JP3192098B2 - Power cable connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power cable connection portion applied to a straight connection portion, a branch connection portion, a terminal connection portion, or the like of a power cable.

[0002]

2. Description of the Related Art At present, CV cables having a cross-linked polyethylene as an insulating layer are mainly used as high-voltage or ultra-high-voltage power cables used for power transmission. Prefabricated connection parts are widely used because of their features such as high quality, short on-site construction time, and high reliability.
In particular, recently, in order to meet the demand for miniaturization of the connection portion of the power cable, various types of reduced connection portions have been developed and used.

FIG. 9 shows an example of such a connecting portion.
This shows an example of the configuration of a prefabricated Y-branch connection portion for a 66 kV class CV cable. The outline of the connection box is as follows. A connection box is a conductor connector 10 formed with three conductor terminal mounting portions.
And an epoxy resin mold insulator 2 that insulates it.
0, and a metal case 30 for accommodating them and having good conductivity. Each CV cable 40 has a cable sheath, a shielding layer, and a distal end of an insulating layer which are sequentially peeled off to expose an exposed distal end of a cable conductor. It is inserted into the conductor terminal mounting portion 11 and is electrically connected to the conductor connector 10 via the wedge 12. A pre-molded insulator, a so-called stress cone 13, mounted on the cable insulating layer has a tapered surface near its tip inserted into a tapered hole of the molded insulator 20, and the back side is stressed through a push pipe 14 made of an insulating material. It is pressed by the cone compression device 15 to electrically insulate between the cable insulating layer and the mold insulator 20. The periphery of the cable insertion portion of the metal case 30 and the cable sheath are mechanically connected via the adapter 16 and the cable protection metal fitting 17.
In order to electrically cut off the sheath circuit between the cable sheath and the cable sheath, an insulating tube 18 is interposed between the adapter 16 and the cable protection bracket 17 to form a so-called edge cut portion. After connecting the CV cable in this manner, the metal case 3
The waterproof treatment is performed between the waterproof cover and the cable sheath by the waterproof treatment layer 19, respectively. Note that the example of FIG. 9 shows a state in which two CV cables are connected to the connection box, and an insulating plug 50 is attached to the remaining cable attachment portion instead of the cable.

[0004]

As described above, the conventional prefabricated Y-branch connection has the advantage that high-performance and stable quality can be maintained and that the on-site construction time can be shortened. Has also been achieved. However, demands for miniaturization and reliability of the connection portion of the power cable are increasing, and further miniaturization and high reliability are required. Considering the configuration of the above-described Y-branch connection from such a viewpoint, the wedge is used for the conductor connection, so that there is a limit in reducing the size of the cable connection. In other words, when screwing in the wedge tightening bracket and tightening the wedge, the stress cone must be largely retracted in order to insert the installation tool and secure the work space, and the stripping distance of the cable sheath etc. will also be longer. I have to do it. Moreover, in the method using wedges for conductor connection, there is a risk that cuts may occur when tightening the wedge by screwing in the wedge tightening bracket, but if this adheres to the interface of the insulator, insulation performance will be reduced and insulation breakdown will occur. There is a concern that In addition, it is necessary to use an insulating cylinder to form an edge cut portion in the sheath circuit, and the number of components increases due to the attachment thereof. SUMMARY OF THE INVENTION An object of the present invention is to provide a power cable connecting portion that can meet the above-mentioned demands, enables further miniaturization, and ensures high reliability.

[0005]

SUMMARY OF THE INVENTION A connecting portion of a power cable according to the present invention includes a conductor connector having one or a plurality of conductor terminal mounting portions, and an insulating cover for insulating the conductor connector to receive the power cable. A molded insulator having a sleeve, a metal case for protecting the molded insulator, a power cable in which a cable conductor is mounted on a conductor terminal mounting portion via a conductor terminal, and a power cable which is inserted into a tip of the insulator of the power cable. In the power cable connection portion having the stress cone and the stress cone compression device that presses the stress cone, the insulating sleeve of the molded insulator protrudes from the metal case to form an edge of the sheath circuit of the power cable. It is characterized by the following.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a power cable connecting portion according to the present invention, an insulating sleeve of a molded insulator has a square outer surface,
The inner surface can be circular. In the power cable connecting portion of the present invention, a cable protection fitting is attached to the insulating sleeve of the molded insulator via a push cover, and a waterproof sleeve is formed between the metal case and the push cover by dipping. It is desirable. The present invention can be applied to the Y-branch and other branch connection portions. In this case, the outer surface of the insulating sleeve of the molded insulator has a square shape and the inner surface has a circular shape. Are desirably arranged side by side. In the power cable connecting portion of the present invention, when the outer surface of the insulating sleeve of the molded insulator is square and the inner surface is circular, the push lid attached to the insulating sleeve has an outer circular shape, and the waterproof sleeve and the waterproof layer of the cable protection bracket are connected to each other. It is desirable to dispose a waterproof treatment layer for connecting the push cover on the outer surface of the lid.

In the power cable connecting portion of the present invention,
A stress cone compression device having a preset function can be arranged between the stress cone and the push lid. This stress cone compression device can be composed of a stress cone pusher, a spring pressing the stress cone pusher, and a wire ring engaged with a preset surface of the stress cone pusher. Further, in the power cable connecting portion of the present invention, it is desirable that the conductor terminal is constituted by an inner plug, an outer plug, and a cable pull-out prevention mechanism. Specifically, a conductor terminal attached to the conductor terminal attachment portion of the conductor connector is connected to the inner plug fixed to the end of the cable conductor, and is inserted into the inner plug, thereby providing electrical connection between the conductor connector and the inner plug. An outer plug, a press fitting movably arranged in the axial direction of the outer plug below the inner side of the outer plug, and an outer plug and a conductor which are pressed by the press fitting and protrude into the positioning groove of the conductor connector. A protrusion that locks between the connector and a coil spring that connects between the outer plug and the pressing metal fitting is provided.The pressing metal fitting places the stress cone inserted at the distal end of the insulator of the power cable at a predetermined position. A pressure receiving portion that receives the pressing force at the time of insertion, and when the pressing metal member moves in the axial direction of the outer plug due to the pressing force received by the pressure receiving portion, causes the protrusion to protrude into the positioning groove of the conductor connector. Pressing part It can be configured. The projecting body may be a projecting ball, and the positioning groove of the conductor connector may be a conical hole. Further, it is desirable that the protrusions and the positioning grooves are uniformly arranged at four circumferential positions on the inner surface of the conductor connector.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same parts as those in FIG. 9 are denoted by the same reference numerals and described. Further, in this embodiment, since the configuration of the three power cables branched and connected and the connection mechanism thereof is the same, only one of the power cables will be described with reference numerals. FIG. 1 shows the present invention using a 66 kV class C
This shows an example applied to the Y-branch connection of a V cable.
The conductor connector 10 made of a highly conductive metal material, such as copper or aluminum, has one conductor opening at the center of the lower surface (the upper and lower sides indicate the state in FIG. 1 and does not mean the state during use; the same applies hereinafter). It has a conductor terminal mounting portion 11 and two conductor terminal mounting portions 11 (one conductor terminal mounting portion is not shown) opened on the upper surface on both sides thereof. The conductor connector 10 is insulated and covered by a mold insulator 20 made of an insulating material such as an epoxy resin. The mold insulator 20 includes three insulating sleeves 21 extending coaxially with the conductor terminal mounting portions 11. Are formed to protrude. This mold insulator 20 is covered with a highly conductive metal case 30 except for the insulating sleeve 21.
Is protected. The metal case 30 is divided into two pieces 30a and 30b in the length direction, and these are connected and integrated by a bolt 31. A conductive paint such as silver paint is applied to the surface of the mold insulator 20 located in the metal case 30, and the roots of the insulating sleeves 21 and the metal case 3 from which they protrude.
Rubber packings 22 are interposed between the openings 0, respectively. Each insulating sleeve 21 has a quadrangular outer surface and a cylindrical inner surface, and a push lid 60 is attached to each of the distal ends thereof.

A waterproof layer 32 is formed between the outer surface of the metal case 30 and the outer surface of the push lid 60 therefrom. The waterproof layer 32 is formed by dipping a vinyl chloride resin or the like. At the time of this dipping, before assembling the pieces of the metal case 30, the tip of each of the pieces is fitted with the diameter of the push lid 60. A cylindrical core having an equal outer diameter and an appropriate length is attached, and after continuously forming a dipping layer on those outer surfaces, by removing the core, not only the outer surface of the metal case 30 but also
A waterproof layer 32 having a shape from which three waterproof sleeves 32a protrude can be formed. The metal case 3
The waterproof layers 32 on the side of the pieces 30a and 30b are vinyl-welded after the metal case 30 is assembled. 32b shows this welding line. Further, holes formed in the waterproof layer 32 on the side of the piece 30a for mounting the bolt 31 are also closed by vinyl welding. Cable conductors 41 are attached to the conductor terminal attachment portions 11 of the conductor connector 10 via conductor terminals 70 described later. The stress cone 13 attached to the cable insulating layer 42 has a tapered surface near the tip end formed by a tapered hole 23 of the mold insulator 20.
And the back side is pressed by the spring 15b via the stress cone pressing tool 15a of the stress cone compression device, thereby electrically connecting the cable insulating layer 42 and the mold insulator 20 electrically. The push cover 60 and the cable sheath 43 are connected by the cable protection fitting 17. A waterproof tape or the like is wound between each waterproof sleeve 32a and the waterproof layer 33 on the cable protection fitting 17, and between the waterproof layer 33 and the cable sheath 43, respectively, to form waterproof processing layers 19a and 19b. are doing.

FIG. 2 shows a frame A portion of FIG. 1 in an enlarged manner. As shown in this figure, the push lid 60 is a cylindrical part 60a.
And a flange portion 60b protruding inward from one end thereof, in which a stress cone compression device having a preset function is arranged. This compression device includes a stress cone pusher 15a, a spring 15b pressing the stress cone pusher 15a, and a wire ring 15d engaging with a preset surface 15c of the stress cone pusher 15a. More specifically, the lower end of the spring 15b that presses the stress cone pusher 15a is pressed against the flange portion 60b, and the stress cone pusher 1a is pressed.
The vicinity of the lower end of 5a has a slightly large diameter, and a tapered preset surface 15c whose diameter decreases upward is formed on the upper surface. An annular groove is cut in the inner peripheral surface near the upper end of the cylindrical portion 60a of the push lid, and a preset wire ring 15d is inserted therein.

Before the push lid 60 is attached to the insulating sleeve 21, the stress cone pusher 15a and the spring 1
5b is preset. That is, the spring 15b is arranged in the push lid 60, and the stress cone pusher 15a is placed on the spring 15b and pressed.
The stress cone pusher 15a is pushed into the push lid 60 against the repulsive force b. In this state, the cylindrical portion 60a of the push lid
The wire ring 15d is inserted into an annular groove cut on the inner peripheral surface near the upper end of the wire. If the pressing force is removed here, the stress cone pusher 15a tends to rise due to the repulsive force of the spring 15b.
It stops when it comes into contact with 5d, and is thus preset. In this case, the preset surface 15c is a tapered surface, and the rising force by the spring 15b gives a component force to push the wire ring 15d into the annular groove of the push lid, so that the preset surface 15c is in contact with the preset surface. Then, even if the wire ring 15d has a small diameter, the stress cone pusher 15a is firmly preset.

Thus, the stress cone pusher 15
The push cover 60 preset with a and the spring 15b is inserted into the cable insulating layer, and is attached to the insulating sleeve 21 with a mounting bolt. At this time, when the mounting bolt is screwed in, the stress cone pusher 15a
, While the spring 15b is gradually compressed,
Since the preset surface 15c and the wire ring 15d are separated from each other, the stress cone 13 presses against the tapered hole 23 with a predetermined force due to the repulsive force of the spring 15b, and maintains the dielectric strength.

By the way, the cylindrical portion 60a of the push lid 60 is cylindrical as shown in FIG. 3, and the outer surface of the insulating sleeve 21 to which it is attached is a square whose maximum diameter is equal to the outer diameter of the cylindrical portion 60a. . This insulating sleeve 21 is made as thin as possible within the necessary range in terms of the dielectric strength and mechanical strength, in order to reduce the amount of material used and the space occupied, and to secure bolt holes for mounting bolts of the push lid 60. The four corners are bulged to form a square tube.
Therefore, bolt holes are formed at the four corners of the insulating sleeve 21, and counterbore holes are provided at positions corresponding to the bolt holes in the cylindrical portion 60 a of the push lid, and both are formed by the mounting bolts 61 inserted therebetween. Are linked. 6
Reference numeral 2 denotes a mounting bolt for connecting between the push cover 60 and the cable protection fitting 17, and reference numeral 63 denotes a mounting bolt for connecting the wire shield 44 of the cable to the push cover 60.

FIG. 4 is a sectional view taken along the line IV-IV of FIG. However, the waterproof layers 32a and 33 and the waterproof processing layer 19a are not shown. As is apparent from this figure, the metal case 30 is a flat quadrilateral, and the two insulating sleeves 21 are arranged side by side so that their adjacent surfaces are parallel. It is possible to shorten the width L ₂ of the distance L ₁ and the metal casing 30 of the branch cable end 40 by such an arrangement. Next, the conductor terminal 7
A specific configuration example of 0 will be described. FIG. 5 exemplifies a conductor terminal 70 provided with a cable pull-out prevention mechanism. An inner plug 71 is compression-connected to the tip of the cable conductor 41. The inner plug has a female screw 7 at the center of the upper end face.
The cable conductor 41 is provided with a through-hole formed with a wedge 72 through the through-hole. An annular slit 71b is formed in the middle of the cylindrical portion of the inner plug 71 so that when the lower half of the cylindrical portion is compressed, the deformation does not reach the upper half of the cylindrical portion. An annular groove having a small depth is cut in the outer surface of the upper half portion of the cylindrical portion, and the contact 73 is fitted therein.

An outer plug 74 is mounted outside the inner plug 71. The outer plug 74 includes a disk portion 74a having a projection formed with a male screw on the center lower surface, a cylindrical portion upper half portion 74b, and a cylindrical portion lower half portion 74c. By screwing into the female screw 71a, the inward flange 74 of the cylindrical portion upper half 74b is formed.
d is sandwiched between the lower surface of the disk portion 74 a and the step on the upper surface of the inner plug 71, and is fixed to the inner plug 71. At this time, the inner plug 71 and the outer plug 74 are electrically connected via the contact 73. As shown in FIG. 6, the outer plug 74 includes a thick, small-diameter cylindrical upper half 74b and a thin, slightly larger-diameter cylindrical lower half 74c, and the outer surface of the cylindrical upper half 74b. The annular groove 7 for fitting the contact 75
4e is cut off. Further, a cylindrical groove 74f for inserting a spring 76 is formed in the lower end surface of the cylindrical portion upper half 74b. The lower half 74c of the cylindrical portion has its circumferential direction 4
74 g of ball storage holes are formed at several places. These ball storage holes 74g are tapered holes whose diameter decreases from the inner surface to the outer surface of the lower half portion 74c of the cylindrical portion, and the outer surface has a slightly smaller diameter than the diameter of the protruding ball 77. . In the vicinity of the lower end of the inner surface of the cylindrical lower half 74c, an annular groove 74h for fitting the wire ring 78 is cut.

FIG. 7 shows the structure of the pressing fitting 79 disposed below the inside of the outer plug 74. This press fitting 7
Reference numeral 9 denotes a cylindrical body having a basic shape, and four pressing portions 79a projecting from the outer peripheral surface near the upper end thereof at equal intervals. A cylindrical groove 79b into which a spring 76 is inserted is formed on the upper end surface of the press fitting 79. A fastening ring 79 forming a pressure receiving portion is provided on the outer peripheral surface near the lower end of the press fitting 79.
c is projected. The retaining ring 79c is a C-shaped ring, which is a stainless ring with a cut in the middle, and its inner peripheral surface is fitted into an annular groove formed on the outer peripheral surface near the lower end of the press fitting 79. I have. As shown in FIG. 5, the press fitting 79 is disposed inside the lower half portion 74c of the cylindrical portion of the outer plug 74, and the coil spring 7
The outer plug 74 is attached to the lower end surface inside the upper half portion 74b of the cylindrical portion by inserting and connecting the connecting member made of 6 between the groove 74f and the groove 79b. When attaching the press fitting 79, the projecting balls 77 are respectively inserted into the ball storage holes 74g of the outer plug 74, and then the pressing portions 79a are positioned so as to be at the same circumferential position inside the ball storage holes 74g. do. In addition, the press fitting 79
The wire ring 78 is fitted into the groove 74h of the outer plug 74 in order to prevent the detachment.

As shown in FIG. 5, the inner surface of the conductor terminal mounting portion 11 of the conductor connector 10 has an appropriate shape and dimensions for receiving the outer plug 74. In addition, four positioning grooves 11a are equal at four locations on the inner surface of the conductor terminal mounting portion 11 so as to be located outside the ball storage hole 74g when the outer plug 74 is inserted into a predetermined position. They are arranged at intervals. These positioning grooves 11 a are formed of conical holes sized to receive a part of the protruding ball 77. Cable conductor 4 as described above
The outer plug 74 fixed to the first plug 1 and having the pull-out prevention mechanism attached thereto is provided with a groove 74e formed on the outer surface of the cylindrical upper half 74b.
After the contact 75 is fitted into the conductor connector 10 through the insulating sleeve 21 together with the tip of the CV cable 40.
Is inserted into the conductor terminal mounting portion 11. The contact 7
As 5, a contact called a multi-ram band in which a number of ribbon-shaped leaf spring assemblies are arranged on the circumference is used. At the time of insertion, before the stress cone 13 is completely pushed into the prescribed position, as shown in FIG.
3a is retracted and does not press the pressing metal 79, so that the pressing metal 79 receives the force of the spring 76 and retreats to a position defined by the wire ring 78. As a result, part of the protruding ball 77 is located in the ball storage hole 74g, and the remaining part is supported by the inclined surface of the upper surface of the pressing portion 79a.
4b is retracted so as to be located between the lower end of 4b and the press fitting 79. Therefore, the outer plug 74 is connected to the conductor connector 1.
0 can be smoothly inserted into the conductor terminal mounting portion 11.

Next, the stress cone 13 is moved by the spring 15b and the stress cone pusher 15a shown in FIG.
Is pressed to move forward, the stopper 13a located at the tip thereof also moves forward and comes into contact with the pressure receiving portion 79c to press the pressure fitting 7
Push up 9. At this time, the protruding ball 77 supported on the inclined surface of the pressing portion 79a is pressed by the inclined surface, and a part of the protruding ball 77 projects into the positioning groove 11a. As shown in FIG. 5, when the outer end of the pressing portion 79a comes into contact with the surface located inside the protruding ball 77, nearly half of the protruding ball 77 is located in the positioning groove 11a. In this state, the projecting ball 77 is prevented from moving inward by the pressing portion 79a, so that the conductor connector 10 and the outer plug 74 are locked, and as a result, the cable is prevented from falling off.

When the CV cable 40 is pulled out from the inside of the mold insulator 20, the protection bracket 17 shown in FIG.
And the stress cone 13 is also retracted. By doing so, the stopper 13a also retracts, and the pressing fitting 79
Is lowered by the force of the spring 76, so that the projecting ball 77 returns to the state shown in FIG. Thus, the lock is released and the cable can be pulled out of the mold insulator 20. Further, as the contacts 73 and 75, a contact called a multi-lam band in which a large number of ribbon-shaped leaf spring assemblies are arranged on the circumference is used. As mentioned above,
In the power cable connecting portion of the present invention, the insulating sleeve of the molded insulator is protruded from the metal case to form the edge cut portion of the sheath circuit of the power cable. Since there is no need to provide a mechanism for attachment, the number of components can be reduced, and the dimensions of the connection portion can be reduced.

In the present invention, when the outer surface of the insulating sleeve of the molded insulator is square and the inner surface is circular, the dimensions of the outer surface of the insulating sleeve can be reduced, and the size of the entire connecting portion can be reduced. . If a cable protection bracket is attached to the insulation sleeve of the molded insulator via a push cover, and a waterproof sleeve is formed by dipping between the metal case and the push cover, the formation of the waterproof treatment layer by tape winding etc. The number of steps can be reduced, and the risk of water leakage can be reduced.
When the present invention is applied to a branch connection portion, if the insulating sleeve of the molded insulator is square on the outer surface and circular on the inner surface, and a plurality of these insulating sleeves are arranged side by side so that their adjacent surfaces are parallel to each other, the connection portion The overall size can be reduced. In the present invention, when the insulating sleeve of the molded insulator has a square outer surface and a circular inner surface, the push lid attached to the insulating sleeve has an outer circular shape, and connects the waterproof sleeve and the waterproof layer of the cable protective fitting. It is desirable to arrange a waterproofing layer on the outer surface of the lid. In this way, since the waterproofing layer formed by the tape is applied to the circular surface, stress is concentrated on the corners, as in the case of winding on a square surface, and slack occurs at the middle of the corners. Such inconvenience can be avoided.

In the present invention, if a stress cone compression device having a preset function is arranged between the stress cone and the push lid, the compression distance at the time of the on-site assembly work can be shortened by the preset amount, so that the mounting bolt is used. The screwing distance of the screw 71 can be reduced, and the working time can be reduced. In particular, when the conductor terminal uses an inner plug, an outer plug, and a cable pull-out prevention mechanism in which a lock mechanism is activated by pressing the stress cone, the movement of the stress cone is small, which is advantageous. When using a conductor terminal with an inner plug and an outer plug,
As in the case of wedges, there are no cut pieces,
Since the moving distance of the stress cone can be shortened, the stripping length of the cable sheath can be reduced, and the dimensions of the entire connecting portion can be reduced.

[0022] Incidentally, for example, when the Y-branch connection of CV cable 66kV class, according to the present invention 220mm distance L ₁ between the cable in FIG. 4, the width L of the junction box
₂ can be about 400 mm. In the case of the conventional example shown in FIG. 9, L ₁ is about 370 mm and L ₂ is about 620 mm.
In the case of the present invention, the length of the connection box (L _{3 in} FIG. 1) is about 680 mm, but in the case of the conventional example, it is 1,160 mm. Can be significantly reduced. In the above-described embodiment, an example in which the present invention is applied to the Y-branch connection portion of the power cable has been described. However, the present invention is not limited to this, and may be a straight-line connection portion, a terminal connection portion, or a device directly connected. It can be widely applied to shaped connection parts. In addition, before attaching the cable protection bracket, the end of the stress cone pusher can be visually observed from the gap between the flange of the push lid and the cable, so that it can be easily confirmed whether the stress cone is properly mounted. .

[0023]

As described above, according to the present invention,
It is possible to obtain a power cable connection portion that can be further downsized and that can ensure high reliability.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal plan view showing an embodiment of a power cable connecting portion of the present invention.

FIG. 2 is an enlarged vertical sectional view of a frame A portion in FIG.

FIG. 3 shows the push lid 60 and the insulating sleeve 21 in FIG.
FIG.

4 is a view taken in the direction of arrows IV-IV in FIG. 1 (a waterproof layer and a waterproof treatment layer are not shown).

FIG. 5 is a longitudinal sectional view illustrating a specific configuration of a conductor terminal 70 in FIG. 1;

FIG. 6 is a longitudinal sectional view showing an outer plug used in the embodiment of FIG.

FIG. 7 is a longitudinal sectional view showing a pressing fitting used in the embodiment of FIG. 5;

FIG. 8 is a longitudinal sectional view for explaining a procedure of assembling the connecting portion of the present invention.

FIG. 9 is a longitudinal sectional view illustrating a branch connection portion of a conventional power cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Conductor connector 13 ... Stress cone 15 ... Stress cone compression device 15a ... Stress cone presser 15b ... Spring 16 ... Adapter 17 ... Cable protection bracket 18 ... Insulation cylinder 19, 19a, 19b ... Waterproof Processing layer 20 Mold insulator 21 Insulating sleeve 30 Metal case 32, 33 Waterproof layer 32 Waterproof sleeve 40 CV cable 60 Push lid 70 Conductor terminal 71 Inner plug 74 …… Outer plug 77 …… Protruding ball 79 …… Pressing fitting

Claims (10)

(57) [Claims] 1. A conductor connector having one or a plurality of conductor terminal mounting portions, a mold insulator having an insulation sleeve for insulating and covering the conductor connector and receiving a power cable, and protecting the mold insulator. A metal case, a power cable having a cable conductor mounted on the conductor terminal mounting portion via a conductor terminal, a stress cone inserted at an end of an insulator of the power cable, and a stress cone for pressing the stress cone. A power cable connection part comprising a compression device, wherein the insulating sleeve of the molded insulator protrudes from the metal case and forms a cutout of a sheath circuit of the power cable. 2. The power cable connecting part according to claim 1, wherein the insulating sleeve of the molded insulator has a square outer surface and a circular inner surface. 3. A cable protection fitting is attached to an insulating sleeve of a mold insulator via a push lid, and a waterproof sleeve is formed between the metal case and the push lid by dipping. 1 or 2
The power cable connection described in the above. 4. The power cable connection portion is a branch connection portion, and the insulating sleeve of the molded insulator has a square outer surface and a circular inner surface, and a plurality of these insulating sleeves are arranged so that their adjacent surfaces are parallel to each other. The power cable connection according to any one of claims 1 to 3, wherein the power cable connection is arranged. 5. The insulating sleeve of the molded insulator has a square outer surface and a circular inner surface, and a push lid attached to the insulating sleeve has a circular outer surface, and connects the waterproof sleeve to the waterproof layer of the cable protective fitting. The power cable connection part according to any one of claims 1 to 4, wherein a waterproof layer wound with a tape is provided on an outer surface of the push lid. 6. The power cable connecting part according to claim 1, wherein a stress cone compression device having a preset function is arranged between the stress cone and the push lid. . 7. A stress cone compression device having a preset function, comprising: a stress cone pusher, a spring pressing the stress cone pusher, and a wire ring engaged with a preset surface of the stress cone pusher. The power cable connection according to claim 6, characterized in that: 8. An inner plug having a conductor terminal attached to a conductor terminal attachment portion of a conductor connector fixed to a cable conductor tip,
An outer plug which is inserted into the inner plug and conducts between the conductor connector and the inner plug; a pressing metal member movably arranged in the axial direction of the outer plug below the inner side of the outer plug; A projecting body pressed by a pressing fitting, projecting into the positioning groove of the conductor connector and locking between the outer plug and the conductor connector, and a coil spring connecting the outer plug and the pressing fitting. A pressure receiving portion for receiving the pressing force when the stress cone fitted to the distal end of the insulator of the power cable is inserted into a prescribed position; and the pressing metal member by the pressing force received by the pressure receiving portion. And a pressing portion for protruding the protruding body into the positioning groove of the conductor connector when the protruding member moves in the axial direction of the outer plug. The power cable described Bull connection. 9. The power cable connecting part according to claim 8, wherein the protruding body comprises a protruding ball, and the positioning groove of the conductor connector comprises a conical hole. 10. The power cable connecting part according to claim 8, wherein the protrusions and the positioning grooves are evenly arranged at four circumferential positions on the inner surface of the conductor connector. .