JPS6082014A - Terminal structure of rubber and plastic cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a terminal structure for a rubber or plastic cable.

[Conventional technology and problems]

The rubber and plastic cable terminal structure used for special high voltage applications (1GKV and above) uses an epoxy catch, a stress cone, and the same holding metal fittings (1'J pipe is installed and the illumination
Although it has a vertical structure, FIGS. 1A and 1B show an example of a simpler conventional terminal structure for relatively low pressure.
FIG. 1A shows a cable termination using a high conductivity sleeve as a stress control sleeve.

At the end of the rubber or plastic cable 1, the cable sheath 2, shielding copper tape 3, and outer conductive layer 4 are peeled off in a prescribed manner to expose the cable insulator 5.
Then connect the connecting terminal 7 to the end of the conductor 6 IL? :t, then the cable insulation 5 is covered with a layer of shielding 4 (layer of tape 3,
A heat-shrinkable high-permittivity sleeve 8 is pushed over the outer conductive layer 4 and heat-shrinked, and a heat-shrinkable protective sleeve 9 is inserted between a part of the connection terminal 7 and the outer circumference of the end of the cable sheath 2. The grounding wire io connected to the covering and shielding tape 3 is drawn out from between the protective sleeve 9 and the cable sheath 2.

By the way, the potential gradient distribution on the surface of the protective sleeve 9 in the above terminal structure is generally as shown in FIG. 1B.
It suddenly becomes high in the vicinity of the outer conductive layer 4, and this part becomes an electrical weak point.

That is, the high dielectric constant sleeve 8 covers the cable insulator 5 and the outer conductive layer 4, but because of the difference in outer diameter between the cable insulator 5 and the outer conductive layer 4, the high dielectric constant sleeve 8 covers the cable insulator 5 and the outer conductive layer 4. There is a void inside 8. Furthermore, fine gaps are often formed at the interface between the cable insulator 5 and the high dielectric constant sleeve 8.

When a gap as described in -1- is generated, the corona generation voltage becomes especially low and unstable, which deteriorates the electrical properties of the terminal portion. Conventionally, in order to prevent the occurrence of such voids, steps are generally taken to apply insulating grease to the step portion 11 or to form the step.

However, even if insulating grease is applied, it is difficult to completely eliminate the generation of voids in the length direction of the cable insulator 5 due to differences in shrinkage balance during heat shrinkage.

Further, the thickness of the outer conductive layer 4 is generally 1. Due to the nature of the work, it is difficult to carve it into a perfect taper shape using glass 11, etc., and when doing this work, it may damage the surface of the insulator 5, making it difficult to achieve a smooth finish. There is a problem in that workability is extremely poor because it takes an extra hour to do so. Although it is possible to use it for cables of 30KV class or higher, it is impossible to use it for cables of 30KV class or higher. Also, in Figures 2 and 3] I'J tube type 9
: Indicates the 1h-end structure. Figure 2 shows the lower part of the end of the tread A, and Figure 3 shows a part of the same. In FIG. 2, the cable sheath 2, shielding copper tape 3, and outer conductive layer 4 are stripped to specified dimensions at the end of the cable 1 to expose the cable insulator 5, similar to what was explained in FIG. 1A. let

As shown, the portion of the outer conductive layer 4 exposed to the cable insulation 5'' is attached to the semiconductive portion of the stress cone 12 11. :U.

In this state, the epoxy seat 14 integrated with the insulating tube seat plate 1G is covered and crimped on the outer surface of the stress cone I2, and the cable insulator 5 is made to protrude from its center, The plate 1G is fixed by an insulator tube fitting 20, a protective case 17 is fixed to the lower side of the insulator tube seat plate 16, and a stress cone I2 is fixed in the protective case 17 by a push fitting 13.
from the bottom to prevent a gap from forming, and pull out the grounding wire 10 from the shielding copper tape 3. Insulating tape 18,
Wrap 19 pieces of protective tape. Also, the insulator pipe I5 is engaged with the insulator pipe fitting 20, and the inside is filled with insulating oil 2I.
be done. On the other hand, the - part in FIG. 2 is as shown in FIG. 3, and the tip of the cable insulator 5 is stripped.
A connection terminal 7 is attached to the conductor 6. Note that 22 indicates an insulating layer made of self-melting Ef tape, 23 indicates a protective tape layer, 24 indicates a conductor support portion, and 25 indicates a rain cover. A terminal having such a ++4 construction can be used with cables of [i6 Kv class or higher], but the structure is extremely complex.

[Disclosure of the invention]

As explained above, in conventional relatively low voltage terminals, the terminal was assembled without using a stress cone, and in high-pressure terminals, a stress cone was used to assemble the terminal.
However, the present invention aims to provide a terminal that can be applied to high-rise buildings without using an I/less cone. '111 Rubber with 111 characteristics: Heat-shrink a heat-shrinkable stress control sleeve fitted externally across the inner layer, further join the interface between the cable insulator and the stress control sleeve, perform JI fusion, and assemble an insulator pipe on the outside. , plastic cable terminal 4
1 is in the structure.

[Embodiment] FIGS. 4 and 5 respectively show a lower part and an upper part of an example of the terminal structure of the present invention.

(It's inside the protective case 17 at the bottom of the tube 15, which will be described later.) i: Position the noodles and partially heat the outer periphery of the sheath 2 with a dryer to make it soft. At that point, slide the cable sheath 2 in the opposite direction from the end of the cable to create a protrusion 2G, and then layer the cable mace 2, shielding copper tape 3, and outer conductive layer 4 to a predetermined length! The cable insulator 5 is exposed, the exposed insulator 5 is cut at the end to expose the conductor 6, and the conductor connection terminal 7 is connected to the conductor 6 by a pressure 4. Next is Su! - Cover the outer conductive layer 4 with the Res control sleeve 27 from the middle of the insulator 5, pull out the ground wire 0, heat shrink it, and bring the inner periphery of the sleeve 27 tightly to the insulator 5 and the outer conductive layer 4. let By fusing the heat-shrinked stress coaters, they are integrated, eliminating voids at the interface. Stress control sleeve 2 for heating enemy method
A method is adopted in which a flexible heater or the like is attached to the outer periphery of the protective iLA 14, such as a glass tape, wound in the length direction of the 7, and heat-fused.

After the stress control sleeve 27 is heated and shrunk with a cover, the insulator pipe fitting 20 and the protective case I are
Assemble the 7th class.

Note that 30 is a high conductivity 1 which fills the space between the conductor 6 and the connection terminal 7.
h ratio admixture and is pre-deposited.

Connect the cable holding part 29 at the bottom of the protective case +7 to the source 2.
11. Below the protrusion 26 formed at 11.
The retainer 1+r portion 29 retains the cable 1H so as to be in contact with the protrusion 2G, and an insulating tape 18 and a protective tape 19 are wrapped over the joint portion.

ii' The J pipe fitting 20 is supported by another support, the two parts of the protective case 17 (11) are fixed to the J pipe fitting 20 in a 7-L shape, the insulator pipe 15 is engaged with the insulator pipe fitting 20,
Regarding the row 1 section, as shown in FIG.
30, the connection terminal 7 is held in the state of the 7-ru 30, and the rain cover 25 is attached. Insulation 2 inside the insulator pipe
Pile 21 is filled.

As explained above in the examples, the present invention is based on rubber.

Can be applied to plastic cable terminals.

〔effect〕

According to the present invention, there are the following effects.

(1) There is a risk that the end of the /- base may rub due to the heat cycle of the cable, but with a protrusion formed on the north side and this protrusion held by the cable holding part 29 of the protective case +7, By fixing to the metal fitting 20, the cable is stably held, and the cable terminal is assembled to this second part.

(2) Rubber and plastic cable terminals! (
After that, cover the exposed insulator and the outer conductive layer with a heat-shrinkable St+Nose control sleeve.
Heat shrink and further modify the interface between the sleeve and the insulator.
(Since the melting RF is used, the minute air contained inside the stress control sleeve is emitted, and there is no generation of minute voids at the interface between the stress control sleeve and the insulator, and the corona generation voltage is particularly high. This improves cable life and lengthens cable life.

(3) Since the stress control sleeve is heated and melted, as mentioned above, only a small amount is required at the interface, and there is no need to taper the end or finish the circle 717 by paper polishing, increasing the efficiency of terminal assembly work. can be improved.

(3) (By using the i'l tube in combination, it becomes possible to apply to a higher voltage edge than before.

As described in -1- above, according to the present invention, the high-pressure rubber, plastic, and cable terminals do not require a high level of skill to assemble, compared to conventional stress cone cable terminals, which improves workability. In addition, stress cones are not used, the number of parts is reduced, the insulator tube itself can be reduced, and a compact terminal configuration is possible.

[Brief explanation of the drawing]

Figure 1 A and B show rubber and plastic cable terminals +1' using Kuha shrinkable stress control sleeves.
An example of the construction and the potential gradient distribution are shown. Figure 2 shows the lower structure of a plastic cable terminal using a rubber stress cone, and Figure 3 shows two parts of the same. FIG. 4 shows the lower end of the rubber/plastic cable according to the present invention 61i 1u':! '-t
n-1511 f-+w l NR%1 L (whistle 1
1 l'7 'Fbin)h i:' Shows the upper structure of the terminal following i. ■... Rubber, plastic cable, 2... Cable north, 3... Shielding copper tape, 4... External conductive layer, 5... Cable insulator, 6... Conductor, 7... Connection terminal, 8... High dielectric constant sleeve, 9... Protective sleeve, 10
27. Heat-shrinkable stress control sheath, 28. Absolute H protection sleeve. Opening/closing (A) Figure 1 (B) [→

Claims (1)

[Claims] (1) At the end of a rubber or plastic cable, heat-shrink a heat-shrinkable 1+ stress control sleeve that has a protrusion formed on a part of the cable sheath and is fitted over the cable insulator and external conductive layer. A rubber characterized in that the interface between the full insulator and the stress control sleeve is heated and fused, an insulator tube is assembled on the outer periphery, the protrusion of the sheath is held by a protective case, and the case is fixed to the insulator tube. , terminal structure of plastic cable.