WO2014118875A1

WO2014118875A1 - Switch device

Info

Publication number: WO2014118875A1
Application number: PCT/JP2013/051842
Authority: WO
Inventors: 康明青山; 小村　昭義; 一浦井; 勝彦白石; 陽一大下
Original assignee: 株式会社日立製作所
Priority date: 2013-01-29
Filing date: 2013-01-29
Publication date: 2014-08-07
Also published as: JP5883516B2; JPWO2014118875A1

Abstract

The present invention provides a switch device whereby reduction of a mass of an actuator is effected and it is possible to implement a rapid acceleration operation, as well as to effect improved reliability. A switch device according to the present invention comprises: an interruption part formed from a fixed contact and a mobile contact which either contacts or separates from the fixed contact; a linear motor which generates drive force for the mobile contact to operate; and a thrust generation source which supplies additional thrust to the linear motor when the linear motor accelerates, decelerates, or accelerates and decelerates, in the contact or separation of the interruption part.

Description

Switchgear

The present invention relates to a switchgear and, for example, to a switchgear suitable for an operation device that performs an open / close operation of a breaker such as a gas circuit breaker to electrically cut off a high voltage.

In general, power switchgears installed in substations and switchgears are circuit breakers that cut off current in the event of a short circuit in the power system, disconnectors that open and close the power system, and grounds that ground high-voltage conductors during inspections, etc. It has a switch. The circuit breaker, which is one of the switchgears, has a role of preventing accidents in the power system by promptly interrupting the accident current, and therefore development of a more reliable device is required.

As an operating device for operating such a circuit breaker, a spring operating device that obtains an operating force by releasing the spring force accumulated in the operating spring, or an operating force that uses air pressure or hydraulic pressure is obtained. Conventionally known pneumatic and hydraulic operating devices are known.

As for each of these operating devices, the spring operating device is excellent in low operating force, maintainability, and economy, and the pneumatic operating device is easy to handle and obtains high operating force. The operating device is characterized by low noise and high operating force.

However, in the operation by the spring operation device, there is room for improvement in the reliability of the operation because the elastic force of the spring is not necessarily constant, the positioning accuracy of the spring is low, and further, it is composed of many complicated parts. . In addition, in a pneumatic operating device or hydraulic operating device that uses hydraulic pressure or air pressure, the working fluid may leak due to expansion of the working fluid or damage to the sealing packing or the like depending on changes in ambient temperature. Furthermore, there is an aspect that even if one of the parts has a defect or a failure, the whole may not operate, and it is difficult to handle.

As a method for improving such a point, there is a technique for generating an operation force by the power of electricity. For example, Patent Document 1 discloses a technique that describes this technique. This Patent Document 1 describes an actuator structure that supplies a current to a linearly movable coil, and uses a magnetic field generated from a fixed cylindrical permanent magnet and an electron repulsive force due to the current density of the coil to A circuit breaker is described that linearly moves an insulating rod that leads to.

On the other hand, in

Patent Documents

2 and 3, magnetic pole teeth arranged on both sides of a permanent magnet via a gap, a core that continuously connects these magnetic pole teeth, and an armature winding wound around a plurality of magnetic pole teeth. A drive device is described that includes an armature having a plurality of permanent magnet arrays arranged so that magnetic poles are alternately arranged.

Further, Patent Document 4 describes a magnetic linear drive device that moves an open / close contact of a circuit breaker, and includes a first iron core having at least one magnetic gap that passes through a first coil that can be fed and is passed by a magnetic flux. And a movable contact having a first permanent magnet, wherein the first permanent magnet is supported by a compressed spring device (auxiliary device) and moved from a first terminal position.

Special Table 2007-523475 JP 2010-141978 A JP 2010-239724 A JP 2005-520517 A

By the way, in an actuator for a circuit breaker that requires high acceleration, it is necessary to reduce the mass of the movable body.

However, in the actuator structure described in Patent Document 1, the winding is an actuator in which the winding is movable, and in order to pass a large current, a winding with a large diameter is required, so the mass of the winding becomes large, Acceleration performance will decrease. In addition, since the winding itself is movable, it is necessary to supply a current to the winding serving as a movable body, and there is room for improvement in wiring handling and durability. From such various viewpoints, there is room for improvement in the reliability of Patent Document 1.

In addition, the contents described in

Patent Documents

2 and 3 are not intended to be used for a circuit breaker in the first place, and for a controller for a circuit breaker that requires high acceleration, the mass of the movable body is reduced. The reduction is not considered at all.

Furthermore, since the magnetic linear drive device described in Patent Document 4 has a structure in which a yoke is attached to the movable armature, the mass of the yoke is added to the mass of the movable part, and the responsiveness is lowered and cut off. Time may increase. In addition, the relationship between the current flowing through the first coil and the thrust acting on the movable armature changes depending on the position of the movable armature and the first iron core, making it difficult to control the thrust and generating vibration when the movable armature moves. Resulting in. Furthermore, depending on whether the yoke is in contact with the edge of the gap in the 1st iron core or not in contact, the magnetic resistance of the magnetic circuit changes greatly, which may cause vibrations, etc. The present invention has been made in view of the above points, and the object of the present invention is to reduce the mass of the operating device and realize high acceleration operation as well as to improve reliability. The object is to provide a switchgear.

In order to achieve the above object, the opening / closing device of the present invention includes a stationary contact and a blocking portion including a movable contact that contacts or separates from the fixed contact, and a drive for operating the movable contact. A linear motor that generates a force, and a thrust generation source that assists the linear motor in thrusting or decelerating or accelerating / decelerating the contact or opening of the blocking portion It is characterized by.

According to the present invention, the mass of the operating device can be reduced and high acceleration operation can be realized, and there is an effect that the reliability can be improved.

It is sectional drawing which shows the closing state of the circuit breaker which is Example 1 of the switchgear of this invention. It is sectional drawing which shows the open circuit state of the circuit breaker which is Example 1 of the switchgear of this invention. It is a perspective view which shows the structure of the linear motor employ | adopted as Example 1 of the switchgear of this invention. FIG. 3 is a perspective view showing a state in which the linear motor of FIG. 2 is cut in the YZ plane. It is a figure explaining the needle | mover of the linear motor shown in FIG. It is a figure equivalent to FIG. 2 which shows the path | route of the 1st magnetic flux of the linear motor employ | adopted as Example 1 of the switchgear of this invention, and the path | route of a 2nd magnetic flux. It is a figure equivalent to FIG. 3 which shows the path | route of the 1st magnetic flux of the linear motor employ | adopted as Example 1 of the switchgear of this invention, and the path | route of a 2nd magnetic flux. It is the figure which looked at FIG. 5 from the arrow P direction. It is the figure which looked at FIG. 6 from the arrow Q direction. It is a perspective view which shows the other structure of the linear motor employ | adopted as the opening / closing apparatus of this invention. FIG. 10 is a cross-sectional view showing the linear motor of FIG. 9 in a YZ plane. It is a perspective view of the near motor which shows the example which added the spring and the hook to the structure of FIG. FIG. 12 is a perspective view showing a cross section of the linear motor shown in FIG. 11 in the YZ plane. It is sectional drawing which shows the closing state of the circuit breaker which is Example 2 of the switchgear of this invention. It is sectional drawing which shows the opening state of the circuit breaker which is Example 2 of the switchgear of this invention. In the structure of the linear motor employ | adopted for the opening / closing apparatus of this invention, while arrange | positioning a spring between movable elements, it is a perspective view of the linear motor which shows the example which added the spring and the hook. FIG. 15 is a perspective view showing a cross section of the linear motor shown in FIG. 14 in the YZ plane. In the structure of the linear motor employ | adopted for the opening / closing apparatus of this invention, it is a perspective view of the linear motor which shows the example which has arrange | positioned the spring on both sides of the linear motor. It is an operation | movement pattern of the circuit breaker which is an example of the switchgear of this invention, and is a figure which shows the thrust characteristic of a spring. It is a figure which shows the thrust characteristic of the linear motor employ | adopted as the opening / closing apparatus of this invention. It is a figure which shows the characteristic which match | combined the thrust characteristic of said spring, and the thrust characteristic of a linear motor. It is a figure which shows the relationship between the thrust of the spring for compressing a spring by the displacement 0 from FIG.17 (c), and the thrust of a linear motor. It is a characteristic view which shows the example of the relationship between the time of a circuit breaker, and a displacement. It is an example of the thrust pattern of the linear motor and spring employ | adopted for this invention, and is a figure which shows the thrust pattern using an acceleration spring and a linear motor. It is a figure which shows the thrust pattern using the acceleration spring, the deceleration spring, and linear motor which are employ | adopted for this invention. It is a figure which shows a thrust pattern when an acceleration spring is made to act in the acceleration initial stage in the linear motor employ | adopted for this invention. It is sectional drawing which shows the closing state of the circuit breaker which used the hydraulic cylinder as a thrust generation source of the linear motor employ | adopted for this invention. It is sectional drawing which shows the opening state of the circuit breaker which used the hydraulic cylinder as a thrust generation source of the linear motor employ | adopted for this invention. FIG. 12 is a characteristic diagram showing a relationship between time and displacement when the hook is removed in the example shown in FIG. 11. FIG. 3 is a cross-sectional view showing a cross section of the armature of the linear motor shown in FIG. 2 in the XY plane.

Hereinafter, the switchgear of the present invention will be described based on the illustrated embodiment. In each embodiment, the same symbol is used for the same component.

1 (a) and 1 (b) show a gas circuit breaker that is Embodiment 1 of the switchgear of the present invention. FIG. 1A shows a closed state of the gas circuit breaker, and FIG. 1B shows an opened state of the gas circuit breaker.

As shown in the figure, the gas circuit breaker according to the present embodiment is roughly divided into a breaker (A) for breaking the accident current and an operation part (B) for operating the breaker (A). The

The blocking part (A) is fixed in an airtight metal container 1 filled with gas (for example, SF6 gas, air, etc.) and supported by an insulating support spacer 2 provided at the end of the airtight metal container 1. Side contact 3, movable side contact 4 that is disposed opposite to the fixed side contact 3 and contacts (closes) or opens (opens) the fixed side contact 3, and this movable side contact A nozzle 5 which is provided at the tip of the child 4 and which extinguishes the arc generated between the stationary contact 3 and the movable contact 4 by opening the arc by blowing an arc extinguishing gas to the operating portion (B) side. An insulating support cylinder 7 which is connected so as to cover the insulating rod 81 connected to the movable contact 4 and a main circuit conductor which is connected to the movable contact 4 and forms a part of the main circuit And a high voltage conductor 8.

And the interruption | blocking part (A) moves the movable side contactor 4 through the operating force from the operation part (B), and is electrically opened and closed, thereby supplying current (closing) and blocking (opening). Is done. Further, a current transformer 51 serving as a current detector for detecting a current flowing through the high voltage conductor 8 is provided around the high voltage conductor 8, and an operation unit (B An insulating rod 81 connected to the) side is arranged.

On the other hand, the operation unit (B) includes an operation device case 61 provided adjacent to the sealed metal container 1, a linear motor (operation device) 100 installed in the operation device case 61, and an operation device case 61. When the linear motor 100 is accelerated or decelerated or accelerated or decelerated when the stationary contact 3 and the movable contact 4 of the blocking portion (A) are in contact with or separated from each other, thrust is applied to the linear motor 100. A spring 90 that is an auxiliary thrust generation source, a mover 27 that is arranged inside the linear motor 100 and operates linearly inside the linear motor 100, and one end of the mover 27 and the spring 90 are fixed by bolts or the like. The movable portion 23 is generally configured.

And the movable part 23 is connected with the insulating rod 81 of the interruption | blocking part (A) through the linear seal part 62 provided so that it can drive, keeping the airtight metal container 1 airtight (the linear seal part 62 is insulated). The movement (axial movement) of the rod 81 is allowed, and the airtightness in the sealed metal container 1 is maintained). The insulating rod 81 is connected to the movable electrode 6, and the blocking portion (A) is operated through the operation of the linear motor 100 and the spring 90 that assists the linear motor 100 with thrust through the movable element 27 fixed to the movable portion 23. The movable electrode 6 can be operated.

Further, an amplifier 71 is connected to the linear motor 100, and the amplifier 71 is connected to the control unit 72. The amplifier 71 receives a command from the control unit 72 and supplies a current corresponding to the command to the linear motor 100. The current value detected by the current transformer 51 is input to the control unit 72, and the current value supplied to the linear motor 100 is controlled according to this current value, and the movable electrode 6 is moved via the movable element 27 and the movable part 23. Controls the position and speed.

Further, as described above, the spring 90 is disposed in the operation device case 61, and this spring 90 is connected to the movable element 27 of the linear motor 100 via the movable portion 23. When operating the linear motor 100, it is possible to supply the force by the thrust of the linear motor 100 and the thrust of the spring 90. Compared to the case of the single thrust of the linear motor 100, the capacity of the linear motor 100, the amplifier 71, etc. Can be reduced. Further, the position and speed can be controlled by the linear motor 100, and the reliability of current interruption is improved as compared with the conventional spring type actuator.

Next, the structure of the linear motor 100 will be described with reference to FIGS. The linear motor 100 in FIGS. 2 to 8 is an example of a three-phase driving linear motor. Note that the linear motor 100 is not limited to three-phase driving, and for example, two-phase driving or a multi-phase configuration of four or more phases is possible.

As shown in the figure, in the linear motor 100, three armatures 101 having windings 41 arranged at positions facing the permanent magnets 21 are arranged in the traveling direction (Z direction) of the permanent magnets 21. As shown in FIG. 3, a plurality of permanent magnets 21 are arranged in the Z direction and are arranged so that the magnetization directions 25 are alternated. A first magnetic pole tooth 11 and a second magnetic pole tooth 12 are arranged so as to sandwich the permanent magnet 21 from above and below, and the magnetic flux is formed by connecting the first magnetic pole tooth 11 and the second magnetic pole tooth 12 with a magnetic body 13. Form the path. A winding 41 is wound around each of the first magnetic pole teeth 11 and the second magnetic pole teeth 12.

As shown in FIG. 4, the permanent magnet 21 is fixed to a ladder-like movable member 28, and the permanent magnet 21 and the movable member 28 constitute a movable element 27. The mover 27 is maintained in a positional relationship with the armature 101 by a support mechanism (not shown). For example, linear guides, roller bearings, cam followers, thrust bearings, and the like are preferable, but the present invention is not limited to this as long as the distance between the permanent magnet 21 and the first magnetic pole teeth 11 and the second magnetic pole teeth 12 can be maintained. Moreover, it is also possible to provide a support mechanism in the operation device case 61 and the sealed metal container 1 shown in FIG.

Usually, an attractive force (force in the Y direction) is generated between the permanent magnet 21 and the first magnetic pole teeth 11 and the second magnetic pole teeth 12. However, in the configuration of this embodiment, the permanent magnet 21 and the first magnetic pole teeth 11 are the same. The attraction force generated in the magnetic pole teeth 11 and the attraction force generated in the permanent magnet 21 and the second magnetic pole teeth 12 are generated with each other, and the forces are canceled out to reduce the attraction force.

Therefore, the mechanism for holding the mover 27 can be simplified, and the mass of the movable body including the mover 27 can be reduced. In addition, since the mass of the movable body can be reduced, high acceleration driving and high response driving can be realized. Further, since the armature 101 and the permanent magnet 21 are driven in the Z direction relatively, the armature 101 is fixed, and the mover 27 including the permanent magnet 21 moves in the Z direction. On the other hand, it is possible to fix the mover 27 and move the armature 101 in the Z direction. In this case, the mover 27 and the armature 101 are reversed. The force generated is a relative force generated between the two.

When driving the linear motor 100, a magnetic field is generated by passing a current through the winding 41, and a thrust according to the relative position of the armature 101 and the permanent magnet 21 can be generated.

Further, the linear motor 100 of the present embodiment forms two different magnetic paths through which the

magnetic fluxes

91 and 92 generated by the

windings

41a and 41b pass, as shown in FIGS.

That is, as shown in FIG. 7, one of two different magnetic paths through which the

magnetic fluxes

91 and 92 generated by the

windings

41a and 41b pass is that the magnetic flux 91a generated by the winding 41a is the first magnetic pole teeth 11a, This is a first path that passes through the magnetic body 13a and the magnetic body 13c and reaches the second magnetic pole tooth 12a. As shown in FIG. 7, the other path is that the magnetic flux 92a generated by the winding 41a and the winding 41b is converted into the first magnetic pole tooth 11a, the magnetic body 13a, the first magnetic pole tooth 11b, and the second magnetic pole tooth 12b. This is a second path that passes through the magnetic body 13c and reaches the second magnetic pole teeth 12a. That is, in one of the two different magnetic paths, the magnetic flux 91 from the

windings

41 a and 41 b is changed from the magnetic body 13 to the first magnetic pole tooth 11, from the first magnetic pole tooth 11 to the second magnetic pole tooth 12, and second. The other magnetic path is a direction in which the magnetic flux 92 from the

windings

41a and 41b is orthogonal to the first path (the traveling direction of the permanent magnet 21). (Z direction)) and the second path to the magnetic pole teeth adjacent to the moving direction of the mover 27.

More specifically, the second path through which the magnetic flux 92 passes is, as shown in FIG. 6, wound between the first magnetic pole teeth 11 on the upper side of the armature 101 adjacent to the moving direction of the mover 27. Magnetic flux 92 from the

wires

41a and 41b flows through the magnetic body 13 and flows to the second magnetic pole teeth 12 on the lower side of the armature 101, and the magnetic flux passes between the second magnetic pole teeth 12 on the lower side. 92 becomes a circulation path which flows through the magnetic body 13.

With this configuration, the magnetic flux from the

windings

41a and 41b passes through the first and second paths, the cross-sectional area of the path of the magnetic flux increases, and thrust can be generated efficiently. .

Also, by controlling the positional relationship between the armature 101 and the permanent magnet 21 and the phase and magnitude of the injected current, the magnitude and direction of the thrust can be adjusted. The operation control of the mover 27 is performed by supplying current from the amplifier 71 to the linear motor 100 according to the case where the opening command and the closing command are input to the control unit 72, and driving the mover 27 by the linear motor 100. This can be done by converting to force.

1A and 1B, the linear motor 100 and the spring 90 drive the movable electrode 6 through the movable portion 23 and the insulating rod 81. That is, in FIG. 1A, the movable electrode 6 is in a closed state, and when driving from this state to the open state in FIG. 1B, the linear motor 100 drives through the movable element 27. The movable electrode 6 can be opened by assisting the force with the tensile force (thrust) of the spring 90. Further, in order to change from the open state of FIG. 1B to the closed state of FIG. 1A, a compressive force in which the spring 90 is compressed by a driving force through the mover 27 by the linear motor 100. The movable electrode 6 can be brought into a non-polar state by assisting the thrust generated by releasing.

By doing in this way, in order to perform the high acceleration operation of the gas circuit breaker, the mass of the operation device can be reduced and the high acceleration operation can be realized without increasing the size of the operation device.

The spring 90 assists the thrust by releasing the compression force when driving from the closed state to the open state, and assists the tensile force when driving from the open state to the closed state. It doesn't matter.

Further, the position of the movable element 27 is detected by a position detection device (not shown), and the thrust of the spring 90 is estimated by the control unit 72 based on the detected position information, so that the thrust of the linear motor 100 is controlled.

As shown in FIG. 3, the magnetic pole teeth of the three armatures 101 are arranged such that six magnetic pole teeth of the armature 101 are aligned with respect to five permanent magnets 21 aligned in the Z direction. As described above, the vibration can be reduced by shifting the magnetic pole teeth of the armature 101 in the Z direction with respect to the permanent magnet 21. Further, the structure in which the permanent magnet 21 is sandwiched between the first magnetic pole teeth 11 and the second magnetic pole teeth 12 can reduce the blurring of the mover 27.

Therefore, even if linear driving is performed, vibration and vibration in the driving direction (Z direction) and the vertical direction (X direction and Y direction) become extremely small. That is, when applied to a gas circuit breaker, even if a mover that transmits an operating force passes through the straight seal portion 62, the deformation of the straight seal portion 62 is small, so that the mechanical burden on the seal portion is reduced. This leads to not only the sliding operation failure of the linear seal portion 62 due to driving but also the prevention of the tilt of the movable contact 4, so that the contact sliding portion is galling and minute metallic foreign matter from the electrode is generated. It becomes a structure difficult to do. The galling may lead to malfunctions of shut-off and throwing in, and the metal foreign matter may lead to an insulation accident due to a decrease in insulation performance. Moreover, the amount of SF6 gas inside the gas circuit breaker due to seal deformation leaking to the outside can be reduced.

As described above, according to the configuration of the present embodiment, the mass of the operating device can be reduced, and high acceleration operation can be realized, as well as the effect of improving the reliability.

9 to 13 (a) and 13 (b) show a gas circuit breaker that is Embodiment 2 of the switchgear of the present invention. In the present embodiment, the description of the portions having the same functions as those of the configurations denoted by the same reference numerals as those described in the first embodiment is omitted.

The present embodiment shown in the figure is an example in which the permanent magnet 21 of the linear motor 100 is configured in two upper and lower stages. The linear motor 100 of the present embodiment will be described for the case of three-phase driving.

As shown in FIGS. 9 to 13A and 13B, in the linear motor 100 of this embodiment, three armatures 101 are arranged in the Z direction so as to sandwich the rows of the upper and lower permanent magnets 21. The 1st magnetic pole tooth 11 and the 2nd magnetic pole tooth 12 are arrange | positioned. The

windings

41a and 41b are wound so that the magnetic flux 26 created by the winding 41b is opposite to the magnetic flux direction 26 created by the winding 41a arranged in the Y direction.

FIGS. 11 and 12 show examples of linear motors in which the linear motor 100 shown in FIGS. 9 to 10 and the spring 90 are combined.

As shown in the figure, in this embodiment, metal fittings 30 are attached to both ends of the linear motor 100 in the axial direction. Two metal-shaped movable portions 23 having a cylindrical shape are attached to the metal fitting 30, and a spring 90 is disposed between the two movable portions 23. The movable part 23 of the linear motor 100 includes a permanent magnet 21, a movable member 28, and reinforcing

members

31 and 32 that reinforce the Z direction and the X direction of the movable member 28.

In addition, the movable part 23 of the linear motor 100 is disposed inside the spring 90. For example, by arranging the movable part 23 of the linear motor 100 and the spring 90 on the same axis, vibration and vibration can be reduced, so that reliability is improved. improves. Furthermore, the rigidity is improved by increasing the secondary moment of section of the movable portion 23 by adding the reinforcing member 31 and by connecting the two-stage movable element 27 by the reinforcing member 32. As a result, since the deformation and buckling of the mover 27 can be suppressed, the reliability is further improved.

Furthermore, by providing a positioning hole 33 in the center of the movable portion 23 and arranging a shaft and a bearing in the positioning hole 33, it is possible to reduce the shake and vibration of the movable portion 23.

Also, a hook 29 is provided to hold the spring 90 in a compressed state. The hook 29 is fixed to one of the movable parts 23 and is engaged with the other movable part 23 in a compressed state of the spring 90, and the compression of the spring 90 is released by releasing the engagement. It is. Thereby, even when there is no current supply to the linear motor 100, the position of the movable part 23 and the spring 90 can be held. In addition, by manually removing the hook 29, the movable portion 23 can be moved by the thrust of the spring 90.

FIG. 13 (a) and FIG. 13 (b) show a gas circuit breaker that employs the linear motor 100 described above.

As shown in the figure, the gas circuit breaker employing the above-described linear motor 100 is arranged in two stages so that the movable element 27 can move the linear motor 100 with respect to one insulating rod 81, and the movable portion 23. Both are connected via A spring 90 is disposed between the linear motor 100 and the movable portion 23 so as to surround the two-stage movable element 27.

Even in the configuration of the present embodiment, the same effects as those of the first embodiment can be obtained. For example, by arranging the movable element 27 symmetrically with respect to the operating axis of the insulating rod 81, the moment Can be reduced, and the operation of the insulating rod 81 is stabilized.

14 and 15 show a third embodiment of the present invention. In the present embodiment, the description of the portions having the same functions as those of the configurations denoted by the same reference numerals as those described in the first and second embodiments is omitted.

The present embodiment shown in the figure is an example in which a spring 90 is disposed between the upper and lower movable elements 27. That is, the spring 90 is positioned by the positioning shaft 36 between the metal fitting 30 and the reinforcing member 32 and between the upper and lower two-stage movable element 27. One end of the hook 29 is fixed to the metal fitting 30 and the other end is engaged with the reinforcing member 32 in a state where the spring 90 is compressed, and the compression of the spring 90 is released by releasing this engagement. It has become.

Even with this configuration of the present embodiment, the same effects as in the second embodiment can be obtained, and the possibility that foreign matter is caught in the spring 90 is reduced, and problems due to foreign matter caught in the spring 90 are prevented. it can. Further, the positioning shaft 36 is installed inside the spring 90, the bearing 35 can be attached to the reinforcing member 32, and the movement and vibration of the mover 27 can be suppressed.

Further, as shown in FIG. 14, a scale 39 is attached to the side surface of the reinforcing member 31, a scale signal of the scale 39 is read by the position detector 34, and this is read as position information of the linear motor 100 by the amplifier 71 and the control unit 72. introduce. At this time, if the distance between the scale 39 and the position detection device 34 changes, an error may occur when reading the position signal. Therefore, as shown in FIG. 13, by installing the positioning shaft 36 and the like, blurring of the mover 27 can be reduced, and the reading error can be reduced.

16 and 17 (a) to 17 (d) show a fourth embodiment of the present invention. In the present embodiment, the description of the portions having the same functions as those of the configurations denoted by the same reference numerals as those described in the first and second embodiments is omitted.

As shown in FIG. 16, this embodiment is an example in which springs 90 are provided on both sides of the linear motor 100 in the axial direction. In other words, the metal fittings 30 are attached to both ends of the linear motor 100 in the axial direction, and two columnar movable parts 23 having a cylindrical shape are attached to the metal fitting 30. The spring 90 is disposed between the two movable parts 23.

Even in the configuration of the present embodiment, the same effects as those of the second embodiment can be obtained, and the operating range of the spring 90 can be adjusted by providing a mechanical or electrical mechanism, It is also possible to operate as a brake force of the mover 27 by arranging the spring 90.

17A, 17B, 17C, and 17D, an example of an operation pattern of the gas circuit breaker in the present embodiment will be described. In all the drawings, the horizontal axis represents the displacement of the movable electrode, and the vertical axis represents the thrust.

FIG. 17 (a) shows the thrust characteristics of the spring 90. FIG. The thrust characteristic of the spring 90 changes depending on the displacement. The thrust during compression of the spring 90 is FS. When the spring 90 is operated, a thrust is obtained in the range of the region 601 in FIG.

The thrust of the linear motor 100 is shown in FIG. Since the linear motor 100 can change the direction of the thrust by changing the sign of the current, the thrust can be controlled in the range of −FL (region 603) to FL (region 602). If the positive direction of displacement is the opening direction of the gas circuit breaker, an acceleration force is obtained in the region 602 and a braking force is obtained in the region 603 at the time of opening. The thrust characteristics combining the spring 90 and the linear motor 100 are as shown in FIG. The thrust characteristics obtained by the spring 90 and the linear motor 100 are in the range of the region 604.

When the positive direction of displacement is the opening direction of the gas circuit breaker, as shown in FIG. 17 (d), the braking force in the region 605 operates during opening. On the other hand, when moving in the negative direction of displacement (closed direction), the compression operation of the spring 90 is required, so that the acceleration force in the region 605 is obtained. Therefore, in order to compress the spring 90 to zero displacement, it is necessary to satisfy FL> FS.

In addition, in the conventional spring type operation device, a motor for compressing the spring is separately required. However, in the linear motor 100 and the operation device of the spring 90 in this embodiment, the compression of the spring 90 is performed by the linear motor 100. It becomes possible. Further, a mechanism for changing the rotation operation of the motor to a spring compression operation is not necessary, and the reliability can be improved and the size can be reduced by reducing the number of parts.

An example of the relationship between the time and displacement of the gas circuit breaker is shown in FIG. As shown in the figure, the gas circuit breaker moves from P0 to P2 from the start of operation to t2. Therefore, acceleration is required in the first half of the time, and deceleration operation is required in the second half. Therefore, by changing the operating range of the spring 90 and the thrust of the linear motor 100 between the first half of the time and the second half of the time, a stroke suitable for the gas circuit breaker can be obtained. For example, in the linear motor 100 according to the fourth embodiment shown in FIG. 16, the spring 90 installed on the left side is operated as an acceleration spring, and the spring 90 installed on the right side is operated as a deceleration spring, whereby the capacity of the linear motor 100 and the spring 90 is increased. Low capacity.

19A, 19B and 19C show thrust patterns of the linear motor 100 and the spring breaker. FIG. 19A shows a thrust pattern using an acceleration spring and a linear motor, and FIG. 19B shows a thrust pattern using an acceleration spring, a deceleration spring, and a linear motor.

In FIG. 19A, in the range of displacement 0 to displacement X1, the thrust FS1 of the spring 90 obtained from the energy of the spring 90 (region 601) and the linear motor 100 obtained from the energy of the linear motor 100 (region 602). It moves using the thrust FL1. In the range from the displacement X1 to the displacement X2, the vehicle is decelerated using the thrust FL2 of the linear motor 100 using the energy (region 605) obtained by regeneration of the linear motor 100. For example, it is assumed that the speed at which the displacement is 0 is set to 0, the acceleration is performed up to the displacement X1, the deceleration is started in the region exceeding the displacement X1, and the operation is stopped at the displacement X2. Assuming that the effects of motor loss, friction, etc. are ignored, the energy used for acceleration (sum of region 601 and region 602) and the energy used for deceleration (region 605) are equal. For example, in the case of X1 = X2, the energy required for acceleration and deceleration is equal, so that there is no action of the spring 90 during deceleration, so the deceleration energy supplied by the linear motor 100 increases, and the linear motor 100 The capacity increases and FL1 <FL2. Since the capacity of the linear motor 100 is determined by thrust, the capacity is determined by the larger of FL1 or FL2.

Therefore, as shown in FIG. 19 (b), by using a deceleration spring that acts between the displacements X1 and X2, it becomes possible to equalize the thrust FL1 during acceleration and the braking force FL2 during deceleration. The capacity of the motor 100 can be reduced.

Furthermore, the operation of the gas circuit breaker may require acceleration in the region of more than half of the total displacement. At this time, X1> X2, and it is necessary to increase the thrust (FL2 + FS2) during deceleration compared to the thrust (FL1 + FS1) during acceleration. When displacement 0 to X1 is accelerated by the thrust FS1 of the spring (1) and the thrust FL1 of the linear motor 100, and the movement from the displacement X1 to X2 using the thrust FS2 of the spring (2) and the thrust FL2 of the linear motor 100 is decelerated. By providing the spring (2) that acts sometimes, the thrust FL1 of the linear motor 100 during acceleration and the thrust FL2 of the linear motor 100 during deceleration can be designed to be equivalent, and the capacity of the linear motor 100 can be reduced. It becomes. By setting FS1 <FS2 in X1> X2, the capacity of the linear motor 100 during acceleration and deceleration can be set appropriately.

Fig. 19 (c) shows the thrust pattern when the acceleration spring is applied in the early stage of acceleration. For example, the range in which the spring 90 acts can be changed as necessary. When the thrust characteristics of the first half of acceleration and the second half of acceleration are greatly changed, the spring 90 and the linear motor 100 in the early stage of acceleration, and the linear motor 100 in the second half of acceleration. By accelerating with this thrust, it becomes possible to speed up the speed.

Thus, by changing the operating range of the spring 90, it is possible to realize stroke characteristics suitable for the operation of the gas circuit breaker.

FIG. 20 (a) and FIG. 20 (b) show a fifth embodiment of the present invention. In the present embodiment, the description of the portions having the same functions as those of the configurations denoted by the same reference numerals as those described in the first embodiment is omitted.

In this embodiment shown in the figure, a hydraulic cylinder 37 is used in place of the spring described in the above-described embodiment. That is, the piston 38 of the hydraulic cylinder 37 is connected to the movable part 23. Other configurations are the same as those in FIGS. 1A and 1B.

Even with this configuration of the present embodiment, the same effects as those of the first embodiment can be obtained. The thrust generation source for assisting acceleration and deceleration of the movable portion 23 is not limited to the spring 90 and the hydraulic cylinder 37, and the acceleration / deceleration of the movable portion 23 is supplemented by the linear motor 100 and other thrust generation sources. By doing so, the same effect can be obtained.

Example 6 of the present invention will be described with reference to FIGS. In the present embodiment, the description of the portions having the same functions as those of the configurations denoted by the same reference numerals as those described in the first embodiment is omitted.

As shown in FIG. 11, the second embodiment includes a linear motor 100, a spring 90 that assists thrust during acceleration / deceleration, and a hook 29 that holds the compression force of the spring 90. In a conventional spring breaker, the compression force of the spring is held by a hook, and a strong hook is required according to the compression force of the spring. At the same time, the hook is damaged by the force and friction when removing the hook. To do.

In the configuration of this embodiment, when the hook 29 is removed, the linear motor 100 is operated in the direction opposite to the acceleration direction and the hook force is loosened, so that the force on the hook 29 can be reduced.

21 shows the relationship between time and displacement when the hook 29 is removed. As shown in the figure, the movement from the position of the displacement P0 to P1 in the direction opposite to the movement direction, the hook force is loosened, the hook 29 is removed, and the movement to P2 causes damage to the hook 29 due to force and friction. Can be greatly reduced. It is also possible to set the hook force to 0 at the position P1 and hold it by the thrust of the linear motor 100, the frictional force of each part, the detent force of the linear motor 100, or the like. This reduces the frequency of friction and breakage of the hook 29 and improves the reliability of the gas circuit breaker.

In addition, the structure shown in Example 1 thru | or Example 6 of this invention has the thrust generation source which assists the linear motor 100 and acceleration / deceleration, and the linear motor 100 controls thrust freely within a stroke. Because of this, the stroke characteristics of the gas circuit breaker can be controlled. Thereby, the arc which generate | occur | produces in a movable electrode or the electrode of a interruption | blocking part can be suppressed, and it leads to the reliability improvement of a gas circuit breaker.

In the above-described embodiment, the point of action of the thrust generated by the mover 27 or the point of action of the resultant force of the thrust, and the point of thrust of the spring 90 that assists the thrust when the mover 27 is accelerated, decelerated, or accelerated / decelerated. And is on the same axis. This will be described below.

In the combination of the spring 90 and the linear motor 100 shown in FIG. 1B, the mover 27 of the linear motor 100 has a one-stage configuration, the axis on which the thrust of the linear motor 100 acts is (c), and the thrust of the spring 90 acts. Assuming that the shaft to be operated is (A), if the thrust of the linear motor 100 and the thrust of the spring 90 are made equal, the resultant force of the thrust of the linear motor 100 and the thrust of the spring 90 is intermediate. Further, if there is a thrust difference, the shaft on which the resultant force acts is slightly shifted, but considering that the linear motor 100 compresses the spring 90 (the thrust of the linear motor 100≈the thrust of the spring 90), the two are almost the same. . Therefore, by arranging the acting axis (A) of the resultant force of the spring 90 and the linear motor 100 and the axis (d) on which the movable electrode 6 moves on the same axis, it is possible to reduce wear and burden on the link part and the seal part.

FIG. 13A is an example in which the axis (v) on which the resultant force of the two-stage movable element 27 acts and the axis (f) on which the movable electrode 6 moves are arranged on the same axis. As described above, by arranging the shafts that generate the resultant force on the plurality of thrust generation sources on the same axis as the axis on which the movable electrode 6 moves, it is possible to reduce wear and burden on the link portion and the seal portion.

In FIG. 12, even when the axis (g) where the thrust of the spring 90 is generated and the axis (g) where the resultant force of the plurality of movers 27 is generated are coaxial, the thrust of the spring 90 and the linear motor 100 is not equivalent. This has the effect of reducing the wear and load on the link and seal.

The following is an additional description of the linear motor 100 used in the present invention. For example, FIG. 22 shows a view of the armature 101 of the linear motor 100 shown in FIG.

As shown in the figure, by arranging the permanent magnet 21 so as to be sandwiched between the first magnetic pole tooth 11 and the second magnetic pole tooth 12, the first magnetic pole tooth 11, the second magnetic pole tooth 12, and the permanent magnet 21 Since the suction force can be reduced, the support mechanism is simplified, and the lightweight movable portion 23 can be configured. Moreover, since the movable part 23 is lightweight, there are advantages such as high acceleration driving and high responsiveness. Furthermore, in the present invention, since the mover 27 is lightweight, the permanent magnet 21 is stabilized at the center of the first magnetic pole tooth 11 and the second magnetic pole tooth 12 by the attractive force of the permanent magnet 21. For this reason, the distance between the position detection device 34 and the scale 39 shown in FIG. 14 can be kept substantially constant. Furthermore, a stable attraction force can be obtained by flowing a current through the winding 41 in the d-axis phase so as to coincide with the position of the permanent magnet 21, and the position of the permanent magnet 21 can be stabilized.

In addition, this invention is not limited to the above-mentioned Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 ... Sealed metal container, 2 ... Insulation support spacer, 3 ... Fixed side contactor, 4 ... Movable side contactor, 5 ... Nozzle, 6 ... Movable electrode, 7 ... Insulation support cylinder, 8 ... High voltage conductor, 11, 11a , 11b: first magnetic pole teeth, 12, 12a, 12b ... second magnetic pole teeth, 13, 13a, 13b, 13c ... magnetic bodies, 21 ... permanent magnets, 23 ... movable parts, 25 ... magnetization directions, 26 ... magnetic fluxes Direction, 27: Movable element, 28: Movable member, 29 ... Hook, 30 ... Metal fitting, 31, 32 ... Reinforcing member, 33 ... Positioning hole, 34 ... Position detecting device, 35 ... Bearing, 36 ... Positioning shaft, 37 ... Hydraulic pressure Cylinder, 38 ... Piston, 39 ... Scale, 41, 41a, 41b ... Winding, 51 ... Current transformer, 61 ... Actuator case, 62 ... Linear seal part, 71 ... Amplifier, 72 ... Control unit, 81 ... Insulating rod 90, springs 91, 91a, 2, 92a ... magnetic flux, 100 ... linear motor, 101 ... armature, 601 ... spring thrust area, 602 ... linear motor thrust area, 603 ... linear motor thrust (negative area), 604 ... operator 605 ... negative thrust (brake force, hoisting force) region, 606 ... thrust force region by brake spring, (A) ... shut-off part, (B) ... operation part.

Claims

A blocking portion comprising a fixed contact and a movable contact that contacts or separates from the fixed contact, a linear motor that generates a driving force for operating the movable contact, and a contact or opening of the blocking portion. An opening / closing device comprising: a thrust generation source for assisting thrust to the linear motor at the time of acceleration or deceleration of the linear motor at the time of separation or acceleration / deceleration.
The switchgear according to claim 1,
The linear motor includes a mover formed by arranging a plurality of permanent magnets or magnetic materials while reversing the magnetization direction, and first and second magnetic pole teeth arranged so as to sandwich the permanent magnets or magnetic materials from above and below. Magnetic pole teeth, a magnetic material connecting the first magnetic pole teeth and the second magnetic pole teeth to form a magnetic flux path, and armatures comprising windings respectively disposed on the first magnetic pole teeth and the second magnetic pole teeth And a switchgear characterized by comprising:
The switchgear according to claim 2, wherein
At least two of the first magnetic pole teeth and the second magnetic pole teeth are juxtaposed in the moving direction of the mover or armature, and both are connected by the magnetic body, and from the winding A switchgear characterized in that at least two different magnetic paths through which magnetic flux passes are formed.
The switchgear according to claim 3, wherein
At least two different magnetic paths through which the magnetic flux from the winding passes are such that the magnetic flux from the winding is from the magnetic body to the first magnetic pole tooth, from the first magnetic pole tooth to the second magnetic pole tooth, A first path from the second magnetic pole tooth to the magnetic body; a direction orthogonal to the first path; and the adjacent armature or armature in the direction of travel of the armature And a second path from the first magnetic pole tooth to the second magnetic pole tooth.
The switchgear according to claim 1,
The blocking portion is housed in a container, and the linear motor is installed in a case disposed adjacent to the container, and the mover of the linear motor is connected to the movable contact in the container and an insulating rod. Opening and closing device characterized by being connected via.
The switchgear according to claim 1,
A current detector connected to the movable contact and arranged around a main circuit conductor constituting a part of the main circuit, and detecting a current flowing through the main circuit conductor, and a current value detected by the current detector A control unit that controls a current value supplied to the linear motor in accordance with the current value; and an amplifier that receives a command from the control unit and supplies a current according to the command to the linear motor. Opening and closing device characterized by that.
The switchgear according to claim 1,
The opening / closing apparatus characterized in that the thrust generation source comprises a spring or a hydraulic cylinder.
The switchgear according to claim 7,
The spring is connected to a movable element of the linear motor through a movable part connected to the movable contact, and assists the compression force or tensile force of the spring as a thrust to the linear motor. Switchgear.
A blocking part comprising a fixed contact and a movable contact that contacts or separates from the fixed contact; a linear motor that generates a driving force for operating the movable contact; and a contact or opening of the blocking part. A thrust generation source for assisting thrust to the linear motor at the time of acceleration or deceleration or acceleration / deceleration of the linear motor at the time of separation;
The linear motor is formed by arranging a plurality of permanent magnets or magnetic materials while reversing the magnetization direction, and at least two stages of upper and lower movers, and the permanent magnets or magnetic materials of the respective movers from above and below. A first magnetic pole tooth and a second magnetic pole tooth arranged so as to be sandwiched, a magnetic body connecting the first magnetic pole tooth and the second magnetic pole tooth to form a magnetic flux path, the first magnetic pole tooth and the second magnetic pole tooth Each of the magnetic pole teeth of the linear motor includes an armature formed of a winding, and the thrust generation source includes a spring disposed at an axial end of the linear motor so as to cover the mover. Opening and closing device.
The switchgear according to claim 9,
Two movable parts are provided in the axial direction of the end of the linear motor, the spring is disposed between the two movable parts, and the other movable part is fixed to one of the movable parts. An opening / closing apparatus comprising a hook member that is engaged with the spring in a compressed state and that releases the compression when the engagement is released.
The switchgear according to claim 9,
The opening and closing device characterized in that the spring is installed between the movable elements arranged in two stages in the vertical direction.
The switchgear according to claim 9,
The spring is characterized in that a spring for assisting thrust during acceleration and a spring for assisting thrust during deceleration are arranged at both ends in the axial direction of the linear motor so as to cover the mover. apparatus.
The switchgear according to claim 9,
An opening / closing apparatus characterized in that a thrust FS for compressing the spring and a thrust FL of the linear motor satisfy FL> FS.
The switchgear according to claim 9,
The point of action of the thrust generated by the mover or the point of action of the resultant force of the thrust and the point of action of the spring that assists the thrust during acceleration or deceleration or acceleration / deceleration of the mover are coaxial. Opening and closing device characterized.
The switchgear according to claim 12,
An opening / closing device characterized in that the spring thrust FS1 for assisting thrust during acceleration and the spring thrust FS2 for assisting thrust during deceleration satisfy FS1 <FS2.