JP3304841B2 - Puffer type gas circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puffer type gas circuit breaker having a structure in which a compressed insulating gas is blown against an arc generated between a fixed electrode and a movable electrode to extinguish the arc.

[0002]

2. Description of the Related Art Conventionally, a fixed electrode and a movable electrode which are opposed to each other so as to freely contact and separate from each other are housed in a container filled with an insulating gas,
There is known a circuit breaker having a structure in which an insulating gas is compressed in conjunction with an opening operation of a movable electrode, and the compressed insulating gas is blown to an arc generated between the fixed electrode and the movable electrode to extinguish the arc. Have been.

For example, Japanese Patent Laid-Open Publication No. Sho 61-74223 discloses a circuit breaker having a puffer cylinder and a fixed piston which forms a puffer chamber together with the puffer cylinder, in addition to a fixed electrode and a movable electrode. I have.
That is, in this circuit breaker, during the opening operation, the puffer cylinder operates integrally with the movable electrode, so that the gas compressed in the puffer chamber passes through the passage provided on the fixed electrode side of the puffer cylinder and the fixed electrode and the movable electrode Sprayed during.

[0004] Such a circuit breaker is called a puffer type gas circuit breaker.

Japanese Patent Application Laid-Open No. 4-131131 discloses a link mechanism for driving a movable electrode of this puffer type gas circuit breaker. This circuit breaker has a structure in which the movable electrode is moved in the operation axis direction via a seal rod by rotation of a swing lever. At this time, the operation rotation angle of the swing lever passes through the rotation center of the swing lever and is divided into two by a line (hereinafter, referred to as a reference line) perpendicular to the operation axis of the movable electrode. Among the operation rotation angles of the swing lever, the operation rotation angle on the movable electrode side is set to 1.5 times or more the operation rotation angle on the other side.

In the latter circuit breaker, the driving force of the movable electrode portion is large in the first half of the opening stroke and small in the second half of the opening stroke by increasing the operating rotation angle on the movable electrode side. And the opening speed increases. Further, since the opening speed is increased, the inertia force of the movable portion in the latter half of the opening stroke is increased, and the pressure rise of the puffer portion during the interruption of the large current is increased, so that the large current interruption performance is improved.

[0007]

In a puffer type gas circuit breaker, it is necessary to generate a pressure of a predetermined value or more in a puffer portion for a predetermined time or more. For this purpose, the puffer cylinder, which operates integrally with the movable electrode,
It is necessary to drive so as to be decelerated in the latter half of the entire stroke in the opening operation. For this reason, in the conventional circuit breaker, a dash that acts on the link mechanism that drives the movable electrode so as to brake the opening operation of the movable electrode, that is, to decelerate the puffer cylinder that operates integrally with the movable electrode. Some have a pot.

However, in a configuration having a dashpot, the energy consumed for deceleration by the dashpot reaches several tens of percent of the total operation energy, and the dashpot for selecting or adjusting the dashpot for obtaining an appropriate deceleration can be obtained. There is a problem that it takes time and effort.

[0009] On the other hand, among the circuit breakers described in the above-mentioned publications, in the circuit breaker described in Japanese Patent Laid-Open No. 4-71131, the operating characteristics of the puffer cylinder are changed. However, this circuit breaker is designed to increase the acceleration in the first half of the opening stroke to increase the pressure rise in the puffer section. That is, even in this circuit breaker, no consideration is given to the deceleration operation of the puffer cylinder.

An object of the present invention is to provide a puffer type gas circuit breaker which can realize a deceleration operation of a puffer cylinder in the latter half of a stroke with a small operation energy.

[0011]

In order to achieve the above object, a puffer type gas circuit breaker according to the present invention has a fixed electrode, a movable electrode and a puffer cylinder, and is compressed in the puffer cylinder when the electrode is opened. A blocking unit configured to blow gas between the fixed electrode and the movable electrode, an operation unit that generates a driving force for driving the movable electrode, and the driving unit that is driven by the driving force of the operation unit to drive the movable electrode A puffer-type gas circuit breaker having a link mechanism, the link mechanism comprising: a first lever connected to the operation unit side; and a second lever connected to the blocking unit side.
The first lever is arranged around a line passing through a rotation center of the first lever and perpendicular to an operation axis direction of the operation unit.
Swings within an angle range of ± 30 degrees, and the second lever, when referred to a line that passes through the rotation center of the second lever and is perpendicular to the operation axis direction of the operation unit, In response to the swing of the first lever, the movable electrode swings in an angle range of 30 degrees or more and 90 degrees or less from the reference line in a direction to open the movable electrode. In order to achieve the above object, a puffer type gas circuit breaker of the present invention has a fixed electrode, a movable electrode, and a puffer cylinder,
A breaking unit configured to blow a gas compressed in the puffer cylinder between the fixed electrode and the movable electrode at the time of opening, an operation unit that generates a driving force for driving the movable electrode, In a puffer type gas circuit breaker including a link mechanism driven by a driving force to drive the movable electrode, the link mechanism is connected to a first lever connected to the operation unit side, and connected to the blocking unit side. Second
And the first lever swings within an angle range of ± 30 degrees around a line passing through the rotation center of the first lever and perpendicular to the operation axis direction of the operation unit,
The second lever corresponds to a swing of the first lever at the time of opening operation when a reference is made to a line passing through the rotation center of the second lever and perpendicular to an operation axis direction of the operation unit. ,
In the latter half of the stroke, the movable electrode swings in an angle range of 30 degrees or more and 90 degrees or less from the reference line in a direction to open the movable electrode. Further, in order to achieve the above object, the puffer type gas circuit breaker of the present invention,
A drive unit that has a fixed electrode, a movable electrode, and a puffer cylinder, and that is configured to blow gas compressed in the puffer cylinder between the fixed electrode and the movable electrode when the electrode is opened, and to drive the movable electrode. In a puffer-type gas circuit breaker including an operation unit that generates a driving force and a link mechanism that is driven by the driving force of the operation unit and drives the movable electrode, the operation unit includes a fluid pressure having a cylinder and a piston. A cylinder having a first lever connected to a shaft connected to the piston;
A second lever that moves in response to the movement of the first lever; and an insulating rod that connects the second lever to the movable part of the blocking unit. The first lever swings within an angle range of ± 30 degrees around a line passing through the rotation center of the first lever and perpendicular to the operation axis direction of the operation unit, and the second lever is rotated by the rotation center of the second lever. When the opening operation is performed, an angle range of 30 degrees or more and 90 degrees or less from the reference line to the opening direction of the movable electrode is used as a reference when a line perpendicular to the direction of the operation axis of the operation unit passes. It is configured to move. In order to achieve the above object, a puffer type gas circuit breaker of the present invention has a fixed electrode, a movable electrode, and a puffer cylinder,
A breaking unit configured to blow a gas compressed in the puffer cylinder between the fixed electrode and the movable electrode at the time of opening, an operation unit that generates a driving force for driving the movable electrode, In a puffer type gas circuit breaker including a link mechanism driven by a driving force to drive the movable electrode, the link mechanism is connected to a first lever connected to the operation unit side, and connected to the blocking unit side. Second
And the first lever becomes the center in the latter half of the stroke around a line passing through the center of rotation of the first lever and perpendicular to the operating axis direction of the operating portion during the opening operation. In the direction of opening the movable electrode from the line,
The second lever swings within an angle range of about 0 to 30 degrees, and the second lever is opened when a reference is made to a line passing through the center of rotation of the second lever and perpendicular to the operation axis direction of the operation unit. In the pole operation, in the second half of the stroke, the movable lever swings in an angle range of 30 degrees or more and 90 degrees or less from the reference line in the second half of the stroke in response to the swing of the first lever. It was done. Further, in order to achieve the above object, a puffer type gas circuit breaker of the present invention has a fixed electrode, a movable electrode, and a puffer cylinder, and a gas compressed in the puffer cylinder when the electrode is opened is movable with the fixed electrode. A blocking unit configured to spray between the electrodes, an operation unit that generates a driving force for driving the movable electrode, and a link mechanism that is driven by the driving force of the operation unit and drives the movable electrode. In a puffer type gas circuit breaker,
The link mechanism includes a first lever connected to the operation unit side, a second lever connected to the blocking unit side, and a third lever between the first lever and the second lever. And a plurality of shafts connecting between the levers,
The first lever is arranged around a line passing through a rotation center of the first lever and perpendicular to an operation axis direction of the operation unit.
Swings within an angle range of ± 30 degrees, and the second lever, when referred to a line that passes through the rotation center of the second lever and is perpendicular to the operation axis direction of the operation unit, In accordance with the swing of the first lever, the movable electrode swings in an angle range of 30 degrees or more and 90 degrees or less from the reference line in a direction to open the movable electrode. According to another aspect of the present invention, there is provided a method for adjusting a puffer type gas circuit breaker, comprising: a fixed electrode, a movable electrode, and a puffer cylinder. A blocking unit configured to be sprayed between the electrode and the movable electrode, an operation unit that generates a driving force for driving the movable electrode, and a link mechanism that is driven by the driving force of the operation unit and drives the movable electrode. In the adjusting method of the puffer type gas circuit breaker provided with, the link mechanism, a first lever connected to the operation unit side,
A second lever connected to the blocking portion side, a third lever between the first lever and the second lever, and a plurality of shafts connecting between the levers; 3
By changing the configuration of the lever and / or the shaft, the first lever can move by ± 30 degrees around a line passing through the center of rotation of the first lever and perpendicular to the operation axis direction of the operation unit. Swings within an angle range, and the second lever is moved relative to a line perpendicular to the operating axis direction of the operation unit through the center of rotation of the second lever. At least 30 degrees and 90 degrees from the reference line in the direction to open the movable electrode in response to the swing of the lever.
The angle is adjusted so as to swing in an angle range of degrees or less.

In the above means, when the second lever is referenced to a line passing through the rotation center of the second lever and perpendicular to the operating axis direction of the operating portion, the first lever swings during the opening operation. According to the movement, the movable electrode is swung in an angle range of 30 degrees or more and 90 degrees or less from the above-described reference line in a direction in which the movable electrode is opened, whereby a deceleration effect of the movable electrode can be obtained. At this time, if the second lever swings in the above-mentioned angular range in the latter half of the entire stroke of the movable electrode, the opening operation is quickly started, and the deceleration effect is obtained in the latter half of the stroke. Obtainable. Further, by providing the shaft connecting the third lever and each lever, it is possible to adjust the first and second levers so as to swing in a desired range without changing the configuration of the first and second levers. It will be easier.

In the present invention, the operating axis is a line imaginary in the respective operating directions of the movable section of the blocking section or the movable section of the operating section. To change the configuration of the third lever and / or the shaft connecting each lever means to change the length of the lever and the shaft, the initial position (angle), and the like. At this time, both the lever and the shaft may be changed, or one of the levers and the shaft may be changed when a plurality of the levers and the shafts are formed. Further, both the length and the initial position of the lever or the shaft may be changed, or one of them may be changed.

[0014]

FIG. 1 is a sectional view showing the structure of an embodiment of a puffer type gas circuit breaker according to the present invention.

The circuit breaker 1 according to the present embodiment controls the breaking unit 2, the operating unit 3, a link mechanism 4 for transmitting the driving force and stroke generated by the operating unit 3 to the breaking unit 2, and the driving of the operating unit 3. And a control box 5.

The structure of the blocking unit 2 will be described.

The shut-off section 2 includes a tank 100 in which an insulating tube 101, a hollow conductor 102 adjacent to the insulating tube 101, and a conductor 102
And an insulating tube 103 for supporting at zero. At this time, an insulating gas, for example, SF6 is sealed in the tank 100 and the insulating cylinder 101.

In the insulating cylinder 101, a fixed electrode 104 is provided.
A movable electrode 105 provided so as to be able to contact and separate from the fixed electrode 104; a puffer cylinder 106 provided to move integrally with the movable electrode 105; and a fixed piston 107 inserted into the puffer cylinder 106. Is provided. The fixed piston 107 is the puffer cylinder 10
6 and an outer peripheral surface of the movable electrode 105.

At this time, a puffer chamber 108 is formed by the inner wall surface of the puffer cylinder 106, the outer peripheral surface of the movable electrode 105, and the fixed piston 107. The puffer room 108
When the fixed electrode 104 and the movable electrode 105 are opened, the volume is reduced when the electrode is opened. At this time, the compressed gas becomes a discharge port to the fixed electrode 104 and the movable electrode 105 side so as to become a discharge port. Hole 109 is in puffer cylinder 10
6.

A nozzle 110 is fixed to the puffer cylinder 106 so that the gas discharged from the through hole 109 is blown to an arc generated between the fixed electrode 104 and the movable electrode 105.

The fixed electrode 1 of both ends of the movable electrode 105
The conductor 102 and the insulating cylinder 10
Insulating rod 111 penetrating through 3 is the center of rotation (pin)
It is connected so as to be rotatable around 1001. The insulating rod 111 is formed using an insulating material so as to have electrical insulation.

A conductor 112 from the outside of the cut-off section 2 is connected to the fixed electrode 104, and the movable electrode 105 is connected to the conductor 11
3 and electrically connected to the conductor 102 via the conductor 3. Further, the conductor 102 is electrically connected to the outside by the conductor 114.

Next, the structure of the operation unit 3 will be described.

The operating section 3 includes a cylinder 115a and a piston 1
Actuator 115 using a hydraulic cylinder consisting of 15b
The movement of the piston 115b in the direction of an imaginary axis (hereinafter referred to as the operation axis) is transmitted to the link mechanism 4 by the shaft 116 of the piston 115b. At this time, the shaft 116 is
May be a member integrally formed with the piston 1
It may be a separate member connected to 15b.

Next, the structure of the link mechanism 4 will be described.

The link mechanism 4 comprises an input lever 117 and an output lever 118 longer than the input lever 117. The input lever 117 and the output lever 118 are provided so as to be able to rotate (swing) about a common rotation axis (pin) 1002. At this time, the angle relationship between the input lever 117 and the output lever 118 is kept constant. Further, a shaft 116 is connected to an end of the input lever 117 opposite to the rotation axis 1002 so as to be rotatable about a rotation axis (pin) 1003. The end of the output lever 118 opposite to the rotating shaft 1002 is provided with an insulating rod 11.
1 is connected so as to be rotatable about a rotation shaft (pin) 1004.

In this embodiment, the axis imaginary for the operation direction of the movable electrode 105 (hereinafter, referred to as the operation axis) is horizontal, but it may be arranged so that this operation axis is vertical.

The operation of this embodiment will be described with reference to FIG.

FIG. 2 shows a fixed electrode 104 and a movable electrode 105.
Indicate a closed state (a) and an opened state (b).

The closed state (a), that is, stroke 0
In this state, the driving force (operating force) of the operating device 115 in the right direction in the drawing (the direction from the blocking unit 2 side to the operating unit 3 side) is transmitted to the input lever 117 by the shaft 116. The output lever 118 rotates around the rotation shaft 1002 by the same angle as the input lever 117 in the clockwise direction in the drawing, that is, in a direction to draw the insulating rod 111 toward the operation unit 3. At this time, the rotation shafts 1002 and 1
004 is the rotation axis 100 of the input lever 117.
Since it has a structure longer than the length between 2 and 1003, the stroke of the shaft 116 is expanded and transmitted to the insulating rod 111 side to drive the movable electrode 105.
Then, when the movable electrode 105 moves in the direction in which the opening is performed by the stroke L, the opening operation ends.

By this opening operation, the puffer chamber 108 is opened.
Reduces its volume and compresses the gas inside. The compressed gas is blown out from the through-hole 109 and is blown by the nozzle 110 to the arc generated between the fixed electrode 104 and the movable electrode 105, so that the arc can be extinguished and the current can be interrupted.

The closing operation is performed by the operating device driving the input / output lever and the insulating rod in the direction opposite to the opening.

Here, the stroke of the movable electrode during the opening operation will be described with reference to FIGS. FIG. 3 shows the relationship between the time and the moving distance when the movable electrode moves from the stroke 0 to L, and FIG. 4 is a diagram for defining the rotation angle of the input / output lever in this embodiment.

First, in FIG. 3, a curve 301 is a stroke curve when the movement of the movable electrode is decelerated in the latter half of the stroke L.
In order to extinguish the arc during the period 5, a stroking device capable of generating a pressure higher than a predetermined value for a predetermined time or more.
FIG. On the other hand, the curve 302 shows that the movement of the movable electrode is not decelerated in the latter half of the stroke L,
This shows a stroke curve with insufficient time to generate the required pressure.

In order to realize a stroke curve which causes a deceleration in the latter half of the stroke as indicated by 301, a technique of adding a dashpot for braking the movement of the movable electrode 105 has been conventionally known. However, the weight of the external dashpot is quite heavy, and the energy consumed by the dashpot is also considerable. Therefore, it is desired to make the dashpot unnecessary or to make the dashpot small in capacity. In this embodiment, by devising the structure of the link mechanism 4, a stroke curve that causes deceleration in the latter half of the stroke is realized.
This will be described below.

In general, in a conventional circuit breaker, the stroke of the operation unit 3 is enlarged and transmitted to the circuit breaker 2.
It has a link mechanism for conversion of the clock. At this time,
The angle formed by the input lever 117 connected to the operation unit 3 and the output lever 118 connected to the blocking unit is generally 0 ° or ± 90 °. In addition, each lever 1
The swing ranges (angles) of 17 and 118 are also symmetrical with respect to a line passing through the rotation axis of the lever and parallel to the operation axis of the movable electrode 105 and the puffer cylinder 106, or a line passing through the rotation axis of the lever and perpendicular to the operation axis. Moving (± θ is the same angle)
Is common.

Here, in this embodiment, the reference line 1005 (see FIG. 4) is defined as follows to define the swing angle of the lever.

The movable electrode 10 is connected via the insulating rod 111.
The output lever 118 connected to the reference numeral 5 is provided with a reference line in a direction passing through the center of rotation and perpendicular to the operation direction (operation axis) of the movable electrode 105. The input lever 117 connected to the operating device 115 via the shaft 116 is
A reference line is provided in a direction passing through the center of rotation and perpendicular to the operation direction (operation axis) of the piston 115b of the operating device 115.

In this embodiment, the reference lines of the output lever 118 and the input lever 117 are in the same direction.
005. Further, the input lever 117 and the output lever 118 pass through respective rotation centers and are perpendicular to respective reference lines (reference line 1005 in this embodiment), that is, the operation direction of the piston 115b of the operation device 115 or the operation of the movable electrode 105. It is rotationally driven on one side with a line imaginary in the direction as a boundary.

Accordingly, the position of each lever 117, 118 at a rotation angle of 0 ° is determined on the reference line 1005 on the side on which each lever 117, 118 is rotationally driven. The direction in which the levers 117 and 118 rotate from the reference line 1005 toward the operation unit (anti-blocking unit) is defined as the positive direction of the angle θ. At this time, the origin is the rotation center 1006 of each lever 117, 118.
And the xy coordinate system is determined as shown in FIG.
The y coordinate system is defined for each lever.) In this embodiment, the link mechanism includes the input lever 117 and the output lever 118.
However, as in the embodiment described later, a plurality of levers 7 are provided between the output lever 118 and the input lever 117.
01 and 702, the definitions regarding the reference line and the rotation angle are the same.

In the present embodiment, when the entire stroke L of the movable electrode 105 driven by the operating device 115 is divided into a first half and a second half by half, the input lever 117 is set to 0 on the previously defined coordinate system in the latter half. In addition to swinging in a range of not less than {30 °}, the output lever 118 is set to swing in an angle range of not less than 30 ° and not more than 90 ° on the coordinate system in the latter half. At this time, the upper limit of the angle range 90 ° is that the movable electrode 105
And because the puffer cylinder 106 moves in the opposite direction.

The swing angle of the lever and the linearity of the stroke at this time will be described with reference to FIG. The swing angle of the input lever 117 is set to 30 in the latter half of the full stroke of the operating device.
Therefore, the stroke (the tangential component of the arc due to the swing) of the latter half of the input lever 117 is substantially linear as shown in FIG. 5, and the deceleration is substantially zero. On the other hand, the output lever 118 has a non-linearity in the latter half of the stroke, so that a deceleration effect can be obtained.

When the input lever 117 swings within the range of -30 ° to 30 ° on the above-described coordinate system over the entire stroke L, the stroke becomes substantially linear over the entire stroke L and the shaft 116 is moved. The amount of displacement in the direction crossing the axial direction can be suppressed to a small value.
Therefore, it is desirable that the input lever 117 swings within the range of −30 ° to 30 ° on the coordinate system described above during the entire stroke L. At this time, if the input lever 117 is limited to swing in the range of 0 ° to 30 ° in the latter half of the stroke as in the present embodiment, a more ideal configuration is obtained.

The deceleration effect of the output lever 118 in the latter half of the stroke does not necessarily have to occur after a half of the total stroke, and the output lever 118 finally operates (oscillates) within a range of 30 ° or more. Move) to obtain the required deceleration effect. If the deceleration effect appears too early, the rise of the shut-off operation will be delayed. Therefore, in the present embodiment, the deceleration effect is obtained by limiting the operation to a range of 30 ° or more in the latter half of the stroke. Further, when the deceleration effect may appear later, the lever may reach a range of 30 ° or more and swing in the middle of the latter half of the stroke.

Here, the input lever 117 and the output lever 1
18 initial position, input lever 117 and output lever 118
The effective length relationship will be described with reference to FIG.

The angle between the input lever 117 and the output lever 118 is θ ₁₂ , the initial position of the input lever 117 is θ ₁ ,
The initial position of the output lever 118 is defined as θ ₂ . At this time, the separation distance between the electrodes is also an important parameter, and the stroke of the puffer cylinder is generally specified. If the strokes of the puffer cylinder 106 and the operating device 115 are SP and SO, respectively, and the effective lengths of the input lever 117 and the output lever 118 contributing to the respective strokes are L ₁ and L _2. , The total swing angle θ of the lever, and these must be set so as to satisfy the following relationship.

SP = L ₁ (sin (θ ₂ + θ) -sin θ ₂ ) (1) SO = SP · L ₁ / L ₂ (2) A second embodiment will be described.

FIG. 6 shows a second embodiment according to the present invention. In FIG. 6, the portion from the insulating rod 111 to the blocking section 2 is the same as in the first embodiment (FIG. 1), and is therefore omitted or simplified.

This embodiment is similar to the lever mechanism 4 of the first embodiment.
Are shown in multiple stages, and in particular, the embodiment is shown in two stages. The first-stage lever mechanism of the present embodiment includes a rotating shaft 160 on a shaft 116 on the operating device 115 side.
It has an input lever 117 rotatably connected to two turns, and a first intermediate lever 618 corresponding to the output lever of the first-stage lever mechanism. The intermediate lever 618 has the same rotation shaft 16 that rotates at a fixed relative angle to the input lever 117.
01, and one end of a connecting rod 601 is connected to the end opposite to the rotating shaft 1601. At this time, the intermediate lever 618 and the connecting rod 601 are
It is connected rotatably around 03. The other end of the connecting rod 601 is connected to an intermediate lever 617 corresponding to an input lever of a second-stage lever mechanism so as to be rotatable around a rotation shaft 1605.

In the following description, the input lever or the output lever is simply a lever connected to the shaft 116 or the insulating rod 111, respectively.

The second-stage lever mechanism includes a connecting rod 601.
And an intermediate lever 617 and an output lever 118 which are connected to a common rotation shaft 1604 so as to be rotatable at a constant relative angle.
The end of the insulative rod 111 is connected to the end of the rotating shaft 1604 at the end of the output lever 118 opposite to the side where the turning shaft 1604 is provided.
It is connected rotatably around 606.

Also in this embodiment, the effective length of the output levers 118 and 618 of each lever mechanism is determined by the input lever 11.
7,617 is longer than the effective length, and at least each lever mechanism is configured to expand the stroke.

In this embodiment, when the driving force is transmitted from the operating device 115 to the input lever 117 by the shaft 116, the stroke is expanded by the intermediate lever 618, and the driving force is transmitted to the second-stage intermediate lever 617. With the rotation of the intermediate lever 617, the output lever 118 also rotates around the rotation shaft 1604, and the driving force is transmitted to the insulating rod 111 by the output lever 118. Thereby, the movable electrode 105 and the fixed electrode 104 facing each other are separated.
(Opening) or binding (closing).

In this embodiment, first, the operating device 115
The initial positions of the input lever 117 connected to the shaft 116 and the output lever 118 connected to the insulating rod 111 are set in the same manner as the input lever 117 and the output lever 118 shown in the first embodiment. Then, with the initial position fixed, the angles and / or angles of the intermediate levers 617 and 618 with respect to the input lever 117 and the output lever 118 are changed.
Alternatively, adjustment (adjustment) is performed by changing the initial position so as to obtain an optimum deceleration effect in the latter half of the stroke. This makes it possible to obtain the optimal stroke characteristics of the puffer cylinder 106 that satisfies the arc extinguishing performance and minimizes the operation energy without changing or moving the operation device 115 side and the interruption unit 2 side. In this adjustment, the intermediate lever 61
The length of 7,618 may be changed.

If the first-stage intermediate lever 618 swings in the angle range of 30 ° to 90 ° in the latter half of the stroke similarly to the output lever 118, the deceleration effect of the puffer cylinder 106 is further increased. Alternatively, the intermediate lever 618 may swing in the range of −30 ° to 30 ° throughout the entire stroke, and the deceleration effect may be obtained only by the output lever 118. The second-stage intermediate lever 617 swings in the range of −30 ° to 30 ° throughout the entire stroke similarly to the input lever 117 so as to maintain linearity with the stroke of the first-stage intermediate lever 618. good.

In this embodiment, each intermediate lever 617,
The direction of the stroke required for 618 is the input / output lever 1
17 and 118, the input lever 117 and the intermediate lever 618 have the same reference line 1607.
, And the intermediate lever 617 and the output lever 118 have the same reference line 1608.

In this embodiment, the initial position of the input lever 117 and the output lever 618 is not changed, and
The initial position and the swing angle of 17, 618 are changed so as to obtain the optimum stroke characteristics of the puffer cylinder 106. At this time, the length of the connecting rod 601 is made constant or changed to obtain the optimum stroke characteristic. Set the appropriate conditions.

This embodiment is effective when a particularly large deceleration effect is required, for example, a spring-operated puffer type gas circuit breaker. It is also effective when the stroke characteristics of the operating device and the transfer characteristics of the system are unknown or when there are variations.

Further, according to this embodiment, the amount of work for adjusting the conventional dashpot can be reduced, and the process for assembling adjustment and the cost can be reduced.

FIGS. 7 and 8 show another embodiment of the initial position (angle) of the lever mechanism of the second embodiment (FIG. 6). In order for the swing range of the input lever 117 and the output lever 118 to satisfy the swing range described in the first embodiment, the relationship between the relative initial positions of the input lever 117, the output lever 118, and the intermediate levers 617 and 618 is required. As shown in FIG. 7 or FIG.

The above embodiment relates to the case where the operation axis of the movable electrode 105 and the operation axis of the operation section 3 are parallel to each other, as shown in FIGS. 9 (a) to 9 (d). The above-described embodiment can be applied to the case of crossing at a certain angle. That is, regarding the input lever 117,
Based on a line passing through the rotation center and perpendicular to the operation axis of the operation unit 3, the direction in which the movable electrode 105 is opened is set to be positive, and the swing range is set as in the above-described embodiment. Further, with respect to the output lever 118, the movable electrode 1 is determined with reference to a line passing through the center of rotation and perpendicular to the operating axis of the movable electrode 105.
Assuming that the opening direction of 05 is positive, the swing range is set as in the above-described embodiment. In FIG. 9, the configuration is simplified.

According to each of the above embodiments, the deceleration characteristic required for the stroke characteristic can be obtained and the arc extinguishing performance can be satisfied, so that the dashpot can be omitted. Accordingly, it is possible to reduce the damping energy, which has conventionally occupied several tens of percent of the operating energy, and the operating energy is greatly reduced.

[0063]

According to the present invention, it is possible to provide a puffer type gas circuit breaker which can realize the deceleration operation of the puffer cylinder in the latter half of the stroke with a small operation energy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a basic structure of a puffer type gas circuit breaker according to the present invention.

FIG. 2 is an explanatory diagram of a closed and open state of a puffer type gas circuit breaker.

FIG. 3 is a diagram for explaining a deceleration characteristic of a stroke of a puffer cylinder.

FIG. 4 is a definition diagram of an angle of a link mechanism.

FIG. 5 is a view for explaining the swing angle of a lever and the linearity and nonlinearity of a stroke.

FIG. 6 is a sectional view showing a basic structure of a puffer type gas circuit breaker according to a second embodiment of the present invention.

FIG. 7 is a diagram showing another configuration related to the initial position of the lever mechanism according to the second embodiment of the present invention.

FIG. 8 is a diagram showing another configuration related to the initial position of the lever mechanism of the second embodiment according to the present invention.

FIG. 9 is a diagram showing a simplified configuration of an embodiment in which the movable electrode and the operation axis of the operation unit intersect according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Circuit breaker, 2 ... Interruption part, 3 ... Operation part, 4 ... Lever mechanism, 5 ... Control box, 104 ... Fixed electrode, 1
05: movable electrode, 106: puffer cylinder, 107:
Fixed piston, 108: Puffer chamber, 109: Through hole,
110 ... nozzle, 111 ... insulating rod, 115 ... operator, 116 ... shaft, 117 ... input lever, 118 ...
Output lever, 601, connecting rod, 617, 618, middle lever.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-95278 (JP, A) JP-A-61-74223 (JP, A) JP-A-4-71131 (JP, A) 153459 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 33/28-33/59 H01H 33/91

Claims (5)

(57) [Claims] 1. A shutoff unit having a fixed electrode, a movable electrode, and a puffer cylinder, and configured to blow a gas compressed in the puffer cylinder between the fixed electrode and the movable electrode when the electrode is opened, In a puffer-type gas circuit breaker including an operation unit that generates a driving force for driving a movable electrode, and a link mechanism that is driven by the driving force of the operation unit and drives the movable electrode, the link mechanism includes the operation unit And a second lever connected to the blocking unit side, wherein the first lever passes through a rotation center of the first lever and operates along an operation axis of the operation unit. Swings within an angle range of ± 30 degrees around a line perpendicular to the direction, the second lever moves through a rotation center of the second lever and forms a line perpendicular to the operation axis direction of the operation unit. Open as reference In response to the swing of the first lever during operation, the movable electrode is swingable in an angle range of 30 degrees or more and 90 degrees or less from the reference line in a direction to open the movable electrode. Puffer type gas circuit breaker. 2. A shutoff unit having a fixed electrode, a movable electrode, and a puffer cylinder, and configured to blow gas compressed in the puffer cylinder between the fixed electrode and the movable electrode when the electrode is opened, In a puffer-type gas circuit breaker including an operation unit that generates a driving force for driving a movable electrode, and a link mechanism that is driven by the driving force of the operation unit and drives the movable electrode, the link mechanism includes the operation unit And a second lever connected to the blocking unit side, wherein the first lever passes through a rotation center of the first lever and operates along an operation axis of the operation unit. Swings within an angle range of ± 30 degrees around a line perpendicular to the direction, the second lever moves through a rotation center of the second lever and forms a line perpendicular to the operation axis direction of the operation unit. when a reference, the Very power
The pole moves in the opening direction by the stroke L due to the opening
In operation, the first lever is opened in response to the swing of the first lever.
The second half of the stroke in which the pole electrode moves in the opening direction
A puffer type gas circuit breaker , wherein the trokes L / 2 to L swing from an angle range of 30 degrees or more and 90 degrees or less from the reference line to the opening direction of the movable electrode. 3. A shutoff unit having a fixed electrode, a movable electrode, and a puffer cylinder, and configured to blow a gas compressed in the puffer cylinder between the fixed electrode and the movable electrode when the electrode is opened, In a puffer-type gas circuit breaker including an operation unit that generates a driving force for driving a movable electrode, and a link mechanism that is driven by the driving force of the operation unit and drives the movable electrode, the operation unit includes a cylinder and a piston. A hydraulic cylinder having a first lever connected to a shaft connected to the piston, a second lever that moves in response to the movement of the first lever, and a second lever that moves in response to the movement of the first lever.
And an insulative rod connecting the movable part of the blocking part to the movable part of the shut-off part. Swings within an angle range of ± 30 degrees, and the second lever is opened when a reference is made to a line passing through the rotation center of the second lever and perpendicular to the operation axis direction of the operation unit. A puffer-type gas circuit breaker, which is configured to swing in an angle range of 30 degrees or more and 90 degrees or less from the reference line in a direction to open the movable electrode during operation. 4. A shutoff unit having a fixed electrode, a movable electrode, and a puffer cylinder, and configured to blow a gas compressed in the puffer cylinder between the fixed electrode and the movable electrode when the electrode is opened, In a puffer-type gas circuit breaker including an operation unit that generates a driving force for driving a movable electrode, and a link mechanism that is driven by the driving force of the operation unit and drives the movable electrode, the link mechanism includes the operation unit A first lever connected to the first side, a second lever connected to the blocking portion side, a third lever between the first lever and the second lever, and a connection between each lever. With a plurality of shafts to be connected,
The first lever is arranged around a line passing through a rotation center of the first lever and perpendicular to an operation axis direction of the operation unit.
Swings within an angle range of ± 30 degrees, and the second lever, when referred to a line that passes through the rotation center of the second lever and is perpendicular to the operation axis direction of the operation unit, In accordance with the swing of the first lever, the movable electrode swings in an angle range of 30 degrees or more and 90 degrees or less from the reference line in a direction to open the movable electrode. Puffer type gas circuit breaker. 5. A shutoff unit having a fixed electrode, a movable electrode, and a puffer cylinder, and configured to blow a gas compressed in the puffer cylinder between the fixed electrode and the movable electrode when the electrode is opened, In an adjustment method for a puffer-type gas circuit breaker including an operation unit that generates a driving force for driving the movable electrode, and a link mechanism that is driven by the driving force of the operation unit and drives the movable electrode, the link mechanism includes: A first lever connected to the operation unit side, a second lever connected to the blocking unit side, a third lever between the first lever and the second lever, A plurality of shafts connecting the levers,
By changing the configuration of the third lever and / or the shaft, the first lever is moved around a line passing through the rotation center of the first lever and perpendicular to the operation axis direction of the operation unit. Swinging within an angle range of 30 degrees, wherein the second lever is based on a line passing through the rotation center of the second lever and perpendicular to the operation axis direction of the operation unit;
Adjusting so as to swing an angle range of 30 degrees or more and 90 degrees or less from the reference line in a direction to open the movable electrode in response to the swing of the first lever during the opening operation. A method for adjusting a puffer type gas circuit breaker, characterized in that: