JP2002231112A - Circuit breaker unit, and insulating support frame for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circuit breaker unit allowing suppression of heat generation from a circuit breaker by simplifying a structure of an insulating support frame for supporting the three-phase circuit breaker. SOLUTION: Integrally molded insulating support frames F1 to F3 having a structure that is surrounded with a plate-like wall part, has a breaking part storing space A and an operating part storing space B that open at both ends, and partitions the breaking part storing space A and the operating part storing space B with a partition 35 are used, and the breaking part storing space A and the operating part storing space B of each support frame store a breaking part 3 and an operating part 6, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker unit having a structure in which a three-phase power circuit breaker such as a vacuum circuit breaker is supported on an insulating support frame, and an insulating support frame used for the circuit breaker unit. is there.

[0002]

2. Description of the Related Art When a circuit breaker such as a vacuum circuit breaker is arranged in a switch such as a gas insulated switch, a three-phase circuit breaker is supported on an insulating support frame, and the insulating support frame is connected to the switch. Mounting on a mounting plate fixed to a case is performed.

FIGS. 13 to 15 show a main part of a conventional gas insulated switchgear using a vacuum circuit breaker. In this example, a first plate is attached to a mounting plate 1 fixed to a case of the gas insulated switchgear. Or a circuit breaker unit 2 having third-phase circuit breakers CB1 to CB3. 13 and 14
In the space S1 of the left mounting plate 1 is a space inside the case of gas-insulated switchgear device, in the space SF ₆
Gas is sealed at a predetermined pressure. A space S2 on the right side of the mounting plate 1 is a space (atmosphere) in a control panel (operator box) mounted on a side surface of a case of the gas insulated switchgear.

The circuit breaker of each phase includes a fixed contact 3a and a linearly displaceable movable contact 3b which comes into contact with and separates from the fixed contact 3a.
The fixed electrode 3d and the linearly displaceable movable electrode rod 3e respectively connected to the fixed contact and the movable contact are accommodated in a container 3c whose inside is kept in a vacuum, and one end and the other end in the axial direction of the container 3c, respectively. Blocking part 3 led out from the outside
And the main circuit conductor 4 connected to the fixed electrode 3d of the interrupting section 3.
And a mounting table 5 having a sliding contact 5a for slidingly contacting the movable electrode rod 3e of the blocking unit 3 and supporting the movable electrode rod 3e via the sliding contact, and operating the movable electrode rod 3e. And an operation section 6 having an insulating operation rod 6a for transmitting a force.

In this type of linear operation type circuit breaker, a fixed contact 3a, a movable contact 3b, a fixed electrode 3d, and a movable electrode 3e are arranged with their respective axes coincident with each other. 3e is operated in its axial direction. In the present specification, the above-mentioned axis is referred to as the axis of the blocking unit.

In this type of conventional circuit breaker unit, four insulating support rods 7 are provided in parallel at four corners of a square, and one end of each of these insulating support rods 7 is provided. Are screwed into screw holes provided in the mounting plate 1. Four insulating support rods 7
A mounting table 5 is arranged on the other end side of the
Are screwed into female screw portions provided on the shaft cores at the other ends of the four insulating support rods 7 through holes provided in the mounting base 5 respectively. Thereby, the insulating support rod 8 is coupled to the insulating support rod 7 and the mounting base 5 is fixed to the mounting plate 1.

[0007] As described above, the mounting table 5 is attached to the mounting plate 1.
After being fixed to the fixed electrode 3d, the interrupting section 3 in which the main circuit conductor 4 is previously attached to the fixed electrode 3d by the bolt 9 is disposed between the four insulating support rods 8, and the movable electrode rod 3e is slid on the mounting base 5. The moving contact 5a is brought into contact with the moving contact 5a. Then, the main circuit conductor 4 is fastened to the insulating support rod 8 by the bolt 10, and the cutoff portion 3 is supported on the mounting plate 1 via the mounting base 5 and the insulating support rods 7 and 8.

An insulating operating rod 6a is arranged between the four insulating supporting rods 7, and one end of the insulating operating rod is connected to a movable electrode rod 3e penetrating through the mounting base 5, and an operating rod 11 made of metal is provided. Is connected to the other end of the insulating operating rod 6a through a hole 1a provided in the mounting base 1. A bellows 6b is attached to the other end of the insulated operating rod 6a, and a flange provided at the tip of the bellows is fixed to the mounting plate 1 via an O-ring 13. The bellows 6b and the O-ring 13 The airtightness of the through portion of the rod 11 is maintained.

Each operating rod 11 has a spring receiving plate 15 and 1
6 are slidably fitted, and both spring receiving plates 15 and 16
A contact pressure spring 17 is provided between the two. A connection fitting 18 is slidably fitted to the distal end of each operating rod 11, and a nut 1 for preventing the spring receiving plate 16 and the connecting fitting 18 from coming off is fitted to a thread provided at the distal end of each operating rod 11.
9 is screwed.

One of the two spring receiving plates 15 and 16 disposed on the mounting plate 1 side abuts on a step provided on the operating rod 11 and moves toward the mounting plate 1 side. Is restricted, and the other spring receiving plate 16 is
The nut 8 is brought into contact with the nut 19 through 8 so that its displacement is regulated.

An operation shaft 21 is mounted on a surface of the mounting plate 1 on the control panel side (a surface on the right side in FIG.
Are rotatably supported, and three operation levers 22 respectively corresponding to the three-phase operation rods 11 are attached to the operation shaft 21. Each operation lever 22 is composed of two plate-like lever components arranged in parallel, and the distal end of each operation lever 22 and the connection fitting 18 provided at the distal end of the corresponding operation rod 11 are connected. They are connected by pins 23.

In order to insulate between the main circuit conductors 4 of the circuit breakers of adjacent phases and between the mounting bases 5 and to insulate between the main circuit conductors 4 and the mounting bases 5 of the circuit breakers at both ends and ground, An insulating barrier 24 made of an insulating plate is provided between the devices CB1 to CB3 and at one end and the other end in the direction in which these circuit breakers are arranged.

The operating shaft 21 is connected to an output shaft of a breaker operating device 25 via a connecting mechanism (not shown).
5, the operation shaft 21 is reciprocally rotated by a predetermined angle, and the three-phase circuit breakers are collectively opened and closed.

In the illustrated circuit breaker unit, conductors can be connected to the main circuit conductors 4 and the mounting bases 5 of the circuit breakers of each phase, and the main circuit conductors 4 and 4 are connected via these conductors. The mounting base 5 is connected to other components constituting the switchgear.

In FIG. 14, an operating shaft 21 is an operating device 25.
When driven in the counterclockwise direction, the operation lever 22 rotates counterclockwise to displace the connection fitting 18 and the spring receiving plate 16 toward the mounting plate 1. This displacement is caused by the contact pressure spring 17.
The operating rod 11 is displaced to the blocking unit 3 side together with the insulating operating rod 6a and the movable electrode rod 3e, and the movable contact 3b of the blocking unit 3 contacts the fixed contact 3a. The shut-off unit 3 is turned on. A contact pressure between the movable contact 3b and the fixed contact 3a is given by the biasing force of the compressed contact pressure spring 17.

In FIG. 14, when the operating shaft 21 is driven clockwise, the operating lever 22 rotates clockwise to displace the operating rod 11 and the insulating operating shaft 6a to the side opposite to the blocking portion. As a result, the movable contact 3b is separated from the fixed contact 3a, and the blocking unit 3 is turned off.

[0017]

In the conventional circuit breaker unit, the circuit breaker is supported using eight insulating support rods corresponding to one unit, so that the number of parts is increased and the man-hour required for assembly is increased. I could not avoid becoming.

In the conventional circuit breaker unit, when three-phase circuit breakers are arranged close to each other, it is necessary to provide an insulating barrier between the phases and between both ends and the ground. In combination with the increase in cost, it was inevitable that the cost would increase.

Further, the conventional circuit breaker unit has a structure in which parts are sequentially assembled on a mounting plate for mounting the unit to assemble the circuit breaker. Therefore, the circuit breaker unit is mounted on the mounting plate, and then the mounting plate is mounted on the case of the switchgear. It has to be mounted, and there is a problem that workability at the time of assembling the switchgear deteriorates. Since the mounting plate is a heavy component, it is preferable to mount the mounting plate on the case of the switchgear before mounting the circuit breaker unit in order to improve the assembling work of the switchgear. Preferably, the circuit breaker can be assembled without a mounting plate.

When the circuit breaker unit is housed in the case of the gas insulated switchgear, the gas flow around the breaker is improved and cooling of the breaker is improved in order to prevent the temperature of the breaker from rising. It is preferable to be able to do so.

An object of the present invention is to provide a circuit breaker unit capable of reducing the number of parts and reducing the number of assembling steps, and an insulating support frame used for the circuit breaker unit.

It is another object of the present invention to provide a circuit breaker unit capable of assembling a circuit breaker without a mounting plate, and an insulating support frame used for the circuit breaker unit.

Still another object of the present invention is to provide a circuit breaker unit capable of suppressing a rise in the temperature of a circuit breaker, and an insulating support frame used for the circuit breaker unit.

[0024]

According to the present invention, a fixed contact and a linearly displaceable movable contact which comes into contact with and separate from the fixed contact are accommodated in a container and connected to the fixed contact and the movable contact, respectively. A fixed part and a linearly displaceable movable electrode rod, which are led out from one end and the other end in the axial direction of the container, a main circuit conductor connected to the fixed electrode of the cut part, A mounting base having a sliding contact for slidingly contacting the movable electrode rod of the section and supporting the movable electrode rod via the sliding contact; and an insulating operating rod for transmitting an operating force to the movable electrode rod. It is intended for a circuit breaker unit having a configuration in which a circuit breaker having an operation unit is mounted on an insulating support frame.

In the present invention, the insulating support frame includes a cut-off portion housing space and an operation portion housing space which are surrounded by a plate-like wall and open at both ends. Use is made of a synthetic resin molded product having a structure in which the spaces between the storage spaces are separated by partition walls. Then, the breaking portion and the main circuit conductor of the circuit breaker are housed in the breaking portion housing space of the insulating support frame, and the main circuit conductor is fixed to the wall portion facing the partition, and the movable electrode rod is passed through the partition. Into the operation unit housing space. Further, the operating part and the mounting base of the circuit breaker are accommodated in the operating part housing space of the insulating support frame, and the mounting base is fixed to the partition.

In a preferred embodiment of the present invention, the insulating support frame has a pair of side walls arranged in parallel with each other, and a pair of end walls opposed to each other in a direction perpendicular to a direction in which the pair of side walls face each other. A molded product of a synthetic resin integrally having a partition provided so as to divide a space surrounded by the pair of side walls and the pair of end walls into two in a direction opposite to the pair of end walls, Both ends in a direction perpendicular to both the opposing direction of the pair of side walls and the opposing direction of the pair of end walls are between one end wall and the partition wall and between the other end wall and the partition wall. An open blocking section housing space and an operation section housing space are formed.

When using such an insulating support frame,
The circuit breaker and the main circuit conductor are housed in the breaker housing space, the main circuit conductor is fixed to one end wall, and the movable electrode of the circuit breaker is operated by penetrating the partition of the insulating support frame. It is introduced into the department accommodation space. Further, the mounting base and the operating part of the circuit breaker of each phase are accommodated in the operating part accommodating space of the insulating support frame of each phase, and the mounting base is fixed to the partition of the insulating support frame of each phase,
An operation rod for connecting the operation unit of the circuit breaker to the operation device is connected to the operation unit by penetrating the other end wall of the insulating support frame.

As described above, when the insulating portion and the operating portion are supported by the insulating support frame made of an integrally molded product, when each of the portions of the circuit breaker is supported by combining a large number of insulating supporting rods as in the related art. In comparison, the number of parts can be reduced and the number of assembling steps can be reduced, so that the cost can be reduced.

Further, as described above, the insulating support frame is provided with the cut-off portion housing space and the operation portion housing space having both ends opened, and the cut-off portion and the operation portion of the circuit breaker are housed in these housing spaces, respectively. Since the gas can be always circulated through the two storage spaces, the cooling of the shutoff portion can be effectively achieved, and the temperature rise can be suppressed.

Further, as described above, if the structure is such that both ends of the cut-off portion accommodating space and the operation portion accommodating space provided in the insulating support frame are opened, the space between the main circuit conductor and the mounting stand and other devices is provided. Since the conductor to be connected can be drawn out from either opening side of the cut-off section accommodating space and the operation section accommodating space, flexibility in the arrangement of the main circuit conductor and the conductor for connecting the mounting base to other equipment is provided. You can have
The design margin of the switchgear can be increased.

Further, with the above-described structure, the side walls of the insulating support frame function as insulating barriers for insulating between the phases and between the both-end phases and the ground, so that the inter-phase and the both-end phases and the ground are not provided separately. The insulation between them is strengthened, so that the circuit breaker unit can be made compact.

The insulating support frame can be divided into a first frame portion and a second frame portion disposed on both sides of the divided surface, with a plane including the axis of the blocking portion as a divided surface. In this case, the first and second frame portions are interconnected via the main circuit conductor and the mount.

In this case, the dividing direction of the insulating support frame may be a direction perpendicular to the opposing direction of the pair of side walls, or a direction parallel to the opposing direction of the pair of side walls.

As described above, if the insulating support frame is divided into the first frame portion and the second frame portion, the cut-off portion and the operation portion are attached to one frame portion, and then the other frame portion is attached. Can be assembled, so that the assembling work in each of the housing spaces can be facilitated when the shut-off portion housing space and the operation portion housing space are deep. In addition, the circuit breaker can be assembled from one direction without reversing the direction of the insulating frame, and when connecting the operating rod to the insulating operating rod by penetrating the end wall on the operation unit housing space side. Since there is no need to perform the operation of inserting the operating rod into the hole having a small diameter, it is possible to easily assemble the circuit breaker.

In the case where the circuit breakers are provided for three phases and the three-phase circuit breakers are arranged in a state where their axes are parallel to each other, three insulating support frames are provided and one insulating support frame is provided. What is necessary is just to support the phase breaker.

When a three-phase circuit breaker is provided, a common insulating support frame for the three phases configured as described below is used.
The structure can be further simplified.

That is, when supporting three-phase circuit breakers arranged with their axes parallel to each other, a pair of side walls arranged in parallel with each other and a direction perpendicular to the opposing direction of the pair of side walls are provided. The space defined by the pair of end walls facing each other, and the space surrounded by the pair of side walls and the pair of end walls is divided into three equal parts in the direction in which the pair of side walls face each other, and is arranged in the direction in which the pair of side walls face each other. Two partition walls provided so as to form a three-phase circuit breaker accommodating space, and the first to third phase circuit breaker accommodating spaces are provided so as to divide each of the two end walls in a direction opposite to the pair of end walls. First to third
A first partition wall, a first partition wall, a first partition wall, a first partition wall, a first partition wall, and a first partition wall. It is preferable to use one having first- to third-phase operation unit accommodation spaces, both ends of which are opened, between the first to third-phase partition walls and the other end wall.

In the case where the above-mentioned insulating support frame is used, the cut-off portion of each phase breaker and the main circuit conductor are accommodated in the cut-off portion accommodating space of each phase of the insulating support frame. The main circuit conductor is fixed to one end wall, and the movable electrode rod of the blocking part of each phase is introduced into the operation part accommodating space of each phase through the partition wall of each phase. In addition, the mounting base and the operating part of the circuit breaker of each phase are accommodated in the operating part accommodating space of each phase of the insulating support frame, and the mounting base is fixed to the partition of each phase. Also, an operation rod for connecting the operation unit of the circuit breaker of each phase to the operation device is connected to the operation unit in the operation unit accommodation chamber of each phase by penetrating the other end wall of the insulating support frame.

When the three-phase circuit breaker is supported by the common insulating support frame as described above, the number of parts and the number of assembling steps can be reduced, and the cost can be reduced.

When the insulating support frame is constructed as described above, the insulating support frame can be divided into a first frame portion and a second frame portion to facilitate assembly. In this case, the insulating support frame is divided into a first frame portion and a second frame portion using a plane including the axis of the three-phase blocking portion as a division surface.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below, taking as an example the case where a vacuum circuit breaker is used as a circuit breaker.

FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a plan view, and FIG.
3 is a left side view.

In these figures, reference numeral 1 denotes a mounting plate mounted on one side of a case of a gas insulated switchgear. A box is disposed outside the mounting plate 1 and an operating device of a circuit breaker and a monitor are provided in the box. A control panel is configured by housing the devices.

[0044] In FIGS. 1 and 2, the space S1 of the left mounting plate 1 is a space inside the case of a gas insulated switchgear, SF ₆ gas is sealed at a predetermined pressure in the space S1. A space S2 on the right side of the mounting plate 1 is a space (atmosphere) in a control panel (operating box).

In this example, first to third phase breakers C
B1 to CB3 and first to third phase insulating support frames F1 to F3 for supporting these circuit breakers are provided, and a circuit breaker unit is constituted by the circuit breakers of each phase and the insulating support frame. . That is, a circuit breaker unit is formed for each of the three phases, and the circuit breaker units U1 to U1 for the first to third phases are formed.
3 are mounted on the mounting plate 1 side by side.

Each of the circuit breakers CB1 to CB3 of each phase comprises a breaking section 3, a main circuit conductor 4, a mounting base 5, and an operating section 6, as in the conventional example shown in FIGS. I have. The illustrated cut-off section 3 accommodates a fixed contact 3a and a linearly displaceable movable contact 3b which comes into contact with and separates from the fixed contact in a container 3c whose inside is kept in a vacuum, and It has a known structure in which a fixed electrode 3d and a linearly displaceable movable electrode rod 3e respectively connected to the contact are led out from one end and the other end in the axial direction of the container 3c.

The main circuit conductor 4 is a conductor through which the main circuit current flows, and is formed of a rectangular conductive plate. The main circuit conductor is provided with four mounting holes 4a to 4 at predetermined intervals along its longitudinal direction, as shown by a chain line in FIG.
d is formed.

The main circuit conductor 4 may be any one that can be attached to the insulating support frame, and its shape is not limited to the illustrated example.

The mounting table 5 has a function as a conductor for passing the main circuit current and a function as a support for supporting the cutoff section. The mounting table 5 shown in the drawing has a rectangular front profile. It is made of a plate-shaped conductive member formed to exhibit. A movable electrode insertion hole is formed in the mounting base 5 with a part thereof penetrating in the thickness direction, and the movable electrode rod 3e of the blocking unit 3 is slid in the movable electrode insertion hole in a state where the movable electrode rod 3e is penetrated. A sliding contact 5a of a tulip contact type to be brought into contact is provided. The movable electrode rod 3e is slidably supported by being brought into contact with the sliding contact 5a, and is electrically connected to the mounting base 5 via the sliding contact 5a.

Although not shown, the mounting base 5 is provided with a connecting portion for connecting terminal fittings provided on a conductor for connecting to an external circuit.

The first to third phase insulating supporting frames F1 to F3 supporting the first to third phase breakers CB1 to CB3 are formed to have the same shape and the same dimensions. Each insulating support frame includes a pair of side walls 31 and 32 arranged in parallel with each other, a pair of end walls 33 and 34 facing in a direction perpendicular to a direction in which the pair of side walls face each other, and a pair of side walls 31 and 32. An integral molded product of synthetic resin integrally having a partition wall 35 provided so as to divide a space surrounded by 32 and a pair of end walls 33 and 34 into two in a direction facing the pair of end walls 33 and 34. And one end wall 33 and partition wall 3
5 and between the other end wall 34 and the partition wall 35, both ends in the direction perpendicular to both the opposing direction of the pair of side walls 31, 32 and the opposing direction of the pair of end walls are open. A cut-off section housing space A and an operation section housing space B are formed.

In the sectional view of FIG. 2, for convenience, only the mounting plate 1 is shown in cross section, and the end walls 33,
34 and the partition 35 are shown without a cross section.

The partition wall 35 of each insulating support frame is formed with a hole for penetrating the movable electrode rod 3e of the blocking section 3 housed in the blocking section housing space A, and the operation section housing space B
A mounting base fixing portion for fixing the mounting base 5 housed in the housing is provided. A bolt insertion hole for passing a bolt for fixing the mounting table 5 is formed in the mounting table fixing portion.

One end wall 33 of each insulating support frame is provided with a main circuit conductor mounting portion for mounting the main circuit conductor 4 housed in the interrupting portion housing space A, and the other end wall 34 is provided with a main circuit conductor mounting portion. An operation rod through hole 34a (see FIG. 1) for penetrating the operation rod 11 that connects the operation unit 6 accommodated in the operation unit accommodation space to the operation device is provided. The main circuit conductor mounting portion provided on one end wall 33 is provided with mounting holes that match the mounting holes 4a to 4c provided in the main circuit conductor, respectively.

In each of the insulating support frames of the respective phases, the cut-off portion accommodating space A accommodates the cut-off portion 3 of each phase and the main circuit conductor 4 connected to the fixed electrode 3d of the cut-off portion. The electrode rod 3e is inserted into the hole provided in the partition wall 35 of the insulating support frame and the movable electrode insertion hole provided in the mounting base 5, and is brought into sliding contact with the sliding contact 5a. The main circuit conductor 4
A bolt 38 penetrating through the mounting holes 4a and 4c provided in the main circuit conductor and a mounting hole provided in one end wall 33 of the insulating support frame, and a nut 39 screwed to the bolt 38; To the one end wall 33 of the insulating support frame. A mounting hole provided in one end wall 33 of the insulating support frame and a mounting hole 4b provided in the main circuit conductor 4
The main circuit conductor 4 is fastened to the fixed electrode 3d by screwing a bolt 40 passing through the fixed electrode 3d into a screw hole provided in the axis of the fixed electrode 3d.

The operating section 6 and the mounting table 5 are housed in the operating section housing space B, and the mounting table 5 is fixed to the mounting table 5 by bolts 41 which penetrate the partition wall 35 and are screwed into screw holes provided in the mounting table 5. It is fixed to the partition 35. One end of the insulating operating rod 6 a constituting the operating section 6 is connected to the sliding contact 5 of the mounting base 5.
a movable electrode rod 3 introduced into the operation unit accommodation space B through
e.

The first to third phase circuit breaker units U1 to U3 assembled as described above are arranged side by side in the horizontal direction, and the end walls 34 of the respective insulating support frames F1 to F3 are attached to the mounting plate. 1 is fixed by bolts 42. The other end of the insulating operation rod 6a of the circuit breaker of each phase passes through the hole 1a provided on the mounting plate 1 and the operation rod through hole 34a provided on the other end wall 34 of the insulating support frame, and accommodates the operation part. It is connected to one end of the operation rod 11 inserted in the space B. One end of a metal bellows 6b is attached to the other end of the insulated operation rod 6a, and a flange provided at the other end of the bellows 6b has an O-ring 1 inside the operation rod through hole 34a.
3 is hermetically connected to the periphery of the hole 1a of the mounting plate 1. The bellows 6 b and the O-ring 13 maintain the airtightness of the penetrating portion of the operating rod 11.

An operation shaft 21 is rotatably supported on a surface of the mounting plate 1 on the control panel side via a bracket 20. Three operation levers 22 respectively corresponding to the three-phase operation rods 11 are attached to the operation shaft 21.
Each operation lever 22 is composed of two plate-like lever components arranged in parallel, and the distal end of each operation lever 22 and the connection fitting 18 provided at the distal end of the corresponding operation rod 11 are connected. They are connected by pins 23.

The operating shaft 21 and the output shaft of the breaker operating device 25 are connected via a connecting mechanism (not shown).
As a result, the operating shaft 21 is reciprocally rotated by a predetermined angle, and the first to third phase breakers CB1 to CB3 are opened and closed collectively.

When a closing command and a shutoff command are given, the operating device 25 releases the operating force stored in the energy storing means such as a spring at a stretch, and moves the operating shaft 21 counterclockwise in FIG. And is driven to rotate clockwise by a certain angle.

When the operating shaft 21 is driven counterclockwise in FIG. 2 by the operating device 25, the operating lever 22 rotates counterclockwise to displace the connection fitting 18 and the spring receiving plate 16 toward the mounting plate 1. Let it. Since this displacement is transmitted to the operating rod 11 via the contact pressure spring 17, the operating rod 11
Is the blocking part 3 together with the insulating operation rod 6a and the movable electrode rod 3e.
Side, and the movable contact 3b of the blocking unit 3 is
a, and the shut-off unit 3 enters the closed state. A contact pressure between the movable contact 3b and the fixed contact 3a is given by the biasing force of the compressed contact pressure spring 17.

When the interrupting section 3 is in the closed state, the path of the main circuit conductor 4-fixed electrode 3 d-fixed contact 3 a-movable contact 3 b-movable electrode rod 3 e-sliding contact 5 a-mounting base 5 or The main circuit current flows in the reverse path.

When the operating shaft 21 is driven clockwise in FIG. 2, the operating lever 22 rotates clockwise to displace the operating rod 11 and the insulating operating shaft 6a to the side opposite to the blocking portion. As a result, the movable contact 3b is separated from the fixed contact 3a, and the blocking unit 3 is turned off.

In the circuit breaker unit shown in FIGS. 1 to 3, the main circuit conductor 4 and the mounting base 5 of the circuit breaker of each phase are provided.
Are connected to other devices constituting the gas insulated switchgear through conductors (not shown).

As described above, when the insulating parts and the operating parts are supported by the insulating supporting frames F1 to F3 made of an integrally molded product, each part of the circuit breaker is supported by combining a large number of insulating supporting rods as in the prior art. Since there is no need to perform this, it is possible to reduce the number of parts and the number of assembling steps, thereby reducing costs.

Further, as described above, if the structure is such that both ends of the blocking portion accommodating space A and the operating portion accommodating space B are opened, the direction perpendicular to the plane of FIG. Gas can be distributed to
The cooling of the blocking unit 3 can be effectively achieved, and the temperature rise of the blocking unit can be suppressed.

Further, as described above, if the structure is such that both ends of the blocking section accommodating space A and the operation section accommodating space B are opened, the main circuit conductor 4 and the mounting table 5 are connected to other devices. Since the conductor can be drawn out from either opening side of the cut-off section accommodating space A and the operation section accommodating space B, the arrangement of the conductor for connecting the main circuit conductor 4 and the mounting base 5 to other equipment is provided. Characteristic, and the margin of design of the switchgear can be increased.

With the above construction, the side walls of the insulating support frames F1 to F3 function as insulating barriers for insulation between the phases and between the both-end phases and the ground. The insulation between phase and ground can be strengthened.

With the above configuration, the mounting plate 1
Since the circuit breaker unit can be assembled without the above, the mounting plate 1 can be mounted on the case of the switchgear before mounting the circuit breaker unit, and the mounting of the heavy mounting plate 1 can be facilitated. it can.

FIGS. 4 to 6 show an example of the configuration of the second embodiment of the present invention. In this example, the insulating support frame F1 is shown in FIG.
F3 to F3 include the axis of the blocking portion, and the planes OO (see FIGS. 5 and 6) parallel to the opposing direction of the side walls 31 and 32 are used as division planes. Frame part F1a ~
F3a and the second frame portions F1b to F3b.

Both the first frame portion and the second frame portion have a pair of side walls 31 ′ and 32 ′ arranged in parallel with each other and a direction perpendicular to the direction in which the pair of side walls 31 ′ and 32 ′ are opposed to each other. And a pair of end walls 33 ', 34' and a pair of side walls 31 ', 32
′ And a partition wall 35 ′ provided so as to divide the space surrounded by the pair of end walls 33 ′ and 34 ′ in the direction opposite to the pair of end walls 33 ′ and 34 ′. The height dimension h '(see FIG. 6) is slightly smaller than half the height dimension h (see FIG. 3) of the insulating support frame shown in FIGS. Except for the small point, it has the same shape as the insulating support frame shown in FIGS.

The first and second frame portions F1a-F3a and F1b-
The F3b is interconnected and integrated by attaching the main circuit conductor 4 and the mounting base 5 across both.

In the illustrated example, a gap is provided between one end wall 33 'of each of the first frame portions F1a to F3a and one end wall 33' of each of the second frame portions F1b to F3b. By enlarging the central part of the bolt 40, a hole for accommodating the head of the bolt 40 is formed, and the main circuit conductor 4 and the fixed electrode 3d are connected to the bolt 40.
Directly.

Each partition 35 'of the first frame portions F1a to F3a and each partition 35 of the second frame portions F1b to F3b.
, A hole for penetrating the movable electrode rod 3e of the first to third phase breakers is formed, and each of the first frame parts F1a to F3a is formed. By enlarging the center of the gap between the other end wall 34 'and the other end wall 34' of the second frame portions F1b to F3b,
An operation rod through hole is formed to penetrate the operation rod 11 of the first to third phase breakers. The other parts are configured in the same manner as the embodiment shown in FIGS.

In the examples shown in FIGS. 4 to 6, the insulating support frames F1 to F3 are divided in a direction perpendicular to the direction in which the pair of side walls face each other. In this case, the dividing direction of each insulating support frame may be a direction parallel to the facing direction of the pair of side walls. That is, a plane including the axis of the blocking portion and orthogonal to the facing direction of the pair of side walls is defined as a dividing plane (the dividing direction is set to a direction different from the dividing direction in the example shown in FIGS. 4 to 6 by 90 degrees), and the insulation is performed. Support frame F1 to F3
May be divided into a first frame portion and a second frame portion, respectively.

As described above, when the insulating support frame is divided into the first frame portion and the second frame portion, the assembling in which the blocking portion and the operation portion are attached to one of the frame portions and the other frame portion is assembled. Since the method can be adopted, the assembling work in each of the housing spaces can be facilitated when the blocking unit housing space and the operation unit housing space are deeply spaced. In addition, the circuit breaker can be assembled from one direction without reversing the direction of the insulating frame, and when connecting the operating rod to the insulating operating rod by penetrating the end wall on the operation unit housing space side. Since there is no need to perform the operation of inserting the operating rod into the hole having a small diameter, it is possible to easily assemble the circuit breaker.

In the above example, the insulating support frame is provided for each phase breaker. However, the insulating support frame may be provided in common for the three-phase circuit breakers.

FIGS. 7 to 9 show three-phase circuit breakers CB1 to CB.
B3 is supported on a common insulating support frame F and the circuit breaker unit U
Is a diagram illustrating a configuration example of a third embodiment of the present invention configured as above. The insulating support frame F used in this example includes a pair of side walls 51 and 52 and a pair of side walls 5 arranged in parallel with each other.
The space surrounded by the pair of end walls 53 and 54 facing in a direction perpendicular to the facing direction of the pair of side walls 1 and 52 and the pair of side walls and the pair of end walls is defined as the direction in which the pair of side walls 51 and 52 face each other. Divided into three equal parts, and arranged in the direction in which the pair of side walls 51 and 52 face each other.
The two partition walls 55 and 56 provided to form the phase breaker accommodating spaces A1 to A3 and the first to third phase circuit breaker accommodating spaces A1 to A3 are respectively connected to the pair of end walls 53 and 56.
It is made of a synthetic resin integrally molded product having first to third-phase partitions 57 to 59 provided so as to be divided into two in the direction opposite to the partition 54. In this insulating support frame, first to third phase cut-off portion accommodating spaces A11, A21 and A31 each having both ends opened between one end wall 53 and first to third phase partition walls 57 to 59. Are formed, and the first to third
Both ends (the opposing directions of the side walls 51 and 52 and the end walls 53 and 5) are provided between the phase partition walls 57 to 59 and the other end wall 54, respectively.
The first to third-phase operation unit accommodating spaces A12, A22, and A32 are formed with openings at both ends in a direction perpendicular to both of the four opposing directions.

The first to third phase partition walls 57 to 59 are respectively provided with the first to third phase blocking portion accommodating spaces A11 to A31.
First to third phase breakers CB1 respectively housed in
CB3 through which the movable electrode rod 3e of the blocking part 3 is formed, and first to third phase circuit breakers housed in the first to third phase operation part housing spaces A12 to A32. A mounting base fixing portion for fixing the mounting base 5 is provided.

On one end wall 53, a main circuit for mounting the main circuit conductors 4 of the first to third phase breakers arranged in the first to third phase breaker accommodating spaces A11 to A31, respectively. A conductor mounting portion is provided, and the other end wall 54 has an operating portion 6 of the first to third phase breaker housed in the first to third phase operating portion housing spaces A12 to A32, respectively.
There is provided an operation rod through-hole for penetrating the operation rod 11 connecting the to the operation device.

The first to third phase circuit breakers CB1 to CB3 of the first to third phase circuit breakers CB1 to CB3 are accommodated in the first to third phase circuit breaker housing spaces A11 to A31, respectively. The main circuit conductors 4 of the first to third phase breakers are fixed to one end wall 53. In addition, the movable electrode rod 3e of the interrupter 3 of the first to third phase breakers penetrates the first to third phase partitions 57 to 59, respectively, and the first to third phases.
It is introduced into the operation unit accommodating spaces A12 to A32 of the phase. First to third phase operation unit accommodation spaces A12 to A32 of the insulating support frame
The first to third phase breaker mounting base 5 and the operation unit 6 are accommodated therein, respectively, and the first to third phase breaker mounting base 5 is mounted on the first to third phase partition walls 57 to 57, respectively. 59.

Then, the end wall 54 of the insulating support frame F is fixed to the mounting plate 1 by bolts 42, and the operating rod 11 for connecting the operating portion 6 of the first to third phase breakers to the operating device 25 is provided. Hole 1a provided in mounting plate 1 and insulating support frame F
Is connected to the insulated operation rod 6a in the first to third-phase operation part accommodating chambers A12 to A32 through an operation rod through hole provided in the other end wall 54. The other points are configured in the same manner as the examples shown in FIGS.

As shown in FIGS. 7 to 9, when the three-phase circuit breaker is supported by the integrally formed common insulating support frame, the number of parts is reduced, the structure is simplified, and assembly is performed. Man-hours can be reduced, and costs can be reduced.

FIG. 10 to FIG. 12 show a fourth embodiment of the present invention. In this example, an insulating support frame F provided commonly for a three-phase circuit breaker is provided with first to fourth embodiments. With the plane OO including the axes of the three-phase circuit breakers CB1 to CB3 as dividing planes, first frame portions Fa arranged on both sides of the dividing plane.
And a second frame portion Fb. First frame Fa
The second frame portion Fb includes a pair of side walls 51 ′ and 52 ′ arranged in parallel with each other, and a pair of end walls opposed to each other in a direction perpendicular to the direction in which the pair of side walls 51 ′ and 52 ′ face each other. 53 ', 5
The space surrounded by the side wall 4 'and the pair of side walls and the pair of end walls is divided into three equal parts in the direction in which the pair of side walls 51' and 52 'are opposed to each other and arranged in the direction in which the pair of side walls 51' and 52 'are opposed. The two partition walls 55 ', 56' provided to form the first to third phase circuit breaker accommodating spaces A1 to A3 and the first to third phase circuit breaker accommodating spaces A1 to A3 are respectively paired. End wall 53
′, 54 ′ are provided so as to be divided into two in the opposite direction.
To the third phase partition walls 57 'to 59', each of which is half the height of the insulating support frame F shown in FIGS. 7 to 9. 9 except that it is set slightly smaller than FIG.
Are formed in the same manner as the insulating support frame F shown in FIG. The first frame portion Fa and the second frame portion Fb are connected and integrated by mounting the main circuit conductor 4 and the mounting base 5 of the circuit breaker of each phase over both frame portions.

In the examples shown in FIGS. 10 to 12, the first
Facing the first to third-phase blocking portion accommodating spaces A11 to A31 in the gap between the one end wall 53 'of the frame portion Fa and the one end wall 53' of the second frame portion Fb. By enlarging the central portion of each part, a hole for accommodating the head of the bolt 40 is formed, and the main circuit conductor 4 and the fixed electrode 3d are connected to the bolt 4
0 directly concludes.

The partition walls 57 'to 59' of the first frame portion Fa are also provided.
By expanding the central part of the gap between the partition wall 57'-59 'of the second frame portion Fb, a hole for penetrating the movable electrode rod 3e of the first to third phase breaker is formed. And
The other end wall 54 'of the first frame portion Fa and the second frame portion Fb
By enlarging the central portions of the gaps between the other end wall 54 'and the operation device accommodating spaces A12 to A32, the operation rods 11 of the first to third phase breakers are penetrated. An operation rod through hole to be formed is formed. Other points are the same as those of the embodiment shown in FIGS.

[0087]

As described above, according to the present invention, the insulating portion and the operating portion are supported by the insulating support frame formed of an integrally molded product. The number of parts and the number of assembling steps can be reduced as compared with the case where each part of the circuit breaker is supported, and the cost can be reduced.

According to the present invention, the insulating support frame is provided with the cut-off portion housing space and the operation portion housing space having both ends opened,
Since the structure in which the shut-off portion and the operation portion of the circuit breaker are housed in these housing spaces, respectively, gas can be always circulated through both the housing spaces, and the cooling of the shut-off portion is effectively performed, and Temperature rise can be suppressed.

Further, according to the present invention, since the insulating support frame has a structure in which both ends of the cut-off portion accommodating space and the operation portion accommodating space are opened, the space between the main circuit conductor and the mounting stand and other devices is provided. The conductor to be connected can be drawn out from the opening side of either the cut-off section accommodating space or the operation section accommodating space, and has flexibility in the arrangement of the main circuit conductor and the conductor for connecting the mounting base to other equipment. As a result, the design margin of the switchgear can be increased.

Further, according to the present invention, the side walls of the insulating support frame function as insulating barriers for insulation between the phases and between the both-end phases and the ground. And the circuit breaker unit can be made compact.

[Brief description of the drawings]

FIG. 1 is a plan view partially showing a configuration example of a first embodiment of a circuit breaker unit according to the present invention.

FIG. 2 is a cross-sectional view of FIG.
It is a line sectional view.

FIG. 3 is a left side view of the circuit breaker unit shown in FIGS. 1 and 2;

FIG. 4 is a plan view partially showing a configuration example of a circuit breaker unit according to a second embodiment of the present invention;

FIG. 5 is a cross-sectional view of FIG.
It is a line sectional view.

FIG. 6 is a left side view of the circuit breaker unit shown in FIGS. 4 and 5;

FIG. 7 is a plan view showing a configuration example of a circuit breaker unit according to a third embodiment of the present invention in a partial cross section.

FIG. 8 is a partial cross-sectional view of FIG.
It is a line sectional view.

FIG. 9 is a left side view of the circuit breaker unit shown in FIGS. 7 and 8;

FIG. 10 is a plan view showing a configuration example of a circuit breaker unit according to a fourth embodiment of the present invention in a partial cross section.

FIG. 11 is a cross-sectional view of FIG.
It is X4 line sectional drawing.

FIG. 12 is a left side view of the circuit breaker unit shown in FIGS. 10 and 11;

FIG. 13 is a plan view partially showing a configuration example of a conventional circuit breaker unit.

FIG. 14 is a cross-sectional view of FIG.
It is X5 line sectional drawing.

FIG. 15 is a left side view of the circuit breaker unit shown in FIGS. 13 and 14;

[Description of Signs] F, F1 to F3 ... insulating support frame, 1 ... mounting plate, 3 ... blocking part, 3a ... fixed contact, 3b ... movable contact, 3c ... container, 3d ... fixed electrode, 3e ... movable electrode Rod, 4: main circuit conductor, 5: mounting base, 5a: sliding contact, 6: operating unit, 6
a ... insulating operation rod, 31, 32 ... paired side walls, 33, 34 ...
A pair of end walls, 35 ... partition walls, A, A11 to A31 ... blocking unit accommodation spaces, B, B12 to B32 ... operation unit accommodation spaces, U, U1 to U
3 ... breaker unit, F1a to F3a, Fa ... first frame part
F1b to F3b, Fb... Second frame, CB1 to CB3.
Or a third phase circuit breaker.

Claims (9)

[Claims] A fixed contact and a linearly displaceable movable contact that comes into contact with and separate from the fixed contact are accommodated in a container, and a fixed electrode and a linear displacement connected to the fixed contact and the movable contact, respectively. And a main circuit conductor connected to a fixed electrode of the cut-off portion, and a movable electrode rod of the cut-off portion. A mounting base having a sliding contact for slidingly contacting the movable electrode rod via the sliding contact, and an operating section having an insulating operating rod for transmitting an operating force to the movable electrode rod; A circuit breaker unit comprising a circuit breaker provided with an insulating support frame attached to an insulating support frame, wherein the insulating support frame is surrounded by a plate-shaped wall, and has a cut-off section housing space and an operation section housing space open at both ends. And the cut-off section housing space and the operation section housing space A breaker and a main circuit conductor of the circuit breaker are housed in a breaker housing space of the insulating support frame, and the main circuit conductor is formed of the partition. The movable electrode rod penetrates through the partition wall and is introduced into the operation unit housing space, and the operation unit and the mounting base of the circuit breaker are mounted on the operation unit housing space of the insulating support frame. The circuit breaker unit is housed, and the mounting base is fixed to the partition wall. 2. A fixed contact and a linearly displaceable movable contact that comes into contact with and separate from the fixed contact are accommodated in a container, and a fixed electrode and a linear displacement connected to the fixed contact and the movable contact, respectively. And a main circuit conductor connected to a fixed electrode of the cut-off portion, and a movable electrode rod of the cut-off portion. A mounting base having a sliding contact for slidingly contacting the movable electrode rod via the sliding contact, and an operating section having an insulating operating rod for transmitting an operating force to the movable electrode rod; A circuit breaker unit comprising a circuit breaker provided with an insulating support frame, wherein the insulating support frame is opposed to a pair of side walls arranged in parallel with each other, and in a direction perpendicular to an opposing direction of the pair of side walls. Paired end walls, and said paired side walls and paired ends And a partition provided integrally so as to divide the space surrounded by the two end walls in the direction opposite to the pair of end walls. And between the other end wall and the partition wall, a blocking portion accommodating space in which both ends in a direction perpendicular to both the opposing direction of the pair of side walls and the opposing direction of the pair of end walls are open. And an operation section accommodation space is formed, and the interruption section of the circuit breaker and the main circuit conductor are accommodated in the interruption section accommodation space of the insulating support frame, and the main circuit conductor is fixed to the one end wall. The movable electrode of the circuit breaker penetrates the partition wall of the insulating support frame and is introduced into the operation section accommodating space. And the mounting base is fixed to the partition wall of the insulating support frame of each phase. An operation rod connecting the operation unit of the circuit breaker to the operation device
The circuit breaker unit is connected to the operation unit through the other end wall of the insulating support frame. 3. The insulating support frame is divided into a first frame portion and a second frame portion disposed on both sides of the dividing surface, with a plane including an axis of the blocking portion as a dividing surface, 3. The circuit breaker unit according to claim 1, wherein the first and second frame portions are connected to each other via the main circuit conductor and a mounting table. 4. 4. A fixed electrode and a linearly displaceable movable contact which comes into contact with and separate from the fixed contact are accommodated in a container, and a fixed electrode and a linear displacement are respectively connected to the fixed contact and the movable contact. And a main circuit conductor connected to a fixed electrode of the cut-off portion, and a movable electrode rod of the cut-off portion. A mounting base having a sliding contact for slidingly contacting the movable electrode rod via the sliding contact, and an operating section having an insulating operating rod for transmitting an operating force to the movable electrode rod; And a circuit breaker provided with three phases.
In a circuit breaker unit in which phase breakers are attached to an insulating support frame with their respective axes parallel to each other, the insulating support frame has a pair of side walls arranged in parallel with each other, and a facing direction of the pair of side walls. A space surrounded by a pair of end walls opposed to each other in a direction perpendicular to the pair, and a space surrounded by the pair of side walls and the pair of end walls is divided into three equal parts in the direction in which the pair of side walls face each other. The two partition walls provided so as to form the first to third-phase circuit breaker accommodating spaces arranged in the facing direction, and the first to third phase circuit-breaker accommodating spaces are respectively formed by the pair of end walls. First and third phase partitions provided so as to be divided into two in the facing direction are integrally formed, and both ends are opened between one end wall and the first to third phase partitions. A first to third phase blocking portion accommodating space is formed, and the first to third phases are blocked. A first to third-phase operating portion accommodating space having both ends opened is formed between the partition wall and the other end wall, and each of the phases is blocked in the insulating portion accommodating space of each phase of the insulating support frame. The main circuit conductor of each phase is fixed to the one end wall, and the movable electrode rod of the cutoff part of each phase penetrates the partition of each phase. The operation unit accommodating space of each phase is introduced into the operation unit accommodating space of each phase, and a mounting table and an operation unit of the circuit breaker of each phase are accommodated in the operation unit accommodating space of each phase of the insulating support frame. An operation rod for connecting the operation unit of the circuit breaker of each phase to the operation device penetrates the other end wall of the insulating support frame and is connected to the operation unit in the operation unit accommodation chamber of each phase. A circuit breaker unit, characterized in that: 5. The three-phase circuit breaker is disposed in a state where respective axes are positioned on the same plane, and the insulating support frame has a plane including an axis of the three-phase interrupter as a dividing plane. The first and second frames are divided into a first frame and a second frame disposed on both sides of the dividing surface, and the first and second frames are connected via a main circuit conductor and a mounting base of a circuit breaker of each phase. The circuit breaker unit according to claim 4, wherein the circuit breaker unit is connected to the circuit breaker unit. 6. A fixed contact and a linearly displaceable movable contact that comes into contact with and separate from the fixed contact are accommodated in a container, and a fixed electrode and a linear displacement connected to the fixed contact and the movable contact, respectively. And a main circuit conductor connected to a fixed electrode of the cut-off portion, and a movable electrode rod of the cut-off portion. A mounting base having a sliding contact for slidingly contacting the movable electrode rod via the sliding contact, and an operating section having an insulating operating rod for transmitting an operating force to the movable electrode rod; A circuit breaker unit insulating support frame supporting a circuit breaker comprising: a pair of side walls arranged in parallel to each other, and a pair of end walls opposed to each other in a direction perpendicular to a direction in which the pair of side walls face each other. A space surrounded by the pair of side walls and the pair of end walls. It is made of a synthetic resin molded article integrally having a partition provided so as to be divided into two in the opposite direction of the pair of end walls, and is formed between one end wall and the partition and the other end. An interrupting portion housing space for housing the interrupting portion of the circuit breaker and the main circuit conductor, and an operating portion housing space for housing the operating portion and the mounting base of the circuit breaker are formed between the wall and the partition wall. The blocking section accommodating space and the operation section accommodating space are provided in a state where both ends in a direction perpendicular to both the opposing direction of the pair of side walls and the opposing direction of the pair of end walls are opened, A hole for penetrating the movable electrode rod of the blocking part housed in the blocking part housing space is formed, and a mounting base fixing part for fixing a mounting base housed in the operation part housing space is provided. The one end wall is housed in the blocking space. A main circuit conductor mounting portion for mounting a main circuit conductor to be operated, and an operation for penetrating an operation rod for connecting an operation unit housed in the operation unit housing space to an operation device is provided on the other end wall. An insulating support frame for a breaker unit, wherein a rod through hole is provided. 7. A plane including an axis of the circuit breaker is divided into first and second frame portions disposed on both sides of the divided surface, and the first and second frame portions are separated from each other. 7. The insulating support frame for a circuit breaker unit according to claim 6, wherein the insulating support frame is connected via a main circuit conductor and a mounting base. 8. A fixed electrode and a linearly-displaceable movable contact that comes into contact with and separate from the fixed contact are accommodated in a container, and a fixed electrode and a linear displacement connected to the fixed contact and the movable contact, respectively. And a main circuit conductor connected to a fixed electrode of the cut-off portion, and a movable electrode rod of the cut-off portion. An operating unit having a mounting base having a sliding contact for slidingly contacting the movable electrode rod via the sliding contact, and an insulating operating rod for transmitting an operating force to the movable electrode rod And a pair of side walls arranged in parallel with each other in an insulating support frame for a circuit breaker unit that supports the first to third phase circuit breakers each having: Direction perpendicular to the opposite direction of the side wall A space surrounded by the pair of end walls, and the space surrounded by the pair of side walls and the pair of end walls is divided into three equal parts in the direction in which the pair of side walls face each other, and is arranged in the first direction through the first direction. Two partition walls provided so as to form a three-phase circuit breaker accommodating space, and the first to third phase circuit breaker accommodating spaces are each divided into two in a direction opposite to the pair of end walls. The first to third-phase partition walls provided are integrally provided, and the first to third-phase blocking portion accommodating spaces are respectively provided between one end wall and the first to third phase partition walls. The first to third phase partition walls are respectively formed between the first to third phase partition walls and the other end wall, and the first to third phase partition walls are formed. The first to third housings respectively housed in the first to third phase shutoff housing spaces.
A hole for penetrating the movable electrode rod of the breaker of the phase breaker is formed, and mounting of the first to third phase breakers housed in the first to third phase operation unit housing spaces. A mounting base fixing part for fixing a base is provided, and a main circuit conductor of a first to third phase breaker disposed in the first to third phase breaker receiving space on the one end wall. A main circuit conductor mounting portion for mounting the first and third phase breaker disposed in the first to third phase operation portion accommodating spaces on the other end wall. An operation rod through-hole for penetrating an operation rod connected to the vessel is provided, and the first to third phase circuit breaker accommodating spaces are provided in the opposing direction of the pair of side walls and the opposing direction of the pair of end walls. Provided with both ends open at right angles to both sides Breaker unit insulating supporting frame, characterized by being. 9. A first frame part and a second frame part which are arranged on both sides of the division surface with a plane including the axis of the first to third phase circuit breakers as a division surface, 9. The insulating support frame for a circuit breaker unit according to claim 8, wherein the first frame portion and the second frame portion are connected via the main circuit conductor and a mounting base.