WO2014080655A1 - 開閉機器 - Google Patents
開閉機器 Download PDFInfo
- Publication number
- WO2014080655A1 WO2014080655A1 PCT/JP2013/065838 JP2013065838W WO2014080655A1 WO 2014080655 A1 WO2014080655 A1 WO 2014080655A1 JP 2013065838 W JP2013065838 W JP 2013065838W WO 2014080655 A1 WO2014080655 A1 WO 2014080655A1
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- WIPO (PCT)
- Prior art keywords
- fixed
- mounting plate
- side mounting
- plate
- conductor
- Prior art date
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- 239000004020 conductor Substances 0.000 claims abstract description 87
- 125000006850 spacer group Chemical group 0.000 claims description 10
- 244000145845 chattering Species 0.000 description 18
- 230000005684 electric field Effects 0.000 description 14
- 230000002093 peripheral effect Effects 0.000 description 9
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/6606—Terminal arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
- H01H2033/6623—Details relating to the encasing or the outside layers of the vacuum switch housings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
- H01H2033/6665—Details concerning the mounting or supporting of the individual vacuum bottles
Definitions
- This invention relates to an opening / closing device used in a power receiving / transforming facility.
- chattering when a contact pair in an open state is turned on (closed) at a certain speed, bounce occurs between the contacts. This bounce is generally called chattering. Since a voltage is applied between the contacts, an arc is generated due to chattering, and the contact surface is roughened or consumed, resulting in a disadvantage that the contact resistance increases unnecessarily. In addition, when the chattering duration is long, there is a problem in that the contacts are welded. Therefore, it is necessary to shorten the chattering duration as much as possible.
- the fixed contact side is fixed to an insulating support via a fixed conductor and an elastic body Is disclosed.
- the fixed conductor portion serves as chattering suppression means, and the fixed conductor is composed of a plurality of laminated plates and is directly connected to the fixed contact.
- chattering having a natural frequency of several kHz or less. I try not to intervene.
- the contact is turned on, a plurality of micro collisions are repeated between the laminated plates, so that kinetic energy is consumed and chattering duration time is suppressed (for example, see Patent Document 1).
- the fixed conductor as the chattering suppressing means is composed of at least three or more laminated plates in order to mitigate the impact, and this fixed conductor has an elastic body. And is supported by an insulating support.
- the fixed conductor portion directly connected to the fixed side of the vacuum valve serves as an energization path to which a high voltage and a large current are applied.
- a high electric field is generated at the corners of the laminated plate and the component end of the elastic body.
- an electric field relaxation shield that covers the whole of them is disposed around the entire circumference of the fixed conductor portion. It is necessary to take electric field mitigation measures, and there is a problem that the structure becomes complicated when the configuration of Patent Document 1 is applied to an actual switchgear.
- the present invention has been made to solve the above-described problems.
- An open / close device that can suppress chattering when a contact is turned on with a simple configuration while ensuring a current-carrying path and considering electric field relaxation. The purpose is to provide.
- a fixed valve and a movable contact are accommodated in a vacuum vessel, a fixed mounting plate that supports a fixed conductor connected to the fixed contact, and the fixed mounting plate are spaced apart from each other.
- a switching device comprising an insulating support that is supported in a bridge shape by at least two support portions, and an operating mechanism that is connected to a movable conductor connected to the movable contact and opens and closes both contacts.
- the plate is formed by superimposing a plurality of plate-like members, and the fixed-side conductor of the vacuum valve is supported substantially at the center of the two support portions of the fixed-side mounting plate directly or via an impact force transmitting means. It is.
- a vacuum valve in which a fixed contact and a movable contact are accommodated in a vacuum vessel, a fixed side mounting plate that supports a fixed side conductor connected to the fixed contact, and a fixed side mounting plate that accommodates the vacuum valve inside and has one end side
- the fixed-side mounting plate has a plurality of The plate-shaped member is overlapped, and the exposed portion of the fixed-side conductor exposed to the outside of the vacuum vessel has a fitting hole for fitting with the exposed portion, and a slit is formed in the radial direction from the fitting hole.
- the terminal is mounted, the split terminal is fixed to the fixed side mounting plate, and the fixed side conductor of the vacuum valve is supported by the fixed side mounting plate via the split terminal.
- the fixed-side mounting plate that supports the fixed-side conductor of the vacuum valve is configured by superimposing a plurality of plate-like members, and the fixed-side conductor of the vacuum valve directly or impact force transmitting means. Because it is supported at almost the center of the two support portions of the fixed side mounting plate, the collision energy during the closing operation is attenuated by the fixed side mounting plate portion, and chattering between the contacts is effectively suppressed. Can do.
- the fixed-side mounting plate is formed by stacking a plurality of plate-like members, and a split terminal fitted to the exposed portion is attached to the exposed portion of the fixed-side conductor exposed to the outside of the vacuum vessel. Is fixed to the fixed-side mounting plate, and the fixed-side conductor of the vacuum valve is supported by the fixed-side mounting plate via the split terminal, so that the collision energy during the closing operation is attenuated by the split terminal and the fixed-side mounting plate. And chattering between the contacts can be effectively suppressed. Further, by using the split terminal, the number of the fixed-side mounting plates can be reduced, and the switchgear can be miniaturized.
- FIG. 6 is a partial sectional view showing another example of the switchgear according to Embodiment 1 of the present invention. It is a fragmentary sectional view of the principal part which shows the switchgear by Embodiment 2 of this invention. It is a fragmentary sectional view of the principal part which shows the switchgear by Embodiment 3 of this invention. It is a top view which shows the stationary-side attachment board part used for the switchgear by Embodiment 4 of this invention.
- FIG. 1A and 1B are diagrams showing a switchgear according to Embodiment 1 of the present invention, in which FIG. 1A is a side sectional view and FIG. 1B is a bottom view.
- (A) is a sectional view taken along the central axis AA of (b).
- the switchgear includes a vacuum valve 1 in which a fixed contact 1a and a movable contact 1b are housed in a vacuum vessel 1c, a fixed-side mounting plate 2 that supports and fixes the fixed side of the vacuum valve 1, and a vacuum valve.
- an insulating support 3 for insulatingly supporting the fixed side mounting plate 2, a connecting rod 4 connected to the movable side of the vacuum valve 1, one end connected to the connecting rod 4, and the other end operating mechanism (not shown) And an insulating rod 5 that insulates the vacuum valve 1 from the grounding side and transmits the driving force of the operating mechanism to the connecting rod 4 side.
- a fixed-side conductor 1d is fixed to the fixed contact 1a of the vacuum valve 1, and the other end is drawn out from the fixed-side end plate portion of the vacuum vessel 1c.
- a split terminal 6 is attached to an exposed portion of the fixed-side conductor 1d drawn to the outside, and the split terminal 6 is attached to the fixed-side mounting plate 2.
- the fixed-side mounting plate 2 is fixed to one open end of the cylindrical insulating support 3. Therefore, the fixed-side conductor 1d is supported and fixed to the fixed-side mounting plate 2 via the split terminal 6, and the fixed-side mounting plate 2 is fixed to the insulating support 3, so that the vacuum valve 1 is connected to the insulating support 3. Supported inside. Details of the split terminal 6 and the fixed-side mounting plate 2 will be described later.
- a fixed-side connection terminal 7 connected to the external main circuit conductor is fixed to the distal end side of the fixed-side conductor 1d.
- one end of the movable conductor 1e is fixed to the movable contact 1b, and the other end is drawn out from the movable end plate of the vacuum vessel 1c via the bellows 1f.
- An internal thread is formed at the end of the movable conductor 1e drawn to the outside, and the external thread of the connecting rod 4 is screwed into the internal thread and fastened with a nut.
- the flexible conductor 8 is also fastened together.
- a movable connection terminal 9 is connected to the flexible conductor 8.
- the insulating rod 5 connected to the connecting rod 4 is formed in a cylindrical shape by glass epoxy or the like, and has holes for pin coupling at both ends.
- the movable contact 1b of the vacuum valve 1 is driven in the left-right direction in the figure integrally with the movable side conductor 1e, the connecting rod 4 and the insulating rod 5 by a driving force from an operating mechanism (not shown). Shut off or turn on the large current generated in the current path.
- the insulating support 3 is formed in a substantially cylindrical shape by an insulating member such as an epoxy resin, for example, and accommodates movable parts such as the vacuum valve 1 and the insulating rod 4 therein.
- a buried metal (see an enlarged view of FIG. 4) for fastening with the fixed side mounting plate 2 is embedded in the opening end portion of the insulating support 3 on the side on which the fixed side mounting plate 2 is mounted. Using this buried metal, the fixed-side mounting plate 2 is fixed to the insulating support 3 by bolting through the spacer 10.
- the spacer 10 has the same diameter as the buried metal, and a through hole through which the tightening bolt passes is provided at the center.
- the open end of the insulating support 3 on the side where the insulating rod 5 is accommodated is attached to a fixed plate 11 that is a grounding portion, and the entire switching device is fixed to the fixed plate 11.
- the fixed plate 11 is a member provided on the housing side that houses the opening / closing device.
- the fixed-side mounting plate 2 is configured by overlapping two plate-like members having the same shape with a slightly larger outer shape than the opening of the insulating support 3.
- the outer shape may be circular according to the opening of the insulating support 3 or may be rectangular as described later.
- the material of the fixed side mounting plate 2 is preferably an aluminum alloy or stainless steel.
- aluminum alloy since the fixed side mounting plate 2 can be used as a conductor, for example, there is no need to provide a connecting conductor such as the fixed side connection terminal 7, and the external main circuit conductor is directly connected to the fixed side mounting plate 2.
- the loss factor indicating the damping characteristics of the metal material is about 10 times larger than that of the aluminum alloy for stainless steel, and has a characteristic that stainless steel is more easily damped with respect to input vibration.
- FIG. 1 illustrates the case where stainless steel is employed. Therefore, the fixed-side connection terminal 7 described above is attached to the tip of the fixed-side conductor 1d of the vacuum valve 1.
- a through-hole 2a having an inner diameter larger than the outer diameter of the fixed-side connection terminal 7 is provided at the center of the fixed-side mounting plate 2, and the fixed-side connection terminal 7 exposed to the outside through the through-hole 2a is externally provided. Connect the main circuit conductor.
- the fixed connection terminal 7 may be formed integrally with the movable conductor 1d without being a separate member.
- the outer peripheral portion of the fixed side mounting plate 2 has a high electric field. In view of this, a curved portion 2b formed in a curved surface is provided at the corner portion of the outer periphery of the superimposed fixed mounting plate 2 so as not to become an edge in consideration of electric field relaxation.
- FIG. 2A and 2B are detailed views of the split terminal 6, wherein FIG. 2A is a plan view seen in the axial direction of the vacuum valve 1, and FIG. 2B is a side view.
- the split terminal 6 has a disk-like outer shape, and has a fitting hole 6a at the center of the split terminal 6 for fitting with the exposed portion of the fixed-side conductor 1d exposed to the outside from the vacuum vessel 1a. Then, a slit 6b is provided that divides in a radial direction from the fitting hole 6a.
- a part of the outer peripheral part is cut away to provide a flat part 6c, which is formed in the flat part 6c.
- the tightening screw 12 is configured to be tightened by using the tightening hole.
- a mounting hole 6d for mounting the fixed side mounting plate 2 is provided. The assembling of the split terminal 6 is fixed to the fixed-side conductor 1d by fitting the exposed portion of the fixed-side conductor 1d and then tightening the tightening screw 12 inserted from the flat surface portion 6c at a predetermined position.
- the split terminal 6 shown in FIG. 2 an example in which a female screw is formed on the inner peripheral side of the fitting hole 6a is illustrated.
- a male screw is formed on the outer peripheral side of the exposed portion of the fixed-side conductor 1d that is fitted thereto.
- the female screw of the split terminal 6 is screwed into the exposed portion of the fixed-side conductor 1d, and the fastening screw 12 is fastened and fixed at a predetermined position.
- the threaded portion is provided and fitted, it is possible to fit more firmly than in the case of a combination with a cylindrical fitting, and it is effective that the fitting portion is displaced or loosened due to vibration or the like during contact opening and closing. Can be prevented.
- FIG. 2 has a disk-like outer shape, but the part where the split terminal 6 is used is the inner side surrounded by the fixed-side mounting plate 2 and the insulating support 3. There is no need for a disc shape.
- FIG. 3 is another example of the split terminal, and is a plan view (a) and a side view (b) showing the split terminal 13 when the outer shape is a rectangular parallelepiped. As in FIG. 2, the center portion has a fitting hole 13a, and a female screw is formed on the inner peripheral side thereof.
- a slit 13b is provided by dividing a part of the fitting hole 13a in the radial direction, a screw hole 13c for the tightening screw 12 for tightening the slit 13b, and a mounting hole 13d for mounting the fixed side mounting plate 2 have.
- the outer shape is a rectangular parallelepiped, it can be manufactured at lower cost because it is easier to process than the disk shape. It is good also as a cylinder fitting system without providing an internal thread in the fitting hole 13a.
- the portion described as the split terminal 6 is equivalent even if it is replaced with the split terminal 13.
- FIG. 4 is a partial cross-sectional view showing only the periphery of the fixed side of the vacuum valve 1.
- the other end of the fixed conductor 1d whose one end is connected to the fixed contact 1a passes through the fixed end plate of the vacuum vessel 1c and is drawn to the outside.
- the side conductor 14 is a disk-shaped portion 14a in which a portion penetrating the fixed side end plate of the vacuum vessel 1c has a disk shape.
- the vacuum valve is standardized to some extent, and may be a fixed-side conductor 14 as shown in FIG.
- connection conductor 15 is attached to the disk-like portion 14a of the fixed-side conductor 14 by bolting or the like, and the fixed-side connection terminal 7 is attached to the tip end side thereof.
- a male screw is formed that is screwed into the female screw of the fitting hole 6 a of the split terminal 6.
- fixed-side conductor refers to the combination of the fixed-side conductor 14 and the connection conductor 15 in FIG. Including other shapes.
- the fixed connection terminal 7 may be formed integrally with the connection conductor 15.
- the insulating support structure as in the first embodiment is employed, the regulation of the spring constant can be achieved even when the number of the fixed side mounting plates 2 is two. Therefore, in the switchgear of the present application, the thickness and shape of the fixed-side mounting plate 2 are determined so that the spring constant falls within the above range.
- the fixed-side mounting plate 2 can be composed of two plate-like members, the number of parts can be reduced and the switchgear can be downsized. Moreover, the time required for assembly preparation (cleaning, etc.) and assembly can be shortened, and the cost of surface treatment can be reduced. Furthermore, in this structure, the impact energy at the time of closing of the switchgear is transmitted to the split terminal 6 through the fitting portion of the fixed-side conductor 1d and then transmitted to the fixed-side mounting plate 2. Here, when passing through the fitting part of the split terminal 6, a part of the impact energy is dissipated by the friction of the fitting part.
- the effect of dissipating impact energy is greater when the fitting portion between the fixed-side conductor 1d and the split terminal 6 is screw-coupled than in the case of a cylindrical fitting. If only screws are used instead of split terminals, a separate member such as a lock nut is required at the fastening part, which increases the total length of the fixed-side conductor, and complicates the tightening work. Arise.
- a spacer 10 is inserted between the fixed-side mounting plate 2 and the insulating support 3 to provide a gap.
- the gap is generated from the fixed side and the movable side of the vacuum valve 1 when energized. Since the insulating medium heated by the heat generation can flow out of the insulating support 3, the heat dissipation performance is improved.
- the spacer 10 is not provided, the fixed side mounting plate 2 and the insulating support 3 are close to each other to form a narrow space to form a triple junction.
- the provision of the spacer 10 can suppress the generation of the triple junction. It is possible to suppress the occurrence of discharge from around the mounting portion of the fixed side mounting plate 2.
- the insulating support 3 to which the fixed side mounting plate 2 is attached is a cylindrical insulating support that accommodates the vacuum valve 1. That is, the fixed-side mounting plate 2 is fixed using the end portion of the insulating support 3 that accommodates the vacuum valve 1.
- the present invention is not limited to this.
- an insulating support is disposed on the right side of the fixed-side mounting plate 2, and the insulating support and the fixed-side mounting plate are supported at least at two locations with a space therebetween.
- the structure which supports in bridge shape in a part may be sufficient. As in the case of FIG.
- the fixed-side mounting plate 2 is formed by stacking a plurality of plate-like members, and the fixed-side conductor 1d of the vacuum valve 1 is directly or via an impact force transmitting means.
- the impact force transmitting means does not particularly require a conductive function, and the shape may be a split terminal structure as shown in FIG.
- the fixed contact and the movable contact are accommodated in the vacuum vessel, the fixed side mounting plate that supports the fixed side conductor connected to the fixed contact, An insulating support that supports the fixed-side mounting plate in a bridge shape with at least two support portions at an interval, and an operation mechanism that is connected to a movable-side conductor connected to the movable contact and opens and closes both contacts.
- the fixed-side mounting plate is formed by overlapping a plurality of plate-like members, and the fixed-side conductor of the vacuum valve is directly or via the impact force transmitting means of the two support portions of the fixed-side mounting plate. Since it is supported at substantially the center, the collision energy during the closing operation can be attenuated by the fixed-side mounting plate portion, and chattering between the contacts can be effectively suppressed.
- a vacuum valve in which a fixed contact and a movable contact are accommodated in a vacuum vessel, a fixed side mounting plate that supports a fixed side conductor connected to the fixed contact, and a fixed side mounting plate that accommodates the vacuum valve inside and has one end side
- the fixed-side mounting plate has a plurality of The plate-shaped member is overlapped, and the exposed portion of the fixed-side conductor exposed to the outside of the vacuum vessel has a fitting hole for fitting with the exposed portion, and a slit is formed in the radial direction from the fitting hole.
- the terminal is mounted, the split terminal is fixed to the fixed side mounting plate, and the fixed side conductor of the vacuum valve is supported by the fixed side mounting plate via the split terminal. Attenuation of collision energy during operation, chattering between contacts It can be effectively suppressed. Further, by using the split terminal, the number of the fixed-side mounting plates can be reduced, and the switchgear can be miniaturized.
- the fixed-side mounting plate is configured by superimposing two plate-like members having the same outer shape, a fixed-side mounting plate having a spring constant effective for chattering suppression is obtained with a simple configuration. be able to.
- the corner portion of the outer periphery of the superimposed fixed mounting plate is formed in a curved surface, the outer peripheral portion of the fixed mounting plate that has a high electric field can be formed without providing a special electric field relaxation shield or the like. The electric field can be relaxed.
- a through hole is provided in the center of the fixed side mounting plate, and the fixed side conductor or fixed side connection terminal of the vacuum valve passes through the through hole and is drawn out of the fixed side mounting plate.
- the external main circuit conductor can be easily connected to the fixed contact side.
- the spacer is interposed in the fixed part between the fixed side mounting plate and the insulating support, the insulating medium heated by the heat generated from the vacuum valve when energized is provided by providing a space by the spacer.
- the heat dissipation performance is improved.
- the spacer it is possible to suppress the generation of triple junctions in the vicinity of the fixed side mounting plate and the insulating support, and it is possible to suppress the occurrence of discharge from the periphery of the fixed side mounting plate.
- FIG. FIG. 5 is an enlarged partial cross-sectional view of only the periphery of the vacuum valve fixed side of the switchgear according to the second embodiment. Since configurations other than those shown in FIG. 1 are the same as those in FIG. 1 of the first embodiment, description thereof will be omitted, and differences will be mainly described. The difference is the configuration of the fixed side mounting plate.
- the fixed-side mounting plate 16 of the present embodiment has a two-sheet configuration, but is not the same shape but is configured by stacking two types of plate-like members 17 and 18 having different shapes.
- the outer shape of the plate-like member 17 on the side facing the vacuum valve 1 is reduced, the outer shape of the outer plate-like member 18 is increased and the thickness is increased, and a recess is formed on one surface of the plate-like member 18.
- a plate-like member 17 is fitted into and stacked.
- a curved surface portion 18a formed with a large curvature is provided on the outer periphery of the plate-like member 18 serving as the outside.
- the fixed-side mounting plate is composed of two plate-like members having different outer sizes, and a recess is formed on one surface of the large-shaped plate-like member. Since a plate member having a small outer shape is fitted into the recess and overlapped, a large curved surface necessary for electric field relaxation can be obtained while securing a desired spring constant for the fixed-side mounting plate.
- FIG. 6 is a partial cross-sectional view showing, in an enlarged manner, only the periphery of the vacuum valve fixed side of the switchgear according to the third embodiment. Since configurations other than those shown in FIG. 1 are the same as those in FIG. 1 of the first embodiment, description thereof will be omitted, and differences will be mainly described. The difference is the configuration of the fixed side mounting plate.
- a thin plate 19 made of a light material having a lower rigidity than the fixed side mounting plate 2 is inserted between the fixed side mounting plates 2 made of two plate-like members.
- a thin plate having a lower rigidity and a smaller thickness than the fixed side mounting plate is sandwiched between the fixed side mounting plates made of two plate-like members. Therefore, it is easy to make adjustments so that the spring constant of the fixed-side mounting plate is within the specified range without greatly changing the overall structure. It can correspond to.
- FIG. 7 is a plan view of the fixed-side mounting plate portion of the switchgear according to Embodiment 4, and is a view seen in the axial direction of the vacuum valve 1. Since the basic configuration of the switchgear is the same as that of FIG. 1 of the first embodiment, the illustration and description are omitted, and differences will be mainly described.
- the fixed-side mounting plate 20 of the present embodiment is also composed of two plate-like members, and the configuration of the two plates is equivalent to any one of the first to third embodiments.
- the fixed-side mounting plate 20 composed of two plate-like members has a through-hole 20a through which the fixed-side conductor 1d, the connection terminal 7 or the connection conductor 15 penetrates at the center, and in the vicinity of the peripheral edge.
- a fixing hole 20b for fixing to the insulating support 3 is formed, and a mounting hole 20c for connecting to the split terminal 6 is provided outside the through hole 20a.
- a ventilation hole 20d is provided outside the attachment hole 20c and inside the fixing hole 20b.
- the thickness and shape of the plate-like member are set so that the spring constant of the entire fixed-side mounting plate 20 falls within the range described in the first embodiment in the state where the vent hole 20d is formed. Further, a curved surface portion for electric field relaxation is provided on the outer peripheral portion, similarly to the fixed-side mounting plate described so far. With such a configuration, the insulating medium heated by the vacuum valve 1 and the energizing portion arranged in the insulating support 3 can be efficiently discharged from the vent hole 20d to the outside.
- the outer shape of the fixed-side mounting plate 20 is rectangular, but the shape is not limited to this and may be circular.
- the fixed-side mounting plate is provided with the vent hole leading to the inner side of the insulating support, and thus is generated from the device accommodated inside the insulating support.
- the insulating medium that has become high temperature due to the heat generated can be effectively ventilated, and the temperature rise can be suppressed.
- the embodiments can be freely combined, or the embodiments can be appropriately changed or omitted.
Landscapes
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
Description
チャタリングの抑制を考慮した従来の開閉機器としては、例えば、固定接点と可動接点を有する真空バルブを備えた開閉機器において、固定接点側が固定導体と弾性体を介して絶縁支持台に固定された構成が開示されている。固定導体部分がチャタリング抑制手段となっており、固定導体は複数の積層板で構成されて固定接点と直結され、接点との間には固有振動数が数kHz以下のチャタリングに影響を与える部材を介在させないようにしている。接点投入時に積層板間で複数回の微小衝突が繰り返されることにより、運動エネルギーが消費されてチャタリングの継続時間を抑制するようにしたものである(例えば、特許文献1参照)。
また、割端子を用いることにより、固定側取付板の積層枚数を少なくすることができ、開閉機器の小形化を図ることができる。
図1は、この発明の実施の形態1による開閉機器示す図であり、(a)は側面断面図、(b)は底面図である。なお、(a)は(b)の中心軸A-Aにおける断面図である。
先ず、開閉機器の全体構成の概要から説明する。
図1において、開閉機器は、固定接点1aと可動接点1bが真空容器1c内に収容された真空バルブ1と、真空バルブ1の固定側を取り付けて支持固定する固定側取付板2と、真空バルブ1および固定側取付板2を絶縁支持する絶縁支持物3と、真空バルブ1の可動側に接続された連結ロッド4と、一端が連結ロッド4に連結され他端が操作機構(図示せず)に連結されて、真空バルブ1と接地側とを絶縁すると共に、操作機構の駆動力を連結ロッド4側に伝達する絶縁ロッド5とを有している。
図示しない操作機構からの駆動力によって、真空バルブ1の可動接点1bは、可動側導体1e,連結ロッド4及び絶縁ロッド5と一体になって図の左右方向へ駆動されて、開閉機器は、その通電経路に発生する大電流を遮断または投入する。
一方の、絶縁ロッド5が収容される側の絶縁支持物3の開口端部は、接地部である固定板11に取り付けられて、開閉機器全体が固定板11に固定されている。なお、固定板11は、開閉機器を収容する筐体側に設けられた部材である。
図1に示すように、固定側取付板2は、絶縁支持物3の開口部よりやや大きい外形の同形状の2枚の板状部材が重ね合わせて構成されている。外形は絶縁支持物3の開口部に合わせて円形とするか、後述するような矩形状にしても良い。
固定側取付板2の材料は、アルミ合金もしくはステンレスが望ましい。アルミ合金の場合は、固定側取付板2が導体として利用できるため、例えば、固定側接続端子7のような接続導体を設ける必要はなく、固定側取付板2に直接、外部主回路導体を接続することが可能である。ただし、金属材料の制振特性を示す損失係数は、ステンレスの方がアルミ合金より約10倍程大きく、入力された振動に対してステンレスの方が減衰させやすい特性がある。
なお、固定側接続端子7を別部材とせず、可動側導体1dと一体に形成しても良い。
固定側取付板2の外周部は高電界となる。そこで、重ね合わされた固定側取付板2の外周の角部となる部分は、電界緩和を考慮してエッジにならないように、曲面に形成した曲面部2bを設けている。
割端子6は、外形が円板状をし、その中心部には、真空容器1aから外部に露出した固定側導体1dの露出部と嵌合する嵌合穴6aを有している。そして、嵌合穴6aから径方向に割くスリット6bが設けられ、スリット6b部を外部からねじ締めするために、外周部の一部を切り欠いて平面部6cを設け、その平面部6cに形成した締付穴を利用して締付ねじ12により締付可能に構成されている。更に、固定側取付板2を取り付けるための取付穴6dが設けられている。
割端子6の組み付けは、固定側導体1dの露出部へ嵌合させた後、所定の位置で平面部6cから挿入した締付ねじ12を締め付けることで固定側導体1dに固定される。
図3は、割端子の他の例であり、外形が直方体の場合の割端子13を示す平面図(a)と側面図(b)である。図2と同様に、中心部に嵌合穴13aを有し、その内周側には雌ねじが形成されている。嵌合穴13aの一部を径方向に割いてスリット13bが設けられ、スリット13b部を締め付けるための締付ねじ12用のねじ用穴13c、及び固定側取付板2を取り付けるための取付穴13dを有している。外形が直方体の場合は、円板状の場合に比べて加工が容易であるため安価に製作できる。嵌合穴13aには雌ねじを設けずに円筒はめ込み方式としても良い。
なお、以下の説明において、割端子6と説明する部分は割端子13と置き換えても同等である。
先の図1では、固定接点1aに一端が接続された固定側導体1dの他端側は、真空容器1cの固定側端板を貫通して外部に引き出されていたが、図4に示す固定側導体14は、真空容器1cの固定側端板を貫通する部分が円板状をした円板状部14aとなっている。真空バルブはある程度規格化されており、図4のような固定側導体14の場合もある。この場合は、割端子6を直接接続できないので、先ず、固定側導体14の円板状部14aに接続導体15をボルト締め等で取り付けて、その先端側に固定側接続端子7を取り付ける。接続導体15の外周側には割端子6の嵌合穴6aの雌ねじに螺合する雄ねじが形成されている。
なお、固定側接続端子7は、接続導体15と一体に形成しても良い。
開極状態にある固定接点と可動接点が、投入指令によりある速度で投入(閉極)されると、接点間でチャタリングが生じる。
チャタリング現象を抑制するためには、閉極動作時の衝撃荷重に対応して、周辺の固定部があるばね定数を有して変歪する間に、衝突エネルギーを減衰,消散させることが必要となる。
実施の形態1のような絶縁支持構造においては、固定側取付板2のばね定数を10~100kN/mm以下とすることで、チャタリング抑制に効果的であることが、発明者らの実験検証によって分かった。そして、実施の形態1のような絶縁支持構造を採用すれば、固定側取付板2の積層枚数を2枚としても上記ばね定数の規定を達成できることが分かった。したがって、本願の開閉機器では、ばね定数が上記範囲内に入るように、固定側取付板2の厚さ及び形状が決定されている。
更に、この構造においては、開閉機器の閉極時の衝撃エネルギーは、固定側導体1dの嵌合部を介して割端子6へ伝えられ、その後固定側取付板2に伝わる。ここで、割端子6の嵌合部を介する際に、一部の衝撃エネルギーは嵌合部の摩擦によって消散される。
したがって、固定側導体1dと割端子6の嵌合部をねじ結合としたほうが、円筒形状のはめ込みの場合よりも衝撃エネルギーの消散効果が大きい。
なお、割端子にせずにねじのみとした場合には、締結部に止めナットのような別部材が必要となり、固定側導体の全長が伸び、また、締付作業が煩雑化する等のデメリットが生じる。
更に、スペーサ10がない場合は、固定側取付板2と絶縁支持物3が近接して狭い空間が形成されてトリプルジャンクションとなるが、スペーサ10を設けることでトリプルジャンクションの生成を抑制すことができ、固定側取付板2の取付部周辺からの放電発生を抑制できる。
また、割端子を用いることにより、固定側取付板の積層枚数を少なくすることができ、開閉機器の小形化を図ることができる。
図5は、実施の形態2による開閉機器の、真空バルブの固定側周辺のみを拡大して表した部分断面図である。図示以外の構成は、実施の形態1の図1と同等なので説明を省略し、相違点を中心に説明する。相違点は、固定側取付板の構成である。
図5において、本実施の形態の固定側取付板16は、2枚構成ではあるが、同形状ではなく、形状が異なる2種類の板状部材17,18が積層されて構成されている。真空バルブ1に対向する側の板状部材17の外形を小さくし、外側となる板状部材18の外形を大きくすると共に厚さも厚くし、板状部材18の一面に凹部を形成し、この凹部に板状部材17を嵌め込み重ね合わせて構成したものである。
外側となる板状部材18の外周には大きな曲率で形成した曲面部18aを設けている。
開閉機器をより高い電圧定格に適用する場合、固定側取付板の周辺の電界をさらに低減させる必要がある。このためには、固定側取付板の外周に大きな曲面を有した電界緩和構造を採用するのが望ましいが、大きな曲面を確保するために積層する個々の板状部材の板厚を厚くすると、固定側取付板全体のばね定数が上昇するため、実施の形態1で説明したばね定数の範囲内に入れるのが難しくなる。
そこで、図5のように、取付板外周のみ厚さを厚くした板状部材18の内側に板状部材17を嵌め合わせることで、全体のばね定数を実施の形態1のような構成の固定側取付板と大きく変動させることなく、電界緩和に必要な大きな曲面部18aを形成することができる。
図6は、実施の形態3による開閉機器の、真空バルブの固定側周辺のみを拡大して表した部分断面図である。図示以外の構成は、実施の形態1の図1と同等なので説明を省略し、相違点を中心に説明する。相違点は、固定側取付板部の構成である。
図6において、2枚の板状部材からなる固定側取付板2の間に固定側取付板2と比較して剛性が低く軽い材料からなる薄板19が挿入されている。薄板19を挿入することで、固定側取付板2部のばね定数や固定側取付板2部全体の質量をほとんど変化させることなく、積層枚数を増やして、固定側取付板2が変歪した際に板間に生じる摩擦による振動減衰を大きくする効果を得ることができる。
なお、薄板を挿入する構成は、実施の形態2の図5にも、同様に適用できる。
実施の形態4.
本実施の形態の固定側取付板20も2枚の板状部材で構成されおり、2枚の構成の仕方は、実施の形態1~3のいずれかと同等である。
このような構成により、絶縁支持物3内に配置された真空バルブ1や通電部によって暖められた絶縁媒体を効率よく通気穴20dから外部へ排出させることができる。
なお、図7では固定側取付板20の外形形状を矩形状としているが、これに限定するものではなく円形であっても良い。
1d 固定側導体、1e 可動側導体、1f ベローズ、
2 固定側取付板、2a 貫通穴、2b 曲面部、3 絶縁支持物、
4 連結ロッド、5 絶縁ロッド、6 割端子、6a 嵌合穴、
6b スリット、6c 平面部、6d 取付穴、7 固定側接続端子、
8 可撓導体、9 可動側接続端子、10 スペーサ、11 固定板、
12 締付ねじ、13割端子、13a 嵌合穴、13b スリット、
13c ねじ用穴、13d 取付穴、14 固定側導体、
14a 円板状部、15 接続導体、16 固定側取付板、
17,18 板状部材、18a 曲面部、19 薄板、
20 固定側取付板、20a 貫通穴、20b 固定穴、20c 取付穴、
20d 通気穴。
Claims (10)
- 固定接点及び可動接点が真空容器に収容された真空バルブと、前記固定接点に接続された固定側導体を支持する固定側取付板と、前記固定側取付板を間隔をおいて少なくとも2箇所の支持部で橋状に支持する絶縁支持物と、前記可動接点に接続された可動側導体に連結されて前記両接点を開閉操作する操作機構とを備えた開閉機器において、
前記固定側取付板は、複数の板状部材が重ね合わされて構成され、
前記真空バルブの前記固定側導体が直接または衝撃力伝達手段を介して前記固定側取付板の前記2箇所の支持部のほぼ中央で支持されていることを特徴とする開閉機器。 - 請求項1記載の開閉機器において、
前記固定側取付板は、2枚の板状部材を重ね合わせて構成したことを特徴とする開閉機器。 - 固定接点及び可動接点が真空容器に収容された真空バルブと、前記固定接点に接続された固定側導体を支持する固定側取付板と、内部に前記真空バルブを収容し一端側に前記固定側取付板が固着される筒状の絶縁支持物と、前記可動接点に接続された可動側導体に連結されて前記両接点を開閉操作する操作機構とを備えた開閉機器において、
前記固定側取付板は、複数枚の板状部材が重ね合わされて構成され、
前記真空容器の外部に露出する前記固定側導体の露出部に、前記露出部と嵌合する嵌合穴を有し前記嵌合穴から径方向にスリットが形成された割端子が装着され、
前記割端子が前記固定側取付板に固定されて、前記真空バルブの前記固定側導体が前記割端子を介し前記固定側取付板に支持されていることを特徴とする開閉機器。 - 請求項1~請求項3のいずれか1項に記載の開閉機器において、
前記固定側取付板は、外形が同形状の2枚の板状部材が重ね合わされて構成されていることを特徴とする開閉機器。 - 請求項1~請求項3のいずれか1項に記載の開閉機器において、
前記固定側取付板は、外形の大きさの異なる2枚の板状部材からなり、大きい外形の板状部材の一面に凹部が形成され、小さい外形の板状部材が前記凹部に嵌め込まれ重ね合わされて構成されていることを特徴とする開閉機器。 - 請求項4又は請求項5に記載の開閉機器において、
前記2枚の板状部材からなる前記固定側取付板の板間に、前記固定側取付板より剛性が低く厚さの薄い薄板が挟み込まれていることを特徴とする開閉機器。 - 請求項1~請求項6のいずれか1項に記載の開閉機器において、
重ね合わされた前記固定側取付板の外周の角部となる部分は、曲面に形成されていることを特徴とする開閉機器。 - 請求項1~請求項7のいずれか1項に記載の開閉機器において、
前記固定側取付板の中心部に貫通穴が設けられ、前記真空バルブの前記固定側導体又は固定側接続端子が、前記貫通穴を貫通して前記固定側取付板の外部に引き出されていることを特徴とする開閉機器。 - 請求項1~請求項8のいずれか1項に記載の開閉機器において、
前記固定側取付板と前記絶縁支持物との固着部にスペーサが介装されていることを特徴とする開閉機器。 - 請求項1~請求項9のいずれか1項に記載の開閉機器において、
前記固定側取付板に、前記絶縁支持物の内部側へ通じる通気穴が設けられていることを特徴とする開閉機器。
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JP2005259562A (ja) * | 2004-03-12 | 2005-09-22 | Mitsubishi Electric Corp | ガス絶縁開閉装置 |
JP2006164654A (ja) | 2004-12-06 | 2006-06-22 | Mitsubishi Electric Corp | 開閉機器 |
WO2009125467A1 (ja) * | 2008-04-07 | 2009-10-15 | 三菱電機株式会社 | 真空遮断器及びそれを用いたガス絶縁開閉装置 |
WO2011111086A1 (ja) * | 2010-03-08 | 2011-09-15 | 三菱電機株式会社 | 電力用遮断器 |
Also Published As
Publication number | Publication date |
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CN104798167A (zh) | 2015-07-22 |
CN104798167B (zh) | 2016-07-27 |
EP2924703B1 (en) | 2018-07-18 |
EP2924703A1 (en) | 2015-09-30 |
US9305725B2 (en) | 2016-04-05 |
EP2924703A4 (en) | 2016-07-27 |
JP5714192B2 (ja) | 2015-05-07 |
JPWO2014080655A1 (ja) | 2017-01-05 |
US20150248977A1 (en) | 2015-09-03 |
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