Cable cooling device using hollow conductor cable hollow and sheath inner space

摘要

The present invention relates to a cable cooling apparatus for cooling a cable through a refrigeration cycle utilizing the sealed sheath inner refrigerant movement path 21 and the hollow refrigerant movement path 22 formed in the conductor center in the power cable.;Currently, there are two main types of cables: OF cable and XLPE cable. In the center of the cable, a conductor is installed. When current flows through the conductor, heat caused by electrical losses in the conductor is discharged through the insulating oil in the case of the OF cable, and the XLPE cable is discharged to the outside through the insulator. However, current cables do not have a device to exchange heat while circulating inside the cable, so the maximum transmission capacity is much smaller than that of overhead lines. In the present invention, the conductor of the OF cable or XLPE cable is made of a hollow conductor having a space in the center so that the refrigerant can move into this space, and the refrigerant can be recovered to the space between the sealed sheath and the external semiconducting side. By forming a closed circuit of the flow, the heat generated inside the cable is moved to another space through the refrigerant to maximize the cooling effect. The refrigerant is an insulating oil, a method of cooling by installing an evaporator 71 of a refrigeration cycle in a hydraulic tank (PT or BPT) that absorbs the thermal expansion amount of the insulating oil and maintains pressure, and directly using the refrigerant of the refrigeration cycle instead of insulating oil A method that can be applied only to the XLPE cable for cooling has been suggested. As the refrigerant in the refrigerating cycle was evaporated in the evaporator, a device for obtaining electric power or physical energy from the generator (or mechanism) 78 connected to the turbine shaft by turning the turbine 77 with the kinetic energy of the gaseous refrigerant was added. The cable's one-year operation shows that heavy loads take only a few hours, so effective cooling of the cables in the refrigeration cycle during these short periods will increase cable capacity even further.;Hollow Wire, Hollow, Hydraulic Tank, PT, BPT, Refrigeration Cycle, Cooling System