JP7309567B2 - gas circuit breaker - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker and, for example, to a gas circuit breaker suitable for use as a circuit breaker for electric power with high voltage specifications such as substations and switchyards.

Patent Document 1 describes a gas circuit breaker for electric power installed in a substation or a switching station, which uses a spring operating mechanism in which a spring is used as a driving force for breaking and closing.

In the gas circuit breaker using the spring operating mechanism of Patent Document 1, gas circuit breakers having different breaking performances such as 2-cycle breaking, 3-cycle breaking, or 5-cycle breaking can be provided simply by replacing the tripping operation part. It is described that it can be easily manufactured, and by replacing the tripping operation part, it is possible to easily switch between 2-cycle and 3-cycle breaking times with a single gas circuit breaker. there is

Japanese Patent No. 4833739

However, the above-mentioned Patent Document 1 describes a gas circuit breaker that can realize different breaking times such as 2-cycle breaking or 3-cycle breaking just by replacing the tripping operation part. The small housing that houses the tripping operation part in the described spring operation mechanism is arranged outside the large housing, and there is a problem that the small housing becomes larger as the operation energy of the gas circuit breaker increases. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a gas circuit breaker capable of reducing the size of the spring operation mechanism even if the operation energy is increased.

In order to achieve the above object, a gas circuit breaker according to the present invention comprises: a grounding container which is filled with an insulating gas and has a built-in breaking section having a fixed contact and a movable contact; A spring operating mechanism using a closing spring and a breaking spring for opening or closing a contact as a drive source, a link mechanism connecting the spring operating mechanism and the movable contact, and driving the closing spring. and a cam for converting a force into a force for compressing the breaking spring, wherein the spring operating mechanism comprises a main shaft of the spring operating mechanism and a tripping mechanism for holding and releasing driving force of the breaking spring, and a shaft of the cam. and a closing control mechanism for holding and releasing the driving force of the closing spring, wherein the tripping mechanism is housed in a small casing, and the closing control mechanism is housed in a large casing that is larger than the small casing. The gas circuit breaker is characterized in that the small housing is arranged inside the large housing.

According to the present invention, the size of the spring operation mechanism can be reduced even if the operation energy is increased.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic side view which partially breaks and shows the whole structure of Example 1 of the gas circuit breaker of this invention. It is a side view which shows the principal part of the spring operation mechanism in Example 1 of the gas circuit breaker of this invention. FIG. 3 is a side view of the spring operating mechanism shown in FIG. 2 omitting a small housing and a large housing; It is a figure explaining operation|movement of the spring operation mechanism in Example 1 of the gas circuit breaker of this invention, and is a figure which shows a compression state with a breaking spring and a closing spring. It is a figure explaining operation|movement of the spring operation mechanism in Example 1 of the gas circuit breaker of this invention, and is a figure which shows a breaking spring in a releasing state. It is a figure explaining operation of the spring operation mechanism in Example 1 of the gas circuit breaker of the present invention, and is a figure showing a closing spring in a released state and a breaking spring in a compressed state.

Hereinafter, the gas circuit breaker of the present invention will be described based on the illustrated embodiments. In addition, in each figure, the same code|symbol is used for the same component.

FIG. 1 shows the overall configuration of Example 1 of the gas circuit breaker of the present invention, partially cut away.

In the gas circuit breaker 100 of this embodiment shown in the figure, a cylindrical grounded container 103 is installed on a frame 105, and the grounded container 103 is filled with, for example, SF6 gas (sulfur hexafluoride gas) as an insulating gas. Sealed with specified pressure. Bushings 101 and 102 are provided obliquely upward from the ground container 103, and conductors (not shown) are accommodated in the bushings 101 and 102. As shown in FIG. An operation box 104 that houses the spring operation mechanism 400 is attached to the side of the pedestal 105 .

Further, in the grounding container 103, a switching contact composed of a fixed contact 62 and a movable contact 63 is provided. FIG. 1 shows a state in which the switching contacts are closed, and the movable contactor 63 is in contact with the fixed contactor 62 .

Further, during the breaking operation of the gas circuit breaker 100, the movable contact 63 is separated from the fixed contact 62 by a predetermined distance. The movable contact 63 is connected to an insulating link 64 made of an insulator on the side opposite to the contact end with the fixed contact 62 .

A rotating shaft 66 is rotatably supported in the ground container 103 , and one ends of a first link 65 and a second link 67 are fixed to the rotating shaft 66 . Although illustration is omitted, the first link 65 and the second link 67 are fixed to the rotating shaft 66 on different surfaces, and the first link 65 is provided in the ground container 103, but the second link 65 is provided inside the ground container 103. The link 67 of is provided in the atmosphere. That is, the rotation shaft 66 keeps the gas in the grounded container 103 airtight. One end of the insulating link 64 is connected to one end of the first link 65 in the ground container 103 . Also, one end of the second link 67, which is in the air, is connected to one end of the third link 68, which is also in the atmosphere.

Further, the main shaft 4 of the spring operation mechanism 400 is provided inside the operation box 104 . One end of a fourth link 69 is fixed to the main shaft 4 , and the other end of the fourth link 69 is connected to a third link 68 . The main shaft 4, the fourth link 69, the third link 68, the second link 67 and the rotating shaft 66 form a four-bar link mechanism.

Thereby, the spring operating mechanism 400 and the switching contacts (the fixed contact 62 and the movable contact 63) are mechanically connected.

An outline of the operation of the gas circuit breaker 100 configured in this manner will be described below. Note that the behavior of the spring operating mechanism 400 will be described separately.

In the gas circuit breaker 100 , in a normal state, electricity flows from an electric circuit in a substation or a switchyard through bushings 102 and is supplied to the system through bushings 101 .

When an accident occurs in the system due to a lightning strike or the like, a circuit opening command is input from the command center to the gas circuit breaker 100, and the spring operation mechanism 400 in the operation box 104 is driven to rotate the main shaft 4 counterclockwise. By separating the movable contact 63 from the fixed contact 62 via a four-bar link mechanism consisting of the main shaft 4, the fourth link 69, the third link 68, the second link 67 and the rotating shaft 66, cut off the power supply to

When the fault in the system is eliminated, a closing command is input to the gas circuit breaker 100 from the command center, and the spring operating mechanism 400 is driven to rotate the main shaft 4 clockwise to operate the link mechanism, and the movable contactor 63 is brought into contact with the fixed contact 62 to turn on the contact.

Although the earth container 103 extends horizontally in this embodiment, it may extend vertically. In this practical example, a single gas circuit breaker 100 in which bushings 101 and 102 are directly attached to a grounding container 103 is used for explanation. It may be a circuit breaker in the device.

Next, the configuration of the spring operating mechanism 400 in the gas circuit breaker of this embodiment will be described with reference to FIGS. 2 and 3. FIG. 2 shows a state in which the small housing 61 and mechanical parts are attached to the large housing 1, and FIG. 3 omits illustration of the large housing 1 and the small housing 61. FIG.

As shown in FIG. 2, the spring operating mechanism 400 in the gas circuit breaker 100 of this embodiment includes a tripping mechanism 401 that holds and releases the driving force of the main shaft 4 and the breaking spring 26 of the spring operating mechanism 400, and a cam of the cam 3. A large housing composed of a closing control mechanism 402 for holding and releasing the driving force of the shaft 2 and closing spring 28. The tripping mechanism 401 is inside the small casing 61, and the closing control mechanism 402 is larger than the small casing 61. 1 , and the small housing 61 is arranged inside the large housing 1 .

The small housing 61 is fixed by two surfaces perpendicular to the large housing 1, that is, two mounting surfaces 61a and 61b, and the fixing is performed by, for example, bolting.

The two surfaces orthogonal to the large housing 1 to which the small housing 61 is fixed, that is, the two mounting surfaces 61a and 61b are in the axial direction of the main shaft 4 of the spring operating mechanism 400 (perpendicular to the plane of the paper). direction) and a mounting surface 61a in the same direction as the axial direction of the main shaft 4 (perpendicular to the plane of the paper). It protrudes in the same direction as the axial direction of the main shaft 4 of the spring operating mechanism 400 (the direction perpendicular to the paper surface), and the projecting portion 1A extends in the axial direction of the main shaft 4 of the spring operating mechanism 400 (the direction perpendicular to the paper surface). ) and the mounting surface 1b perpendicular (horizontal direction) to the small housing 61 is installed.

In this embodiment, as shown in FIG. 3, the shape of each lever of the tripping mechanism 401 is different from that of the prior art, but the number of parts is the same. Although it was substantially Y-shaped, in this embodiment, it is made substantially L-shaped to reduce the size.

According to this embodiment, since the small housing 61 is arranged inside the large housing 1 without providing the small housing 61 outside the large housing 1, the operation shown in FIG. The size of the box 104 can be reduced, and the size of the spring operation mechanism 400 can be reduced.

In addition, since the small housing 61 is fixed to the large housing 1 by the two mounting surfaces 61a and 61b, the natural frequency of bending vibration of the small housing 61 is higher than in the prior art.

As a result, even if the impact at the end of the closing operation is transmitted to the small housing 61, the vibration of the second trigger lever 11 and the breaking trigger 14 is reduced, and the engagement between each roller and the lever is immediately stabilized. It is possible to stably perform the cutoff operation after the completion of the closing operation.

4, 5 and 6, the operation of the spring operation mechanism 400 of this embodiment shown in FIGS. 2 and 3, which is accommodated in the operation box 104 shown in FIG. 1, will be described.

FIG. 4 shows a state in which the closing spring 28 and the breaking spring 26 of the spring operating mechanism 400 are both compressed, and at this time the switching contacts shown in FIG. 1 are in the closed state. FIG. 5 shows a state in which an opening command is input to the gas circuit breaker 100, the spring operating mechanism 400 performs a breaking operation, and the breaking spring 26 is released. At this time, the opening/closing contacts shown in FIG. It is in. FIG. 6 shows a state in which a closing command is input to the gas circuit breaker 100 and the spring operating mechanism 400 performs a closing operation to release the closing spring 28 and compress the breaking spring 26. At this time, FIG. The switching contacts indicated by are in the closed state. After the state of FIG. 6, the closing spring 28 is compressed to return to the state of FIG.

As shown in FIGS. 4, 5 and 6, the housing for mounting the parts of the spring operating mechanism 400 is composed of the large housing 1 and the small housing 61 as described above. Arranged inside the large housing 1, the small housing 61 is fixed by two surfaces perpendicular to the large housing 1, that is, two mounting surfaces 61a and 61b. The fixation is for example made with bolts.

The spring operating mechanism 400 includes a tripping mechanism 401 that retains and releases the driving force of the main shaft 4 and the shutoff spring 26, a closing control mechanism 402 that retains and releases the driving force of the cam shaft 2 and the closing spring 28, and the like.

Next, the surroundings of the closing spring 28 and the structure of the closing control mechanism 402 will be described with reference to FIG.

As shown in FIG. 4, a cam 3 is attached to one end of a cam shaft 2 rotatably supported in a large housing 1, and a large gear 52 is attached to the other end. A spring receiver 35 is attached to the other end of the closing spring link 27 to hold one end of the closing spring 28 . The closing spring 28 is arranged on the outer periphery of the closing spring link 27 , and the opposite side of the spring bearing 35 is held by the large housing 1 .

Next, the structure of the closing control mechanism 402 will be described.

The closing control mechanism 402 is provided with a closing latch 19 that can be engaged with the cam roller 18 attached to the cam 3 . The closing latch 19 is rotatably supported, and a closing latch roller 21 is attached to the opposite side of the engaging portion of the closing latch 19 with the cam roller 18 .

The closing latch roller 21 is arranged so as to be able to contact the closing trigger 22 . The closing trigger 22 is rotatably attached to the large housing 1 . A plunger of the closing solenoid 301 is arranged so as to be able to contact the closing trigger 22 .

The structure around the breaking spring 26 and the tripping mechanism 401 will be described with reference to FIG.

As shown in FIG. 4, the main shaft 4 of the spring operating mechanism 400 is attached with the intermediate portion of a substantially Y-shaped main lever 5, and the two ends of the main lever 5 are provided with first main lever rollers. 6 and a roller 7 for the second main lever are mounted.

One end of a breaking spring link 25 is rotatably attached to the remaining end of the main lever 5 via a pin. A flange 34 is attached to the other end of the breaking spring link 25 and holds the breaking spring 26 arranged on the outer periphery of the breaking spring link 25 .

The shut-off spring 26 is held by the large housing 1 on the side opposite to the end held by the flange 34 . The breaking spring 26 moves the movable contact 63 from the fixed contact 62 via the main shaft 4, the fourth link 69, the third link 68, the second link 67, and the rotary shaft 66 via a four-bar link mechanism. It is configured to apply a driving force in the separating direction.

A cut-off latch 8 is rotatably attached to the large housing 1 . A slope formed at one end of the interception latch 8 is engaged with a second main lever roller 7 provided at one end of the main lever 5 , and an interception latch roller 10 is provided at the other end of the interception latch 8 . is installed. One end of a return spring (not shown) for returning the breaking latch 8 to its original position after the breaking operation is attached to the breaking latch 8 . The other end of this return spring is fixed to the large housing 1 .

A second trigger lever 11 is arranged so as to be able to engage with a roller 10 for shut-off latch provided at one end of the shut-off latch 8 . The second trigger lever 11 is rotatably attached to a shaft supported by the small housing 61 . One end of a return spring (not shown) is attached to the second trigger lever 11 for returning to the original position after the breaking operation.

A second trigger lever roller 13 is attached to the opposite end to which the second trigger lever 11 engages with the disconnecting latch roller 10 . A substantially L-shaped cut-off trigger 14 engageable with the second trigger lever roller 13 is arranged such that its tip portion abuts on the second trigger lever roller 13 .

The tip of the blocking trigger 14 is formed into a curved surface. The cut-off trigger 14 is rotatably supported by the small housing 61 . A plunger of a tripping solenoid 201 is arranged so as to be able to come into contact with the interrupting trigger 14 . A return spring (not shown) is attached to the intermediate portion of the cut-off trigger 14, one end of which is fixed to the small housing 61 and which returns the cut-off trigger 14 to its original position.

In this embodiment, these return springs are coil springs, but other springs such as torsion coil springs and disc springs may be used.

Thus, the breaking latch 8 forms a latch mechanism that holds the breaking spring 26 in a compressed state. Then, the compressed state of the breaking spring 26 is released by the second trigger lever 11, the breaking trigger 14, the tripping solenoid 201, and the like.

The principle of operation of the gas circuit breaker 100 of this embodiment constructed as described above will be described below.

First, the operation of the gas circuit breaker 100 shown in FIG. 4 to shift from the closed state to the interrupted state shown in FIG. 5 will be described.

In the closed state of the gas circuit breaker 100, when a shutdown command is input, the gas circuit breaker 100 starts a shutdown operation. The tripping solenoid 201 of the tripping operation mechanism 401 is energized, and the plunger protrudes upward to press the cut-off trigger 14 . As a result, the disconnection trigger 14 and the second trigger lever 11 are disengaged.

When the engagement with the disconnection trigger 14 is released and the second trigger lever 11 is free to rotate, the second trigger lever 11 is pressed by the disconnection latch roller 10 and rotates counterclockwise. Next, the shut-off latch 8, whose rotation was restricted, also becomes free to rotate, so that the pressing force of the main lever 5 from the second main lever roller 7 causes the shut-off latch 8 to rotate counterclockwise.

When the second main lever roller 7 of the main lever 5 is disengaged from the blocking latch 8, the main lever 5 is free to rotate. Then, the shut-off spring 26, which was in a compressed state, begins to be released, and the main lever 5 rotates counterclockwise.

As a result, the switching contacts (fixed contactor 62 and movable contactor 63) are connected by the four-bar link mechanism consisting of the main shaft 4, the fourth link 69, the third link 68, the second link 67, and the rotating shaft 66. is cut off. When the breaking spring 26 is completely released, the breaking operation is completed, and the first main lever roller 6 of the main lever 5 comes into contact with the outer peripheral surface of the cam 3 and stops, as shown in FIG.

Next, the operation of the spring operation mechanism 400 until the switching contact of the gas circuit breaker 100 shifts from the cut-off state to the closed state will be described.

In the cut-off state of the gas circuit breaker 100 shown in FIG. 5, when a closing command is input to the gas circuit breaker 100, the closing solenoid 301 is excited. The plunger of the closing solenoid 301 protrudes downward and presses the closing trigger 22 . Then, the closing trigger 22 rotates counterclockwise, and the engagement between the closing trigger 22 and the closing latch roller 21 is released.

The closing latch 19, whose rotation was restricted, becomes free to rotate, and the pressing force from the cam roller 18 of the cam 3 rotates the closing latch 19 counterclockwise. Then, the engagement between the closing latch 19 and the cam roller 18 is released. Since the rotation of the cam 3 is no longer restricted, the spring force of the closing spring 28 is released, the closing spring link 27 moves downward, and the large gear 52, the cam shaft 2 and the cam 3 rotate counterclockwise. start.

As the cam 3 rotates, the outer peripheral surface of the cam 3 comes into contact with the first main lever roller 6 of the main lever 5, and the main lever 5 rotates clockwise. When the cam 3 rotates approximately halfway, the outer peripheral surface of the cam 3 comes into contact with the first main lever roller 6 of the main lever 5 at the maximum curvature radius portion of the cam 3 . At this time, the breaking spring link 25 connected to the main lever 5 compresses the breaking spring 26 almost to its original position. When the closing spring 28 is completely released, the switching contacts (fixed contact 62 and movable contact 63) shown in FIG. 1 are closed.

At the end of the closing operation, the breaking latch 8, the second trigger lever 11, and the breaking trigger 14 of the tripping mechanism 401 are returned to their original positions by the force of the return spring.

After that, as shown in FIG. 6, the driving force a0 of the breaking spring 26 is transmitted to the breaking latch 8, the second trigger lever 11 and the breaking trigger 14 as the driving forces a1, a2 and a3. At this time, an impact acts between each roller and the blocking latch 8, the second trigger lever 11, and the blocking trigger 14, so that the large housing 1 and the small housing 61 are also subjected to the impact load.

In the operation duty of the gas circuit breaker 100, since there is a duty to start the breaking operation immediately after the closing operation is completed, the engagement between each roller and the breaking latch 8, the second trigger lever 11, and the breaking trigger 14 is immediately settled. It is desirable to prepare for the cut-off operation by

After the closing operation is completed, the large gear 52 is rotated counterclockwise by the motor and gear train (not shown), so that the closing spring link 27 swings counterclockwise and the closing spring 28 is compressed. . When the large gear 52 has passed approximately half a turn, the motor is stopped by a command from a limit switch (not shown).

The large gear 52 tries to rotate further counterclockwise by the driving force of the compressed closing spring 28, but the cam roller 18 of the cam 3 coaxial with the large gear 52 acts as the closing latch 19, and the closing latch 19 serves as the closing trigger. 22, the rotation of the cam 3 and the large gear 52 is prevented, and the spring force of the closing spring 28 is retained.

As a result, as shown in FIG. 6, the switching contacts (the fixed contact 62 and the movable contact 63) are brought into the closing and holding state, and the opening spring 26 and the closing spring 28 are returned to the initial state in which they are compressed.

In addition, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations. In addition, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Moreover, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

DESCRIPTION OF SYMBOLS 1... Large housing, 1A... Protrusion part of a large housing, 2... Cam shaft, 3... Cam, 4... Main shaft, 5... Main lever, 6... First main lever roller, 7... Second main lever roller 8... shut-off latch 10... roller for shut-off latch 11... second trigger lever 13... second trigger lever roller 14... shut-off trigger 18... cam roller 19... closing latch 21... closing Roller for latch 22 Closing trigger 25 Breaking spring link 26 Breaking spring 27 Closing spring link 28 Closing spring 34 Flange 35 Spring bearing 52 Large gear 61 Small housing , 61a, 61b... Mounting surface, 62... Fixed contact, 63... Movable contact, 64... Insulated link, 65... First link, 66... Rotating shaft, 67... Second link, 68... Third link , 69... Fourth link, 100... Gas circuit breaker, 101, 102... Bushing, 103... Grounding container, 104... Operation box, 105... Base, 201... Tripping solenoid, 301... Closing solenoid, 400... Spring operation mechanism , 401 ... tripping mechanism, 402 ... closing control mechanism.

Claims (8)

A grounding container in which an insulating gas is sealed and which has a built-in breaker having a fixed contact and a movable contact, a closing spring for opening or closing the movable contact with respect to the fixed contact, and At least a spring operation mechanism using an isolation spring as a driving source, a link mechanism connecting the spring operation mechanism and the movable contact, and a cam for converting the driving force of the closing spring into a force for compressing the isolation spring. prepared,
The spring operating mechanism comprises a tripping mechanism that holds and releases the driving force of the main shaft of the spring operating mechanism and the breaking spring, and a closing control mechanism that holds and releases the driving force of the shaft of the cam and the closing spring, A gas circuit breaker in which the tripping mechanism is housed in a small housing, and the closing control mechanism is housed in a large housing configured to be larger than the small housing,
The small housing is arranged inside the large housing , and the small housing is fixed on two surfaces orthogonal to the large housing,
The two surfaces orthogonal to the large housing to which the small housing is fixed are a plane perpendicular to the axial direction of the main shaft of the spring operating mechanism and a plane in the same direction as the axial direction of the main shaft. ,
A part of the wall surface of the large housing protrudes in the same direction as the axial direction of the main shaft of the spring operating mechanism. A gas circuit breaker characterized in that is installed . The gas circuit breaker according to claim 1 ,
The cam is attached to one end of the cam shaft rotatably supported in the large housing, and a large gear is attached to the other end of the cam shaft. A spring bearing is attached to hold one end of the closing spring, and the closing spring is arranged on the outer periphery of the link of the closing spring, and the opposite side of the spring bearing is the large housing. A gas circuit breaker characterized in that it is held by The gas circuit breaker according to claim 2 ,
The closing control mechanism is provided with a closing latch that is rotatable so as to be able to engage with the cam roller attached to the cam. is mounted with an on-latch roller, the on-latch roller is disposed so as to be able to abut on the on-trigger, and the on-trigger is rotatably attached to the large housing and attached to the on-trigger A gas circuit breaker, wherein a plunger of an on-solenoid is arranged so as to be able to contact the plunger. The gas circuit breaker according to any one of claims 1 to 3 ,
An intermediate portion of a substantially Y-shaped main lever is attached to the main shaft of the spring operating mechanism, and two ends of the substantially Y-shaped main lever are provided with a first main lever roller and a second main lever. A lever roller is attached, and one end of the link of the breaking spring is rotatably attached to the remaining end of the substantially Y-shaped main lever through a pin, and the link of the breaking spring is attached to the remaining end of the main lever. A flange is attached to the other end to hold the breaking spring arranged on the outer periphery of the link of the breaking spring, and the breaking spring has the large housing on the side opposite to the end held by the flange. A gas circuit breaker characterized by being held. The gas circuit breaker according to claim 4 ,
A blocking latch is rotatably attached to the large housing, and a slope is formed at one end of the blocking latch. and a breaker latch roller is attached to the other end of the breaker latch. The gas circuit breaker according to claim 5 ,
A second trigger lever is arranged so as to be able to engage with the breaking latch roller provided at one end of the breaking latch, and the second trigger lever rotates on a shaft supported by the small housing. A second trigger lever roller is attached to the opposite end of the second trigger lever from which the second trigger lever engages with the cut-off latch roller, and is engageable with the second trigger lever roller. A gas circuit breaker according to claim 1, wherein a circuit breaker trigger is disposed so that its tip portion abuts on the roller for the second trigger lever. The gas circuit breaker according to claim 6 ,
A distal end portion of the breaking trigger is formed into a curved surface, the breaking trigger is rotatably supported by the small housing, and a tripping solenoid plunger is arranged so as to be able to come into contact with the breaking trigger. A gas circuit breaker characterized by: The gas circuit breaker according to claim 7 ,
A gas circuit breaker, wherein the second trigger lever of the tripping mechanism is formed in a substantially L shape.

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