JPH02290120A - Connection section of cable - Google Patents

Abstract

PURPOSE:To make it possible enough to keep a creeping distance of an insulation section between an earth on the equipment side and a cable sheath and to facilitate manufacture by performing non-conductance of the earth on the cable sheath side and the earth on the equipment side. CONSTITUTION:A shielded electrode 9 encircling a conductor drawer bar 3 is buried inside the upper end of a cable connecting body consisting of an epoxy bushing 2, etc. Near the lower end a clamp 10 with a vertical flange 10a is buried. An inlet 2a and a straight section 2b are provided to the cable connecting body. Since the earth at a baseplate 1 of an equipment casing and the earth at a sheath 6a of a cable 6 are insulated by the bushing 2 itself, the insulation against surge discharge can be maintained even if the axial length of a cable end box is made larger because the insulating distance between the cable sheath and the equipment baseplate is secured by the distance between the fitting end of a cable protective fitting 5 and equipment baseplate 1 and by the thickness of bushing 2 present between the vertical flange of the clamp 10 and a stress cone 8.

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to improvements in cable connections. [Technical background of the invention and its problems] An example of a conventional CV cable termination box will be explained with reference to FIG. Figure 2 shows Cv used for 66Kv or more.
This is a cable termination box. This termination box consists of a mantle 2 made of Evokin attached to the bottom plate 1 of the equipment, a conductor pull-out rod 3 fixed to two ends of the second mantle 1, and a lower end of the mantle 2 connected via an insulating tube 4. The conductor 7 of the cable 6 is connected to the inner end of the conductor pull-out rod 3. The insulating tube 4 is for electrically insulating the ground on the cable sheath side connected to the cable protection metal 45 and the ground on the case of the equipment. In the figure, 8 indicates a stress cone, and 9 indicates a push pipe that presses the stress cone. Moreover, in order to obtain the above-mentioned insulation in the Hiiragi end box, the push vibrator is made of an insulating material. However, since a surge voltage of several Kv to several 1.Kv acts on the insulating portion, it is necessary to make the creepage distance as long as possible. However, if an insulating tube with a long shaft length is used to indicate a sufficient distance, the shaft length of the sleeve will become large, and if the push fitting is made of an insulating material, manufacturing will be troublesome and the cost will increase. There is a possibility that it will come. [Objective of the Invention] The present invention has been made based on the above-mentioned circumstances, and it is therefore possible to obtain a Cv cable connection part that can provide a sufficient distance between the equipment side ground and the insulation part between the cable sheath and is easy to manufacture. The purpose is to

Summary of W1 of the Invention The cable connection part of the present invention is such that a cable terminal having a stress cone inserted on the outer periphery of an insulator of the cable is attached to a cable connection body that hits a trumpet-shaped receiving port, and the stress cone is inserted into the receiving port. In the cable connection part that is inserted in a tight fit manner, the push metal fitting that presses the stress cone is made of metal, and a cable protection metal fitting is directly connected to the lower end of the cable connection body. It is said that Embodiment of the Invention FIG. 1, in which the same parts as in FIG. 2 are denoted by the same reference numerals, is a sectional view of a main part of an embodiment of the present invention. In this figure, inside the upper end of the cable connection body consisting of the epoxy sleeve 2, etc.
A shield electrode 9 surrounding the conductor pull-out rod 3 is buried. In addition, there is a vertical flange 10 on the inner circumference on the ring plate near the lower vent.
A mounting bracket 10 having a shape is embedded at its longitudinal flange 10a. Furthermore, a mounting bracket 11 is installed inside the epoxy sleeve 2 from the axial position of the do end of the shield electrode 9.
A trumpet-shaped receiving port 2a extending from the middle of the longitudinal flange 10a in the axial direction, and a straight portion 2b extending from the lower end of the receiving port to the lower end of the cannula are provided. In FIG. 1, reference numeral 11 indicates a pusher for pressing the stress cone 8 into the receiving opening 2a of the mantle 2. In the cable connection section having the above configuration, the insulation between the ground of the equipment case bottom plate 1 and the ground of the sheath 6a of the cable 6 is achieved by using the epoxy sleeve 2 instead of using an insulating tube as in the conventional cable n-end box. The distance between the cable protection fitting 5 and the equipment bottom plate 1, and the wall thickness of the sleeve 2 existing between the vertical flange of the mounting fitting 10 and the stress cone 8, determines the distance between the cable protection fitting 5 and the equipment bottom plate. Since the insulation I1 distance between the two cables is ensured, insulation against surge discharge can be maintained without increasing the axial length of the cable termination box. In addition, since there is no problem if all the parts such as push fittings inside the sleeve are at the same potential as the metal sheath, each part inside the sleeve can be made of metal. Furthermore, if we consider applying a pressing force to the stress horn, each part should be FR
It is more advantageous to use metal than insulating material such as P, and it is also possible to reduce the cost. [Effects of the Invention] As is clear from the above, the cable connection part of the present invention insulates the cable sheath side ground and the device side ground by the cable connection body itself, instead of using an insulating tube as in the conventional case. Therefore, insulation against surge discharge can be ensured without increasing the width of the cable connection body. In addition, since each part in the cable connection body can be made of metal, they can be manufactured with high precision by means such as Guicasting, and at a low cost.
(Can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a part of an embodiment of the present invention, and FIG. I12 is a sectional view showing an example of a conventional cable termination box. 1... Equipment bottom plate 2... Cable connection body 2a... Receiving port 2b... Straight portion 3... ......Conductor pull-out rod 4...Insulation tube 5...Cable protection fitting 6...
...Cable 7...Cable conductor 8...Stress cone 9...Shield metal 10...・Mounting bracket 11...Pushing bracket No./Fig.

Claims (1)

[Claims] In a cable connection portion, a cable terminal having a stress cone inserted around the outer periphery of an insulator of the cable is inserted into a cable connection body having a trumpet-shaped reception port, such that the stress cone is tightly fitted into the reception port. 2. A cable connection section, characterized in that a pusher for pressing the stress cone is made of metal, and a cable protection fitting is directly connected to a lower end of the cable connection body.