0.02-2.0 mm.
15. The high voltage electric cable according to claim 1 , wherein the first metallic layer and the second metallic layer is made of copper and has an average thickness in the interval of 0.01-1.5 mm.
16. A high voltage electric cable comprising:
at least one cable core,
at least one cooling pipe for cooling the cable core, where the at least one cooling pipe comprises a polymer and is adapted for carrying a cooling liquid, and
a cable covering surrounding the at least one cable core and the at least one cooling pipe, wherein the electric cable comprises at least one heat conducting element surrounding the at least one cable core, and arranged in thermal contact with the at least one cable core and the at least one cooling pipe, wherein the at least one heat conducting element is a heat conducting first metallic layer, and wherein the electric cable further comprises a heat conducting second metallic layer surrounding the at least one cooling pipe, and arranged in thermal contact with the at least one cooling pipe and the first metallic layer, the second metallic layer comprising a metal braid.
17. A high voltage electric cable comprising:
at least three cable cores, each surrounded by a first metallic layer,
at least three cooling pipes comprising a polymer and adapted for carrying a cooling liquid, each cooling pipe surrounded by a second metallic layer, said three cooling pipes arranged in spaces formed between the three cable cores,
a cable covering surrounding the at least three cable cores and at least three cooling pipes,
said first metallic layers being in respective contact with said second metallic layers, and
a fourth cooling pipe arranged in a space formed between the three cable cores in the center of the electric cable, and arranged in thermal contact with the first metallic layers.