JP5657149B2 - Vacuum circuit breaker - Google Patents

Description

  The present invention relates to a vacuum circuit breaker, and more particularly to a vacuum circuit breaker in which an accessory is connected to a main circuit portion.

  Conventionally, a gas circuit breaker is well known as a circuit breaker used in an electric power system. The insulating gas used for this gas circuit breaker is, for example, SF6 gas. SF6 gas has excellent dielectric properties such as high dielectric strength, inertness, and high thermal conductivity, but has a problem of a very high global warming potential. For this reason, the movement which regulates use of SF6 gas is strengthened, and it is in the direction of replacing with the gas circuit breaker which uses SF6 gas with the vacuum circuit breaker which does not use SF6 gas. In this case, it is expensive to replace the entire board in which the circuit breaker is housed, and it takes a long period of time. Therefore, there is a technology that replaces only the part of the gas circuit breaker housed in the existing board with a vacuum circuit breaker. Proposed.

For example, a circuit breaker as shown in FIG. 5 is disclosed as a technique for replacing an existing circuit breaker with a vacuum circuit breaker. (For example, see Patent Document 1)
The technique disclosed in Patent Document 1 is an example of updating from a magnetic circuit breaker to a vacuum circuit breaker. However, as shown in FIG. 5, a vacuum circuit breaker 21 that matches the specifications of the magnetic circuit breaker and the existing switchboard is selected. The fixed frame 22 of the vacuum circuit breaker 21 is installed in the panel and the vacuum circuit breaker 21 is placed. Further, a barrier 23 or the like is added as appropriate, and a CR suppressor 24 is installed as a surge absorber in the feeder chamber behind the circuit breaker chamber. Here, one end side of the main circuit terminal of the vacuum circuit breaker 21 is connected to the existing bus bar 25, and the other end side is connected to the existing load-side cable 26 via the connection conductor.
Such a vacuum circuit breaker 21 has a very good breaking performance because it cuts off the current at high speed in a vacuum. However, a surge voltage is generated at the time of opening and closing, and depending on the load, a surge absorber such as a CR suppressor 24 may be used. It is necessary and will be additionally installed when the vacuum circuit breaker 21 is replaced.

Japanese Patent Laying-Open No. 2005-267971 (page 3-4, FIG. 3)

  In the update operation of the circuit breaker as shown in Patent Document 1, the CR suppressor is placed in the back of the circuit breaker room in the switchboard and is connected by a cable or a conductor. Therefore, when installing the CR suppressor in the switchboard It is necessary to remove various parts, and it is also necessary to move the CR suppressor by an operator in some cases due to the small space. Furthermore, there is a problem in that the connection work is performed in the back, the workability of arrangement and connection is poor, and a long work time is required.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vacuum circuit breaker in which an accessory device such as a CR suppressor can be easily installed and assembled.

A vacuum circuit breaker according to the present invention includes a vacuum valve having a fixed contact and a movable contact;
A main body frame that accommodates the vacuum valve with the axis of the vacuum valve facing up and down;
Main circuit terminals on the upper side and the lower side that are electrically connected to the upper and lower contacts of the vacuum valve and led out behind the main body frame;
A bogie frame mounted with the main body frame and movable in the front-rear direction;
A surge absorber disposed below the main circuit terminal on the lower side behind the main body frame and having a connection terminal connected to the main circuit terminal on the lower side on the upper part ;
A body case that horizontally arranges the surge absorbers for the number of phases of the vacuum circuit breaker, and juxtaposes the surge absorbers in a direction orthogonal to the lead-out direction of the main circuit terminals, and collectively supports the surge absorbers;
A contactor mounted on the main circuit terminal on the lower side so as to face the connection terminal of the surge absorber ,
By fitting the said contact of the main circuit terminals of the connection terminal and the lower side of the surge absorber, which the surge absorber is configured to be electrically connected to the main circuit terminals of the lower side It is.

According to the vacuum circuit breaker of the present invention, the surge absorber is disposed behind the main body frame in which the vacuum valve is accommodated with the axis line directed up and down, and is provided on the connection terminal of the surge absorber and the main circuit terminal on the lower side of the vacuum valve. Since the surge absorber is electrically connected to the main circuit terminal on the lower side by fitting the contact with the contactor, the surge absorber can be easily connected to the main circuit section of the vacuum circuit breaker. be able to. For this reason, for example, in the operation of replacing an existing gas circuit breaker with a vacuum circuit breaker, when a surge absorber is newly installed, workability is improved, and work time and cost can be reduced.

It is a side view which shows the principal part of the vacuum circuit breaker concerning Embodiment 1 of this invention. It is the rear view seen from the back surface of the vacuum circuit breaker in FIG. It is the fragmentary top view seen from the AA line in FIG. It is a side view which shows the principal part of the vacuum circuit breaker concerning Embodiment 2 of this invention. It is a side view for demonstrating the update example of the conventional vacuum circuit breaker.

Embodiment 1 FIG.
1 is a side view showing a main part of a vacuum circuit breaker according to Embodiment 1, FIG. 2 is a rear view thereof, and FIG. 3 is a partial plan view seen from the line AA in FIG.
In FIG. 1, since the left side is the front side of the vacuum circuit breaker 1, in the following description, the terms such as the back side, the front side, the rear side, and the front-back direction are based on the front side.

In the figure, a vacuum valve 2 constituting a shut-off portion of the vacuum circuit breaker 1 is arranged in a cylindrical vacuum vessel so that a fixed contact and a movable contact (both not shown) can be contacted and separated, and a body frame 3 Is housed in. Further, the fixed main circuit terminal 4 electrically connected to the fixed contact is drawn from the upper side of the vacuum valve 2 to the back side perpendicular to the axis of the vacuum valve 2 and is electrically connected to the movable contact from the lower side. The side main circuit terminal 5 is drawn out in the same direction as the fixed side.
A main circuit contact 6 is provided on each distal end side of the fixed side main circuit terminal 4 and the movable side main circuit terminal 5. The main circuit contact 6 is configured such that, for example, a large number of contact pieces are arranged in the circumferential direction, and the contact pieces are biased in the center direction by a spring provided on the outer periphery thereof.

The main body frame 3 is mounted on a carriage frame 7 having wheels 7a and is configured to be movable in the front-rear direction. Further, a face plate 8 is provided on the front side of the main body frame 3, and an operating mechanism (not shown) for the vacuum valve 2 is accommodated on the back side of the face plate 8.
The movable electrode rod 2a drawn downward from the movable contact of the vacuum valve 2 is connected to the operation mechanism via an insulating rod 9 and a link mechanism (not shown), and the movable contact of the vacuum valve 2 is operated by the operation of the operation mechanism. Is driven, and the vacuum valve 2 is opened and closed by contacting and leaving the fixed contact.

The vacuum circuit breaker 1 is usually accommodated in a circuit breaker chamber of a casing of a panel such as a switch gear and used in combination with other devices. The part shown with the dashed-dotted line in FIG. 1 has shown the circuit breaker chamber 10. FIG. Rails (not shown) for guiding the wheels 7a of the bogie frame 7 are provided on the floor surface of the circuit breaker chamber 10, and a disconnecting portion 11 is provided on the rear wall of the circuit breaker chamber 10. . The main circuit contacts 6 of the fixed-side main circuit terminal 4 and the movable-side main circuit terminal 5 on the vacuum valve 2 side are fitted into the central conductor of the disconnection portion 11. Further, for example, one of the rear sides of the upper and lower disconnecting portions 11 is connected to the main circuit bus in the same manner as in FIG. 5, and the other is connected to the load-side cable.
Under such a configuration, by pulling the handle provided on the face plate 8 of the vacuum circuit breaker 1 and pulling it forward, the connection between the main circuit contact 6 and the disconnecting portion 11 is disconnected, and a disconnected state is established. .

Here, a CR suppressor 12 which is an accessory device is placed and fixed on the carriage frame 7 behind the main body frame 3. In addition, illustration in the main body case 12a of CR suppressor 12 is abbreviate | omitted.
As shown in FIG. 3, the fixed side to the carriage frame 7 is provided with mounting flanges 12b that can be placed on and engaged with the upper left and right upper surfaces of the carriage frame 7 on the left and right sides of the body case 12a of the CR suppressor 12, The mounting hole portion of the mounting flange 12b is aligned with the screw hole on the cart frame 7 side and fastened with a bolt. The mounting hole is a long hole in the left-right direction so that it can be adjusted in consideration of the tolerance of the mounting part, or has a shape with a notch on the outside as shown in FIG.

On the other hand, a connecting conductor 13 is provided on the side of the movable main circuit terminal 5 of the vacuum circuit breaker 1 on the side facing the CR suppressor 12, and the distal end of the connection conductor 13 faces the rear of the vacuum circuit breaker 1 with a gap. A pair of provided contacts 14 are fixed. The pair of contacts 14 is provided with a spring member (not shown) or the like, for example, and is biased in a direction in which the interval is reduced.
On the upper surface of the main body case 12a of the CR suppressor 12, a three-phase connection terminal 12c connected to the main circuit side is projected. The connection terminal 12c is fitted to the contact 14 at a predetermined position for fixing the main body case 12a to the carriage frame 7, and is connected with a predetermined contact pressure.
The main body case 12a of the CR suppressor 12 is provided with a ground terminal 12d, and is grounded to the circuit breaker chamber 10 side by a ground wire 15 after assembly.
Note that the shapes of the contact 14 and the connection terminal 12c are not limited to the drawings, and the contact provided on the connection conductor 13 side is, for example, a rod shape, and the connection terminal of the CR suppressor 12 is slid onto the rod-shaped contact. A shape that can be fitted, that is, a relationship opposite to that in the figure may be used.

Next, the operation of the vacuum circuit breaker 1 configured as described above will be described.
In a switchgear with a built-in gas circuit breaker, when only the gas circuit breaker is replaced with a vacuum circuit breaker, a high surge voltage is generated in the vacuum circuit breaker 1, so as a surge absorber for suppressing the surge. It may be necessary to provide a CR suppressor 12.
In the CR suppressor 12, a series circuit of a capacitor (C) and a resistor (R) is accommodated in a main body case 12a, and insulating oil is sealed inside. For this reason, although depending on the capacity, for example, there are some that weigh as much as 30 kg, and handling is not easy. That is, as shown in FIG. 5, it is not easy to install in the feeder chamber behind the circuit breaker chamber, and the workability is very poor and difficult.

On the other hand, according to the configuration of the first embodiment, before the vacuum circuit breaker 1 is assembled in the circuit breaker chamber 10, the CR suppressor 12 is installed from the back side with the upper and lower main circuit terminals 4 and 5 assembled. Since one end of the mounting flange 12b is placed on the upper rear end of the carriage frame 7 and is slid to a predetermined position and moved by pushing, the connection terminal 12c can be fitted to the contact 14 and connected. If the mounting flange 12b is fixed to the carriage frame 7 with bolts, the assembly is easily completed. In this assembled state, the vacuum circuit breaker 1 can be replaced by placing it in the circuit breaker chamber 10 on the panel side, moving it to the rear connection position, and connecting it to the disconnecting portion 11.
Further, in the case of replacement or the like, the CR suppressor 12 can be easily separated from the main body of the vacuum circuit breaker 1 and removed by a procedure reverse to the above.

In the above description, the accessory device connected to the main circuit portion of the circuit breaker main body is the CR suppressor 12, but the accessory device is not limited to this, and a surge absorber other than the CR suppressor may be used. Similar effects can be obtained even with an instrument transformer (VT).
Furthermore, the configuration as described above is not limited to the case where the gas circuit breaker is replaced with a vacuum circuit breaker, and can also be applied to a new vacuum circuit breaker.

As described above, according to the vacuum circuit breaker of the first embodiment, the vacuum valve having the fixed contact and the movable contact, the main body frame that accommodates the vacuum valve, and the contact of the vacuum valve are electrically connected. A main circuit terminal led behind the main body frame, a carriage frame on which the main body frame is mounted and movable in the front-rear direction, and disposed below the main circuit terminal behind the main body frame and connected to the upper part An accessory device having a terminal, and a contact provided on the main circuit terminal facing the accessory device,
Since the accessory device is configured to be electrically connected to the main circuit terminal by fitting the connection terminal of the accessory device and the contact, the accessory device can be easily connected to the main circuit of the vacuum circuit breaker. It can be installed by connecting to the part. For this reason, for example, in the operation | work which replaces an existing gas circuit breaker with a vacuum circuit breaker, workability improves, and work time and cost can be reduced when attaching an accessory apparatus newly.

  In addition, since the accessory device is mounted and fixed on the carriage frame behind the main body frame, the accessory device must be attached to the circuit breaker body before the vacuum circuit breaker is installed in the circuit breaker chamber of the switchgear etc. And can be combined integrally, and workability can be improved.

Embodiment 2. FIG.
FIG. 4 is a side view showing the configuration of the main part of the vacuum circuit breaker according to Embodiment 2, and the same parts as those in FIG. The difference is the assembly structure of the CR suppressor which is an accessory device.

In FIG. 4, the CR suppressor 12 is not attached to the bogie frame 7 but is placed on the floor surface of the circuit breaker chamber 10 between the bogie frames 7 to directly fix the main body case 12 a to the circuit breaker chamber 10. is there.
That is, the main body frame 3 incorporating the vacuum valve 2 is placed on the carriage frame 7, and the connection positions where the main circuit contacts 6 of the fixed main circuit terminal 4 and the movable main circuit terminal 5 are fitted to the disconnection portion 11. Then, the mounting position of the CR suppressor 12 on the floor surface of the circuit breaker chamber 10 is previously set so that the rod-shaped connection terminal 12c of the CR suppressor 12 is fitted to the contact 14 fixed to the connection conductor 13. Decide it.
With this configuration, the CR suppressor 12 can be attached to the floor surface of the circuit breaker chamber 10 and grounded to the circuit breaker chamber 10 side by the grounding wire 15 before the carriage frame 7 is attached. Thereafter, the entire apparatus can be configured by placing the carriage frame 7 on the rail of the circuit breaker chamber 10 and pushing it to the connection position.
Thus, the operation of attaching the CR suppressor 12 to the floor surface of the circuit breaker chamber 10 and grounding the ground wire 15 to the circuit breaker chamber 10 side is performed in a state before the carriage frame 7 on which the main body frame 3 is placed is arranged. Therefore, workability can be improved.

  As in the case of the first embodiment, the accessory device connected to the main circuit unit of the circuit breaker body is not limited to the CR suppressor that is a surge absorber, and one end is connected to the main circuit unit. Applicable to any accessory equipment. In addition, a surge absorber other than the CR suppressor may be used, and an instrument transformer (VT) may be used.

  As described above, according to the vacuum circuit breaker of the second embodiment, since the accessory device is mounted and fixed on the floor surface of the circuit breaker chamber in which the vacuum circuit breaker is accommodated, the accessory device is previously disconnected. The circuit breaker main body mounted on the bogie frame can be combined by being placed on the rail of the circuit breaker chamber and pushed in while attached to the chamber, and the assembly workability can be improved.

Further, by the surge absorber of the ancillary equipment, for example, in a work such as replacing the existing gas circuit breaker vacuum interrupter, even if the annexed surge absorber is needed, it can be easily installed.

  Furthermore, by making the accessory device an instrument transformer, the instrument transformer can be easily connected to the main circuit section of the vacuum circuit breaker.

  In the present invention, it is possible to freely combine the respective embodiments within the scope of the invention, and to appropriately change or omit the respective embodiments.

1: vacuum circuit breaker, 2: vacuum valve, 2a: movable electrode rod, 3: body frame,
4: fixed main circuit terminal, 5: movable main circuit terminal, 6: main circuit contact,
7: Bogie frame, 7a: Wheel, 8: Face plate, 9: Insulating rod,
10: Circuit breaker room, 11: Disconnection part, 12: CR suppressor,
12a: body case, 12b: mounting flange, 12c: connection terminal,
12d: Ground terminal, 13: Connection conductor, 14: Contact, 15: Ground wire.

Claims (3)

A vacuum valve having a fixed contact and a movable contact, and a main body frame for accommodating the vacuum valve with the axis of the vacuum valve facing up and down,
Main circuit terminals on the upper side and the lower side that are electrically connected to the upper and lower contacts of the vacuum valve and led out behind the main body frame;
A bogie frame mounted with the main body frame and movable in the front-rear direction;
A surge absorber disposed below the main circuit terminal on the lower side behind the main body frame and having a connection terminal connected to the main circuit terminal on the lower side on the upper part ;
A body case that horizontally arranges the surge absorbers for the number of phases of the vacuum circuit breaker, and juxtaposes the surge absorbers in a direction orthogonal to the lead-out direction of the main circuit terminals, and collectively supports the surge absorbers;
A contactor mounted on the main circuit terminal on the lower side so as to face the connection terminal of the surge absorber ,
By fitting the said contact of the main circuit terminals of the connection terminal and the lower side of the surge absorber, said surge absorber is configured to be electrically connected to the main circuit terminals of the lower side A vacuum circuit breaker characterized by The vacuum circuit breaker according to claim 1,
The vacuum circuit breaker characterized in that the main body case is fixed to the carriage frame at the rear of the main body frame. The vacuum circuit breaker according to claim 1,
The said main body case is being fixed to the floor surface of the circuit breaker chamber in which the said vacuum circuit breaker is accommodated, The vacuum circuit breaker characterized by the above-mentioned.

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