JPS61208714A - Tank type gas breaker - 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 [Technical Field of the Invention] The present invention relates to an improvement in a tank-type gas circuit breaker in which a circuit breaker is housed in a metal tank filled with an insulating gas.

[Technical background of the invention and its problems] In response to rising land prices in the suburbs of cities, efforts are being made to reduce the amount of land needed by downsizing equipment in order to reduce the cost of constructing substations. From this point of view, circuit breakers are constantly becoming smaller and smaller.
Cost reduction is required.

FIG. 5 is a sectional view showing an example of a conventional tank type gas circuit breaker. In FIG. 5, 1 is a cylindrical metal tank, and an insulating gas 2 having good arc-extinguishing performance, such as SFB gas, is sealed inside this tank. Inside the tank 1, a fixed electrode section 3 and a movable electrode section 4 are supported by insulating tubes 5 and 6 provided at the ends of the tank, respectively. The movable electrode section 4 is driven by an insulated operating rod 9 and a shaft 10 via a link 8 from a rotary seal section 7 by an operating mechanism (not shown). Also, during the shutoff operation, shaft 1
High-pressure gas is formed by compression between the buffer cylinder 11 connected to 0 and the fixed piston 12,
The arc is extinguished by being sprayed between the fixed arc contact 13 and the movable arc contact 14. Note that 15 is a conductor electrically led out to an electric path outside the circuit breaker.

As described above, in the conventional example, the insulating tube 6 for supporting the movable electrode section 4 and the insulating tube 5 for supporting the fixed electrode section 3 are prepared separately and must be placed at separate positions; An insulated operating rod 9 for operation is disposed in the insulating tube 6 that supports the movable electrode section 4, and measures are taken to prevent gas passing through the arc from blowing out in the direction of the insulating tube 6 that supports the interrupting section. However, it has the disadvantage that it requires a complex structure, such as the need to have sufficient voltage resistance even if it is blown out, and that the circuit breaker cannot be made smaller.

[Object of the Invention] The present invention was made based on the above-mentioned circumstances, and an object of the present invention is to provide a small tank-type gas circuit breaker with a simple structure for an insulating member that supports a circuit breaker.

[Summary of the Invention] In order to achieve the above object, the present invention provides an insulating member that connects a fixed contact portion and a movable contact portion, and further includes an insulating member that supports the entire interrupting group within a metal tank. It is designed to be installed.

[Embodiments of the Invention] Hereinafter, embodiments of the tank type gas circuit breaker of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing the first embodiment of the present invention,
Here, only the points different from those in FIG. 5 will be explained, and the same parts will be given the same reference numerals and the explanation thereof will be omitted. 20 is a first insulator that connects the fixed electrode section 3 and the movable electrode section 4. The movable electrode section 4 is configured to be driven by the insulated operating rod 9 and the shirt 10 by an operating piston 21 provided in the operating mechanism section 18. 22 is the movable electrode section 4
The second insulator extends perpendicularly to the driving direction of the insulator 20 and is integrally attached to the side surface of the insulator 20. Second
The insulator 22 is fixed to the inner peripheral wall surface of the metal tank 1,
The interrupter is mechanically fixed by itself. 23 is an arc generated between the fixed arc contact 13 and the movable arc contact 140. After the high pressure gas compressed by the movable piston 24 is blown onto the arc 23 as shown by the arrow, It is designed to be exhausted to the electrode side. Reference numeral 31 denotes an opening at the end of the metal tank 1 in the direction of the central axis, and has an outer 7-lunge shape to facilitate assembly of the shutoff part.

According to the first embodiment of the present invention described above, the first insulator 20 mechanically connects the movable electrode section 4 and the fixed electrode section 3.
Because the second insulator 22 that fixes the entire isolation group inside the metal tank 1 is installed at the same location or as the same member, and the second insulator 22 is placed in the side view of the first insulator 20, The insulating member 22 that fixes the interrupting part in the metal tank 1 can be placed independently of the operating mechanism part 18, and the insulating member 22 is arranged in the exhaust direction of the high-temperature gas blown through the arc during the interrupting operation. Since there is no need to do so, the structure is simple and the creeping voltage withstand performance is excellent. Therefore, a tank-type gas circuit breaker can be obtained which is small and simple in structure and therefore economically superior.

FIG. 2 is a perspective view of an insulating member for explaining a second embodiment of the present invention. This is for connecting the fixed electrode part 3 and the movable electrode part 4 as shown in FIG. 1, and for supporting and fixing them to the metal tank 1. This is made up of a plurality of rod-shaped insulators 25 and an insulator 26 having a shape in which a part of a cylinder is notched in the axial direction, and a columnar insulator 27 that is integrated with the insulators 26.

It is clear that an insulating member having such a structure also has the same effect as the embodiment shown in FIG. Note that the insulator 26 can also be shaped like a plate instead of a cylinder with a part cut out in the axial direction.

FIG. 3 is a front view of the insulating member viewed from the longitudinal direction of the tank for explaining the third embodiment. In this case, the portion supporting the interrupting portion is formed of a plurality of rod-shaped insulators 28. The effects in this case are the same as those described above, but from the previous embodiment, the insulator 28
The mechanical strength of the material can be increased.

FIG. 4 is a front view of the inside of the tank viewed from the longitudinal direction, showing a case where an insulating member is fixed to a tank for explaining a fourth embodiment of the present invention. That is, a short pipe part 29 is provided in a part of the metal tank 1, and a second insulator 22 is fixed to a lid 30 of this short pipe part 29.
Since the creepage distance of the circuit breaker 2 can be increased, the insulation gap between the interrupting part and the tank inner wall can be narrowed, which has the effect that the metal tank 1 of the circuit breaker does not have to be made large.

[Effects of the Invention] According to the present invention described above, the insulating member that supports the interrupting portion has a simple structure, and a small tank-type gas circuit breaker can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a tank-type gas circuit breaker according to the present invention, and FIGS.
FIG. 5 is a front view of an insulating member for explaining the embodiment, and FIG. 5 is a sectional view showing an example of a conventional tank-type gas circuit breaker. DESCRIPTION OF SYMBOLS 1... Metal tank, 2... Insulating gas, 3... Fixed electrode part, 4... Movable electrode part, 9... Insulation operation Orad, 13... Fixed arc contactor, 14... ...Movable arc contactor 15...Conductor, 20.25.26...First insulator 22.27.28...Second insulator, 30...
·lid.

Claims (7)

[Claims] (1) A cut-off part consisting of a fixed electrode part having a fixed arc contact and a movable electrode part having a movable arc contact is housed in a metal tank filled with insulating gas, and the movable electrode part is controlled by an external operating mechanism part. In a tank-type gas circuit breaker that drives the movable arc contact, a first insulating member is provided that connects the movable arc contact and the fixed arc contact, and a side surface of the first insulating member is provided with a first insulating member that connects the movable arc contact and the fixed arc contact. A tank-type gas circuit breaker, characterized in that a second insulating member extending in a direction substantially perpendicular to the direction is provided, and the shutoff portion is mechanically fixed within the metal tank only by the second insulating member. . (2) The tank-type gas circuit breaker according to claim 1, wherein the first and second insulating members are made of an integral insulator. (3) The tank-type gas circuit breaker according to claim 1, wherein the first insulating member has a cylindrical shape. (4) The tank-type gas circuit breaker according to claim 1, wherein the first insulating member is composed of a plurality of rod-shaped members. (5) The tank-type gas circuit breaker according to claim 1, wherein the second insulating member is housed and fixed in a short pipe section provided in the tank. (6) The tank-type gas circuit breaker according to claim 1, wherein the second insulating member is composed of a plurality of columnar members. (7) The tank-type gas circuit breaker according to claim 1, wherein at least one end of the tank in the central axis direction is formed into an outer flange shape.