JPH0618098B2 - Three-phase buffer circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an improvement of a three-phase puffer type circuit breaker in which a three-phase circuit breaker is housed in one tank.

[Technical Background of the Invention] In recent years, the performance of puffer type gas circuit breakers has been remarkably improved, and those having the same rating as the conventional ones are becoming smaller and the operating force is becoming smaller. In addition, substations near urban areas are required to be downsized due to factors such as rising land prices. Under these circumstances, a three-phase, one-tank puffer-type circuit breaker in which the three-phase circuit breakers are housed in one tank has been put into practical use, and this has helped to reduce the size of the gas-insulated substation.

Conventionally, an example of this type of three-phase puffer type circuit breaker is configured as shown in FIGS. 3 and 4. This is because the shutoff portions 2R, 2S, 2T of each phase are accommodated and arranged in the metal tank 1 with a space therebetween, and these are fixed side members 4R, 4S, 4T and movable side members 6R, 6S, It is composed of 6T. Each of the fixed side members 4R, 4S, 4T is composed of a fixed contactor 3 integrally formed on the support 7 and a fixed arc contactor 8 provided at the center of the inside thereof. The movable side members 6R, 6S, 6T are respectively a puffer piston 13 provided on the inner circumference of the puffer cylinder 12, an operation rod 18 fixed to an insulating rod 19 slidably provided at the inner center thereof, The movable contactor 11 is provided at the tip of the operation rod 18. In the figure, 5R, 5S, and 5T are inter-electrode insulating cylinders,
9R, 9S and 9T are connection conductors, 10 is an insulating spacer, 1
4 is an insulating cylinder, 15 is a current collecting conductor, 16R, 16S, 16T
Is a connecting conductor, 17 is an insulating spacer, 20 is an operating mechanism, 2
One operation piston rod and 22 are operation mechanism storage boxes.

The blocking portions 2R, 2S, 2T having such a configuration, that is, the fixed side members 4R, 4S, 4T and the movable side members 6R, 6
S and 6T are fixed side member 4 by cutting off the current.
It is necessary to support the R, 4S, 4T and the movable side members 6R, 6S, 6T with some kind of insulator. Therefore, conventionally, each of the phases is supported by the inter-electrode insulating cylinders 5R, 5S, 5T.

[Problems of background art] However, when supported by the inter-electrode insulating cylinders 5R, 5S, 5T, the outer diameters of the blocking portions 2R, 2S, 2T become large, and in order to prevent interphase and earth-to-ground insulation breakdown, interphase and metal If the distance between the tanks 1 is increased, the diameter of the metal tank 1 is increased and the size cannot be reduced. Further, the fixed side members 4R, 4
If the inter-electrode insulating cylinders 5R, 5S, 5T that surround the S, 4T and the movable side members 6R, 6S, 6T are attached, the exhaust at the time of blocking is deteriorated and the blocking performance between the fixed and movable contacts 3, 11 is improved. There is also a drawback that the hot gas generated due to the resistance of the contacts 3 and 11 when energized is hard to escape.

[Object of the Invention] The present invention has been made based on the above circumstances, and does not reduce the breaking performance between contacts, does not cause dielectric breakdown between phases or tanks, and can be downsized as a whole. An object is to provide a three-phase puffer type circuit breaker that can be used.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention supports a fixed-side member and a movable-side member with an interelectrode insulating rod, and uses the interelectrode insulating rod as a shaft in the contacting / separating direction of each breaking portion. It is a three-phase puffer type circuit breaker arranged so as to be located at each vertex of an equilateral triangle surrounding the axis of each breaking portion when cut in a plane orthogonal to each other.

[Examples of the Invention] Examples of the present invention shown in the drawings will be described below. FIG. 1 is a cross-sectional view showing an embodiment of a three-phase puffer type gas circuit breaker according to the present invention, and FIG. 2 is a cross-sectional view showing an arrangement state of fixed side members of FIG.

In the metal tank 1, three-phase shutoff portions 2R, 2S, 2T are housed together with an insulating arc-extinguishing medium such as SF ₆ gas. Since each of the blocking portions 2R, 2S, 2T has the same structure, the blocking portion 2R will be representatively described here.

The fixed contact arc 3 of the breaking portion 2R is provided on the fixed-side member 4R and is fixed to the movable-side member 6R via the inter-electrode insulating rod 23. The fixed arc contactor 8 is provided on the support 7 of the fixed-side member 4R, and the fixed arc contactor 8 is led out from the insulating spacer 10 to the outside of the metal tank 1 through the connecting conductor 9R provided on the support 7.

The movable contactor 11 of the movable-side member 6R has a puffer shape, and forms a puffer device together with the puffer piston 13 that relatively slides in the puffer cylinder 12. The puffer cylinder 12 is supported by a current collecting conductor 15 supported via an insulating cylinder 14 and mounted in the metal tank 1. The current collecting conductor 15 is led out of the tank from the insulating spacer 17 by the connecting conductor 16R. The puffer piston 13 carrying the movable contact 11 is operated by the operation mechanism 2 via the operation rod 18 and the insulating rod 19.
It is connected to the zero operating piston rod 21. These operation mechanisms 20 are collected in an operation mechanism storage box 22 provided on the side of the metal tank 1.

When arranging the fixed side members 4R, 4S, 4T in the metal tank 1, respectively, as shown in FIG. 2, the fixed side members 4R, 4S, 4T are fixed to the vertices of a triangle whose base is a line perpendicular to the drawing direction of the connecting conductor 9R. Although the side members 4R, 4S, 4T are arranged,
Of these, the fixed-side member 4R located at the apex is arranged farthest from the insulating spacer 10 which is the outlet of the connection conductor 9R. Fixed side members 4R, 4S for each phase
4T is a movable side member 6R, 6 via the inter-electrode insulating rod 23.
The inter-electrode insulating rods 23 are supported by S and 6T, avoid the shortest distance between the phases where the electric field is concentrated and between the metal tanks 1, and the apexes of the triangles are arranged in the axial direction of the metal tank 1. .

As described above, according to the embodiment of the present invention, the following effects can be obtained.

1. Fixed side members 4R, 4S, 4T and movable side members 6R, 6
Since S and 6T are supported by the inter-electrode insulating rods 23, and the inter-electrode insulating rods 23 are arranged at three points for avoiding the interphase and the metal tank (ground) 1 near each other, The dielectric strength performance is increased without increasing the diameter.

2. Unlike the conventional case, the fixed-side members 4R, 4S, 4T and the movable-side members 6R, 6S, 6T are supported by the inter-electrode insulating rods 23 without attaching the inter-electrode insulating cylinders. Exhaust gas does not deteriorate and the breaking performance between the contacts 3 and 11 is not lowered.

3. Fixed side members 4R, 4S, 4T and movable side members 6R, 6
Since the heat generating portion due to the contact resistance of S and 6T can convection with the surrounding insulating gas, the contact temperature of the contacts 3 and 11 is cooled.

4. Fixed side members 4R, 4S, 4T and movable side members 6R, 6
Since the centering condition of the S and 6T contacts 3 and 11 can be easily seen, the assembly becomes easy.

5. By supporting the inter-electrode insulating rod 23 at three points, the breaking portions 2R, 2S, 2T of each phase can be made common, there is no need to increase the number of types of parts, the productivity accompanying standardization is improved, and the product quality is improved. Is stable.

[Advantages of the Invention] According to the present invention described above, the fixed-side member and the movable-side member are supported by the inter-electrode insulating rods, and the inter-electrode insulating rods are arranged on a plane orthogonal to the axis in the contact / separation direction of each breaking portion. When cut, it was placed so as to be located at each vertex of an equilateral triangle that surrounds the axis of each breaking part, so the breaking performance between contacts is not reduced, and there is no dielectric breakdown between phases or tanks, It is possible to provide a three-phase puffer type circuit breaker that can be downsized as a whole.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a three-phase puffer type circuit breaker according to the present invention, FIG. 2 is a sectional view showing an arrangement state of fixed side members of FIG. 1, and FIG. 3 is a conventional three-phase. FIG. 4 is a cross-sectional view showing one embodiment of the puffer type circuit breaker, and FIG. 4 is a cross-sectional view showing the arrangement of the fixed-side members shown in FIG. 1 ... Metal tank, 2R, 2S, 2T ... Breaking part, 3
...... Fixed contacts, 4R, 4S, 4T ...... Fixed side members, 5
... Inter-electrode insulating tube, 6R, 6S, 6T ... movable member, 7
…… Support, 8 …… Fixed arc contactor, 9R, 9S, 9T
...... Connecting conductor, 10 ...... Insulating spacer, 11 ...... Movable part contactor, 12 ...... Puffer cylinder, 13 ...... Puffer piston, 14 ...... Insulation cylinder, 15 ...... Current collecting conductor, 16
R, 16S, 16T ... connecting conductor, 17 ... insulating spacer, 18 ... operating rod, 19 ... insulating rod, 20 ...
… Operating mechanism, 21 …… Operating piston rod, 22 …… Operating mechanism housing box, 23 …… Insulator gap.

Claims (1)

[Claims] 1. A breaker having a stationary side member and a movable side member for three phases in a tank containing an insulating arc-extinguishing medium, and a contactor of the breaker contacts and separates in a direction substantially parallel to the longitudinal axis of the tank. In the three-phase puffer type circuit breaker, in which the breaking portions of the respective phases are substantially parallel to each other and the movable axes are provided at the respective vertices of a triangle on a plane perpendicular to the tank longitudinal axis, The fixed-side member and the movable-side member of each of the cutoff portions are supported by three inter-electrode insulating rods arranged around the movable shaft of each of the cutoff portions and substantially parallel to the movable shaft, and each of the cutoff portions is supported. The three pole-to-pole insulating rods of the part are arranged at the positions of the vertices of an equilateral triangle whose center is the movable axis and whose two vertices are equidistant to the tank in a cross section orthogonal to the tank longitudinal axis. Three-phase puffer type circuit breaker.