JPH03848Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a cooling cable connection section in which the intermediate connection section of an existing OF cable is reinforced to enable radial flow cooling.

[Prior art] Radial flow forced cooling (see Figure 4)
Insulating oil (also serving as refrigerant oil) flows in the cable hollow oil passage 10 in the longitudinal direction and also in the cable insulator 14 in the radial direction.In addition to the cooling effect of the insulating oil, the cable This has the effect of reducing the thermal resistance of the insulator 14.

"Fig. 4" is an example of a conventional connection part.

10 is a hollow oil passage, 12 is a cable conductor, 14
1 is a cable insulator, 16 is an aluminum covering, and 18 is a cis side oil passage.

Reference numeral 20 denotes a reinforcing insulating layer, which is usually formed using wide oil-impregnated paper.

Reference numeral 22 denotes a stiffening layer provided on the tapered portion of the reinforcing insulating layer 20. For example, crepe carbon paper 24 is first wrapped, lead tape 26 is wrapped around it, and tin-plated copper wire 28 is tightly wrapped on top of it. It is formed by 40 indicates an external copper tube.

[Problems to be Solved by the Invention] However, when wide oil-impregnated paper is used for the reinforcing insulating layer 20 as described above, a butt gap inevitably occurs due to the width of the wide oil-impregnated paper. In addition, in the OF cable of radial flow type forced cooling, the pressure in the hollow oil passage 10 is always higher than that in the sheath side oil passage 18. For this reason, a force is constantly acting to widen the butt gap. However, the connecting portion of the above structure is not designed to withstand such forces, and in some cases, the butt gap may widen, which may even lead to insulation failure.

Therefore, it has a connection part with such a structure.
Radial flow forced cooling cannot be applied to OF cable lines.

This invention solves the above problems and prevents the reinforcing insulating layer from deforming or breaking due to hydraulic pressure.

[Means for solving the problem] As shown in Fig. 1, a thin strip-shaped reinforcing plate 34 is added to the reinforcing insulating layer over the entire length in the longitudinal direction, and a metal wire 36 is wound on top of the reinforcing plate 34. , is characterized by.

[Example] As shown in Fig. 2, a plurality of thin strip-shaped reinforcing plates 34 are vertically attached at appropriate intervals in the circumferential direction on top of the conventional insulation layer (Fig. 1, Figure 3).

This reinforcing plate 34 is made of a non-magnetic and mechanically strong metal such as stainless steel. Its width is about 10 to 15 mm, and its thickness is about 1 to 2 mm. Then, the reinforcing insulating layer is placed over the entire length in the longitudinal direction, and the tin-plated copper wire 36 is wound thereon and firmly pressed. This tin-plated copper wire 36 may be loosely wound as shown in FIG. 1, or may be tightly wound.

[Operation and effect of the invention] Even if the hydraulic force that tries to push the insulation layer outward in the axial direction works as described above, in the invention, the thin strip-like A reinforcing plate is attached and a metal wire is wrapped directly above it, so the stiff layer cannot move. Therefore, the deformation of the reinforcing insulator due to hydraulic pressure and the breakage of the hard layer are completely prevented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, FIG. 2 is a schematic diagram of main parts of the embodiment of the present invention, and FIG. 3 is an explanatory diagram of a reinforcing plate 34. FIG. 4 is an explanatory diagram of a conventional power cable connection section. 10: Hollow oil passage, 14: Cable insulator, 1
8: Sheath side oil passage, 20: Reinforcement insulation layer, 22:
Shiyahei layer, 24: Crepe carbon paper, 34:
Reinforcement plate, 36: tin-plated copper wire.

Claims (1)

[Scope of Claim for Utility Model Registration] At the connection part of a power cable in which a reinforcing insulating layer is formed using wide oil-impregnated paper, a thin strip-shaped reinforcing plate is attached to the reinforcing insulating layer over the entire length in the longitudinal direction, and A connection part of a power cable characterized by having a metal wire wound thereon.