EP2686859B1 - Gas-insulated high-voltage circuit breaker - Google Patents
Gas-insulated high-voltage circuit breaker Download PDFInfo
- Publication number
- EP2686859B1 EP2686859B1 EP11708497.0A EP11708497A EP2686859B1 EP 2686859 B1 EP2686859 B1 EP 2686859B1 EP 11708497 A EP11708497 A EP 11708497A EP 2686859 B1 EP2686859 B1 EP 2686859B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit breaker
- volume
- valve
- gas
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000007789 gas Substances 0.000 claims description 83
- 230000006835 compression Effects 0.000 claims description 64
- 238000007906 compression Methods 0.000 claims description 64
- 238000010438 heat treatment Methods 0.000 claims description 24
- 229910000639 Spring steel Inorganic materials 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 4
- 230000000171 quenching effect Effects 0.000 claims description 4
- 102220545768 116 kDa U5 small nuclear ribonucleoprotein component_C60S_mutation Human genes 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 102200078301 rs121908250 Human genes 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims 2
- 239000010959 steel Substances 0.000 claims 2
- 238000007664 blowing Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 241001136792 Alle Species 0.000 description 1
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 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
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/86—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid under pressure from the contact space being controlled by a valve
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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
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
- H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
-
- 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
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
- H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
- H01H33/901—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism making use of the energy of the arc or an auxiliary arc
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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
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
- H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
- H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
-
- 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
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
- H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
- H01H2033/906—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism with pressure limitation in the compression volume, e.g. by valves or bleeder openings
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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
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
- H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
- H01H2033/908—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism using valves for regulating communication between, e.g. arc space, hot volume, compression volume, surrounding volume
Definitions
- the invention relates to the field of high voltage engineering and relates to a usable in the voltage range between several kV and several hundred kV, gas-insulated high-voltage circuit breaker according to the preamble of claim 1.
- Such a switch also called gas blast switch, is used in particular in power distribution networks. It is designed in such a way that, in the event of a separation of the contacts or in the event of a short circuit, a switching arc is blown out with gas and thereby extinguished as quickly as possible.
- the most commonly used gas for this purpose is SF 6 (sulfur hexafluoride).
- a switch of the type mentioned is in DE 4211159 A1 and US 5589673 A described.
- a pressure chamber in which the arc is formed valve-controlled connected to a compression chamber.
- the compression chamber is connected via a pressure relief valve and a refill valve with a low pressure chamber.
- the valves are annular and arranged adjacent to one another with an overlap zone.
- the pressure relief valve is pressed on the low pressure chamber side by a spring in the direction of the compression volume against a valve holder.
- gas can only flow from the compression volume into the low-pressure space when its pressure is greater than the spring force.
- this construction is relatively complicated and requires many elements.
- EP 2270828 A1 a designed as a self-inflating high-voltage circuit breaker, in which between two volumes of its extinguishing chamber, a check valve is arranged.
- This valve has at least one metallic, flexible plate, which is movable between a valve seat and a stop of the valve within its elastic deformability.
- the valve is designed to allow the supply of compressed, cool gas from a compression volume into a heating volume exposed to the action of arc gases when the switch is opened, but prevents hot arc gases from flowing from the heating volume into the compression volume. Therefore, a material is used for the at least one plate, which can withstand temperatures up to 2500 ° C.
- the construction of the gas-insulated high-voltage circuit breaker of the type mentioned is to be simplified and the number of required components can be reduced.
- the valve plate has at least one hole and at least one held on one side, depending on the pressure of the insulating gas in the compression volume elastically bendable leaf spring, which closes the hole when closing the switch and the hole opens when opening the switch and a guided through the hole flow channel for Insulating gas emerging from the compression volume is limited as soon as the pressure of the compressed insulating gas in the compression volume exceeds the value of the gas pressure in the low-pressure space by at least two bar.
- the valve Compared to the closest prior art, in which the valve arranged between the compression volume and the low-pressure volume has two annular, overlapping valve plates and a valve spring, the valve only requires a single valve plate in the switch according to the invention. Compared to the prior art, therefore, a valve plate and a spring can be saved. Since now instead of two overlapping valve plates and a spring to be adjusted only a single valve plate is to be installed in the valve, the inventive switch can be made much easier and maintained.
- this single valve plate has at least one hole and a hole normally closing the leaf spring, which opens only above an overpressure of two bar due to elastic bending the hole and thereby connects the compression volume with the low pressure volume, with this single valve plate not only the targeted filling of Compression volume achieved with fresh insulating gas during the closing of the switch, but at the same time a more than two bar amounting excess pressure in the compression volume is effectively limited when opening the switch.
- the leaf spring has a relatively high spring constant and, accordingly, a strong restoring force. Therefore, it is not necessary to limit the travel of the leaf spring even when high overpressures by a fixed stop limiting the bending of the leaf spring.
- the leaf spring can be formed by means of at least one cut in the valve plate. This section can be guided perpendicular to the surface of the valve plate. Alternatively, at least a portion of the at least one cut may be inclined relative to the surface of the valve plate. The angle of inclination should then be no more than 60 °.
- the valve plate may be made of a spring plate, the thickness of which is selected in relation to the length of the leaf spring so that when bending the leaf spring prevents plastic deformation and the hole is released when the threshold value is exceeded.
- the valve plate may be formed as an annular disc, and the at least one leaf spring with respect to a center of the annular disc designed as a circular section and have at least three cut into the annular disc sides, of which at least one is radially aligned and at least two are guided concentrically.
- the annular disc may comprise a plurality of leaf springs, which are each formed with respect to the center of the annular disc as a circular section and each have at least three cut into the annular disc sides, of which at least one is radially aligned and at least two are guided concentrically, wherein each two of the leaf springs are mirror images of each other with respect to a diameter line of the annular disc are arranged.
- the valve plate and the at least one leaf spring may be formed of a standard spring steel, which is designed as unalloyed or low-alloyed stainless steel.
- a standard spring steel is only suitable for use at operating temperatures up to about 300 ° C.
- Fig. 1 shows a cross section along a longitudinal axis 11 of an embodiment of a gas-insulated high-voltage circuit breaker 1 according to the invention.
- the switch is designed as a self-blowing switch and has a non-illustrated, with an insulating gas, in particular SF 6 , filled by some bar pressure housing that a low-pressure volume 5 limited to the outside.
- a first and right of the longitudinal axis 11 a second operating state of the switch 1 is shown, which are referred to below filling operation or overpressure operation.
- the switch 1 has a rated current contact 2c, which is movable in the direction of the longitudinal axis 11 of the switch 1 such that it can come into contact with a rated current contact 2d. Furthermore, the switch has an arcing contact 2a, which is movable in the direction of the longitudinal axis 11 of the switch 1 such that it can come into contact with an arcing contact 2b.
- the reference numeral 15 is a Arc, which results from the interruption of a current after the separation of the two arcing contacts 2a, 2b. When switching off an operating current, the arc 15 is usually weak. When switching off a short-circuit current but very strong arcs 15 may occur. These two options will be described in more detail later in the description, since they require a separate procedure for extinguishing the arc 15.
- the extinguishing of the arc 15 is carried out by blowing the arc 15 burning in an arc zone 3 with an extinguishing gas which has a higher pressure than the insulating gas present in the low-pressure volume 5.
- Extinguishing gas can be formed by the switching arc 15, the arc gases are stored in the high-current phase of the current to be disconnected in a heating volume 19 and flows at zero current through a heating channel 17 in the arc zone 3 and the arc 15 cools.
- the heating channel 17 is typically formed between an auxiliary nozzle 16a and a main nozzle 16b.
- Extinguishing gas can be provided when opening the switch at the same time in a compression volume 4, which is part of a driven by a drive A of the switch compression device.
- the switch according to the invention can also be designed as a buffer switch.
- the arc gases can then enter directly into the compression volume 4 when opening the switch from the arc zone.
- the self-inflator shown is the heating volume 19 by means of a check valve 14 separated from the compression volume 4. Both the Doubles- and the buffer switch, however, the compression volume 4 is separated by means of a valve 6 from the low pressure volume 5.
- the low-pressure volume 5 is generally designed as an exhaust volume, but may also have a volume separated from the exhaust volume, in which even after opening the switch fresh, is stored by exhaust gases largely free insulating gas.
- a flow 12 When closing the switch, a flow 12 is formed, the insulating gas from the low pressure volume 5 through the valve 6 in the compression chamber 4 leads (left of the axis 11 located part of FIGS. 1 and 1a ).
- a flow 13 forms as soon as the compression volume 4 has an overpressure of at least two bar relative to the low-pressure volume 5. This flow leads compressed, serving as quenching gas insulating gas from the compression volume 4 in the reverse direction in the low pressure volume 5 (right of the axis 11 located part of FIGS. 1 and 1a ).
- the valve plate 9 is formed as an annular disc, which is guided around the longitudinal axis 11 of the switch 1.
- valve plate 9 has a hole 71 and a one-sided, in Dependent on the pressure of the insulating gas in the compression volume 4 elastically bendable leaf spring 7 has.
- the switch 1 also comprises a subelement 21 containing a piston of the compression device and an upper element 20 containing a cylinder of the compression device.
- the upper element 20 is displaceably arranged in the direction of the longitudinal axis 11 and the subelement 21 is fixed.
- the top element 20, to which the arcing contact 2a is attached is displaced in the direction away from the second arcing contact 2b.
- Fig. 2 shows in the figures a to d different embodiments of the valve plate 9.
- the valve plates 9 are each designed as an annular disc with an outer edge 18a and an inner edge 18b.
- the shapes which result from the lines shown within the edges 18a, 18b correspond to a plurality of leaf springs 7.
- Each leaf spring 7 is cut into the annular disc over the entire thickness of the annular disc.
- the lines illustrate the incisions in the material of the annular disc.
- valve plate 9 is interchangeable with another valve plate 9 of different thickness and different shaped leaf springs 7 and holes 71. This allows an adaptation of the switch 1 according to the invention to subsequently explained parameters, such as the gas flow rate and the threshold value of the overpressure.
- the shapes of the leaf springs 7 are related to the desired maximum gas flow rate in the case of the flow 13 Fig.2 As can be seen, determines the extent of the incisions, which form the leaf springs 7, the flow cross-section of a guided through the valve plate and the flow 13 receiving flow channel. For a given size of the overpressure can be varied by suitable choice of the circumference of the leaf springs 7 or by selecting the size of the flow cross section, the gas flow rate per unit time.
- the spring constant of the leaf spring 7 changes, wherein the leaf spring 7 preferably has the same thickness as the valve plate 9
- a thicker leaf spring 7 causes a higher spring constant resp. a higher elastic restoring force and a thinner leaf springs 7 a lower spring constant resp. a lower elastic restoring force.
- the spring constant or thickness of the leaf spring 7 together with the length of the leaf spring significantly determines the response of the valve 6 against the occurrence of excess pressure in the compression volume 4.
- Beivier higher spring constant a higher pressure is required to deflect the leaf spring 7. Accordingly, a lower overpressure is needed at a lower spring rate.
- the thickness and the length resp. Shape of the leaf spring 7 are variables by which the desired threshold value of the overpressure for the realization of the flow 13 is adjustable.
- the maximum gas flow rate and the threshold value of the overpressure for the formation of the flow 13 in the switch 1 in the simplest manner are adjustable by the exchange of differently shaped valve plates 9.
- the switch 1 can be designed for use as an outdoor switch or as a metal-enclosed switch.
- FIG. 3 and 4 which is preferably formed as an annular disc valve plate 9 at least one leaf spring 7, which as a circular ring portion with respect to the center of the valve plate or annular disc with a radial Cut 72 and two concentric sections 73, 74 was cut into the valve plate or washer.
- annular disc has three leaf springs 7.
- each leaf spring 7 which also, as explained above, each as a circular ring sections with respect to the center of the annular disc with each pure radial 72 and two concentric sections 73, 74 were cut into the annular disc.
- Each two of the leaf springs are arranged in mirror image to each other with respect to a diameter line 22 of the annular disc.
- four leaf springs 7a, 7b, 7c, 7d are shown, wherein a first and a second leaf spring 7a, 7b and a third and a fourth leaf spring 7c, 7d are each arranged in mirror image to each other with respect to the diameter line 22 of the annular disc.
- valve plate 9 in particular prevents a propeller effect, which could arise in an orientation of all spring elements in a clockwise or counterclockwise direction.
- the opposing orientation of each two spring elements prevents the annular disc could be placed in a rotational movement during the formation of the gas flow 13.
- an odd number of leaf springs can be selected.
- an annular disc could after Fig. 3
- two oppositely disposed leaf springs 7, wherein the orientation of the unassigned leaf springs would not matter because frictional forces would sufficiently counteract a remaining rotational tendency of the annular disc.
- the check valve prevents hot arc gases flowing into the heating volume 19 from entering the compression volume 4 can.
- the valve 6 is therefore not exposed to excessively high temperatures.
- the valve plate 9 and accordingly also the at least one leaf spring 7 can therefore be formed from a standard spring steel.
- Particularly suitable is a standard spring steel made of plain or low-alloy stainless steel, such as a stainless steel commercially available under the short name C60S, C75S or 51CrV4.
- the cuts 72 to 74 are like out Figure 5 can be seen generally perpendicular to the surface of the valve plate 9. On the cutting tool no particularly high demands are made, so that then the valve plate 9 and thus the switch 1 can be made particularly economical.
- the cuts 72 to 74 relative to the surface of the valve plate 9 can also be guided inclined.
- the angle of inclination relative to the surface of the valve plate 9 is dimensioned so that the leaf spring 7 bend upon reaching the overpressure of at least 2 bar and the hole 71 can release.
- the leaf spring rests with an outer edge 76 which determines its contour and has an obliquely folded edge on an inner edge 75 which determines the contour of the hole 71.
- the inclination angle, starting from the 90 ° vertical section, is less than 60 °, typically less than 50 ° and greater than 20 °, the width of the edges 75, 76 is effectively extended and, accordingly, the leakage losses in the compression volume 4 are reduced.
- the gas volume increases as soon as the gas in the arc zone 3 is substantially heated by an arc 15 which is produced when the arc contacts 2 a, 2 b are properly disconnected.
- the gas pressure in the arc zone 3 remains at low arc 15, so at weak currents to be interrupted, smaller than the gas pressure in the heating volume 19. Therefore, the gas flows in this case always from the compression volume 4 into the heating volume 19 and through the Heating channel 17 in the arc zone 3, where it inflates the arc 15 in the current zero crossing.
- the pressure in the compression volume 4 increases during the downward movement of the upper element 20 until the pressure of the compressed insulating gas in the compression space 4 exceeds the value of the gas pressure in the low-pressure space 5 by at least two bars. Above this pressure, the leaf spring 7 releases the hole 71 and then delimits a guided through the hole 71 flow channel for emerging from the compression volume 4 insulating. Upon release of the hole 71, the leaf spring 7 clamped on one side is deflected elastically downwards into the low-pressure volume 5 and thus forms the flow channel for the flow 13 directed from the compression volume 4 into the low-pressure volume. An impermissibly high overpressure in the compression space 4 is thus avoided. At the same time as well as the applied by the drive A compression work is limited.
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- Circuit Breakers (AREA)
- Gas-Insulated Switchgears (AREA)
Description
Die Erfindung bezieht sich auf das Gebiet der Hochspannungstechnik und betrifft einen im Spannungsbereich zwischen mehrere kV und mehreren hundert kV einsetzbaren, gasisolierten Hochspannungs-Leistungsschalter nach dem Oberbegriff von Patentanspruch 1.The invention relates to the field of high voltage engineering and relates to a usable in the voltage range between several kV and several hundred kV, gas-insulated high-voltage circuit breaker according to the preamble of
Ein derartiger Schalter, auch Druckgasschalter genannt, kommt insbesondere in Energieverteilungsnetzen zum Einsatz. Er ist derart konzipiert, dass im Falle einer Trennung der Kontakte bzw. im Kurzschlussfall ein Schaltlichtbogen mit Gas beblasen und dadurch schnellstmöglich gelöscht wird. Das meistverwendete Gas für diesen Zweck ist SF6 (Schwefelhexafluorid).Such a switch, also called gas blast switch, is used in particular in power distribution networks. It is designed in such a way that, in the event of a separation of the contacts or in the event of a short circuit, a switching arc is blown out with gas and thereby extinguished as quickly as possible. The most commonly used gas for this purpose is SF 6 (sulfur hexafluoride).
Ein Schalter der eingangsgenannten Art ist in
Ein Schalter der eingangs genannte Art ist auch in der älteren europäischen Anmeldung
Ferner beschreibt
Zu verweisen ist auch auf
Durch die vorliegende Erfindung soll die Bauweise des gasisolierten Hochspannungs-Leistungsschalters der eingangs genannten Art vereinfacht und die Anzahl erforderlicher Bauteile reduziert werden.By the present invention, the construction of the gas-insulated high-voltage circuit breaker of the type mentioned is to be simplified and the number of required components can be reduced.
Der gasisolierte Schalter nach der Erfindung enthält eine von einem Antrieb des Schalters betätigte Kompressionsvorrichtung mit einem mit Isoliergas gefülltes Kompressionsvolumen, in dem das Isoliergas beim Öffnen des Schalters zu Löschgas verdichtet wird, ein mit Isoliergas gefülltes Niederdruckvolumen, und ein das Kompressions- und das Niederdruckvolumen miteinander verbindendes Ventil, durch welches beim Schliessen des Schalters Isoliergas aus dem Niederdruckvolumen in das Kompressionsvolumen strömt, und durch welches beim Öffnen des Schalters oberhalb eines Schwellwerts des Löschgasdrucks Isoliergas aus dem Kompressionsvolumen im umgekehrter Richtung ins Niederdruckvolumen strömt, wobei das Ventil folgende Elemente aufweist:
- einen durch die Wand des Kompressionsraums geführten Ventilkörper mit einem das Kompressions- und das Niederdruckvolumen verbindenden Gasdurchlass und einem den Gasdurchlass umfassenden Ventilsitz,
- eine vom Isoliergas betätigte, verschiebbar im Ventilkörper gelagerte Ventilplatte, welche beim Öffnen des Schalters auf dem Ventilsitz aufsitzt, sowie
- einen in den Ventilkörper integrierten Anschlag, der die Bewegung der Ventilplatte beim Schliessen des Schalters begrenzt.
- a valve body guided through the wall of the compression space and having a gas passage connecting the compression and low pressure volumes and a valve seat including the gas passage;
- an actuated by the insulating gas, slidably mounted in the valve body valve plate, which is seated when opening the switch on the valve seat, and
- a stop integral with the valve body which limits movement of the valve plate when the switch is closed.
Die Ventilplatte weist mindestens ein Loch und mindestens eine einseitig gehaltene, in Abhängigkeit vom Druck des Isoliergases im Kompressionsvolumen elastisch verbiegbare Blattfeder auf, welche beim Schliessen des Schalters das Loch verschliesst und beim Öffnen des Schalters das Loch freigibt und einen durch das Loch geführten Strömungskanal für das aus dem Kompressionsvolumen austretende Isoliergas begrenzt, sobald der Druck des verdichteten Isoliergases im Kompressionsvolumen den Wert des Gasdrucks im Niederdruckraum um mindestens zwei bar übertrifft.The valve plate has at least one hole and at least one held on one side, depending on the pressure of the insulating gas in the compression volume elastically bendable leaf spring, which closes the hole when closing the switch and the hole opens when opening the switch and a guided through the hole flow channel for Insulating gas emerging from the compression volume is limited as soon as the pressure of the compressed insulating gas in the compression volume exceeds the value of the gas pressure in the low-pressure space by at least two bar.
Verglichen mit dem nächstliegenden Stand der Technik, bei dem das zwischen Kompressionsvolumen und Niederdruckvolumen angeordnete Ventil zwei ringförmige, sich überlappende Ventilplatten und eine Ventilfeder aufweist, benötigt das Ventil beim erfindungsgemässen Schalter lediglich eine einzige Ventilplatte. Gegenüber dem Stand der Technik werden daher eine Ventilplatte und eine Feder eingespart. Da anstelle zweier sich überlappender Ventilplatten und einer zu justierenden Feder nunmehr lediglich eine einzige Ventilplatte in das Ventil einzubauen ist, kann der erfindungsgemässe Schalter wesentlich leichter gefertigt und gewartet werden. Da diese einzige Ventilplatte mindestens ein Loch und eine das Loch normalerweise verschliessende Blattfeder aufweist, die erst oberhalb eines Überdrucks von zwei bar infolge elastischer Verbiegung das Loch öffnet und dabei das Kompressionsvolumen mit dem Niederdruckvolumen verbindet, wird mit dieser einzigen Ventilplatte nicht nur das gezielte Befüllen des Kompressionsvolumens mit frischem Isoliergas während des Schliessens des Schalters erreicht, sondern wird beim Öffnen des Schalters zugleich ein mehr als zwei bar betragender Überdruck im Kompressionsvolumen wirksam begrenzt. Die Blattfeder weist eine relativ hohe Federkonstante und dementsprechend auch eine starke Rückstellkraft auf. Daher ist es nicht erforderlich, den Weg der Blattfeder selbst beim Auftreten hoher Überdrücke durch einen die Verbiegung der Blattfeder limitierenden, feststehenden Anschlag zu begrenzen.Compared to the closest prior art, in which the valve arranged between the compression volume and the low-pressure volume has two annular, overlapping valve plates and a valve spring, the valve only requires a single valve plate in the switch according to the invention. Compared to the prior art, therefore, a valve plate and a spring can be saved. Since now instead of two overlapping valve plates and a spring to be adjusted only a single valve plate is to be installed in the valve, the inventive switch can be made much easier and maintained. Since this single valve plate has at least one hole and a hole normally closing the leaf spring, which opens only above an overpressure of two bar due to elastic bending the hole and thereby connects the compression volume with the low pressure volume, with this single valve plate not only the targeted filling of Compression volume achieved with fresh insulating gas during the closing of the switch, but at the same time a more than two bar amounting excess pressure in the compression volume is effectively limited when opening the switch. The leaf spring has a relatively high spring constant and, accordingly, a strong restoring force. Therefore, it is not necessary to limit the travel of the leaf spring even when high overpressures by a fixed stop limiting the bending of the leaf spring.
Die Blattfeder kann mit Hilfe mindestens eines Schnitts in die Ventilplatte eingeformt werden. Dieser Schnitt kann senkrecht zur Oberfläche der Ventilplatte geführt sein. Alternativ kann mindestens ein Abschnitt des mindestens einen Schnitts gegenüber der Oberfläche der Ventilplatte geneigt geführt sein. Der Neigungswinkel sollte dann höchstens 60° betragen.The leaf spring can be formed by means of at least one cut in the valve plate. This section can be guided perpendicular to the surface of the valve plate. Alternatively, at least a portion of the at least one cut may be inclined relative to the surface of the valve plate. The angle of inclination should then be no more than 60 °.
Die Ventilplatte kann aus einem Federblech gefertigt sein, dessen Dicke im Verhältnis zur Länge der Blattfeder so gewählt ist, dass beim Verbiegen der Blattfeder eine plastische Verformung vermieden und beim Überschreiten des Schwellwerts das Loch freigegeben wird.The valve plate may be made of a spring plate, the thickness of which is selected in relation to the length of the leaf spring so that when bending the leaf spring prevents plastic deformation and the hole is released when the threshold value is exceeded.
Die Ventilplatte kann als Ringscheibe ausgebildet sein, und die mindestens eine Blattfeder bezüglich eines Mittelpunkts der Ringscheibe als Kreisabschnitt ausgeführt sein und mindestens drei in die Ringscheibe eingeschnittene Seiten aufweisen, von denen mindestens eine radial ausgerichtet ist und mindestens zwei konzentrisch geführt sind.The valve plate may be formed as an annular disc, and the at least one leaf spring with respect to a center of the annular disc designed as a circular section and have at least three cut into the annular disc sides, of which at least one is radially aligned and at least two are guided concentrically.
Die Ringscheibe kann eine Mehrzahl von Blattfedern aufweisen, welche bezüglich des Mittelpunkts der Ringscheibe jeweils als Kreisabschnitt ausgebildet sind und jeweils mindestens drei in die Ringscheibe eingeschnittene Seiten aufweisen, von denen mindestens eine radial ausgerichtet ist und mindestens zwei konzentrisch geführt sind, wobei je zwei der Blattfedern spiegelbildlich zueinander bezüglich einer Durchmesserlinie der Ringscheibe angeordnet sind.The annular disc may comprise a plurality of leaf springs, which are each formed with respect to the center of the annular disc as a circular section and each have at least three cut into the annular disc sides, of which at least one is radially aligned and at least two are guided concentrically, wherein each two of the leaf springs are mirror images of each other with respect to a diameter line of the annular disc are arranged.
Bei einem Schalter mit einem mit dem Kompressionsvolumen über ein Rückschlagventil verbundenen Heizvolumen zur Aufnahme von Lichtbogengasen kann die Ventilplatte und die mindestens eine Blattfeder aus einem Standardfederstahl gebildet sein, der als unlegierter oder niedriglegierter Edelstahl ausgeführt ist. Im Unterschied zum Stand der Technik nach
Weitere Ausgestaltungen, Vorteile und Anwendungen der Erfindung ergeben sich aus der nun folgenden Beschreibung anhand der Figuren. Dabei zeigen:
-
Fig. 1 einen Querschnitt entlang der Längsachse einer als Selbstblasschalter ausgeführten Ausführungsform des Hochspannungs-Leistungsschalters nach der Erfindung, -
Fig. 1a eine Vergrösserung eines ein inFig.1 umrandet dargestellter Bereichs des Schalters nachFig.1 , -
Figuren 2 bis 4 jeweils in Draufsicht Ausführungsformen einer Ventilplatte eines Ventils des Schalters nachFig.1 , -
Fig. 5 eine Aufsicht in Pfeilrichtung auf einen längs IV - IV geführten Schnitt durch die Ausführungsform der Ventilplatte gemässFig.4 , und -
Fig. 6 eine Aufsicht in Pfeilrichtung auf einen längs IV - IV geführten Schnitt durch eine modifizierte Ausführungsform der Ventilplatte gemässFig.4 .
-
Fig. 1 a cross section along the longitudinal axis of an embodiment of the high-voltage circuit breaker according to the invention, which is designed as a self-blowing switch, -
Fig. 1a an enlargement of an inFig.1 frames framed area of the switchFig.1 . -
FIGS. 2 to 4 each in plan view embodiments of a valve plate of a valve of the switch toFig.1 . -
Fig. 5 a view in the direction of arrow on a longitudinal IV - IV guided section through the embodiment of the valve plate according toFigure 4 , and -
Fig. 6 a view in the direction of arrow on a longitudinal IV - IV guided section through a modified embodiment of the valve plate according toFigure 4 ,
Die in den Figuren verwendeten Bezugszeichen und deren Bedeutung sind in der Bezugszeichenliste zusammengefasst aufgelistet. Für das Verständnis der Erfindung nicht wesentliche Teile sind teilweise nicht dargestellt. Die beschriebenen Ausführungsformen stehen beispielhaft für den Erfindungsgegenstand und haben keine beschränkende Wirkung, vielmehr kann die Erfindung auch in anderer Weise innerhalb des Umfangs der Patentansprüche ausgeführt werden.The reference numerals used in the figures and their meaning are listed in the list of reference numerals. For the understanding of the invention non-essential parts are partially not shown. The described embodiments are exemplary of the subject invention and have no limiting effect, but the invention may be practiced otherwise within the scope of the claims.
Der Schalter 1 verfügt über einen Nennstromkontakt 2c, welcher derart in Richtung der Längsachse 11 des Schalters 1 bewegbar ist, dass er mit einem Nennstromkontakt 2d in Berührung treten kann. Weiter verfügt der Schalter über einen Lichtbogenkontakt 2a, welcher derart in Richtung der Längsachse 11 des Schalters 1 bewegbar ist, dass er mit einem Lichtbogenkontakt 2b in Berührung treten kann. Mit dem Bezugszeichen 15 ist ein Lichtbogen bezeichnet, der beim Unterbrechen eines Stroms nach dem Trennen der beiden Lichtbogenkontakte 2a, 2b entsteht. Bei der Abschaltung eines Betriebsstroms ist der Lichtbogen 15 in der Regel schwach. Beim Abschalten eines Kurzschlussstroms können jedoch sehr starke Lichtbögen 15 auftreten. Auf diese zwei Möglichkeiten wird im weiteren Verlauf der Beschreibung näher eingegangen, denn sie erfordern eine getrennte Vorgehensweise bei der Löschung des Lichtbogens 15.The
Die Löschung des Lichtbogens 15 erfolgt durch Beblasen des in einer Lichtbogenzone 3 brennenden Lichtbogens 15 mit einem Löschgas, das gegenüber dem im Niederdruckvolumen 5 befindlichen Isoliergas einen höheren Druck aufweist. Löschgas kann durch den Schaltlichtbogen 15 gebildet werden, dessen Lichtbogengase in der Hochstromphase des abzuschaltenden Stroms in einem Heizvolumen 19 gespeichert werden und beim Stromnulldurchgang durch einen Heizkanal 17 in die Lichtbogenzone 3 strömt und den Lichtbogen 15 kühlt. Der Heizkanal 17 ist typischerweise zwischen einer Hilfsdüse 16a und einer Hauptdüse 16b geformt. Löschgas kann beim Öffnen des Schalters zugleich auch in einem Kompressionsvolumen 4 bereitgestellt werden, das Teil einer von einem Antrieb A des Schalters betätigten Kompressionsvorrichtung ist.The extinguishing of the
Anstelle als Selbstblasschalter kann der erfindungsgemässe Schalter auch als Pufferschalter ausgebildet sein. Die Lichtbogengase können dann beim Öffnen des Schalters aus der Lichtbogenzone direkt ins Kompressionsvolumen 4 eintreten.Instead of a self-blow switch, the switch according to the invention can also be designed as a buffer switch. The arc gases can then enter directly into the
Bei dem in den
Beim Schliessen des Schalters bildet sich eine Strömung 12 aus, die Isoliergas aus dem Niederdruckvolumen 5 durch das Ventil 6 in den Kompressionsraum 4 führt (links der Achse 11 gelegener Teil der
Aus
- einen durch eine Wand des
Kompressionsraums 4 geführten Ventilkörper 30 mit einem das Kompressions- 4und das Niederdruckvolumen 5 verbindenden Gasdurchlass 31 und einem denGasdurchlass umfassenden Ventilsitz 32, - eine vom Isoliergas betätigte,
verschiebbar im Ventilkörper 30gelagerte Ventilplatte 9, welche beim Öffnen des Schalters aufdem Ventilsitz 32 gasdicht aufsitzt (rechte Hälfte vonFig.1a ), sowie - einen in
den Ventilkörper 30 integrierten Anschlag 8, der dieBewegung der Ventilplatte 9 beim Schliessen des Schalters nach oben begrenzt (linke Hälfte vonFig.1a ) und auf der vom Ventilsitz 32 abgewandten Seite derVentilplatte 9 angeordnet ist. Die Lage des Anschlags 8 bestimmt den maximalen Abstand, um den dieVentilplatte 9vom Ventilsitz 32 angehoben werden kann.
- a
valve body 30 guided through a wall of thecompression space 4 with a gas passage 31 connecting thecompression 4 and thelow pressure volume 5 and avalve seat 32 including the gas passage, - an actuated by the insulating gas, slidably mounted in the
valve body 30valve plate 9, which sits gas-tight upon opening of the switch on the valve seat 32 (right half of1a ), such as - an integrated into the
valve body 30 stop 8, which limits the movement of thevalve plate 9 when closing the switch upwards (left half of1a ) and on the side remote from thevalve seat 32 side of thevalve plate 9 is arranged. The position of the stop 8 determines the maximum distance by which thevalve plate 9 can be lifted from thevalve seat 32.
Die Ventilplatte 9 ist ersichtlich als Ringscheibe ausgebildet, die um die Längsachse 11 des Schalters 1 geführt ist.The
Aus
Der erfindungsgemässe Schalter 1 umfasst auch ein einen Kolben der Kompressionsvorrichtung enthaltendes Unterelement 21 und ein einen Zylinder der KompressionsVorrichtung enthaltendes Oberelement 20. Im gezeigten Ausführungsbeispiel ist das Oberelement 20 in Richtung der Längsachse 11 verschiebbar angeordnet und das Unterelement 21 ist fest. Bei einer Trennung der beiden Lichtbogenkontakte 2a und 2b wird das Oberelement 20, an welchem der Lichtbogenkontakt 2a angebracht ist, in Richtung weg vom zweiten Lichtbogenkontakt 2b verschoben.The
Die Ventilplatte 9 ist mit einer anderen Ventilplatte 9 unterschiedlicher Dicke und verschieden geformten Blattfedern 7 und Löchern 71 austauschbar. Dies erlaubt eine Anpassung des erfindungsgemässen Schalters 1 an nachfolgend erläuterte Parameter, wie Gasdurchlassmenge und Schwellwert des Überdrucks.The
Die Formen der Blattfedern 7 stehen im Zusammenhang mit der gewünschten maximalen Gasdurchlassmenge im Falle der Strömung 13. Wie aus
Wird die Dicke der Ventilplatte 9 variiert, so ändert sich die Federkonstante der Blattfeder 7, wobei die Blattfeder 7 bevorzugt dieselbe Dicke wie die Ventilplatte 9 aufweist Eine dickere Blattfeder 7 bewirkt eine höhere Federkonstante resp. eine höhere elastische Rückstellkraft und eine dünnere Blattfedern 7 eine niedrigere Federkonstante resp. eine niedrigere elastische Rückstellkraft. Die Federkonstante bzw. Dicke der Blattfeder 7 bestimmt zusammen mit der Länge der Blattfeder (Strecke zwischen den Ansatz am Material der Ringscheibe 9 und dem freien Ende der Feder 7) massgeblich das Ansprechverhalten des Ventils 6 gegenüber dem Auftreten von Überdruck im Kompressionsvolumen 4. Bei einer höheren Federkonstante wird ein höherer Überdruck benötigt, um die Blattfeder 7 auszulenken. Entsprechend wird bei einer niedrigeren Federkonstante ein niedrigerer Überdruck benötigt. Die Dicke und die Länge resp. Form der Blattfeder 7 sind Variable, durch welche der gewünschte Schwellwert des Überdrucks zur Realisierung der Strömung 13 einstellbar ist.If the thickness of the
Man kann also eine elastische Rückstellkraft oder Federkonstante einstellen, indem eine Elastizität und/oder Form der Blattfeder 7 nach Massgabe eines vorgebbaren Schwellwerts des Überdrucks gewählt wird, und man kann eine definierten Strömungsquerschnitt durch die Ventilplatten 9 nach Massgabe einer vorgebbaren Gasdurchlassmenge wählen. Damit sind auch durch den Austausch von verschieden geformten Ventilplatten 9 die maximale Gasdurchlassmenge und der Schwellwert des Überdruck für das Zustandekommen der Strömung 13 im Schalter 1 auf einfachste Weise einstellbar.So you can set an elastic restoring force or spring constant by an elasticity and / or shape of the
Der Schalter 1 ist für den Einsatz als Freiluftschalter oder als metallgekapselter Schalter ausbildbar.The
In einer bevorzugten Ausführungsform (
In dem Ausführungsbeispiel nach
In der Ausführungsform nach
Abhängig von der Dimensionierung des erfindungsgemässen Selbstblasschalters 1 kann selbstverständlich auch eine ungerade Anzahl von Blattfedern gewählt werden. Beispielsweise könnte eine Ringscheibe nach
Ist der erfindungsgemässe Schalter als Selbstblasschalter ausgeführt, so verhindert das Rückschlagventil, dass ins Heizvolumen 19 einströmende, heisse Lichtbogengase ins Kompressionsvolumen 4 eintreten können. Das Ventil 6 ist daher keinen übermässig hohen Temperaturen ausgesetzt. Die Ventilplatte 9 und dementsprechend auch die mindestens eine Blattfeder 7 können daher aus einem Standardfederstahl gebildet sein. Besonders geeignet ist ein als unlegierter oder niedriglegierter Edelstahl ausgeführter Standardfederstahl, wie etwa ein im Handel unter dem Kurznamen C60S, C75S oder 51CrV4 erhältlicher Edelstahl.If the switch according to the invention is designed as a self-blowing switch, the check valve prevents hot arc gases flowing into the
Die Schnitte 72 bis 74 sind wie aus
Wie aus
Der erfindungsgemässe Schalter wirkt wie folgt:
- Im geschlossenen Schalter fliesst Strom in einem die geschlossenen Kontakte
2a bis 2d enthaltenden Stromkreis. Vor einer Schalthandlung sind typischerweise alle Volumina mit dem Gas gleichen Drucks gefüllt. Druckunterschiede und Gasströmungen, wie z.B. dieStrömungen 12 bzw. 13, entstehen erst durch eine Schalthandlung, also z.B. beim Öffnen des Schalters und dem damit verbundenen Trennen der Kontakte2a bis 2d.
- In the closed switch, current flows in a circuit containing the
closed contacts 2a to 2d. Before a switching operation, all volumes are typically filled with the gas of the same pressure. Pressure differences and gas flows, such as the 12 and 13, arise only by a switching action, so for example when opening the switch and the associated separation of thecurrents contacts 2a to 2d.
Beim Trennen des Stromkreises, d.h. bei einer Bewegung des oberen Elements 20 in Richtung der Längsachse 11 weg vom zweiten Lichtbogenkontakt 2b, werden zunächst die Nennstromkontakte 2c, 2d getrennt, wodurch der Strom vollständig in einen die Lichtbogenkontakte 2a, 2b enthaltenden Stromkreis kommutiert. Bei der weiteren Bewegung des oberen Elements 20 werden nun auch die Lichtbogenkontakte 2a, 2b getrennt und es entsteht der Lichtbogen 15. Bei der weiteren Bewegung des oberen Elements 20 wird der Lichtbogen 15 verlängert. Beim Trennen der Lichtbogenkontakte 2a, 2b wird, wie oben beschrieben, das Oberelement 20 in Richtung des feststehenden Unterelements 21 verschoben. Dadurch steigt der Gasdruck im Kompressionsvolumen 4. Sobald er höher als im Heizvolumen 19 ist, strömt Gas aus dem Kompressionsvolumen 4 durch das Rückschlagventil 14 ins Heizvolumen 19, wodurch sich der Gasdruck im Heizvolumen erhöht.When disconnecting the circuit, i. upon movement of the
Auch bei schwachen Lichtbögen 15, z. B. bei Unterbrechung von Betriebsströmen, nimmt das Gasvolumen zu, sobald das Gas in der Lichtbogenzone 3 durch einen bei betriebsgemässer Trennung der Lichtbogenkontakte 2a, 2b entstehenden Lichtbogen 15 im wesentlichen aufgeheizt ist. Der Gasdruck in der Lichtbogenzone 3 bleibt jedoch bei schwachen Lichtbogen 15, also bei schwachen zu unterbrechenden Strömen, kleiner als der Gasdruck im Heizvolumen 19. Daher strömt das Gas in diesem Fall immer aus dem Kompressionsvolumen 4 ins Heizvolumen 19 und durch den Heizkanal 17 in die Lichtbogenzone 3, wo es den Lichtbogen 15 im Stromnulldurchgang bebläst.Even with
Bei starken Lichtbögen 15, welche beispielsweise aufgrund eines Kurzschlusses entstehen können, heizt sich aufgrund der hohen Stromstärke des Lichtbogens 15 das Gas in der Lichtbogenzone 3 schnell auf, wodurch auch ein starker Druckanstieg im Heizvolumen 19 auftritt. Beim Nulldurchgang des Stroms fällt der Druck in der Lichtbogenzone schnell ab, wodurch ein Druckgradient zwischen Lichtbogenzone 3 und Heizvolumen 19 entsteht. Als Folge strömt Gas aus dem Heizvolumen 19 durch den Heizkanal 17 zurück in die Lichtbogenzone 3, wodurch der Lichtbogen 15 intensiv beblasen und gelöscht wird. Aufgrund des starken Druckanstiegs im Heizvolumen 19, welcher den Gasdruck im Kompressionsvolumen 4 übersteigt, schliesst das Rückschlagventil 14 und es strömt kein weiteres Gas aus dem Kompressionsvolumen 4 ins Heizvolumen 19. Der Druck im Kompressionsvolumen 4 steigt während der Abwärtsbewegung des oberen Elements 20 weiter, bis der Druck des verdichteten Isoliergases im Kompressionsraum 4 den Wert des Gasdrucks im Niederdruckraum 5 um mindestens zwei bar übertrifft. Oberhalb dieses Überdrucks gibt die Blattfeder 7 das Loch 71 frei und begrenzt dann einen durch das Loch 71 geführten Strömungskanal für aus dem Kompressionsvolumen 4 austretendes Isoliergas. Bei der Freigabe des Lochs 71 wird die einseitig eingespannte Blattfeder 7 elastisch nach unten ins Niederdruckvolumen 5 ausgelenkt und bildet so den Strömungskanal für die vom Kompressionsvolumen 4 ins Niederdruckvolumen gerichtete Strömung 13. Ein unzulässig hoher Überdruck im Kompressionsraum 4 wird so vermieden. Zugleich wird so auch die vom Antrieb A aufzubringende Kompressionsarbeit begrenzt. Dies stellt den in der rechten Hälfte der
Beim Schliessen der Lichtbogenkontakte 2a, 2b wird das Oberelement 20 in Richtung des Lichtbogenkontakts 2b bewegt. Dadurch entsteht im Kompressionsvolumen 4 ein Unterdruck gegenüber dem Niederdruckvolumen 5. Dies hat zur Folge, dass die Ventilplatte 9 vom Ventilsitz 32 abhebt und die Strömung 12 nun frisches Isoliergas aus den Niederdruckvolumen 5 ins Kompressionsvolumen 4 führen kann. Hierbei wird der in der linken Hälfte der
- 11
- Hochspannungs-LeistungsschalterHigh-voltage circuit breakers
- 2a, 2b2a, 2b
- LichtbogenkontakteArcing contacts
- 2c, 2d2c, 2d
- NennstromkontakteRated current contacts
- 33
- LichtbogenzoneArc zone
- 44
- Kompressionsvolumencompression volume
- 55
- NiederdruckvolumenLow pressure volume
- 66
- VentilValve
- 7, 7a-7d7, 7a-7d
- Blattfedernleaf springs
- 88th
- Anschlagattack
- 99
- Ventilplatte, RingscheibeValve plate, annular disc
- 1010
- Trägerplattesupport plate
- 1111
- Längsachse des SchaltersLongitudinal axis of the switch
- 12, 1312, 13
- Strömungencurrents
- 1414
- Rückschlagventilcheck valve
- 1515
- LichtbogenElectric arc
- 16a16a
- Hilfsdüseauxiliary nozzle
- 16b16b
- HauptdüseMain Jet
- 1717
- Heizkanal in der LichtbogenzoneHeating channel in the arc zone
- 18a18a
- äusserer Randouter edge
- 18b18b
- innerer Randinner edge
- 1919
- Heizvolumenheating volume
- 2020
- Oberelementupper element
- 2121
- Unterelementsubelement
- 2222
- DurchmesserlinieDiameter line
- 3030
- Ventilkörpervalve body
- 3131
- GasdurchlassGas passage
- 3232
- Ventilsitzvalve seat
- 7171
- Lochhole
- 72, 73, 7472, 73, 74
- Schnitteslice
- 7575
- Innenrandinner edge
- 7676
- Aussenrandoutside of
- AA
- Antriebdrive
Claims (12)
- Gas-insulated high-voltage power circuit breaker (1), comprising
a compression device, operated by a drive (A) of the circuit breaker (1), with a compression volume (4) which is filled with insulating gas and in which the insulating gas is compressed, forming quenching gas, when the circuit breaker opens,
a low-pressure volume (5) which is filled with insulating gas, and
a valve (6) which interconnects the compression volume and the low-pressure volume, through which valve insulating gas flows from the low-pressure volume (5) into the compression volume (4) when the circuit breaker closes and through which insulating gas flows from the compression volume (4) in the reverse direction into the low-pressure volume (5) when the circuit breaker opens above a threshold value of the quenching gas pressure,
in which the valve (6) has the following elements:a valve body (30), which is guided through the wall of the compression chamber (4), with a gas passage (31) which connects the compression volume and the low-pressure volume and a valve seat (32) which encompasses the gas passage (31),a valve plate (9) which is operated by the insulating gas, is movably mounted in the valve body (30), and sits on the valve seat (32) when the circuit breaker opens, and also a stop (8) which is integrated into the valve body (30) and limits the movement of the valve plate (9) when the circuit breaker closes,wherein the valve plate (9) has at least one hole (71), characterized in that the valve plate has at least one leaf spring (7) which is fastened on one side, is elastically bendable in dependence upon the pressure of the insulating gas in the compression volume (4), closes off the hole (71) when the circuit breaker closes, opens the hole (71) when the circuit breaker opens, and limits a flow passage, which is guided through the hole (71), for the insulating gas (13) which discharges from the compression volume (4) as soon as the pressure of the compressed insulating gas in the compression volume (4) exceeds the value of the gas pressure in the low-pressure chamber (5) by at least two bar. - Circuit breaker according to Claim 1, characterized in that the leaf spring (7) is formed into the valve plate (9) by means of at least one incision (72, 73, 74).
- Circuit breaker according to Claim 2, characterized in that the at least one incision (72, 73, 74) is directed perpendicularly to the surface of the valve plate (9).
- Circuit breaker according to Claim 3, characterized in that at least one section of the at least one incision (72, 73, 74) is directed in an inclined manner in relation to the surface of the valve plate (9).
- Circuit breaker according to Claim 4, characterized in that the inclination angle is 60° at most.
- Circuit breaker according to one of Claims 1 to 5, characterized in that the valve plate (9) is produced from a spring steel sheet, the thickness of which in relation to the length of the leaf spring (7) is selected so that with bending of the leaf spring (7) a plastic deformation is avoided and the hole (71) is opened when the threshold value is exceeded.
- Circuit breaker according to one of Claims 1 to 6, characterized in that the valve plate (9) is designed as an annular disk, and in that the at least one leaf spring (7) is constructed as a circle section with regard to a middle point of the annular disk and has at least three sides which are cut into the annular disk, of which at least one (72) is radially oriented and at least two (73, 74) are directed concentrically.
- Circuit breaker according to Claim 7, characterized in that the annular disk has a multiplicity of leaf springs (7) which are formed in each case as a circle section with regard to the middle point of the annular disk and have in each case at least three sides which are cut into the annular disk, of which at least one (72) is radially oriented and at least two (73, 74) are directed concentrically, wherein each two of the leaf springs (7) are arranged in a mirror-image manner in relation to each other with regard to a diameter line (22) of the annular disk.
- Circuit breaker according to one of Claims 1 to 8, with a heating volume (19), connected to the compression chamber (4) via a check valve (14), for receiving arc gases, characterized in that the valve plate (9) and the at least one leaf spring (7) are formed from a standard spring steel.
- Circuit breaker according to Claim 9, characterized in that the standard spring steel is an unalloyed or low-alloy high-grade steel.
- Circuit breaker according to Claim 10, characterized in that the high-grade steel is a material which is commercially available under the short name of C60S, C75S or 51CrV4.
- Circuit breaker according to one of Claims 1 to 11, characterized in that the elastic bending of the leaf spring (7) is limited solely by means of the restoring force of the leaf spring (7) without the use of a stop.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2011/054068 WO2012123032A1 (en) | 2011-03-17 | 2011-03-17 | Gas-insulated high-voltage circuit breaker |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2686859A1 EP2686859A1 (en) | 2014-01-22 |
EP2686859B1 true EP2686859B1 (en) | 2014-11-26 |
Family
ID=44625409
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11708497.0A Active EP2686859B1 (en) | 2011-03-17 | 2011-03-17 | Gas-insulated high-voltage circuit breaker |
Country Status (7)
Country | Link |
---|---|
US (1) | US8822868B2 (en) |
EP (1) | EP2686859B1 (en) |
KR (1) | KR20140023318A (en) |
CN (1) | CN103443894B (en) |
BR (1) | BR112013023368A2 (en) |
MX (1) | MX2013010202A (en) |
WO (1) | WO2012123032A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202016107299U1 (en) * | 2016-12-22 | 2018-03-27 | Reinz-Dichtungs-Gmbh | Tempering device with spring element |
DE102017207422A1 (en) * | 2017-05-03 | 2018-11-08 | Siemens Aktiengesellschaft | disconnectors |
EP3407370B1 (en) * | 2017-05-24 | 2020-04-01 | General Electric Technology GmbH | A gas blast switch comprising an optimized gas storage chamber |
EP3419039B1 (en) * | 2017-06-20 | 2020-08-26 | General Electric Technology GmbH | Electric high-voltage circuit breaker |
DE102019212109A1 (en) | 2019-08-13 | 2021-02-18 | Siemens Aktiengesellschaft | Electrical switchgear |
DE102019213344A1 (en) | 2019-09-03 | 2021-03-04 | Siemens Energy Global GmbH & Co. KG | Subdivide a heating volume of a circuit breaker |
KR102466213B1 (en) * | 2020-12-31 | 2022-11-11 | 현대일렉트릭앤에너지시스템(주) | Gas insulated circuit breaker |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2316009B2 (en) | 1973-03-30 | 1977-11-10 | Zusatz in: 24 55 674 Siemews A.G, tOOQ Betlm \md 8000 München | GAS FLOW SWITCH |
DE3720816A1 (en) * | 1987-06-24 | 1989-01-05 | Licentia Gmbh | SWITCH WITH SELF-GENERATED EXHAUST GAS FLOW |
DE4107673A1 (en) | 1991-03-09 | 1992-09-10 | Sachsenwerk Ag | Encapsulated multiphase switchgear filled with insulating gas - has earthed isolating walls between conductors and operating gear of individual phases for subdivision into separate chambers |
DE4211159A1 (en) * | 1992-03-31 | 1993-10-07 | Siemens Ag | Electrical high-voltage circuit breaker |
EP0689218B1 (en) * | 1994-06-20 | 1997-11-19 | GEC Alsthom T&D AG | Gas blast switch |
DE59510175D1 (en) * | 1995-12-21 | 2002-05-23 | Alstom Ag Oberentfelden | Compressed gas switch with a switch-off brake arrangement |
DE29706202U1 (en) * | 1997-03-27 | 1997-06-05 | Siemens AG, 80333 München | Pressurized gas circuit breaker |
DE19736708C1 (en) * | 1997-08-18 | 1999-05-20 | Siemens Ag | Electrical high voltage switch |
DE19902835C2 (en) * | 1999-01-20 | 2001-12-06 | Siemens Ag | High-voltage circuit breaker with an insulating nozzle |
DE19939940A1 (en) * | 1999-08-23 | 2001-03-01 | Abb Research Ltd | Gas pressure switch |
EP1939910A1 (en) | 2006-12-27 | 2008-07-02 | ABB Technology AG | Gas blast circuit breaker with a radial flow opening |
FR2937179A1 (en) * | 2008-10-09 | 2010-04-16 | Areva T & D Sa | BREAKER CHAMBER FOR HIGH VOLTAGE CIRCUIT BREAKER WITH IMPROVED ARC BLOW |
FR2947377B1 (en) | 2009-06-29 | 2011-07-22 | Areva T & D Sa | DISCHARGE VALVE VALVE FOR DISCHARGING A DIELECTRIC GAS BETWEEN TWO VOLUMES OF A HIGH OR MEDIUM VOLTAGE BREAKER BREAK CHAMBER |
EP2299464B1 (en) * | 2009-09-17 | 2016-08-31 | ABB Schweiz AG | Self-blow switch with filling and excess pressure valve |
EP2343721A1 (en) * | 2010-01-06 | 2011-07-13 | ABB Research Ltd. | Gas-isolated high voltage switch |
DE102010020979A1 (en) * | 2010-05-12 | 2011-11-17 | Siemens Aktiengesellschaft | Compressed gas circuit breakers |
-
2011
- 2011-03-17 WO PCT/EP2011/054068 patent/WO2012123032A1/en active Application Filing
- 2011-03-17 CN CN201180069356.5A patent/CN103443894B/en active Active
- 2011-03-17 KR KR1020137027331A patent/KR20140023318A/en not_active Application Discontinuation
- 2011-03-17 EP EP11708497.0A patent/EP2686859B1/en active Active
- 2011-03-17 BR BR112013023368A patent/BR112013023368A2/en not_active IP Right Cessation
- 2011-03-17 MX MX2013010202A patent/MX2013010202A/en active IP Right Grant
-
2013
- 2013-09-17 US US14/029,274 patent/US8822868B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP2686859A1 (en) | 2014-01-22 |
CN103443894B (en) | 2016-08-17 |
MX2013010202A (en) | 2013-09-26 |
WO2012123032A1 (en) | 2012-09-20 |
BR112013023368A2 (en) | 2016-12-13 |
KR20140023318A (en) | 2014-02-26 |
US8822868B2 (en) | 2014-09-02 |
CN103443894A (en) | 2013-12-11 |
US20140014623A1 (en) | 2014-01-16 |
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