TWI536419B - Vacuum circuit breaker - Google Patents

Description

Vacuum circuit breaker

This invention relates to vacuum interrupters, and more particularly to vacuum circuit breakers that connect an accessory machine to a main circuit section.

Circuit breakers used in power systems have long been known as gas circuit breakers. The insulating gas used in the gas circuit breaker is, for example, SF6 gas. Although SF6 gas has excellent insulation properties such as high insulation resistance, inertness, and high thermal conductivity, it has a problem that the greenhouse effect coefficient is extremely high. Therefore, the trend of restricting the use of SF6 gas is becoming more and more obvious, and the development of a gas circuit breaker using SF6 gas is eliminated, and the vacuum circuit breaker not using SF6 gas is developed. In this case, since the cost of replacing the switchboard for accommodating the circuit breaker is large, and the construction period is also long, there is a technique of replacing only a part of the gas circuit breaker housed in the existing switchboard with a vacuum circuit breaker. Has been proposed.

For the technique of replacing a conventional circuit breaker with a vacuum circuit breaker, for example, a circuit breaker as shown in Fig. 5 has been disclosed (see, for example, 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, and selecting a vacuum circuit breaker 21 suitable for a magnetic circuit breaker as shown in FIG. 5 and an existing switchboard, and then vacuuming The fixing frame 22 of the circuit breaker 21 is provided The vacuum circuit breaker 21 is placed in the switchboard by being placed in the switchboard. Further, a barrier 23 or the like is added as appropriate, and a CR suppressor 24 is provided as a surge absorber in a feeder chamber behind the breaker chamber. The 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 through the connection conductor.

Such a vacuum interrupter 21 has a very good cutting performance because the current is cut off at a high speed in a vacuum, but a surge voltage is generated at the time of opening and closing, and a CR suppressor 24 or the like is necessary to protect the load. The surge absorber is additionally set when changing to the vacuum circuit breaker 21.

[Previous Technical Literature] (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2005-269771 (pages 3 to 4, FIG. 3)

In the updating operation of the circuit breaker disclosed in Patent Document 1, the CR suppressor is disposed behind the circuit breaker chamber in the switchboard, and then connected by a cable or a conductor, so that the CR suppressor is set in the switchboard. Various components must be removed, and because of the small space, sometimes the operator must move with the CR suppressor. In addition, since the connection work is performed at the last place, the workability of configuration and connection is poor, so there is a problem that requires a long working time.

The present invention has been made to solve the above problems, and an object thereof is to provide a vacuum disconnection in which installation and assembly of an accessory device such as a CR suppressor are easy. Device.

The vacuum circuit breaker of the present invention comprises: a vacuum valve having a fixed contact and a movable contact; a body frame accommodating the vacuum valve; a contact electrically connected to the vacuum valve, and is derived a main circuit terminal to the rear of the main body frame; a bogie frame that is mounted on the main body frame and movable in the front-rear direction; and an auxiliary machine that is disposed below the main circuit terminal behind the main body frame and has a connection terminal at an upper portion thereof And a contact provided on the main circuit terminal facing the auxiliary device; and configured to electrically connect the accessory device to the aforementioned device by fitting the connection terminal of the accessory device to the contact member Main circuit terminal.

According to the vacuum circuit breaker of the present invention, the accessory device is disposed behind the body frame in which the vacuum valve is housed, and the connection terminal of the accessory device is fitted to the contact member provided in the main circuit terminal. The accessory machine is electrically connected to the main circuit terminal; therefore, the accessory machine can be easily connected to the main circuit portion of the vacuum circuit breaker. Therefore, in the operation of replacing a conventional gas circuit breaker with a vacuum circuit breaker, for example, when a new accessory machine is attached, workability can be improved, and work time and cost can be reduced.

1‧‧‧Vacuum circuit breaker

2‧‧‧Vacuum valve

2a‧‧‧ movable electrode rod

3‧‧‧ Ontology framework

4‧‧‧ Fixed side main circuit terminal

5‧‧‧ movable side main circuit terminal

6‧‧‧Main circuit contact

7‧‧‧Trolley frame

7a‧‧‧ Wheels

8‧‧‧ panel

9‧‧‧Insulation rod

10‧‧‧Circuit Breaker Room

11‧‧‧Departure Department

12‧‧‧CR suppressor

12a‧‧‧ body box

12b‧‧‧ mounting flange

12c‧‧‧Connecting terminal

12d‧‧‧ Grounding terminal

13‧‧‧Connecting conductor

14‧‧‧Contacts

15‧‧‧ Grounding wire

21‧‧‧Vacuum circuit breaker

22‧‧‧Fixed frame

24‧‧‧CR suppressor

25‧‧‧ Busbar

26‧‧‧ cable

Fig. 1 is a side view showing an important part of a vacuum circuit breaker according to Embodiment 1 of the present invention.

Fig. 2 is a rear view as seen from the back of the vacuum circuit breaker of Fig. 1.

Fig. 3 is a partial plan view seen from line A-A in Fig. 1.

Fig. 4 is a side view showing an important part of a vacuum circuit breaker according to a second embodiment of the present invention.

Fig. 5 is a side view for explaining an example of updating a conventional vacuum circuit breaker.

Embodiment 1.

Fig. 1 is a side view showing an important part of the vacuum circuit breaker of the first embodiment, Fig. 2 is a rear view thereof, and Fig. 3 is a partial plan view seen from line A-A in Fig. 1.

In the first drawing, the left side is the front side of the vacuum circuit breaker 1, and therefore, in the following description, terms such as the back side, the front side, the rear side, and the front-rear direction are based on the front side.

In the drawing, the vacuum valve 2 constituting the disconnecting portion of the vacuum circuit breaker 1 is configured such that a fixed contact and a movable contact (not shown) are separably separated in a vacuum container formed in a cylindrical shape, and It is housed in the body frame 3. Further, the fixed-side main circuit terminal 4 electrically connected to the fixed contact is pulled out from the upper side of the vacuum valve 2 to the axis of the vacuum valve 2 to the back side, and is electrically connected to the movable side of the movable contact. The circuit terminal 5 is pulled out from the lower side of the vacuum valve 2 in the same direction as the fixed side.

The main circuit contact 6 is provided on each of the front end sides of the fixed side main circuit terminal 4 and the movable side main circuit terminal 5. The main circuit contact 6 is formed by, for example, arranging a plurality of pieces of contact sub-pieces in the circumferential direction, and spring-contacting the sub-pieces in the center direction by a spring provided on the outer circumference thereof.

The main body frame 3 is mounted on the bogie frame 7 including the wheel 7a. It 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 operation mechanism (not shown) of the vacuum valve 2 is housed on the front and back sides of the panel 8.

The movable electrode rod 2a pulled downward from the movable contact of the vacuum valve 2 is connected to the operating mechanism through the insulating rod 9 and the link mechanism (not shown), and the movable connection of the vacuum valve 2 is driven by the operation of the operating mechanism. The point is closed and joined to the fixed contact, thereby opening and closing the vacuum valve 2.

The vacuum circuit breaker 1 is usually housed in a circuit breaker chamber of a casing of a switchboard such as a switch gear, and is used in combination with other machines. The circuit breaker chamber 10 is indicated by a portion indicated by a dotted line in Fig. 1. A rail (not shown) for guiding the wheel 7a of the bogie frame 7 is provided on the floor of the breaker chamber 10, and a disconnecting portion 11 is provided on the rear wall of the breaker chamber 10. The main circuit contact terminals 4 on the fixed side main circuit terminal 4 and the movable side main circuit terminal 5 on the vacuum valve 2 side are fitted to the center conductor of the disconnecting portion 11. The rear side of the upper and lower two disconnecting portions 11 is, for example, the same as in Fig. 5, one of which is connected to the main circuit bus and the other to the cable on the load side.

Based on such a configuration, when the handle of the panel 8 provided in the vacuum circuit breaker 1 is pulled forward, the connection between the main circuit contact 6 and the disconnecting portion 11 is broken, and the disconnection state is obtained.

Among them, a CR suppressor 12 as an accessory device is placed and fixed on the bogie frame 7 at the rear of the main body frame 3. Further, the illustration in the main body case 12a of the CR suppressor 12 will be omitted.

As shown in Fig. 3, the CR suppressor 12 is attached to the fixed side of the carriage frame 7 on the left and right sides of the main body case 12a of the CR suppressor 12. The mounting flange 12b of the upper left and right surfaces of the rear portion of the frame 7 is attached to the screw hole on the side of the bogie frame 7 by the mounting hole portion of the mounting flange 12b. In consideration of the tolerance of the mounting portion, the mounting hole is formed into a long hole that is long in the left-right direction or a shape of the outer side notch as shown in Fig. 3 so that it can be adjusted.

On the other hand, the connection conductor 13 is provided on the side opposite to the CR suppressor 12 of each phase of the movable-side main circuit terminal 5 of the vacuum circuit breaker 1, and the vacuum-opening is fixed to the front end side of each of the connection conductors 13. One pair of contacts 14 are disposed at the rear of the device 1 and at intervals. The pair of contact members 14 are biased in a direction in which the interval is narrowed by, for example, a spring member (not shown).

On the upper surface of the main body case 12a of the CR suppressor 12, a connection terminal 12c connected to the three-phase of the main circuit side is protruded. The connection terminal 12c is fitted to the contact member 14 at a predetermined position where the main body case 12a is fixed to the carriage frame 7, and is connected to the contact member 14 at a predetermined contact pressure.

Further, the main body case 12a of the CR suppressor 12 is further provided with a ground terminal 12d which is grounded to the circuit breaker chamber 10 side by the grounding wire 15 after assembly.

Further, the shape of the contact 14 and the connection terminal 12c is not limited to that shown in the drawing, and the contact provided on the side of the connection conductor 13 can be formed, for example, in a rod shape, and the contact terminal of the CR suppressor 12 can be formed to be The shape of the contact piece that is slidably fitted to the rod shape, that is, the relationship with the one shown in each figure may be formed.

Next, the operation of the vacuum circuit breaker 1 configured as described above will be described.

In a switchgear equipped with a gas circuit breaker, etc., when only a part of the gas circuit breaker is replaced with a vacuum circuit breaker, the vacuum circuit breaker 1 generates high surge power. Since the pressure is suppressed, the CR suppressor 12 must be provided as a surge absorber in order to suppress the surge.

The CR suppressor 12 houses a series circuit of a capacitor (C) and a resistor (R) in the main body case 12a, and encloses insulating oil inside. Therefore, the weight depends on its capacity, but it also has a weight of, for example, 30 kg, which is not easy to handle. That is, as shown in Fig. 5, it is not easy to install the power supply chamber to the rear of the circuit breaker chamber, which is extremely difficult to work with.

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 provided from the back side in a state in which the upper and lower main circuit terminals 4 and 5 are assembled. One end of the mounting flange 12b is placed on the upper end of the rear end of the bogie frame 7, and slidingly pushed into a predetermined position allows the connecting terminal 12c to be fitted to the contact 14 so that the bolt is used at this position The mounting flange 12b is fixed to the carriage frame 7, and assembly is easily completed. In this assembled state, the replacement of the vacuum circuit breaker 1 can be completed by placing it on the circuit breaker chamber 10 on the switchboard side and moving it to the rear connection position to be connected to the disconnecting portion 11.

In the case where replacement is required, the CR suppressor 12 can be easily separated from the main body of the vacuum circuit breaker 1 and taken out in the reverse step.

In the above description, the accessory device CR suppressor 12 connected to the main circuit portion of the circuit breaker main body is assumed, but the accessory device is not limited thereto, and may be a surge absorber other than the CR suppressor. In addition, the same effect can be obtained in the case where the accessory machine is an instrument transformer (VT).

Further, the configuration described above is not limited to the case where the gas circuit breaker is to be updated to a vacuum circuit breaker, and is also applicable to a new vacuum circuit breaker.

As described above, the vacuum circuit breaker 1 according to the first embodiment includes a vacuum valve having a fixed contact and a movable contact, a body frame that houses the vacuum valve, and a contact that is electrically connected to the vacuum valve. And leading to a main circuit terminal at the rear of the main body frame; a bogie frame on which the main body frame is mounted and movable in a front-rear direction; a rear side of the main body frame disposed below the main circuit terminal, and an upper portion having a connection terminal a device; and a contact provided to the main circuit terminal facing the auxiliary device; and configured to electrically connect the accessory device to the aforementioned device by fitting a connection terminal of the accessory device to the contact member Since the main circuit terminal is in the form of a main circuit, it is possible to easily connect the accessory machine to the main circuit portion of the vacuum circuit breaker. Therefore, in the operation of replacing a conventional gas circuit breaker with a vacuum circuit breaker, for example, when a new accessory machine is attached, workability can be improved, and work time and cost can be reduced.

Further, since the auxiliary device is placed and fixed on the bogie frame behind the main body frame, the auxiliary machine and the circuit breaker body can be attached before the vacuum circuit breaker unit is installed in the circuit breaker chamber of the switchboard such as the switchgear. It is integrated and can improve workability.

Embodiment 2.

Fig. 4 is a side view showing a configuration of an essential part of a vacuum circuit breaker according to a second embodiment, and the same reference numerals are given to the same parts as those in the first embodiment, and the description thereof will be omitted. The difference lies in the mounting structure of the CR suppressor as an accessory machine.

In Fig. 4, the CR suppressor 12 is not attached to the carriage frame 7, but is placed on the floor of the circuit breaker chamber 10 between the carriage frames 7, and the main casing 12a is directly fixed to the circuit breaker chamber 10.

That is, in order to mount the body frame 3 assembled with the vacuum valve 2 on the frame of the trolley The frame 7 is fitted to the connection position of the main circuit contact portion 4 of the fixed side main circuit terminal 4 and the movable side main circuit terminal 5 to the connection position of the disconnecting portion 11, and becomes a rod-shaped connection terminal 12c of the CR suppressor 12. The fitting is fixed to the position of the contact 14 of the connecting conductor 13, and the mounting position of the CR suppressor 12 to the floor of the circuit breaker chamber 10 is determined in advance.

With this configuration, the CR suppressor 12 can be attached to the floor of the circuit breaker chamber 10 before the carriage frame 7 is mounted, and grounded to the breaker chamber 10 side by the grounding wire 15. Then, the entire frame can be constructed by placing the carriage frame 7 on the rail of the circuit breaker chamber 10 and pushing it into the connection position.

The above-described operation of mounting the CR suppressor 12 to the floor of the circuit breaker chamber 10 and grounding the grounding wire 15 to the side of the circuit breaker chamber 10 can be performed in a state before the carriage frame 7 on which the main body frame 3 is placed is placed. Therefore, it can be carried out with good workability.

Further, as in the case of the first embodiment, the accessory device connected to the main circuit portion of the circuit breaker main body is not limited to the CR suppressor as the surge absorber, and is only an accessory device whose one end is connected to the main circuit portion. applicable. Further, it may be a surge absorber other than the CR suppressor, or may be an instrument transformer (VT).

As described above, according to the vacuum circuit breaker 1 of the second embodiment, the auxiliary device is placed on the floor of the circuit breaker chamber in which the vacuum circuit breaker is housed, and the auxiliary device is mounted in the circuit breaker chamber in advance. When the main body of the circuit breaker mounted on the bogie frame is placed on the rail of the circuit breaker chamber and pushed in, the combination can be combined, and the workability of assembly can be improved.

In addition, by setting the accessory machine as a surge absorber, for example, in the operation of replacing the existing gas circuit breaker with a vacuum circuit breaker, even if it is necessary The case where the surge absorber is attached can also be easily set.

Further, by using the accessory device as an instrument transformer, the instrument transformer can be easily connected to the main circuit portion of the vacuum circuit breaker.

Further, the present invention can be freely combined with the respective embodiments within the scope of the invention, or the embodiments can be modified or omitted as appropriate.

1‧‧‧Vacuum circuit breaker

2‧‧‧Vacuum valve

2a‧‧‧ movable electrode rod

3‧‧‧ Ontology framework

4‧‧‧ Fixed side main circuit terminal

5‧‧‧ movable side main circuit terminal

6‧‧‧Main circuit contact

7‧‧‧Trolley frame

7a‧‧‧ Wheels

8‧‧‧ panel

9‧‧‧Insulation rod

10‧‧‧Circuit Breaker Room

11‧‧‧Departure Department

12‧‧‧CR suppressor

12b‧‧‧ mounting flange

12c‧‧‧Connecting terminal

12d‧‧‧ Grounding terminal

13‧‧‧Connecting conductor

14‧‧‧Contacts

15‧‧‧ Grounding wire

Claims (3)

A vacuum circuit breaker comprising: a vacuum valve having a fixed contact and a movable contact; the body frame of the vacuum valve is received upwardly and upwardly with the axis of the vacuum valve; and electrically connected to the upper side and the lower part of the vacuum valve a main circuit terminal that is led out to the upper rear side and the lower side of the main body frame; a bogie frame that is mounted on the main body frame and that is movable in the front-rear direction; and is disposed on the lower side of the rear side of the main body frame a surge absorber having a connection terminal connected to the main circuit terminal of the lower side at the lower side of the main circuit terminal; and the plurality of surge absorbers of the number of phases of the vacuum circuit breaker are arranged side by side with respect to the foregoing a main body case for supporting the surge absorber in a manner in which the lead-out directions of the main circuit terminals are orthogonal to each other; and a main circuit terminal mounted on the lower side opposite to the connection terminal of the surge absorber a contactor configured to move the aforementioned spur wave by moving the body frame relative to the spur absorber The contact element is connected to the terminal of the lower side of the main circuit terminals is fitted to the main circuit terminals of the surge absorber is electrically connected to the lower portion side. The vacuum circuit breaker according to claim 1, wherein the body case is fixed to the bogie frame at the rear of the body frame. The vacuum circuit breaker according to claim 1, wherein the main body case is fixed to a floor of the circuit breaker room accommodating the vacuum circuit breaker.