JPS5922769Y2 - Power cable termination - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a terminal end of a power cable.

A conventional belt paper insulated power cable, as shown in its cross section in FIG. Three insulating layers 1//l 7/, 3// are twisted together with inclusions 4 and 5.6 into a circular cross section 7, and an insulating paper is commonly wound thereon to form a belt insulating layer 8. This is impregnated with insulating oil in a vacuum impregnating tank, carbon paper 9 is tightly wound around it, and lead coating 10 is applied thereon.

When performing the terminal treatment of the cables from Bell 1 to above, cut out the lead sheath 10, the carbon paper layer 9 below it, and the bell I/insulation 8 at a certain length of the cable terminal, and then cut off the insulation layer 1 of each single core.
u1. When exposing t21/, 3// in a bamboo shoot shape and opening it in a fan shape, the bell 1-insulation 8 and the insulation layer 1//, 2
If the paper insulation layers 1', 2', 3' of //, 3// are soaked in hot water, a short circuit accident may occur between the conductor cores 1, 2.3 and the leaded sheath 10.

In order to solve the above-mentioned drawbacks, the present invention covers the exposed belt insulation layer at the end of the cable with an oil-resistant heat-shrinkable tube, and the oil-resistant heat-shrinkable tube and the leaded cut are used for stress control. This is the end of the electrical cable wrapped in heat shrink tubing.

This is specifically shown in FIGS. 2 and 3.

The same reference numerals as in FIG. 1 indicate the same parts, and 11 is an oil-resistant heat-shrinkable tube, such as a cross-linked polyethylene heat-shrinkable tube, which covers the exposed portion of the belt insulating layer 8 and insulates each single-core insulating layer. To prevent a belt insulating layer from shifting or tearing due to external force when opening in a fan shape.

12 is a stress control tube having a high dielectric constant, for example, a dielectric constant of 25 to 80. A heat-shrinkable tube having a volume resistivity of 1010 to 1012 and made of cross-linked polyethylene as a base and containing carbon, aluminum hydroxide, etc. is wrapped over the oil-resistant heat-shrinkable tube 11 over the leaded sheath 10. do.

This relieves the lines of electric force from the cable conductors 1, 2.3 to the ends of the leaded sheath 10.

In the figure, 12 is a steel wire sheath on the leaded sheath 10, 13 is a braided wire with a grounding terminal, 14 is a binding wire that fixes the grounding wire 13 on the outer device 2, 15 is a PVC sheath, and 16 is a cable. A supporting bracket 17 is a branch box equipped with a trilaminar tube, and each single-core insulated wire 1'1 is connected to the trilaminar tube.
．． ．． 2//, 3// and extend their lower part to leaded 10.

Reference numeral 18 denotes an envelope, and the lower part of the branch box 17 is made of PVC.
It covers up to the top of the sheath 15.

19.19', 19" is copper terminal, 20°20', 20
"" is an insulator, 21, 21', 21" is a protective tube.

FIG. 3 is an enlarged view of the terminal end of the power cable of the present invention, and the same reference numerals as in FIGS. 1 and 2 indicate the same parts.

22 is a filler material that fills the voids that occur around the leaded end, and may be, for example, silicone grease or a commonly used insulating compound.

The terminal end of the electrical cable of the present invention is covered with an oil-resistant heat-shrinkable tube over the exposed belt insulation layer, and the oil-resistant heat-shrinkable tube and the leaded cut end are wrapped with a stress-controlling heat-shrinkable tube. Since it can be reversed, the exposed part of the Pel 1 insulation layer is reinforced with oil-resistant heat-shrinkable tubes, so it will not be damaged when opening the three insulated core wires in a fan shape, making the cable termination work easy and simple. It also reduces the stress between the cable core conductor and the leaded material, improving the performance and reliability of the cable.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a belt-insulated power cable, FIG. 2 is a cross-sectional view of the terminal end of the power cable of the present invention, and FIG. 3 is an enlarged view thereof. 1.2.3 is the conductor core wire, 1', 2', 3' are the insulation layers of the conductor core wire, 1//, 2/z, 3// are the insulation layers, 7 is the 3-phase insulated core, 8 is the Belt insulation layer, 9 is carbon paper, 10 is lead covering, 11 is oil-resistant heat shrink tube, 12 is stress control heat shrink tube, 22 is filler around the end of lead cover.

Claims (1)

[Scope of utility model registration request] The terminal end of an electrical cable, which is formed by covering the exposed belt insulating layer at the end of the cable with an oil-resistant heat-shrinkable tube, and covering the oil-resistant heat-shrinkable tube and the leaded cut end with a stress-controlling shrinkable tube. .