JPH069340U - Cable termination connection - Google Patents

Abstract

(57) [Abstract] [Purpose] In the terminal connection part of rubber or plastic insulation cable such as CV cable, the internal insulation property is improved without changing the size of the current connection part, and the shock voltage is applied to the shielding layer insulation part. In this case, make sure that the outer surface of the insulating tube is flashed. [Structure] Tip curved portion 2 of semi-conductive stress cone portion 9
1, a rubber mold stress cone 10 having a structure in which an insulating rubber coating layer 22 is provided and only the base portion of the semiconductive stress cone portion 9 is exposed is fitted on the cable insulator 7. The end of the CV cable 4 is inserted into the epoxy sleeve 1 from below. And CV
Conductor connection terminal 15 fixed to the end of the conductor 5 of the cable 4
And the lower end of the conductor pull-out rod 2 are connected via a detachable contactor 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cable terminating portion, and more particularly, to a device direct connection type terminating connecting portion for rubber and plastic insulated cables.

[0002]

[Prior art]

 Conventionally, for rubber such as CV cable (cross-linked polyethylene insulation cable), as for the equipment direct connection terminal connection part (oil end box or gas end box) of plastic insulation cable, premold stress is applied to the end of the cable insulator. It is known that a cone or the like is inserted and then inserted into an insulating sleeve made of epoxy resin or the like. An example of the structure of such a terminal connection portion is shown in FIG.

[0003] In this figure, reference numeral 1 denotes an epoxy bushing, inside thereof is inserted conductor pull bar 2 is fixed to 1 the upper end of the epoxy bushing due conductor fixing bracket 3. The CV cable 4 is inserted from below into the epoxy sleeve 1, and the cable conductor 5 is connected to the lower end of the conductor pull-out rod 2 via a detachable contactor 6. Further, on the insulator 7 of such a CV cable 4, a mold cone stress is formed in which a stress cone portion 9 made of semi-conductive rubber is formed from one tapered surface of the spindle-shaped reinforcement 8 made of insulating rubber to the base. The cone 10 is inserted and fitted so that the outer peripheral surface is in close contact with the inner peripheral surface of the epoxy sleeve 1. Then, on the rear taper surface of the mold stress cone 10, a pressing pipe and a pressing / compressing device 11 including a shaft, a coil spring, a ring-shaped washer, etc. are attached. It is configured so as to be pressed and compressed in the axial direction of the cable. Furthermore, a metal adapter 12 is fixed to the lower end surface of the epoxy sleeve 1, and a tubular protective metal fitting 14 is fixed to the lower end of the adapter 12 via an insulating cylinder 13. In the figure, reference numeral 15 is a conductor connecting terminal, 16 is a stopper, 17 is a bottom plate of electric equipment, 18 is a winding layer of waterproof tape, and 19 is a tin-plated annealed copper wire for grounding the cable shielding layer 20. ing.

[0004]

[Problems to be solved by the device]

However, in the CV cable terminal connection portion having such a structure, the semiconductive stress cone portion 9 of the mold stress cone 10 is exposed on the rear taper surface, and thus the exposed semiconductive stress portion is exposed. The insulation (edge) distance (l ₂ ) between the tip of the cone portion 9 and the upper end of the metal adapter 12 is shorter than the length (l ₂ ) of the insulating cylinder 13 which is the insulation edge cutting distance of the shielding layer. Often becomes. Therefore, when an impact voltage is applied to the insulating portion of the shielding layer, flashover breakdown often occurs at the interface between the mold stress cone 10 and the epoxy sleeve 1, and this portion is invisible from the outside. Therefore, it was inconvenient for maintenance and inspection.

This problem can also be solved by increasing the above-mentioned insulation (edge surface) distance (l ₂ ), but this method inevitably changes the size of each part of the existing connection part. Therefore, it was not preferable in terms of compatibility with existing products and compact connection parts.

The present invention has been made to solve such a problem, and the internal insulation is improved without changing the dimensions of the current connection part, and an impact voltage is applied to the shield layer insulation part. In this case, it is an object of the present invention to provide a cable terminating connection portion with good insulation coordination so that the outer surface of the insulating cylinder is surely flashed.

[0007]

[Means for Solving the Problems]

 In the cable terminating connection of the present invention, a molded stress cone consisting of a spindle-shaped insulation reinforcement and a semi-conductive stress cone protruding in a cylindrical shape forward from one tapered surface is inserted on the cable insulation. At the cable terminating end where the fitted cable end is inserted into the insulation sleeve, the insulating member is coated on the semi-conducting stress cone of the mold stress cone and the semi-conducting stress cone is covered. It is characterized in that only the base of the sex stress cone is exposed.

[0008]

[Action]

 In the cable termination connection part of the present invention, the tip end curved part of the semi-conductive stress cone part in the mold stress cone is covered with the insulating member, and only the base part of the semi-conductive stress cone part is exposed on the rear tapered surface. It has a structured structure. Therefore, the insulating edge distance between the exposed part of the semi-conductive stress cone and the upper end of the metal member is the same as the length of the insulating member that covers the curved tip, compared to the conventional end connection part. It is stretched and is longer than the length of the insulating cylinder that cuts the insulating edge of the shielding layer. In this way, the insulation inside the connection is enhanced, so if an impact voltage is applied to the insulation of the shielding layer, flashover breakdown will occur reliably on the outer surface of the insulation cylinder, and mold stress There is no flashover inside the connection such as the interface between the cone and the insulation sleeve.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view showing a terminal box directly connected to a device of a CV cable, which is an embodiment of the present invention, and FIG. 2 is an enlarged view of a main part thereof. The portions above and below the portion shown in FIG. 1 are configured similarly to the conventional termination connecting portion shown in FIG. Further, in FIGS. 1 and 2, the same parts as those in FIG. 3 are designated by the same reference numerals to avoid duplication of description.

In the embodiment, a rubber mold stress cone 10 as shown below is fitted on the insulator 7 at the end of the CV cable 4, and an annular stopper 16 is fitted at the tip thereof. Has been done. That is, the mold stress cone 10 comprises a spindle-shaped reinforcing member 8 made of an insulating rubber such as ethylene-propylene rubber, and a semi-conductive member in which a cylindrical small-diameter portion is embedded in the base of the rear tapered surface thereof. And a stress cone portion 9 made of a conductive rubber. An insulating rubber coating layer that constitutes an insulating reinforcement is provided on the curved portion 21 at the tip of the semiconductive stress cone portion 9, and the rear taper is provided. Only the base of the semiconductive stress cone portion 9 is exposed on the surface. The end of the CV cable 4 into which the mold stress cone 10 is fitted is inserted into the epoxy sleeve 1 from below, and the conductor connection terminal 15 fixed to the end of the cable conductor 5 is provided. , Is connected to the lower end of the conductor pull-out rod 2 via a detachable contactor 6.

In the terminal box of the embodiment configured as described above, the mold stress cone 10 inserted into the insulator 7 at the end of the CV cable 4 is fitted to the tip curved portion 21 of the semiconductive stress cone portion 9. Is covered with the insulating rubber that constitutes the insulating reinforcement body 8, and only the base of the semiconductive stress cone portion 9 is exposed on the rear tapered surface. Therefore, the semiconductive stress cone portion 9 is exposed. The insulating edge surface distance (l ₂ ) between the tip and the upper end of the metal adapter 12 is longer than the length (l ₁ ) of the insulating cylinder 13 that cuts the insulating edge of the shielding layer 20. Therefore, when an impact voltage is applied to the insulating portion of the shielding layer, flashover breakdown occurs reliably on the outer surface of the insulating cylinder 13, and the inside of the connecting portion such as the interface between the mold stress cone 10 and the epoxy sleeve 1 is surely destroyed. There is no flashover and maintenance is easy. Further, it is sufficient to change the design of the mold for molding the mold stress cone 10 without changing the dimensions of the existing connecting portions, and there are few factors that increase the cost.

[0013]

[Effect of device]

 As is clear from the above description, in the cable terminating connection part of the present invention, the tip end curved part of the semi-conductive stress cone part of the mold stress cone is covered with the insulating member, and the insulating edge distance of this part is Since the insulation is extended and the insulation is enhanced, the insulation coordination is good, and when an impact voltage is applied to the insulating part of the shielding layer, the external surface of the insulating cylinder is surely flashed and an internal flash occurs. Absent.

Further, it suffices to change the molding die of the mold stress cone without changing the size of the existing connection portion, and the cost is hardly increased. In addition, a compact design of the connection is possible.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of a terminal box in oil of a CV cable which is an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing an enlarged main part of the embodiment.

FIG. 3 is a vertical cross-sectional view showing a structure of a device direct connection terminal connection portion of a conventional CV cable.

[Explanation of symbols]

 1 ………… Epoxy sheath 2 ………… Conductor lead-out rod 3 ………… Conductor fixing bracket 4 ………… CV cable 5 ………… Cable conductor 6 ………… Contactor 7 ………… Cable insulator 8 ………… Insulation reinforcement 9 ………… Semi-conductive stress cone portion 10 ………… Mold stress cone 11 ………… Pressing / compressing device 12 ………… Metal adapter 13 ………… Insulation cylinder 14 ………… Protective metal fittings 15 ………… Conductor connection terminal 16 ………… Stopper 17 ………… Equipment bottom plate 18 ………… Waterproof tape winding layer 19 ………… Tin-plated copper wire 20 ………… Cable shielding layer 21 ………… Curved tip 22 ……… Insulation Rubber coating layer

Claims (1)

[Scope of utility model registration request] 1. A cable end in which a mold stress cone composed of a spindle-shaped insulating reinforcement member and a semiconductive stress cone portion protruding cylindrically forward from one taper surface of the spindle-shaped insulating reinforcement member is inserted onto the cable insulator. A cable terminating connection portion formed by inserting the portion into an insulating sleeve, and covering an insulating member on the tip curved portion of the semiconductive stress cone portion of the mold stress cone, A cable terminating connection part characterized by exposing only the base part.