CN101223612B - Expansion tank for a stepping switch - Google Patents
Expansion tank for a stepping switch Download PDFInfo
- Publication number
- CN101223612B CN101223612B CN2006800259490A CN200680025949A CN101223612B CN 101223612 B CN101223612 B CN 101223612B CN 2006800259490 A CN2006800259490 A CN 2006800259490A CN 200680025949 A CN200680025949 A CN 200680025949A CN 101223612 B CN101223612 B CN 101223612B
- Authority
- CN
- China
- Prior art keywords
- switch
- bellows
- expansion tank
- step switch
- volume
- 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.)
- Expired - Fee Related
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0044—Casings; Mountings; Disposition in transformer housing
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention relates to a stepping switch S which is filled by the insulating liquid and an installment for holding the insulating liquid as a result of the change in volume caused by heat. The invention uses a corrugated pipe/a compensator K to hold the change in volume of the switch insulating liquid. According to the invention, a compensation system forms a part which has a compact structure and is immediately arranged on the switch without an attached pipeline. According to the structure of the invention, an expansion tank can not only integrate to be a decompressor, but also save the spatial to install the supervisory equipment of the stepping switch.
Description
Technical field
The present invention relates to a kind of with iknsulating liquid step switch of filling and the device that is used to hold this iknsulating liquid change in volume that causes owing to being heated.
The present invention can realize the sealing of switch-box and therefore obviously reduce the switch oil deterioration.Adopt device of the present invention can also cancel the pipeline of air dryer, outside expansion tank and subordinate in addition.The present invention has also solved the problem that gas is collected in the pipeline from the enclosed switch to the expansion tank in addition.
Background technology
The step switch of the above-mentioned type is mainly used in the voltage that is adjusted under the load condition in high-power transformer.In running since the heating of transition resistance, transformer cause tangible temperature fluctuation around switch and the insulation of its casing and heat radiation and other influences of coolant.This causes the iknsulating liquid temperature marked change of step switch.In addition because the formation that the heating of switching arc and/or transition resistance causes the decomposes of iknsulating liquid and causes gas thus.This gas rises based on its less density and must discharge by adequate measures.
Adopt in the prior art expansion tank is installed on transformer, this expansion tank links to each other with switch by the pipeline that tilts.Not only be implemented in to be heated by this pipeline iknsulating liquid is flowed, and reach the purpose of output gas.
Known, adopt a common expansion tank for transformer and switch, but do not cause iknsulating liquid to mix simultaneously.Therefore the main at present two chamber expansion tanks that adopt.Such expansion tank for example is documented among the DE19527763C2.The shortcoming of this expansion tank is, pasta contacts with extraneous air, and this just needs to adopt so-called air dryer.Air also is dried there by the drier guiding in this air dryer.Be absorbability (moisture absorption) and the necessary regular update drier that utilizes drier in this case.Periodic necessary visual observation and periodic replacement drier, especially mean significant cost factor (service intervals of suggestion: 3 months) in the high area of air humidity.This in addition air dryer can not provide the positiver sealing that prevents to absorb humidity and oxygen by iknsulating liquid, especially when transformer cools off fast.
Disclose a kind of sealed transformer in DE10010737A1, this transformer is provided with expandable radiator for volume compensation.Adopt the considerable cost cost of this radiator needs that are used to compensate volumetric expansion and also having problems aspect the gas discharging from switch-box.More known expansion tanks for the iknsulating liquid expansion aspect of transformer, it adopts film with iknsulating liquid and ambient air in main chamber.In DE3206368, put down in writing a kind of such expansion tank.Although these expansion tanks provide iknsulating liquid and the reliably isolated sealing of surrounding air, still need air dryer, the shortcoming that this has set forth above involving again.Cause described film aging and therefore cause technical insecurity with contacting of surrounding air in addition.
Put down in writing a kind of laying structure that is passed into the pipeline in the step switch in DE10224074A1, this pipeline adopts the labyrinth system to flow to expansion tank to avoid gas.But this system had not both reached this switch of sealing, can not prevent fully that gas from entering in this pipeline.It is essential that the pipeline configuration that leads to this costliness of oily expansion tank is still.
In addition by the known a kind of expansion tank that is directly installed on the step switch head of DE3504916C2.This scheme needs air dryer equally, and this causes this paper to start described known disadvantage.Therefore also can not reach sealing.
Put down in writing by the known a kind of cover cap that is used for pressure-reducing valve of WO98/54498 and at DE10312177 cover cap has been integrated into combination in the pressure-reducing valve.These two schemes all exist great operational issue and the big space of needs.
Summary of the invention
Below described invention can be implemented in the variation of switch when work compensation iknsulating liquid volume when avoiding above-mentioned shortcoming.
The change in volume that the iknsulating liquid that the present invention adopts bellows/compensator to hold switch causes owing to being heated.According to the present invention, this compensation arrangement constitutes the parts of compact conformation and is directly installed on the switch not having under the situation of additional pipeline.The shape of expansion tank is farthest suitable with the profile of step switch head, thereby keeps less space requirement amount.Therefore expansion tank and switch constitute a unit and expand dress when transportations.Saved and when setting up transformer, assembled expansion tank and pipeline bothersomely.
In bellows and/or compensator, only utilize volume differences between extended configuration and the compressive state for the volume compensation process.Can not utilize the basic volume under compressive state.According to the present invention, this volume that can not utilize is restricted to minimum degree by bowl-type or the basin shape insertion of installing.In a kind of special execution mode of the present invention, this bowl is configured to, forms a cavity, be used to hold or install necessary protective device and monitoring technique device.
In a special design of the present invention, this bowl is configured to, it is as the cover cap and the protecting cover of protection, monitoring and adjusting device.In another execution mode of the present invention, bowl is structured as the cover cap and the protection from splash device of pressure-reducing valve.This bowl is responsible for tackling and discharging the oil stream of heat when breaking down.
Make the compensation body become the part of switch by this according to device of the present invention.Cancelled additional external module and whole transformer is simplified.Got rid of problem that gas accumulates and hindered the problem of oil flow when the iknsulating liquid variations in temperature in pipeline by the assembly of cancellation initiation problem.
It is thoroughly isolated that structure by volume compensation device of the present invention can reach the iknsulating liquid and the atmosphere/surrounding air that make switch.Prevented that iknsulating liquid from absorbing humidity and oxygen.Avoided because the exhausted electric strength of humidity effect iknsulating liquid and obviously reduced the aging of iknsulating liquid.Can cancel the pipeline of outside expansion tank, air dryer and subordinate.Can omit the state of making regular check on the drier in the air dryer and because cancellation periodic replacement drier expensive and therefore saved expense.Avoid causing problems such as environmental pollution and garbage disposal owing to expending drier.
In a preferred implementation of the present invention, described switch is equipped with vent valve (V3).This vent valve can be designed worthily and is controlled to be, make it in hour response of air pressure, rather than rely on iknsulating liquid.This point is advantageously by realizing by means of buoy (SW) control vent valve.Can bleed constantly thus.Can adopt common large tracts of land pressure-reducing valve (D1) in order to prevent to nonserviceable to descend pressure wave to occur.Prevent that reliably switch-box from breaking when can be implemented in the gas of continuous discharge formation itself by the irrelevant decompressor of a kind of and liquid level and a kind of combination of relevant decompressor that has just responded when the minimal overpressure with liquid level.
Can reach the anti-fully fail safe of breaking by the bellows that adopts many walls in addition, this in addition design can realize leak supervision.Can protect the bellows of compensator to prevent lateral displacement (bending) by adopting guide pipe.The horizontal accelerative force that this guide pipe occurs when being used to equally be received in the transportation transformer.Be used for the guide pipe of the pressure wave conduction device of pressure-reducing valve as bellows.This pressure wave conduction device is configured to, and makes not only when compensator stretches but also compensator is all guaranteed conducting pressure ripple reliably when compressing.The movable primary element of compensator is a metal bellows, it based on its annular ring around waveform and have axial motion, this axial motion is used to compensate the change in volume that the iknsulating liquid of step switch causes owing to being heated in being applied to according to expansion tank of the present invention the time.This bellows obtains its motility by the flexible that is in waveform side radially.Pay the utmost attention to a lira shape (lyraf for described purposes based on kinetic characteristic big under the enough big intensity of pressure at this
Rmig) waveform.
In the special execution mode of another kind, described compensation body is provided with flexible member, so that reach predetermined pressure gap.These flexible members also can constitute by the main body of compensator itself.
In another special design, compensation arrangement is equipped with along a direction or also can be along the volume restrictions device of both direction.For example can in the switch casing, realize satisfying the pressure gap of specific (special) requirements thus.This restraint device equally can be by realizing the multi-piece type compensation arrangement of the travel limits of compensating element, or the chamber by having different elastic constants.
Embodiment
Elaborate the present invention by specific embodiment below.
Fig. 1 shows the switch S with switch head SK, and it is placed on the cover cap TD of transformer.The switch S volume inside is filled with iknsulating liquid.Because the shell of this switch S seals, therefore when the iknsulating liquid heating of switch, cause the internal pressure in the switch to raise.This pressure raises and impels compensator K to extend.Be directed to supervising device D1 by the gas rising of oily decomposes generation and by columniform pipe fitting R1.
Among two pipeline section R1 one is placed on the movable end plate of compensator.These pipe fittings are configured to, and make them all guarantee reliably pressure wave to be conducted to pressure-reducing valve D1 when compensator is in all places.Height dimension is designed to, and makes compensator make full use of its whole motility and guarantee that oil flows reliably between switch and expansion tank.Cross section at this pressure wave passage that is made of pipe fitting R1 designs greatly like this for pressure-reducing valve D1, that is, make it possible to unhinderedly to pressure-reducing valve conducting pressure ripple.The oily channels configuration that will constitute by the gap between two pipe fittings or the guide (R1+R2) in the present embodiment in expansion tank becomes, its volume that causes by being heated fluctuation for slow extension provides enough oil stream, but has so a kind of inhibitory action for the fulminant volume increase under the malfunction, promptly, make pressure wave can not be transmitted on the bellows, but conduct to pressure-reducing valve D1 in pipe fitting R1 inside.
Fig. 2 shows the step switch S of the present invention with expansion tank, and the protection relay D2 that wherein is usually used in step switch links to each other with the inner chamber of this switch S by pipeline R2.
Fig. 3 shows an embodiment of described switch expansion tank, wherein will be encased in this columniform expansion tank as the bellows K of negative compensator.The axial motion of bellows reaches the effect of adjusting volume.Removable external cover plate and described bellows K at this expansion tank P2 constitute a cavity, and this cavity is used to install the supervising device of switch.The temperature that the motion of cover plate P2 is used for going up in display unit (AV) iknsulating liquid that shows oil volume or its corresponding step switch.
Fig. 4 shows an embodiment of described switch expansion tank, wherein compensates the change in volume of the iknsulating liquid of this step switch as the bellows K of positive compensator.A fixing basin shape inner cylinder T is arranged in the expansion tank that is made of bellows, and this cylinder surrounds the supervising device of step switch.The inner cylinder T of this basin shape is preferred farthest suitable in the shape under the compressive state with bellows.This inner cylinder also cuts lid and protection from splash device as the oil fence of the pressure-reducing valve D1 that is surrounded by this cylinder simultaneously in the present embodiment.
Fig. 5 shows the transformer as electric component with seal casinghousing 4, is filled with iknsulating liquid 5 in this housing.Housing links to each other with expansion tank K1 with two float relay B1 by pipeline.The film that iknsulating liquid and gas partitions are opened is installed in this expansion tank K1.This air cavity is equiped with the chamber that other are used for second air cushion K2 by pipeline R7, and these chamber cloth are set as, and makes the temperature heat that realizes the iknsulating liquid 5 in the second air cushion K2 and the transformer take off coupling.
Claims (15)
1. step switch, it fills and is provided with can with iknsulating liquid, has the expansion tank that is used to accept the change in volume that iknsulating liquid causes owing to being heated, it is characterized in that, utilize the motion of bellows to accept the change in volume of iknsulating liquid, and the top that expansion tank is directly installed on this electric component, by the basin shape inner cylinder in the bellows that constitutes outer wall or by in basin shape exterior circular column, laying the oil volume that bellows compensates the expansion tank of available bellows body product moment, the shell of the inner cylinder of described expansion tank or bellows encirclement pressure-reducing valve or formation pressure-reducing valve.
2. step switch as claimed in claim 1 is characterized in that, the interior bowl of described expansion tank or inner corrugated pipe constitute a cavity, and needed supervising device of switch and annex are settled in conserve space ground in this cavity.
3. step switch as claimed in claim 1 or 2 is characterized in that described expansion tank is provided with flexible member, so that reach predetermined pressure gap.
4. step switch as claimed in claim 1 or 2 is characterized in that, the standing part of described expansion tank and motion parts are respectively equipped with pilot sleeve and these pilot sleeves are overlapped.
5. step switch as claimed in claim 1 or 2 is characterized in that, adopts multiply bellows.
6. step switch as claimed in claim 5 is characterized in that, connects the leak supervision device for two-layer at least bellows on the space between the layer.
7. step switch as claimed in claim 1 or 2 is characterized in that, described switch is provided with the device of the occupied state or the detected pressures that are used to detect iknsulating liquid.
8. step switch as claimed in claim 9 is characterized in that, this device is used to analyze the distortion and/or the display switch oil volume of the compensating element, that is caused by change in volume.
9. step switch as claimed in claim 1 or 2 is characterized in that, described switch (S) is equipped with and is used to collect and the device (V3) of the formed gas of discharging itself.
10. step switch as claimed in claim 9 is characterized in that, controls this device according to the oil level in the expansion tank.
11. step switch as claimed in claim 1 or 2 is characterized in that, limits the maximum swelling amount of described bellows by means of brake apparatus.
12. step switch as claimed in claim 1 or 2 is characterized in that, utilizes a gravity that increases the weight of body to produce the reset force that is used for described bellows.
13. step switch as claimed in claim 12 is characterized in that, needed supervising device of described switch and annex be configured for described bellows reset force increase the weight of body.
14. as claim 1 or 3 described step switch, it is characterized in that, cover described bellows with protecting cover.
15. step switch as claimed in claim 1 or 2 is characterized in that, adopts the electric device of using the dielectric filling of expanding when being heated.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005033925.5 | 2005-07-15 | ||
| DE200510033925 DE102005033925A1 (en) | 2005-07-15 | 2005-07-15 | Insulating-fluid-filled step switch for power transformer, uses movement of bellows to accommodate changes in volume of insulating fluid |
| DE102005034851.3 | 2005-07-17 | ||
| DE102005034851 | 2005-07-17 | ||
| PCT/EP2006/064292 WO2007009960A1 (en) | 2005-07-15 | 2006-07-14 | Expansion tank for a stepping switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101223612A CN101223612A (en) | 2008-07-16 |
| CN101223612B true CN101223612B (en) | 2011-11-30 |
Family
ID=37563577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800259490A Expired - Fee Related CN101223612B (en) | 2005-07-15 | 2006-07-14 | Expansion tank for a stepping switch |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101223612B (en) |
| DE (1) | DE102005033925A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011008689B3 (en) | 2011-01-15 | 2012-03-08 | Maschinenfabrik Reinhausen Gmbh | step switch |
| CN104025408A (en) * | 2011-10-11 | 2014-09-03 | 森春减压系统有限公司 | Depressurization system for an electrical transformer |
| CN104779036B (en) * | 2015-04-18 | 2018-03-27 | 孙艺夫 | Suitable for the outer oily vertical metal bellow oil conservator of transport and its transportation resources |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB425169A (en) * | 1933-09-08 | 1935-03-08 | John Lindley Thompson | Improvements in or relating to expansion chambers for hermetically sealed tanks or casings, applicable to the cooling tanks of electrical apparatus |
| CN2329079Y (en) * | 1998-06-19 | 1999-07-14 | 中国人民解放军87456部队 | Capacitive compensator |
| DE10312177B3 (en) * | 2003-03-19 | 2004-06-17 | Maschinenfabrik Reinhausen Gmbh | Pressure venting valve for oil-filled transformer or stepping switch with central opening in housing flange sealed by spring-loaded valve cover |
| CN2645194Y (en) * | 2003-07-28 | 2004-09-29 | 邵为 | External oil type expander |
-
2005
- 2005-07-15 DE DE200510033925 patent/DE102005033925A1/en not_active Withdrawn
-
2006
- 2006-07-14 CN CN2006800259490A patent/CN101223612B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB425169A (en) * | 1933-09-08 | 1935-03-08 | John Lindley Thompson | Improvements in or relating to expansion chambers for hermetically sealed tanks or casings, applicable to the cooling tanks of electrical apparatus |
| CN2329079Y (en) * | 1998-06-19 | 1999-07-14 | 中国人民解放军87456部队 | Capacitive compensator |
| DE10312177B3 (en) * | 2003-03-19 | 2004-06-17 | Maschinenfabrik Reinhausen Gmbh | Pressure venting valve for oil-filled transformer or stepping switch with central opening in housing flange sealed by spring-loaded valve cover |
| CN2645194Y (en) * | 2003-07-28 | 2004-09-29 | 邵为 | External oil type expander |
Non-Patent Citations (1)
| Title |
|---|
| JP昭61-128506A 1986.06.16 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102005033925A1 (en) | 2007-01-18 |
| CN101223612A (en) | 2008-07-16 |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20111130 Termination date: 20210714 |
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| CF01 | Termination of patent right due to non-payment of annual fee |