JPH07288071A - Switch - Google Patents

Abstract

PURPOSE:To provide a compact and highly reliable switch by preventing flash-over when overvoltage is generated. CONSTITUTION:When a conductor 3, a charging part of an opening-closing part, is installed on an insulating barrier 5, a projection 10 having almost the same cross section as a support metal fitting 9 to install both is arranged on the conductor 3, and the conductor 3 is installed on the insulating barrier 5 through the projection 10. A part except the projection 10 of the conductor 3 is put in a noncontact condition from the insulating barrier 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch.

[0002]

2. Description of the Related Art Although there are many types of switches of this type, a vacuum circuit breaker shown in FIG. 5 will be described as an example. FIG. 5 shows a side sectional view of a typical vacuum circuit breaker. In this figure, a vacuum circuit breaker of this type includes a frame 1 of a grounded metal / metal housing, an insulating barrier 5 for supporting the conductors 2 and 3 and a vacuum valve 4, which are high-voltage charging parts, and a movable shaft 6 of the vacuum valve 4. And an insulating operating rod 7 for transmitting an operating force of an operating mechanism portion (not shown) provided inside the frame 1.

FIG. 6 is an enlarged view of portion A'in FIG. In the figure, the conductor 3 is fixed to the insulating barrier 5 with bolts. By the way, since it is difficult to completely remove minute irregularities that may exist on the surfaces of the conductor 3 and the insulating barrier 5, there is generally a wedge-shaped minute air gap 8 between the surface of the conductor 3 and the insulating barrier 5. It often occurs. In the air gap 8, since the distance between the electric charge induced on the surface of the insulating barrier 5 by the voltage of the conductor 3 and the conductor 3 which is a high voltage charging portion is small, the electric field concentrates, and corona discharge, lightning impulse, etc. Was the cause of the flashover when the overvoltage occurred.

Therefore, for example, a large distance is provided between the frame 1 and the conductor 3, which are ground metal, and the frame 1 and the conductor 3 are separated from each other.
By reducing the electric field between them, the corona discharge and withstand voltage characteristics have been made to satisfy the required specifications and standard values.

[0005]

However, in such a switch, the whole switch is enlarged by increasing the distance between the frame and the conductor. An object of the present invention is to provide a compact and highly reliable switch which prevents flashover when an overvoltage occurs.

[0006]

In order to achieve the above object, the present invention provides an insulating support part for insulating and supporting a charging part of an opening / closing part, a support fitting for mounting the charging part on the insulating support part, and an insulating part for the charging part. The present invention is characterized in that it has a protrusion provided on the attachment portion to the support portion and has a cross-section that is substantially the same as the cross-section of the support fitting, and that the portion of the charging portion other than the protrusion is not in contact with the surface of the insulating support portion. .

[0007]

In the above structure, the cross section of the support fitting and
Since the cross section of the protrusion provided on the attachment part of the charging part to the insulating support part is made substantially the same, it can be considered that the support metal part and the protrusion part of the charging part are electrically continuous, and the electric field relaxation Can be achieved. In addition, since the charging part is attached to the surface of the insulating support part in a non-contact manner, a sufficiently large distance is secured as compared with the minute unevenness that may exist in the charging part and the insulating support part. It is possible to eliminate the influence of the electric field generated by the charges induced in the.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a switch according to an embodiment of the present invention. In the figure, a frame 1 which is a metal housing
And a conductor 2, a conductor 3 and a vacuum valve 4 which are high voltage charging parts.
Insulating barrier 5 for supporting the movable shaft 6 of the vacuum valve 4
It is the same as that of the conventional one, which is composed of an insulating operating rod 7 that is connected to the insulating operating rod 7 for transmitting an operating force of an operating mechanism portion (not shown) provided inside the frame 1.

In addition, the conductor 2, which is a charged part other than the conductor 3,
Since the vacuum valve 4 is integrally cast and embedded in the insulating barrier 5, a minute air gap does not exist between the charging portion and the surface of the insulator. Further, the metal fitting 11 of the insulation operating rod 7 is also integrally cast on the insulation operating rod 7. Regarding the portion 12 of the conductor 2 protruding from the insulating barrier 5, the connecting conductor 13 is fixed by bolts.

FIG. 2 is an enlarged view of part A in FIG. In the figure, the conductor 3 is fixed to the support metal 9 embedded in the insulating barrier 5 with bolts, but the portion of the conductor 3 that abuts the support metal 9 has a protrusion 10 having the same cross section as the support metal 9. Has become. Therefore, the distance between the surface of the conductor 3 and the surface of the insulating barrier 5 becomes the height of the protrusion 10, and the two are not in contact with each other.

In such a structure, the high-voltage charging section other than the conductor 3 is cast integrally with the insulating barrier 5, and there is no minute air gap between them. Further, as the insulating material of the insulating barrier 5, epoxy resin, polyester resin, or the like is used.
It is more than 10kV / mm. Therefore, it is sufficiently higher than the dielectric breakdown electric field strength in the air of about 3 kV / mm.

Further, in FIG. 2, the support metal 9 and the conductor 3
Since the projections 10 can be regarded as the same continuous cylindrical shape in terms of electric field, there is no electric field concentration at the end of the conductor 3 and the electric field is relaxed. On the other hand, the other portion of the conductor 3 has a sufficiently large distance as compared with the conventional minute air gap 8 shown in FIG. 6, so that the electric field due to the charges induced on the surface of the insulator is weak ( The electric field strength is inversely proportional to the square of the distance, so the smaller the distance, the larger. Therefore, the corona generation voltage and the withstand voltage value can be improved.

Further, as shown in FIG. 3, the connecting conductor 13 is attached to the portion 12 of the conductor 2 protruding from the insulating barrier 5, and the connecting surface of the connecting conductor 13 is the surface of the protruding portion 12 of the conductor 2. Since it is smaller than the above, there is no minute air gap on the surface of the insulator.

As described above, according to this embodiment, since there is no minute air gap between the charging portion and the surface of the insulator, the electric field concentration due to the air gap can be eliminated, and the corona characteristic and the withstand voltage characteristic can be eliminated. Can be improved. In addition, it becomes compact because it is not necessary to keep the distance between the frame 1 and the conductor 3 as in the conventional case.

On the other hand, FIG. 4 shows another embodiment of the present invention.
By projecting the support metal 9 from the surface of the insulating barrier 5, the protrusion of the mounting portion of the conductor 3 is omitted. According to this embodiment, the conductor 3 can be a flat plate-shaped conductor, and the conductor can be easily manufactured. In addition, since the electric field has the same shape of the charging portion as that shown in FIG. 2, the electric field is relaxed, and the corona characteristics and the withstand voltage characteristics can be improved.

[0016]

As described above, according to the present invention, an insulating support part for insulating and supporting the charging part of the opening / closing part, a support fitting for mounting the charging part to the insulating support part, and an attachment of the charging part to the insulating support part. Section has a protrusion that is approximately the same in cross section as the support bracket, and the parts other than the protrusion of the charging part are not in contact with the surface of the insulating support part, so a flashover occurs when an overvoltage occurs. And a compact and highly reliable switch can be obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view of a switch according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a partially enlarged view of a switch according to another embodiment of the present invention.

FIG. 5 is a side sectional view of a typical switch.

FIG. 6 is a partially enlarged view of [FIG. 5].

[Explanation of symbols]

2, 3 ... Conductor, 5 ... Insulation barrier, 9 ... Supporting hardware, 10 ...
Protrusion.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Miyazawa 1st Toshiba Town, Fuchu City, Tokyo Toshiba Corporation Fuchu Factory

Claims (4)

[Claims] 1. An insulating support part for insulating and supporting the charging part of the opening / closing part, a support metal fitting for mounting the charging part on the insulating support part, and a support provided on a mounting part of the charging part to the insulating support part. A switch having a projection having a cross section substantially the same as the cross section of the metal fitting, and a portion other than the projection of the charging section being in non-contact with the surface of the insulating support section. 2. The charging section includes: an insulating support section that insulates and supports the charging section of the opening / closing section; and a support fitting that projects from the insulating support section toward the charging section and mounts the charging section to the insulating support section. A switch which is not in contact with the surface of the insulating support portion except for the contact with the supporting metal fitting. 3. An insulating support part for insulating and supporting the charging part of the opening / closing part, and a connecting conductor having one end connected to an external device and the other end connected to a protruding part protruding outside the insulating support part of the charging part. And a mounting surface of the connection conductor to the protruding portion of the charging portion is smaller than a surface of the protruding portion of the charging portion. 4. The switch according to claim 1, wherein the charging portion is embedded in the insulating support portion except a portion attached to the support fitting. .