JP2001118472A - Gas circuit breaker - Google Patents

Abstract

(57) [Summary] [Problem] To provide a gas circuit breaker that has good assembling workability, high reliability, simplification of production management and cost reduction with a small number of parts. In a multi-phase integrated gas circuit breaker in which a plurality of arc extinguishing chambers (4) for interrupting a multi-phase current are enclosed in a grounded container (2) together with an insulating gas, a pole defining the arc extinguishing chamber is provided. The inter-insulation cylinder is an integrated inter-pole insulation cylinder 4d formed integrally with the polyphase.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker installed in an electric station such as a power plant or a substation, and more particularly, to a gas circuit breaker in which the shape and mounting structure of an insulating cylinder between poles are improved.

[0002]

2. Description of the Related Art In electrical stations such as power stations and substations, electrical equipment such as circuit breakers and current transformers have excellent insulation and arc-extinguishing properties due to difficulties in obtaining land and miniaturization of equipment. A gas-insulated switchgear (hereinafter, referred to as GIS) sealed with an inert gas is installed.

In the GIS, not only switches such as a gas circuit breaker, but also a disconnector and a grounding switch, as well as transformers such as a current transformer for a meter and a transformer for a meter, are constituted by a grounded container. .

[0004] Separating these devices individually with a grounded container requires a large number of parts and increases the volume and weight. Therefore, the current transformer winding, which is the current detection unit of the current transformer, is required. A configuration in which a gas circuit breaker is disposed in a common grounding container together with a current breaker is often implemented.

Further, the gas circuit breaker often has a structure in which three phases are accommodated in one sealed grounded container or a structure in which each phase is housed in a separate sealed grounded container according to individual specifications and applications. .

FIG. 1 shows an example of the configuration of such a conventional gas circuit breaker.
See Figure 13. However, FIG. 13 shows a three-phase batch type gas circuit breaker. For convenience, only one phase is shown in the arc extinguishing chamber 4, and the other two phases not shown have the same structure.

As shown in FIG. 13, a gas circuit breaker 1 comprises a grounding container 2 having outlets 2a, 2b, 2c, conductors 3a, 3b connected to the outside via these outlets, and arc-extinguishing. It comprises a chamber 4.

The arc-extinguishing chamber 4 of the current interrupting section is fixed to the grounded container 2 by an arc-extinguishing chamber supporting insulator 5. The movable part 4a and the fixed part 4c of the arc-extinguishing chamber are connected by an inter-electrode insulating cylinder 4b, and are mutually insulated. The U-shaped return conductor 3b drawn from the arc-extinguishing chamber 4 penetrates the current transformer 6, and is supported and fixed to the grounded container 2 and the arc-extinguishing chamber 4 by a conductor supporting insulator 7. An operation box 8 for opening and closing is connected to one end of the grounding container 2.

[0009]

The conventional gas circuit breaker having the above configuration has the following problems to be solved.

First, the arc-extinguishing chamber 4 must be fixed by a supporting insulator 5. Therefore, the number of insulators such as the support insulator 5 and the number of parts such as fastening articles, which are not necessary in terms of the current-carrying performance, increase, and the number of assembly operations increases, which is not preferable from the viewpoint of quality assurance. Also, in the three-phase batch type gas circuit breaker, since the inter-electrode insulating cylinder 4b is required for each phase, the number of insulating parts in the same grounded container 2 increases, which is not preferable in terms of quality, production control, and cost. . Further, work such as positioning between phases during assembly is troublesome.

In addition, depending on the specifications and use of the equipment,
When the entire length of the U-shaped return conductor 3b pulled out from the arc-extinguishing chamber 4 to the outlet 2c is extended, for example, when the conductor 3b is disposed in the same gas section, a large An electromagnetic force will be generated, and a large number of supporting insulators 7 may be required to support the conductor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional gas circuit breaker, and has a small number of parts, has good assembling workability, is highly reliable, and has a simplified production management. Another object of the present invention is to provide a gas circuit breaker that can reduce costs and costs.

[0013]

In order to achieve the above object, a first aspect of the present invention is to provide a multi-phase power supply system in which a plurality of arc-extinguishing chambers for interrupting a multi-phase current are sealed together with an insulating gas in a grounded container. In the phase-integrated gas circuit breaker, the inter-electrode insulating cylinder that defines the arc-extinguishing chamber is an integrated inter-electrode insulating tube integrally formed with multiple phases. Polyphasic is often three-phase.

According to this configuration, the number of insulated parts in the same grounded container is reduced, so that the quality can be improved, and the production control can be facilitated by the reduced number of parts. In addition, if the phase is multi-phase, the correlation position of the arc-extinguishing chamber of each phase is automatically determined at the time of assembling.

[0015] Further, by using a single interphase insulating cylinder for multiple phases, the arc extinguishing chamber for multiple phases can be integrated,
Rigidity is increased and high strength can be obtained as compared with the conventional structure of each phase alone.

According to a second aspect of the present invention, in the gas circuit breaker according to the first aspect, a fixed portion is provided on the integrated inter-electrode insulating cylinder, and is fixed to the fixed portion provided in the grounded container. According to this configuration, since the integrated inter-electrode insulating cylinder defining the arc-extinguishing chamber sandwiched between the arc-extinguishing chamber fixing portion and the arc-extinguishing chamber movable portion is fixed to the grounded container, the arc-extinguishing chamber is supported. Strength can be increased.

According to a third aspect of the present invention, in the gas circuit breaker according to the second aspect, the grounding container is formed of a divided container, and the divided container is fastened with a fixed portion of the integrated inter-electrode insulating tube interposed therebetween. Features.

According to this configuration, the grounding container is divided into two parts to be miniaturized, so that the container can be easily manufactured.
Since the weight of each container can be reduced, the assembling work is also facilitated. Further, the fixing of the inter-electrode insulating cylinder can be strengthened.

According to a fourth aspect of the present invention, in the gas circuit breaker according to the third aspect, a power detection unit for electrical monitoring and measurement is provided at a fixed portion of the integrated inter-pole insulating cylinder. According to this configuration, an electric monitoring function of the integrated inter-electrode insulating cylinder and the gas circuit breaker is added, so that the inter-electrode insulating cylinder and the gas circuit breaker can be constantly monitored during energization and switching. .

According to a fifth aspect of the present invention, in the gas circuit breaker according to the second aspect, a conductor of each phase drawn out in a U-shape from the arc-extinguishing chamber of each phase is fixed to the integrated inter-pole insulating cylinder. A conductor fixing portion is provided.

According to this configuration, it is possible to support and fix the U-shaped return conductor, which is lengthened depending on the specification and application, and to protect the conductor from electromagnetic force generated when electricity is supplied or an overcurrent flows. Becomes possible, and it becomes unnecessary to newly increase the supporting insulator.

According to a sixth aspect of the present invention, in the gas circuit breaker according to the second aspect, the conductor of each phase is composed of a divided conductor, and the divided conductors are connected at a conductor fixing portion on the integrated inter-pole insulating cylinder. It is characterized by the following. According to this configuration, the U-shaped return conductor having a complicated shape has a simple shape, so that it is easy to handle at the time of work.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a gas circuit breaker according to an embodiment of the present invention will be described with reference to the drawings. The same parts as those in the conventional technique shown in FIG.

FIGS. 1, 2 and 3 are views showing gas circuit breakers 1 according to different embodiments of the present invention.
FIG. 1 shows a gas circuit breaker 1 in which an integrated inter-electrode insulating cylinder 4 d shown in FIGS. 4 to 8 is fixed by a fixing portion 2 d provided in a grounded container 2.
It is. FIGS. 2 and 3 show the gas circuit breaker 1 in which the integrated inter-electrode insulating cylinder 4d shown in FIGS. 10 to 12 is fixed by two divided grounding vessels 2e and 2f.

The gas circuit breaker according to the first embodiment of the present invention will be described below. As shown in FIG. 1, in a gas circuit breaker 1, an arc-extinguishing chamber 4 for interrupting an electric current is provided in a grounding container 2 in which an insulating gas such as SF ₆ gas is sealed. The conductor 2a enters through the opening 2a and passes through the arc-extinguishing chamber 4 and the U-shaped return conductor 3b.
Out of the outlets 2b and 2c of.

The arc-extinguishing chamber 4 is defined by an integrated three-phase inter-electrode insulating cylinder 4d which connects the arc-extinguishing chamber movable section 4a and the arc-extinguishing chamber fixing section 4c connected to the conductors 3a and 3b. Has been established.

The fixing of the integral inter-electrode insulating tube 4d to the grounding container 2 is performed by fastening the fixing portion 4d1 of the integral inter-electrode insulating tube 4d to the fixing portion 2d provided inside the grounding container 2. The U-shaped return conductor 3b drawn from the arc-extinguishing chamber 4 penetrates the current transformer 6, and is fixed by a conductor fixing portion 4d2 provided in the integral inter-pole insulating cylinder 4d. FIGS. 4 to 8 show an example of an integrated inter-electrode insulating cylinder 4d provided in the gas circuit breaker according to the first embodiment.

FIG. 4 shows a three-phase inter-electrode insulating cylinder 4b formed by integral molding of an epoxy resin or the like, a coupling portion 4d4 formed between the insulating cylinders 4b, and an outer portion of the center of each insulating cylinder 4b. The fixing portion 4d1 is formed toward the side.

FIG. 5 shows that the fixing portion 4d1 is formed at one end of the insulating cylinder 4b. The number of the fixing portions 4d1 is stable at three places. FIG. 6 shows two fixed portions 4d1 formed at both ends of the insulating cylinder 4b. Since it is at both ends, sufficient strength can be obtained at each of two locations.

FIG. 7 is a diagram in which the number of the fixing portions 4d1 in FIG. 6 is reduced. In FIG. 8, the connecting portion 4d4 or the fixing portion 4d1 is expanded at one end of each insulating tube 4b to form a conductor fixing portion 4d2 having a hole through which the U-shaped return conductor 3b passes.

FIG. 9 shows a form in which the inter-electrode insulating cylinders 4b for three phases are connected by the connecting portion 4d4, and does not have the fixing portion 4d1 as in the above-mentioned respective embodiments, so that the gas shutoff shown in FIG. Although it cannot be mounted on a vessel, the rigidity of the arc-extinguishing chamber and its surroundings can be improved by combining the three phases.

Next, a gas circuit breaker according to a second embodiment shown in FIG. 2 will be described. The grounding container 2 of the gas circuit breaker 1 shown in FIG. 2 has a configuration in which two divided grounding containers 2e and 2f are connected in the axial direction. Between the two divided ground containers 2e and 2f,
The fixed portion 4d1 of the integral inter-electrode insulating cylinder 4d to be engaged with the joint of the divided grounding vessels 2e and 2f is sandwiched and hermetically sealed.

Further, the fixing portion 4d of the integral inter-electrode insulating cylinder 4d
1 is provided with a power detection unit 4d1a for electrical monitoring and measurement. Other configurations are the same as those of the gas circuit breaker of the first embodiment shown in FIG. FIGS. 10 and 11 show an example of an integrated inter-electrode insulating cylinder 4d provided in the gas circuit breaker of this embodiment.

FIG. 10 shows a structure in which a coupling portion 4d4 is formed between the three-phase inter-electrode insulating cylinders 4b, and an annular fixing portion 4d1 is formed on the outer periphery of the coupling hole 4d5 while leaving the conductor hole 4d5. Figure
Reference numeral 11 denotes a conductor fixing portion 4d2 for separating and fixing each phase, instead of the fan-shaped conductor hole 4d5 in FIG.

Next, in the gas circuit breaker according to the third embodiment shown in FIG. 3, a conductor connection portion 4d3 is provided at a fixed portion 4d1 of an integrated inter-pole insulating cylinder 4d, and is drawn out from the arc-extinguishing chamber 4. The U-shaped return conductor 3b is divided into two, and the divided conductors 3b1,
b2. Other configurations are the same as those of the second embodiment shown in FIG.

As shown in FIG. 12, an integrated inter-electrode insulating cylinder 4d provided in the gas circuit breaker of this embodiment has a three-phase disc-shaped connecting portion 4d4 for connecting the three-phase inter-electrode insulating cylinder 4b. In this embodiment, a conductor connecting portion 4d3 is provided.

According to the gas circuit breaker of each embodiment of the present invention having the above-described configuration, the following effects can be obtained. First, since the pole insulating cylinder 4b is integrated in three phases, the arc extinguishing chamber 4 for three phases can be made one, and the strength of the entire arc extinguishing chamber 4 can be increased.

Further, since the fixing portion 4d1 provided on the integral inter-electrode insulating cylinder 4d and the fixing portion 2d provided on the grounding container 2 are fastened, the strength of the integrated arc extinguishing chamber 4 can be further increased. The arc-extinguishing-chamber supporting insulators 5 as shown in FIG. 13 and the articles for fastening them, which are conventionally used, can be omitted.

Then, as shown in FIGS. 2 and 3, the fixed portion 4d1 of the integral inter-electrode insulating cylinder 4d is provided with a power monitoring section 4d1a for electrical monitoring and measurement, so that the integrated inter-electrode insulating cylinder 4d is provided. It is possible to constantly monitor the corona level or the like of the gas circuit breaker itself or the like, thereby improving reliability.

Further, since the conductor fixing portion 4d2 or the conductor connection portion 4d3 for fixing the U-shaped return conductor 3b to the integral inter-electrode insulating tube 4d is provided, the support strength of the U-shaped return conductor 3b is increased. It is possible to obtain a support structure that can withstand the electromagnetic force generated at the time of energization. Accordingly, it is not necessary to newly provide a support insulator for supporting the conductor, and the number of insulators can be reduced.

The present invention is not limited to the above embodiment, and various other embodiments are possible. For example, a single gas circuit breaker or a multi-phase gas circuit breaker can obtain the same effects as those of the above embodiments. In addition, each of the above embodiments can be freely selected according to the use and necessity of the gas circuit breaker.

[0042]

As described above, the gas circuit breaker of the present invention is provided with a three-phase integral type inter-electrode insulating cylinder, and if necessary, a fixing part to the grounding container, a power detection part, and a conductor fixing part. With the configuration provided with the parts, the number of parts of the gas circuit breaker can be reduced, the monitoring function can be strengthened, the assembly work can be simplified, the production management can be improved, the reliability can be improved, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a gas circuit breaker according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a gas circuit breaker according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a gas circuit breaker according to a third embodiment of the present invention.

FIG. 4 is a perspective view showing a first example of an integrated inter-pole insulating cylinder provided in the gas circuit breaker according to the first embodiment of the present invention.

FIG. 5 is a perspective view showing a second example of the integrated inter-pole insulating cylinder provided in the gas circuit breaker according to the first embodiment of the present invention.

FIG. 6 is a perspective view showing a third example of an integrated inter-pole insulating cylinder provided in the gas circuit breaker according to the first embodiment of the present invention.

FIG. 7 is a perspective view showing a fourth example of the integrated inter-pole insulating cylinder provided in the gas circuit breaker according to the first embodiment of the present invention.

FIG. 8 is a perspective view showing a fifth example of the integrated inter-pole insulating cylinder provided in the gas circuit breaker according to the first embodiment of the present invention.

FIG. 9 is a perspective view showing a sixth example of the integrated inter-pole insulating cylinder provided in the gas circuit breaker according to the first embodiment of the present invention.

10A and 10B show a first example of an integrated inter-pole insulating cylinder provided in the gas circuit breaker according to the second embodiment of the present invention, wherein FIG. 10A is a perspective view and FIG. 10B is a side view.

FIG. 11 is a perspective view showing a second example of the integrated inter-pole insulating cylinder provided in the gas circuit breaker according to the second embodiment of the present invention.

FIG. 12 is a perspective view showing an integrated inter-pole insulating cylinder provided in a gas circuit breaker according to a third embodiment of the present invention.

FIG. 13 is a sectional view showing a conventional gas circuit breaker.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gas circuit breaker, 2 ... Ground container, 2a, 2b, 2c ... Outlet, 2d ... Ground container side pole insulating cylinder fixing part, 2e, 2
f: divided ground vessel, 3a: conductor, 3b: U-shaped return conductor, 3b1, 3b2: divided conductor, 4: arc extinguishing chamber, 4a: arc extinguishing chamber movable part, 4b: inter-electrode insulating cylinder, 4c: extinguishing Arc chamber fixing part,
4d: integrated inter-electrode insulating cylinder, 4d1: inter-electrode insulating cylinder side fixing portion, 4d1a: power detection portion, 4d2 ... conductor fixing portion, 4d3 ... conductor connecting portion, 4d4 ... coupling portion, 4d5 ... conductor hole, 5 ... Arc chamber support insulator, 6 ... current transformer, 7 ... conductor support insulator, 8 ...
Operation box.

Claims (6)

[Claims] 1. A multi-phase integrated gas circuit breaker in which a plurality of arc-extinguishing chambers for interrupting a multi-phase current are sealed together with an insulating gas in a grounded container, and a gap between the arcs defining the arc-extinguishing chamber is provided. A gas circuit breaker characterized in that the insulating cylinder is an integrated inter-pole insulating cylinder formed integrally with the polyphase. 2. The gas circuit breaker according to claim 1, wherein the integral inter-electrode insulating cylinder has a fixing portion mounted in a grounded container. 3. The gas circuit breaker according to claim 2, wherein the grounded container is composed of a divided container, and the divided container is fastened with a fixed portion of the integral inter-electrode insulating cylinder interposed therebetween. 4. The gas circuit breaker according to claim 3, wherein a power detection unit for electrical monitoring and measurement is provided on a fixed portion of the integral inter-electrode insulating cylinder. 5. A conductor fixing portion for fixing a conductor of each phase drawn out in a U-shape from an arc-extinguishing chamber of each phase is provided in the integral inter-electrode insulating cylinder. Gas circuit breaker. 6. The gas circuit breaker according to claim 5, wherein the conductors of each phase are composed of divided conductors, and the divided conductors are connected at conductor fixing portions on the integral inter-pole insulating cylinder.