JP2001266720A - Vacuum breaker on pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum switch on pole, that is intended for solving eccentricity of a movable conductor and achieving reduction in casing size. SOLUTION: In a structure, where a vacuum valve 12 housing a movable contactor and a fixed contactor in a vacuum container is arranged, and a movable conductor 12b is connected with a terminal conductor 14b, a coupling cylinder 3 incorporating a sliding electrode 2 is installed in the movable conductor 12b which extends to the outside from the movable contactor in the vacuum valve 12. Into this coupling cylinder 3, a top end part 14c of the terminal conductor 14b is inserted through the sliding electrode 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a pole vacuum switch installed on a power pole of a distribution line system.

[0002]

2. Description of the Related Art Conventionally, a pair of insulators 1 provided on both sides of a casing 11 as shown in FIG.
A vacuum valve 12 in which a movable contact (not shown) at the tip of the movable conductor 12b and a fixed contact (not shown) at the tip of the fixed conductor 12a are accommodated in a vacuum vessel is provided between 3a and 13b. The fixed conductor 12a is connected and fixed to a terminal conductor 14a penetrating one insulator 13a,
b is connected to a terminal conductor 14b penetrating the other insulator 13b.

In this case, the rear end of the movable conductor 12b is connected to an operation lever 15a of the main shaft 15 by a pin 12c. By moving the operation lever 15a of the main shaft 15 back and forth, the movable conductor 12b is moved forward and backward, and a vacuum is applied. The contact in the valve 12 is configured to be opened and closed. The movable conductor 12b and the terminal conductor 14b are connected by a flexible lead wire 16 so as to be separated and approachable.

[0004] In the case of such a pole-mounted vacuum switch, there are the following problems, and there has been a demand for its solution. (1) Since the flexible lead wire 16 is formed to be flexible, it tends to generate vibration due to its own or other phase electromagnetic force when energized, and because it is curved, it is subjected to an eccentric load due to electromagnetic force. The structure is apt to cause misalignment with respect to the center axis of the vacuum valve 12 due to generation of stress. Such misalignment occurs in the vacuum valve 12
This may cause the contact to be displaced, thereby deteriorating the current-carrying characteristics and withstand voltage characteristics, or applying an unbalanced load to a bellows (not shown) supporting the movable conductor 12b.

[0005] (2) The flexible lead wire 16 needs to be provided with sufficient room for advance and retreat of the movable conductor, so that it is bent outward. On the other hand, the casing forming the outer shell needs to be sufficiently isolated from the overhanging flexible lead wire, so that it is inevitable to increase the size accordingly.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to eliminate the above-mentioned misalignment of the movable conductor and to downsize the casing. A vacuum switch on a pillar is provided.

[0007]

SUMMARY OF THE INVENTION The above problem is solved by providing a connecting cylinder having a sliding electrode built in a movable conductor extending from a movable contact in a vacuum valve to the outside, and attaching an insulator to the connecting cylinder. The on-column vacuum opening / closing method according to the present invention, characterized in that the terminal conductor provided therethrough is slidably fitted and the movable conductor side and the terminal conductor are conducted through the sliding electrode. Can be solved by a vessel. The present invention can be preferably embodied as a pole-mounted vacuum switch in a form in which the sliding electrode housed in the inner surface of the connection cylinder is slidably in contact with the outer peripheral surface of the terminal conductor. it can.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the on-column vacuum switch of the present invention will be described with reference to FIGS. Also in the on-column vacuum switch of the present invention, a pair of insulators 1 provided on both sides of a casing 11 as illustrated in FIG.
A vacuum valve 12 in which a movable contact (not shown) at the tip of the movable conductor 12b and a fixed contact (not shown) at the tip of the fixed conductor 12a are accommodated in a vacuum vessel is provided between 3a and 13b. The fixed conductor 12a is connected and fixed to a terminal conductor 14a penetrating one insulator 13a,
b is connected to a terminal conductor 14b penetrating the other insulator 13b.

A feature of the present invention is that, in FIGS. 1 to 3, the connecting cylinder 3 is attached to the end of a movable conductor 12b extending from a movable contact (not shown) in the vacuum valve 12 to the outside. It is connected and fixed, and the sliding electrode 2 is accommodated and housed in an annular concave portion formed on the inner surface of the connecting cylinder 3, and the connecting cylinder 3 is provided through an insulator (not shown). Slidably fitted to the distal end portion 14c of the terminal conductor 14b, and the sliding electrode 2 is elastically interposed between the connecting tubular body 3 and the distal end portion 14c of the terminal conductor to conduct electricity. The point is that the 12b side and the terminal conductor 14b side are always in a conductive state. In the figure, the connection cylinder 3 and the movable conductor 12b are positioned on the same straight line with the center axis thereof.
Although it is screwed at 1, it goes without saying that other mounting means may be used.

According to this embodiment, the conventional movable conductor 1
Even when the flexible lead wire required for electrical connection between the terminal conductor 2b and the terminal conductor 14b is not used at all, conduction can be ensured both at rest and during sliding. Therefore, the misalignment of the movable conductor due to the flexible lead wire can be eliminated, and the space occupied by the flexible lead wire can be omitted, and the casing can be reduced in size accordingly. .

Here, the sliding electrode 2 used in the present invention will be described. A typical structure of the sliding electrode is a ladder-like (louver-like) elastic contact made of a highly conductive elastic metal such as beryllium copper. ) Is a small contact assembly closely arranged in a row, and elastically interposed between conductor electrodes that can move back and forth or rotate while sliding with each other. The contact resistance between the conductor electrodes is small due to the target and multipoint contact, so that a large current can be supplied.

In the case of FIGS. 1 to 3, the inner surface of the connecting cylinder 3 is provided with the terminal conductors 14 at two locations on inner wall portions 32 a and 32 b before and after the sliding electrode 2 is accommodated.
A structure is employed that slidably contacts the outer peripheral surface of the tip portion 14c of FIG. In this case, the inner surface of the connecting cylinder 3 and the outer peripheral surface of the distal end portion 14c are supported by at least two places of the inner wall portions 32a and 32b.
When the connecting cylinder 3 slides back and forth with the terminal conductor 14b inserted, there is obtained an advantage that the center axes of the connecting cylinders 3 can be moved smoothly without being shifted, and from this point also, the misalignment which has conventionally been a problem It can contribute to solving the problem.

Further, an example of this embodiment will be described with reference to FIGS. 1 to 3. An elongated hole 14d provided in the terminal conductor 14b is described.
Is provided with a pin 41 passing therethrough.
Both ends of the pin 41 are fixed to the connecting cylinder 3 at one end, and are inserted into elongated holes 33a provided at the other ends of the connecting members 33, 33 extending along the terminal conductor 14b. It is attached in the state where it was set. This connection member 3
A long hole 33a provided at the other end of each of the third and third holes 33 is for securing a wipe size.

In this embodiment, an operating lever 15a extending from the main shaft 15 is provided at the tip of the pin 41.
2a and 3b, when the circuit is closed, the operation lever 15 is moved by the counterclockwise movement of the main shaft 15.
The movements of the main shaft 1a and the main shaft 1a at the time of opening are controlled by a spring 5 provided between the pin 41 and the connecting cylinder 3.
The movement of the operation levers 15a, 15a due to the clockwise movement of 5 is transmitted to the connection cylinder 3 through the connection member 33, and the opening and closing operation of the vacuum valve 12 is performed. Is not limited to such an operation mechanism, and other operation means may be adopted.

[0015]

As described above, the on-column vacuum switch of the present invention is constructed as described above, so that the misalignment of the movable conductor can be eliminated and the size of the casing can be reduced.
It is possible to prevent a reduction in the current-carrying characteristics and pressure resistance characteristics of the vacuum valve, and to contribute to prolonging the switching life. In addition, there is an excellent effect that it can contribute to downsizing of the entire on-column vacuum switch. Therefore, the present invention has extremely high industrial value as a pole-mounted vacuum switch which has solved the conventional problems.

[Brief description of the drawings]

FIG. 1 is a top sectional view of a main part of a vacuum switch on a pillar according to the present invention as viewed from above.

FIG. 2 is a sectional view of a main part of a lateral side surface of the on-column vacuum switch of the present invention.

FIG. 3 is a lateral side view of a main part of the on-column vacuum switch of the present invention.

FIG. 4 is a sectional view of a main part of a side surface of a conventional on-column vacuum switch.

[Explanation of symbols]

Reference Signs List 11 casing, 12 vacuum valve, 12a fixed conductor, 12b movable conductor, 13a, 13b insulator, 14
a, 14b terminal conductor, 14c tip, 14d long hole, 15 main shaft, 15a operation lever, 2 sliding electrodes,
3 Connection cylinder, 31 bolt, 32a, 32b Inner wall portion, 33 Connection member, 33a Slot, 41 pin, 5
Spring.

Continuing from the front page (72) Inventor Yoshiro Fujii 2-56, Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Prefecture Inside Nihon Insulators Co., Ltd. (72) Inventor Hiroshi Kato 1 Inariyama, Inuyama-shi, Aichi Prefecture Energy Support Co., Ltd.

Claims (2)

[Claims] 1. A connecting cylinder having a sliding electrode built in a movable conductor extending from a movable contact in a vacuum valve to the outside,
A terminal conductor provided to penetrate the insulator is slidably fitted to the connecting cylinder, and via the sliding electrode,
A pole-mounted vacuum switch, wherein the movable conductor and the terminal conductor are electrically connected. 2. The on-column vacuum switch according to claim 1, wherein the sliding electrode accommodated in the inner surface of the connecting cylinder is slidably in contact with an outer peripheral surface of the terminal conductor.