JP2008277139A - Mold frame of circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that, when a conventional mold frame is manufactured by casting or molding, a cross-sectional shape is formed into a U-shaped form by opening only one direction out of four side surfaces for separating it from a mold, and thereby the connection work of a conductor, a shunt or the like connected to a vacuum valve is restricted from the direction of the opening, and the length of each conductor is increased. <P>SOLUTION: A member supporting a fixed-side terminal of a vacuum circuit breaker, and a pair of insulating barrier members arranged nearly in parallel to each other, and insulating both side surfaces of the vacuum circuit breaker are integrally cast or molded, and conductors are allowed to be connected to both the terminals of the vacuum circuit breaker from open ends of the pair of insulating barrier members. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mold frame for a vacuum circuit breaker mounted on a switchgear used in power transmission / distribution and power reception facilities.

  The main components of a conventional switchgear vacuum circuit breaker have the same configuration as that shown in FIGS. Current is supplied or cut off by a contact (not shown) provided inside the vacuum valve 1. One side of the vacuum valve 1 is fixed to the fixed-side terminal portion 2, and the contact is movable on the opposite side, so that a flexible conductor 3 is connected. On the movable side, there are an insulating rod 4 and a contact pressure spring (not shown) for connecting the vacuum valve 1 and an operating mechanism (not shown). In this switchgear vacuum circuit breaker, a single pole portion including the vacuum valve 1 is supported by a mold frame as shown in FIG. 5 and the withstand voltage performance between phases and ground is maintained (Patent Document 1, Patent). Reference 2).

JP 2000-357442 A JP 2006-49247 A

  The conventional mold frame 5 is made of a material that can be electrically insulated (typically an epoxy resin), and generally manufactured by casting or molding. Therefore, as shown in FIG. 5, in order to release the mold from the mold, only one of the four side surfaces is opened, and the cross-sectional shape surrounding the vacuum valve 1 is U-shaped. For this reason, there has been a problem that the connection work of the conductor and shunt connected to the vacuum valve is restricted from the direction of the open portion, and the length of each conductor becomes long.

  A mold frame of a circuit breaker according to the present invention is a casting unit in which a member that supports a fixed terminal portion of a vacuum circuit breaker and a pair of insulating barrier members that are arranged substantially in parallel and insulate both side surfaces of the vacuum circuit breaker. Alternatively, the conductor can be connected to both terminal portions of the vacuum circuit breaker from the open ends of the pair of insulating barrier members while being molded.

According to the mold frame of the circuit breaker of the present invention, the conductors and shunts connected to the single pole portion of the vacuum circuit breaker can be connected from either side by opening the both sides of the pair of insulating barrier members. It becomes possible and can be connected at the shortest distance, so that the conductor length can be minimized and the conductor resistance of the main circuit portion can be reduced.
In addition, the material cost of the conductor itself can be reduced, the work for attaching the conductor can be improved, and the storage efficiency in the tank can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
1A and 1B are diagrams showing a mold frame of a circuit breaker according to Embodiment 1 of the present invention, in which FIG. 1A is a side sectional view, FIG. 1B is a front view, and FIG.
FIG. 2 is a simplified cross-sectional view of the line AA in FIG.
1 and 2, the vacuum circuit breaker housed in a container filled with an insulating gas such as SF 6, dry air, nitrogen, carbon dioxide, etc. has a fixed terminal 2 connected to the fixed side of the vacuum valve 1. The flexible conductor 3 is connected to the movable side.
By connecting a conductor (not shown) of the main circuit to the flexible conductor 3 of the fixed side terminal portion 2 and the movable side terminal portion, a main circuit as a switch gear is configured.
The movable side of the vacuum valve 1 is connected to an operating mechanism (not shown) via an insulating rod 4. A contact pressure spring (not shown) for applying pressure to a contact (not shown) in the vacuum valve 1 is arranged on the movable side of the vacuum valve 1.
A mold frame 5 according to the present invention supports a single electrode portion (vacuum valve 1, fixed side terminal portion 2, movable side terminal portion, main circuit terminal, etc.) including these vacuum valves 1.
The mold frame 5 includes a member 5b that supports the fixed terminal portion using an insulator such as an epoxy resin, a mounting portion 5c, and a pair of insulating barrier members 5a that insulate the spaces between the phases on both sides of the vacuum valve 1. Are integrally cast or molded to maintain the withstand voltage performance between phases and ground.
Reference numeral 5b denotes a connection frame 5b that is integrated between a pair of insulating barrier members 5a and 5a at the time of casting or molding, and supports the fixed-side terminal portion 2 of the vacuum valve 1. Reference numeral 5c denotes a mold frame mounting portion that supports the entire monopolar portion.
Further, the pair of insulating barrier members 5a and 5a have a taper angle for punching and are arranged substantially in parallel so that both sides are opened as shown in FIG. 2, and vacuum is opened from the open ends 5d1 and 5d2 on both sides. The conductors of the main circuit can be connected to both terminal portions of the valve 1 from either side of the mold frame 5, respectively.

Embodiment 2. FIG.
3A and 3B are views showing a mold frame of a circuit breaker according to Embodiment 2 of the present invention, in which FIG. 3A is a side sectional view and FIG. 3B is a front view.
The pair of insulating barrier members 5a and 5a have a die-cut taper angle as in the second embodiment, and are arranged substantially in parallel to open both sides as shown in FIG. The conductors of the main circuit can be connected to both terminal portions of the vacuum valve 1 from 5d1, 5d2 from either side of the mold frame 5, respectively.
This mold frame 5 has a plurality of pairs of insulating barrier members 5a arranged on both side surfaces of a plurality of vacuum circuit breakers arranged side by side on the base 5e, with the phases of the phases being staggered, and between adjacent insulating barrier portions. Are arranged with the gaps at equal intervals.
By arranging in this way, the gaps between the phases are made equal so that the taper angles become parallel, and the distance between the phases of the vacuum valves 1 arranged in parallel is shortened.
As shown in FIG. 5, the conventional mold frame 5 has a structure in which a taper angle is provided so that it can be easily separated from the mold. However, the mold frame 5 has a shape that spreads outward, and the spread portion comes into contact with the mold frame 5. The width, that is, the interphase pitch cannot be reduced, and the tip becomes the maximum dimension.
For this reason, when the distance between phases is shortened to a distance that can secure an insulation distance using the mold frame 5, the distance between the phases cannot be reduced because the tip portion has the maximum dimension.
Specifically, according to the second embodiment, for example, the mold frame 5 has a shape in which both sides of the mold frame 5 are opened, and the S-phase mold frame 5 is fixed in the opposite direction to the R and T phases. The taper angles are parallel to each phase, and both side surfaces of the mold frame 5 are parallel to each phase. As a result, when the interphase pitch is reduced, the mold frame 5 that is in contact with the mold frame 5 cannot be reduced, and thus the contact between the mold frames 5 is eliminated by the parallelism, and the interphase pitch can be reduced. (P1 in FIGS. 3 and 4 <P2 in FIG. 5).
The mold frame 5 includes a manufacturing method in which a pair of insulating barrier members are integrally cast or molded as in the first embodiment, and a plurality of pairs of insulating barrier members are cast or molded in a lump, although not shown. A production method can be considered.

Embodiment 3 FIG.
4A and 4B are views showing a mold frame of a circuit breaker according to Embodiment 3 of the present invention, in which FIG. 4A is a side sectional view and FIG. 4B is a front view.
In FIG. 4, the insulating barrier member 5a of each phase has at least one side or both sides of the longitudinal side edge,
By extending to the outer edge part of the attachment part 5c, the extended side surface becomes a barrier function, and the insulation distance can be further secured. The attachment portion 5c is integrally formed with the insulating barrier member 5a during casting or molding.
As described above, by forming the mold frame 5 on both sides and extending one side or both sides of the both sides, it becomes possible to extend the insulation distance between the phases and the ground as a barrier, thereby enhancing the dielectric strength. . Furthermore, by adding this barrier function, it is possible to improve the severe part of the withstand voltage performance, and it is possible to apply to a voltage class one rank higher.

It is a figure which shows the mold frame of the circuit breaker in Embodiment 1 of this invention, (a) is a sectional side view, (b) is a front view, (c) is a top view. It is the simple sectional view which looked at the AA line of Drawing 1 (a) in the direction of an arrow. It is a figure which shows the mold frame of the circuit breaker in Embodiment 2 of this invention, (a) is a sectional side view, (b) is a front view. It is a figure which shows the mold frame of the circuit breaker in Embodiment 3 of this invention, (a) is a sectional side view, (b) is a front view. It is a front view which shows the conventional form.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum valve 2 Fixed side terminal part 3 Flexible conductor 4 Insulation rod 5 Mold frame 5a Insulation barrier member 5b Connection frame 5c Attachment part 5e Base.

Claims (5)

  A member that supports the fixed terminal portion of the vacuum circuit breaker and a pair of insulating barrier members that are arranged substantially in parallel and insulate both side surfaces of the vacuum circuit breaker are integrally cast or molded, and the pair of insulating barrier members A mold frame of a circuit breaker characterized in that a conductor can be connected to both terminal portions of the vacuum circuit breaker from an open end.   2. The mold frame of a circuit breaker according to claim 1, wherein the fixed terminal portion of the vacuum circuit breaker is supported by a connecting frame integrated between the both end portions by the integral casting or molding.   The peripheral edge portion of the insulating barrier member extends to at least the outer edge portion of the mounting portion integrated with the insulating barrier member by the integral casting or molding, thereby enhancing the dielectric strength of the vacuum circuit breaker. The mold frame of the circuit breaker according to claim 1.   Insulating barriers having a plurality of pairs of insulating barrier members each having a taper angle for die cutting and insulating both side surfaces of the plurality of vacuum circuit breakers arranged side by side, with the directions of the insulating barrier portions being staggered A mold frame for a circuit breaker, which is arranged in a state where the gaps between the parts are equally spaced.   5. The mold frame for a circuit breaker according to claim 4, wherein the insulating barrier member is cast or molded in a plurality of pairs at a time or in pairs.

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