JP3190747B2 - Insulation stopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating plug for detecting electric power, which protects an electric detecting portion provided at a branch connection portion of a high-voltage distribution line.

[0002]

2. Description of the Related Art A high-voltage distribution line is branched through a branch connection or the like inside a handhole or the like provided underground.
This branch connection portion has a plug-in connection structure that is usually easily detachable. In addition, such a branch connection portion is provided with a power detection terminal for detecting whether or not a high voltage is applied when the connection portion is attached or detached or the like.

FIG. 3 is a longitudinal sectional view of a power detection terminal provided on a conventional device such as a branch connection portion and an insulating plug for protecting the terminal. (A) and (b) of the figure each show an insulating plug having a different configuration. In (a), the power detection unit 1 of the device includes:
The outer peripheral surface is covered with an insulating protective layer 2, and a conductor 3 for voltage detection is provided like a protrusion. On the other hand, the insulating plug 5 has a plug 6 at its center, and a contact louver 7 is fitted around the plug 6. Plug 6
The contact louver 7 is formed of an electric conductor, and is inserted into the connection hole 4 of the conductor 3 arranged in the power detection unit 1 of the device. Also,
An embedding fitting 8 is provided at the center of the insulating plug 5, and one end of the plug 6 is screwed and fixed therein. Mounting bracket 8
Is surrounded by the protective layer 10.

The protective layer 10 is composed of an inner semiconductive layer 11, an insulating layer 12, and an outer semiconductive layer 13 in order from the inside so as to surround the outside of the embedded metal fitting 8. Then, the insulating layer 12 swells so as to penetrate the side surface of the protective layer 10, and the power detection terminal 14 is embedded therein. One end of the power detection terminal 14 is exposed to the outside, and power is detected by connecting a measuring instrument. Note that the other end of the power detection terminal 14 is disposed so as to face the embedded metal fitting 8. In addition, a handle 15 is buried in the upper end of the protective layer 10, so that the operation of attaching and detaching the insulating plug 5 to and from the power detection unit 1 of the device is easy. When such an insulating plug 5 is attached to the voltage detecting unit 1, the conductor 3 in the voltage detecting unit 1 and the plug 6 of the insulating plug 5 are electrically connected, and the embedded metal 8 has the same potential as the conductor 3. Therefore, a constant voltage is induced in the power detection terminal 14 via the insulating layer 12.

[0005] (b) shows an insulating plug having another structure.
There is no insulation plug 9 corresponding to the plug 6 shown in FIG. That is, when the insulating plug 9 is attached to the power detection unit 1, the conductor 3 and the embedded metal member 8 come into direct electrical contact with each other,
Other operations are the same as those shown in FIG.

[0006]

However, the insulating plug having the structure shown in FIG. 1A has a complicated structure of the plug 6 and the contact louver 7 attached thereto, and the material cost is high. However, there is a problem that the whole becomes expensive. On the other hand, the insulating plug 9 shown in (b) omits the plug 6 and can be manufactured very inexpensively because its configuration is simplified. There is a possibility that the electrical contact with the metal fittings 8 may be incomplete, and there is a problem that a certain voltage cannot be reliably detected by the power detection terminal 14.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is intended to provide an insulating plug for power detection that is relatively inexpensive and can perform reliable power measurement by reliable electrical connection. It is intended to provide.

[0008]

SUMMARY OF THE INVENTION The present invention provides a frusto-conical shape.
It is covered with an insulating layer, and the end face is exposed at the tip side of the insulating layer.
Insulation plug fitted to the power detection section of equipment having a conducting conductor
And a protective insulating layer fitted to the insulating layer of the power detection unit;
A voltage detecting terminal having a voltage detecting terminal for voltage detection embedded in the protective insulating layer.
In the electrical insulation plug, facing the detection terminal of the protective insulation layer
Cylindrical embedding that is buried at the position and opens at the end face of the conductor
Metal fittings and can project into the embedded metal fittings toward the end face of the conductor
Contact with the contact arranged in the mounting bracket.
And press the contact so that it comes into contact with the end face of the conductor.
Elastic member and the tip of the insulating layer
Internal semiconductive layer having a protruding edge elastically fitted to the peripheral surface
And characterized in that:

[0009]

In this insulating plug, a contact urged so as to be pushed out by a spring or the like is incorporated in the embedded fitting. Fitting the insulating plug to electroscopic of the instrument result, the contacts on the end face of the conductor is pressed against elastically connects the buried metal conductor electrical manner. On the other hand, the protrusion of the inner semiconductive layer
The edge elastically fits into the peripheral surface of the tip of the insulation layer of the power detector,
Maintains a reliable fitting state to the electrical part. As a result, a predetermined induced voltage is generated in the power detection terminal arranged opposite to the embedded metal fitting, and the power detection measurement can be reliably performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of an insulating plug for voltage detection according to the present invention. The insulating plug 20 is attached to the power detection unit 1 of the device as in the related art. A conductor 3 is arranged at the center of the power detection unit 1 like a protrusion, and an end of the conductor 3 is exposed on the upper surface. On the other hand, an embedding fitting 23 is arranged at the center of the insulating plug 20, and this embedding fitting 23 has a container shape having an opening on the lower side. The contact 21 and the spring 22 are housed here. The contact 21 has its lower surface facing the conductor 3, and a spring 22 is arranged between the upper surface and the inner surface of the embedding fitting 23, and the contact 21 is elastically pressed against the conductor 3 by the force of the spring 22. Configuration.

Incidentally, the outer periphery of the embedded fitting 23 is surrounded by a protective layer 27. The protective layer 27 is made of
Are sequentially covered with an inner semiconductive layer 24, an insulating layer 25, and an outer semiconductive layer 26. Further, the insulating layer 25 protrudes sideways so as to penetrate the protective layer 27,
The power detection terminal 28 is embedded here. One end of the power detection terminal 28 is exposed to the outside, and the other end is arranged so as to face the embedding fitting 23. A stopper 29 is screwed into the edge of the lower end of the embedding metal fitting 23 so that the contact 21
Is prevented from jumping downward. The insulating plug having the above configuration is in a state as shown in FIG.

FIG. 2 is a longitudinal sectional view showing a state before mounting the insulating plug for detection of the present invention. As shown in FIG.
The contact 21 accommodated in the embedding fitting 23 is pushed downward by the force of the spring 22 and the stopper 29
Until it hits the lower end. When the insulating plug 20 is attached to the power detection unit 1 of the device in this state, the contact 21 abuts against the end face of the conductor 3 of the power detection unit 1 and receives an upward force. And, furthermore, the insulating plug 20
Is firmly fitted, the contact 21 is housed inside the embedding fitting 23 so as to compress and contract the spring 22. Then, a state as shown in FIG. 1 is obtained. In this state, the contact 21 is pressed against the end face of the conductor 3 with an appropriate pressure by the force of the spring 22, and the embedded fitting 23 and the conductor 3 are reliably electrically connected. Therefore, accurate power detection work is guaranteed by the power detection terminal 28.

The present invention is not limited to the above embodiment. In the above embodiment, a coil-shaped spring is used to elastically press the contact 21 against the end face of the conductor. However, a leaf-shaped spring may be used, or the contact itself may be formed into a leaf-spring. It may be configured.

[0014]

As described above, the insulating plug for voltage detection of the present invention described above
It has a contact that is elastically pressed against the conductor end face of the voltage detector, and the embedded metal fitting is securely connected to the conductor via this contact. A measurement can be made.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an insulating plug for voltage detection according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state before mounting the insulating plug of FIG. 1;

FIG. 3 shows an example of a conventional insulating plug for detection, and (a) and (b) are longitudinal sectional views of insulating plugs having different configurations.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electricity detection part 20 Insulation stopper 21 Contact 23 Embedded metal fittings 27 Protective layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 15/00 G01R 31/16 H01B 17/56 H01R 4/48 H02G 15/08

Claims (1)

(57) [Claims] 1. A power detection insulating plug which is covered with a frusto-conical insulating layer and which is fitted to a power detecting section of a device having a conductor whose end face is exposed at a tip side of the insulating layer. A power insulation insulating plug including a protective insulating layer fitted to the insulating layer of the power detection unit and a power detection terminal embedded in the protective insulating layer; A cylindrical embedding fitting buried at a position facing the terminal and opening on an end face side of the conductor; a contact arranged in the embedding fitting so as to be protrudable toward an end face of the conductor; An elastic member disposed in the metal fitting to press the contact so as to make the contact protrude and abut on the end face of the conductor; and a tip circumference of an insulating layer of the power detection unit, covering the embedded metal. And an inner semiconductive layer having a protruding edge elastically fitted to the surface.