JPH0739185Y2 - Direct connection type power cable connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a so-called equipment direct connection type power cable connecting portion for directly connecting an electric power cable to electric equipment such as a transformer and a switch.

[Prior Art] For electrical connection between a conventional power cable and a transformer, switch, or other electric device, a terminating connection portion is formed on the power cable, and the exposed terminal and the terminal of the electric device are bare bond wires. It is common to connect with. In this connection method, since the high voltage part is exposed, it is necessary to maintain a sufficient insulation distance from surrounding objects including the ground, and not only the equipment area but also the height of the building when it is indoors. It is growing accordingly.

Due to the difficulty of securing a site for substation distribution equipment in recent years, in order to reduce the equipment area, building height, etc., the high-voltage part is exposed in the connection between the power cable and the electrical equipment both indoors and outdoors. It is performed to directly connect them without making them.

The second example of the conventional device direct connection type power cable connection part
Referring to the drawings, a socket connector 30 is attached to the terminal end of the power cable 10, and a case 22 of an electric device 20 connected to the power cable 10 is connected to a terminal 21 of the device. A body 40 is attached and connects them via a plug connection 50 without exposing the high voltage section.

That is, the terminal 12 is crimped to the lead-out conductor 11 of the power cable 10, and the socket connector including the elbow-shaped elastic insulator 31 such as a rubber elastic insulator and the connection pin 35 is provided to cover the terminals 12.
One side 32 of the cable 30 is closely fitted around the end of the cable, and the connection pin 35 is orthogonally connected (screw coupling) to the terminal 12 at the tip of the cable 10 in the fitting hole 34 of the one side 33. Can be set up.

In addition, an electric device 20 electrically connected to the power cable 10
In the case 22 of the socket connector 40, a fitting hole 42 of a flower pot-shaped insulator 41 (usually an epoxy resin coin insulator is used) of the socket connector 40 is attached so as to be exposed to the outside and a bottom portion 43 thereof. An embedded metal conductor bolt 44 is embedded and penetrated into the hole, and a threaded portion 45 is provided at the tip protruding into the fitting hole 42. The tip of the metal conductor bolt 44 protruded from the bottom portion 43 in the opposite direction. The terminal of equipment 20
21 is electrically connected.

Further, the plug connection body 50 for electrically connecting between the socket connection bodies 30 and 40 electrically connected to the power cable 10 and the electric device 20, respectively, is a socket connection attached to the power cable 10 at one end side. The inner periphery of the fitting hole 42 of the socket connector 40, which has an outer peripheral surface 52 that comes into contact with the inner peripheral surface of the fitting hole 34 of the body 30, and is attached to the electric device 20 on the other end side. Cylindrical elastic insulator 51 having an outer peripheral surface 53 that fits in contact with a surface, for example, a rubber elastic insulator, and a one-sided bottomed cylindrical shape having a bottom 55 on the other end side, which is closely adhered to the inner peripheral surface thereof. It is composed of a metal conductor 54.

One side of the plug connection body 50 is inserted and fitted into the fitting hole 34 of the socket connection body 30 attached to the end of the power cable 10, and at this time, the connection pin 35 is connected to the plug connection body. It is plugged into 50 cylindrical metal conductors 54 and is electrically connected by, for example, chip contacts in the drawing. The other side of the plug connector 50 has a fitting hole 42 of the socket connector 40 attached to the electric device 20.
It is inserted into the inside and fitted, and at this time, the socket connecting body 40
The threaded portion 45 of the tip of the implanted metal conductor bolt 44 is screwed and electrically connected to the bottom portion 55 of the bottomed cylindrical metal conductor 54 of the plug connector 50, thus electrically connecting the power cable 10 and the electric device 20. To be done.

[Problems to be solved by the invention] In the above, the outer peripheral surface of the plug connection body 50 on the electric device 20 side
53 is a tapered surface that is once tapered toward the end,
The fitting inner peripheral surface of the fitting hole 42 of the socket connector 40 fitted to this is a tapered inner peripheral surface corresponding to the tapered outer peripheral surface, and these are threaded portions at the tip of the metal conductor bolt 44.
By the screw connection between 45 and the bottom 55 of the cylindrical metal conductor 54, the elasticity of the elastic insulator 51 causes the elastic connector 51 to be tightly tightened to the flower pot-shaped insulator 41 of the socket connector 40, and the component in the lengthwise direction of this tightening. The elastic reaction of the metal conductor bolt 44
Although the screw connection between the cylindrical metal conductor 54 and the cylindrical metal conductor 54 is strongly maintained, the fitting of the flower pot-shaped insulator 41 and the cylindrical elastic insulator 51 is the fitting by the tapered surface. Therefore, the change in the interfacial pressure is large even with a slight movement in the length direction, stress relaxation is likely to occur in the elastic insulator 51 of the plug connector 50, and by extension, the load on the screw connection is reduced. In some cases, poor electrical connection may occur.

[Means for Solving the Problems] The equipment direct connection type power cable connection portion of the present invention is designed so that electrical connection between the socket connection body of an electric equipment and the socket connection body of an electric equipment can be achieved by a slight movement in the length direction of the plug connection body. A structure in which the connection is not greatly affected, and the inner peripheral surface of the fitting hole of the flower-pot-shaped insulator of the socket connection body of the electric equipment and the cylinder of the plug connection body fitted to this The outer peripheral surface of the elastic elastic insulator is a cylindrical peripheral surface having the same diameter in the length direction without taper, and the outer diameter of the elastic insulating material is slightly larger than the inner diameter of the fitting hole of the flower pot-shaped insulating material. And, when the socket connection body and the plug connection body are screwed together, the bottom portion of the flower pot-shaped insulator and the bottom portion of the one-sided bottomed cylindrical metal conductor of the plug connection body, with a washer between them. Elastic pressure It was made to be contacted.

[Operation] As described above, the inner peripheral surface of the fitting hole of the flower pot-like insulator of the socket connector on the electric device side and the outer peripheral surface of the cylindrical elastic insulator of the plug connector are not tapered in the longitudinal direction. Since the outer diameter of the cylindrical insulator is larger than the inner diameter of the flower pot insulator, the cylindrical insulator may move in the direction to come out with respect to the flower pot insulator. There is no change in the interfacial pressure between the two, and there is a washer to be elastically pressure-contacted between the bottom of the above-mentioned insulator and the bottom of the cylindrical metal conductor of the plug connector. Even if there is a movement in the longitudinal direction, the cylindrical metal conductor and the metal conductor bolt of the socket connector always act in a direction in which they separate from each other, and the contact load between the two screw threads does not change, and The contact resistance does not change.

[Embodiment] An embodiment of the structure of the device direct connection type power cable connection portion of the present invention will be described with reference to FIG. 20 is an electric device, 21 is its terminal, and 22 is its case, which is normally filled with insulating oil or gas. 30 is a power cable (not shown)
Socket connection body mounted on the one side, 33 is one side of the elbow-like elastic insulator, 34 is a fitting hole provided therein,
Reference numeral 35 is a connection pin that is connected to the conductor of the power cable and is erected in the fitting hole 34.

Reference numeral 60 denotes a socket connection body fixedly attached to the electric device 20, and has a cylindrical inner peripheral surface 62 having the same inner diameter in the length direction without taper.
A flower pot-shaped insulator 61 having a fitting hole 62 having a, for example, a hard insulator made of epoxy resin and its bottom portion 63.
And a plug-in metal conductor bolt 64 having a threaded portion 65 at the tip protruding into the fitting hole 62, which is penetrated into the electric wire. It is attached and fixed to the case 22 of 20,
The end of the metal conductor bolt 64 protruding from the side opposite to the threaded portion 65 is electrically connected to the terminal 21 of the electric device 20.

70 is a socket connector 30 attached to the power cable
And a socket connector 60 attached to the electric device 20, which is a plug connector fitted and electrically connected to the socket connector 60, which is a cylindrical elastic insulator 71 such as a rubber elastic insulator and its inner periphery. It is composed of a one-sided bottomed cylindrical metal conductor 74 having a bottom portion 75 on the electric device 20 side, which is in close contact with the surface. The insulator 71 is at least a socket connector of the electric device 20.
It has a cylindrical outer peripheral surface 73 of the same outer diameter in the length direction without taper on the side fitted to 60, the outer diameter of which is the cylindrical inner peripheral surface 62a of the flower pot-shaped insulator 61 of the socket connector 60. It is slightly larger than the inner diameter.

In this plug connector 70, the cylindrical elastic insulator 71 is replaced by the flower pot-shaped insulator 61 of the socket connector 60 on the electric device 20 side.
The threaded portion 65 at the tip of the implanted metal conductor bolt 64 is screwed to the cylindrical metal conductor 74 to be electrically connected to the electric device 20.

Further, the outer peripheral surface 72 of the cylindrical elastic insulator 71 of the plug connection body 70 on the power cable side is inside the fitting hole 34 on one side 33 of the elbow elastic insulation of the socket connection body 30 attached to the power cable. The contact pins 35 of the socket connector 30 are inserted into the cylindrical metal conductor 74 to be electrically connected. In the above-described embodiment, the outer peripheral surface 72 of the cylindrical insulator 71 of the plug connector 70 on the power cable side is a tapered surface, and the fitting hole 34 of the elbow-shaped insulator on the power cable side to be fitted into this is formed. The inner peripheral surface of is also shown to be a tapered surface corresponding to the above tapered surface, but this is the same in the length direction as the fitting of the plug connector 70 and the socket connector 60 of the electric device 20 side. There may be a fitting relationship between the inner peripheral surface of the cylinder having the inner diameter and the outer peripheral surface of the cylinder having the same outer diameter in the length direction slightly larger than the outer diameter thereof.

80, when the cylindrical metal conductor 74 of the plug connector 70 is screwed to the threaded portion 65 at the tip of the metal conductor bolt 64 which is implanted and penetrated in the bottom portion 63 of the flower pot-shaped insulator 61,
The bottom 75 of the metal conductor 74 and the flower-pot insulator 61
A washer which is provided so as to be elastically pressure-contacted with the bottom portion 63 of the spring, for example, a spring washer, a bellberry washer, or the like having its own elasticity. By tightening the bottom part 75 of the metal conductor 74, a force in the pulling direction always acts between them, and the metal conductor bolt 64 and the cylindrical metal conductor 74 are
A load is applied between the threads of and.

[Effect of the Invention] As described above, according to the device direct connection type power cable connecting portion of the present invention, the device is directly placed between the socket connecting body on the power cable side and the socket connecting body on the electric device side. The outer peripheral surface of the plug-connecting body that connects between the electric equipment side and the inner peripheral surface of the socket connecting body of the electric equipment side that is fitted and contacted with the same are cylindrical peripheral surfaces of the same diameter in the length direction without taper, and Since the outer diameter of the outer peripheral surface is larger than the inner diameter of the inner peripheral surface, even if there is a movement in the length direction between them, the compression force of the elastic fitting of the plug connector elastic fit Does not change and does not cause any inconvenience in mechanical connection between them, such as the conventional taper surface connection, and even in the screw connection between the embedded metal conductor bolt and the cylindrical metal conductor, the elastic pressure welding is performed between them. Wasshiya is sandwiched between them Since a force in the pulling direction is applied to, it is possible to always maintain a sufficient electric contact even when there is a movement in the length direction between the both connection bodies.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing an embodiment of the structure of the main part of the device direct connection type power cable connection part of the present invention, and FIG.
FIG. 1 is a partial cross-sectional side view showing an embodiment of the structure of a conventional equipment direct connection type power cable connecting portion. 10; power cable, 11; lead conductor, 12; terminal, 20; electric equipment, 21; terminal, 22; case, 30; socket connection body, 31; elbow elastic insulator, 32; one side, 33; one side Side, 34; fitting hole, 35; connection pin, 40; socket connection body, 41; flower pot-shaped insulator, 42; fitting hole, 43; bottom part, 44; embedded metal conductor bolt, 45; screw part, 50 ; Plug connector, 51; Cylindrical elastic insulator, 52; Power cable side outer peripheral surface, 53; Electric device side outer peripheral surface, 54; One sided bottomed cylindrical metal conductor, 55; Bottom part, 60; Socket connector, 61 ; Flower-pot insulator, 62; Fitting hole, 62
a; inner surface of cylinder, 63; bottom portion, 64; embedded metal conductor bolt,
65; screw part, 70; plug connector, 71; cylindrical elastic insulator, 7
2; power cable side outer peripheral surface, 73; electric device side outer peripheral surface, 74; one sided bottomed cylindrical metal conductor, 75; bottom portion, 80;

Claims (1)

[Scope of utility model registration request] (I) A flower pot-shaped insulator having a cylindrical inner peripheral surface having the same inner diameter in the length direction and having a fitting hole exposed and attached to a case of an electric device, and being implanted and penetrated at the bottom thereof. A socket connection having a threaded portion at a tip protruding from the bottom into the fitting hole, and an implanted metal conductor bolt electrically connected to a terminal of an electric device at a tip protruding at the opposite side. And (ii) a cylindrical elastic insulator having a cylindrical outer peripheral surface having the same outer diameter in the lengthwise direction on at least the side fitted to the socket connecting body, and the inner peripheral surface of the cylindrical elastic insulator being in close contact with the socket connecting body. It has a bottom part at the end on the side connected to the body, and the metal conductor bolt is screwed and electrically connected to the bottom part, and the connection pin electrically connected to the conductor of the power cable is inserted from the other end. Plugged in and electrically connected (Iii) When the plugged metal conductor bolt of the socket connector and the cylindrical metal conductor are electrically connected by screw coupling, A washer provided between the bottom portion and the bottom portion of the cylindrical metal conductor, and elastically pressure-contacted therethrough; and (iv) the inner diameter of the inner peripheral surface of the cylinder of the flower pot-shaped insulator A device direct connection type power cable connection part, wherein the outer diameter of the cylindrical outer peripheral surface of the elastic insulator on the side fitted to the socket connection body is slightly larger.