JPS61211923A - Switch apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to switchgear equipped with bushings, such as circuit breakers and load switches.

[Conventional technology]

FIG. 5 is a sectional view showing an example of a three-phase AC breaker as a conventional switching device, showing an upper container (1), an intermediate container (2)
, a lower container (3) in which SF and gas are sealed as arc-extinguishing media. The unit (5) consists of an upper container (1) and an intermediate container (
2) and a bushing (6) sandwiched between the intermediate container (2) and the lower container (3). This bushing (6) is a conductor plate (ffa), (g
b) , (fc) are arranged and are integrally made of an insulating material such as epoxy. A flat part (6a) is formed on one side of the bushing (6), and a convex part (6b) is formed on the other side.
is formed.

Next, the operation of the above configuration will be explained. In Figure S, each phase is cut off (22) (r) is in a closed circuit state, and the current flows through the upper conductor plates (ga) and (b).

(gc), passes through the breaker unit (3), and flows to the lower conductor plates (fa), (zab), and (ffc), and electrical insulation between each phase is provided by the bushing (6) located between each phase. The movable contact (13) of the convex portion is separated from the fixed contact (10), and the breaker (1) is opened. Dielectric breakdown between each phase due to decomposition gas generated by the arc energy generated at this time is mainly prevented by the convex portions (&b).

[Problem that the invention seeks to solve]

Switchgears such as conventional three-phase AC circuit breakers are constructed as described above, and in order to prevent dielectric breakdown due to the generation of decomposed gas, the insulation distance between each phase must be at least a predetermined value. ('4a) It is necessary to considerably increase the length of the convex portion (6b).

Therefore, the overall shape of the upper and lower bushings (6) had to be made awkward, which necessitated the overall size of the three-phase AC breaker. In addition, the metal of the fixed contact (lO) and the movable contact (13) is melted by the arc generated when the current is cut off by the cutoff unit (5), and the molten metal floats in the container (li) and eventually It is deposited on the upper surface of the fixed contact (tO) of the breaker unit (5), on the flat surface (6a) of the bushing (6), etc. This substantially reduces the insulation distance along the surface of the bushing (6), so that the bushing There was a problem in that the distance between the correlations in (6) had to be made large and the bushing (&) had to be made large, and as a result, the entire device had to be made large.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide an opening/closing device in which the bushing itself can be made smaller and the entire device can be made smaller.

[Failure to solve the problem]

The opening/closing device according to the present invention has a convex portion formed on the upper side of a bushing located between each phase, and a recessed portion formed on the lower side.

[Effect]

In this invention, the distance along the surface of the bushing between each phase is large (ie, the substantial insulating distance between the phases is large), and no metal melt is deposited on the surface of the bushing.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show one embodiment of the present invention, and the same or corresponding parts as in FIG. 5 are designated by the same reference numerals, and the explanation thereof will be omitted. As shown in FIG. 2, the bushing (lX) is integrally made of an insulating material such as epoxy. The end of the bushing (16) is a conductor plate (ffa), (tb
), a terminal (tth) electrically connected to (ffc),
(ttb) and (ttc) are being thrown. Holes (/2a), (/
(b) and (/2c) are formed, which have the same size (lλ
Fixed contacts (lO
) is attached. The fixed contact (10) is electrically connected to the movable contact (/j) of the breaker unit (5).

Among the bushings (16), the container (one) and the breaker unit (
5) There is a convex part (l≠) on both the upper and lower parts.
is formed. A triangular convex portion (15) is formed on the upper part of the bushing (16) between each phase. A V-shaped recess (17) is located at the bottom of the bushing (16) between each phase.
) is formed.

Next, the operation of the above configuration will be explained. Figure 1 shows that the insulation between the breaker unit (j) of each phase and the container (ri) is maintained by a convex part (brightness). is the convex part (ts) M
and recess C/7). When an opening command is given to this three-phase AC breaker in this state, the fixed contact (lO) and the movable contact (13) are separated, an arc is generated between both contacts (to) and (tS), and it disappears. do. The arc extinguishing gas decomposed by this 7-queue energy diffuses in all directions, but the dielectric breakdown between each phase due to this decomposed residue is caused by the distance along the surface of the bushing (16) between the phases or by a sharp convexity. part (tS) and recessed part (17
) is prevented. Further, insulation between the breaker unit (ri) and the container (4') is prevented by a convex portion (/hiro).

In addition, the metal of the fixed contact (10) and the movable contact (/3) is melted by the arc generated when the current is cut off by the breaker unit (ri), and the molten metal is transferred to the container (
4'). This floating material is deposited on the upper surface of the lower container (J), the fixed contact (10), etc., or is deposited on the parts between each phase of the bushing (16) due to the action of the convex portions (tr). The insulation distance between the phases is not substantially reduced.

In the above embodiment, a three-phase AC breaker was explained in which each phase was arranged horizontally and linearly, but as shown in Fig. You may. In this case, the trap also has a convex part (/?) formed on the upper side of the bushing (/1) between each phase, and a concave part (not shown in the figure) on the lower side of the bushing (/1) corresponding to this convex part (ly). ) is formed. Furthermore, although the first and second embodiments described above are for three-phase AC circuit breakers, the present invention is not limited to three-phase AC circuit breakers. It can also be applied to switches such as disconnectors. Further, although the recess (17) has been described as having a V-shaped cross section and a single stroke, it may be formed in a plurality of cylinders.

〔Effect of the invention〕

As explained above, according to the present invention, by forming the convex portion on the upper side between each phase of the bushing and forming the recessed portion on the lower side, the distance between each phase along the surface of the bushing can be roughly increased. The substantial insulation distance between the phases of the bushing becomes thicker, the dimension between the phases of the bushing can be reduced, and the entire switching device can be downsized. In addition, since a convex portion is formed on the upper side between each phase of the bushing, molten metal that is generated when an arc occurs does not accumulate between each phase of the bushing, and the insulation performance due to molten metal between each phase is reduced. There is no risk of it happening.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention.
The figure is a cross-sectional view, Figure 2 is a cross-sectional view taken along the line 45 in Figure 1, and Figure 3 is a cross-sectional view taken along the in-m line in Figure 2. The figure is a plan sectional view of main parts showing another embodiment of the present invention. Fig. 5 is a sectional view showing an example of a conventional three-phase AC breaker. (Container, CI)... Breaking Unit (opening/closing unit), (zr), (l?)...Protrusion, (16)', (l
r)...Bushing, (/7)...Recess. In addition, in each figure, the same reference numerals indicate the same or equivalent parts.
2, 7) 15: Convex part 16: Bushing 17: Concave part old: 7; Thin 7". 19: 8 people and broom 5 figure

Claims (1)

[Claims] A switchgear device comprising a three-phase switching unit in a container containing an arc-extinguishing medium, and a bushing that fixes the switching unit in the container and forms electrical insulation between the phases. An opening/closing device characterized in that the bushing is provided with a convex portion on the upper side and a concave portion on the lower side.