CN101346779A - Cooling of high voltage devices - Google Patents
Cooling of high voltage devices Download PDFInfo
- Publication number
- CN101346779A CN101346779A CNA2006800492828A CN200680049282A CN101346779A CN 101346779 A CN101346779 A CN 101346779A CN A2006800492828 A CNA2006800492828 A CN A2006800492828A CN 200680049282 A CN200680049282 A CN 200680049282A CN 101346779 A CN101346779 A CN 101346779A
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- Prior art keywords
- bushing
- cooling
- fluid
- electric conductor
- high voltage
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/54—Insulators or insulating bodies characterised by their form having heating or cooling devices
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- Rectifiers (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
The present invention relates to the field of electrical power distribution systems and cooling of high voltage devices in such power distribution systems. In particular, the invention relates to cooling of bushings utilized within such systems. The invention is also related to a corresponding method.
Description
Technical field
The field that the present invention relates to is the cooling of the high-tension apparatus in electric power distribution system and this electric power distribution system.Specifically, the present invention relates to the cooling of the sleeve pipe of use in this system.The invention still further relates to corresponding method.
Background technology
High-tension apparatus in the electric power distribution system of electric equipment and device-particularly gives out a lot of heats, thereby needs fully cooling.For example, traditional HVDC (high voltage direct current) converter valve can be air insulation and water-cooling type.Cooling system generally is set, and this cooling system comprises and for example is configured as the cooling water distribution pipeline that satisfies particular requirement.Another example of external refrigeration system is to use fan.
Yet, also have some electric equipments not cool off in the electric power distribution system by any external refrigeration system.So those equipment that lack the external refrigeration system only depend on self cooling, the i.e. air cooling of free convection.An example of this self cooling device is a bushing, for example converter transformer bushings.
General electric pressure in the electric power distribution system can reach about 500 Kilovolt Direct Currents.Yet electric pressure can continue to raise, and can totally reach 800 Kilovolt Direct Currents, and may reach higher electric pressure in the future.Simultaneously, current class can reach 4000-5000 peace or higher.This high voltage and high current class will inevitably cause the more heat discharging, and can become high for the requirement of electrosurgical trocar insulation.The size restrictions of electrical insulator the cooling effectiveness of sleeve pipe, this be because since size increase, heat must be directed one section longer distance to around refrigerating gas.So the efficient of self cooling off when the voltage and current grade is very high becomes very low.
When electric pressure increased, it was feasible adopting bigger conductor, thereby had reduced the heat that gives out, but this will cause equipment size to increase again.That is to say that the size of insulator also can be very big.
U.S. Patent bulletin US 2,953,629 is devoted to prevent flashover takes place in the condenser-type terminal, but the document has also been described by forcing the trial of cooling body cooling collar.The principle of this cooling body is the fluid seal such as water in the vestibule of central conductor.When the condenser-type terminal heating, this liquid is boiled, and steam rises and condensation, and condensate liquid returns the conductor bottom again.So heat is transferred to the atmosphere from inside pipe casing by heat-exchange tube.
There are a lot of defectives in the cooling device of above-mentioned prior art.For example, the boiling point of fluid has determined chilling temperature, this means, when fluid is water, chilling temperature will be limited to 100 ℃.Though it is feasible changing chilling temperature by change pressure, this need dispose pressure vessel, and the result will cause cooling body heavy and expensive.Specifically, this solution will be referred to a lot of devices, and these devices need high initial cost and maintenance cost.Another shortcoming is, because evaporation of water has on the equipment and produces sedimentary risk.
Based on above-mentioned consideration, hope can improve the cooling of the cooling of high-tension apparatus, particularly bushing.Further, it would also be desirable to provide the method for this sleeve pipe of a kind of corresponding cooling.
Summary of the invention
An object of the present invention is to improve the cooling of the bushing in the electric power distribution system.In particular, the objective of the invention is, thereby overcome or alleviate at least the defective of above-mentioned prior art for sleeve pipe provides the external refrigeration device.
Another object of the present invention is to improve the cooling of sleeve pipe, and described cooling also is sufficient for very high voltage and current.Specifically, the purpose of this invention is to provide the external refrigeration device that to tackle high voltage and high electric current.
Another purpose of the present invention provides a kind of cooling device that is used for cooling collar, and the dissipation power of this cooling device in sleeve pipe can not increase the size of building block when increasing with the increase of electric current and electric pressure.
These purposes realize by the bushing and the method for asking for protection in the independent claims.
According to the present invention, a kind of bushing is provided, this bushing can cool off by the external refrigeration system.This sleeve pipe for example is applicable to from fluid-cooled HVDC converter valve transmission high voltage and high electric current.This bushing comprises the insulator around electric conductor, and wherein, electric conductor can be electrically connected to high-tension apparatus, for example can be connected to the connector of HVDC converter valve.According to the present invention, the electric conductor of bushing can be connected to the external refrigeration system, for example is connected to the cooling system of HVDC converter valve.By the present invention, the design of sleeve pipe is simplified greatly, because the temperature of the conductor of sleeve pipe and insulating material is under control.Specifically, although used higher electric current and voltage, the size of sleeve pipe needn't increase.Further, even, also can realize the abundant cooling of sleeve pipe for high electric current and voltage levels-for example 500 to 800 Kilovolt Direct Currents and higher electric pressure.
According to one embodiment of present invention, the external refrigeration system is the cooling system of HVDC converter valve.This provides a kind of inventive approach of coming cooling collar by the cooling fluid that utilizes the HVDC converter valve that has now and be used, thereby realizes cost efficient and cooling reliably.
According to another embodiment of the invention, the electric conductor of bushing comprises the cooling pipe with one or more fluid passages.These fluid passages can be the autonomous channels, and these passages are at least one place fluid communication with each other and be arranged to pass described electric conductor receives high potential from the HVDC converter valve circulating cooling fluid.Therefore bushing can be connected to the fluid cooling system of external refrigeration system by one or more fluid passages.
Further, these one or more fluid passages preferably are set to one with the electric conductor of bushing.Thereby provide a kind of size and cost all worthwhile solution.
According to still another embodiment of the invention, electric conductor comprises the internal fluid pipe that wherein is provided with the autonomous channel.This internal fluid pipe is arranged in its inside along direction guiding cooling fluid, fluid by fluid hose the outside and the cooling pipe of electric conductor between the passage that generates be guided back.Thereby provide the simple mechanism that makes the cooling fluid circulation.
According to another embodiment of the invention, electric conductor is provided with the seal that can prevent fluid leaks in the top.Preferably, the sealing part is welded to the electric conductor end.This technical characterictic has strengthened fail safe by the device that stops cooling fluid to enter transformer or other sensitive equipment is set.Further, preferably be welded on its end owing to will cover, therefore provided a kind of permanent connection, this connection can be carried out pressure test and leak detection, has also further strengthened fail safe and has been convenient to fault location.
Further embodiment limits in the dependent claims.
The present invention also comprises this method, can obtain advantage corresponding to above-mentioned advantage according to this method.
By reading detailed description hereinafter, further aspect of the present invention, advantage and purpose will become apparent.
Description of drawings
Fig. 1 is the overall pattern of bushing.
Fig. 2 is the sectional view that is assembled to Fig. 1 middle sleeve on the transformer case.
Fig. 3 schematically shows embodiments of the invention.
Fig. 4 shows the interior conductor of sleeve pipe among Fig. 3.
Fig. 5 illustrates in greater detail conductor and novel cooling duct.
Fig. 6 shows and can advantageously implement valve hall of the present invention therein.
Embodiment
Under possible situation, represent same or analogous parts with identical Reference numeral in the specification full text.
Bushing is a kind of device that is used to pass fault to ground thing transmission high-potential current, and this fault to ground thing can be the shell of wall or the power equipment such as transformer tank for example.This sleeve pipe stops electric current to enter the fault to ground thing by its insulation property.
Traditional sleeve pipe wherein, has illustrated the general structure of sleeve pipe 1 as illustrated in fig. 1 and 2 among Fig. 1.In Fig. 2, show the sectional view that sleeve pipe 1 among Fig. 1 is installed to transformer case 18.High-pressure conductor 10 passes the center of the sleeve insulator 12 of hollow, and this sleeve insulator forms the shell around high-pressure conductor 10.Generally, for open-air application scenario, this insulator 12 is made by porcelain or silicon rubber.
In condenser-type terminal, be provided with the condenser core 14 that is used for voltage grading in the insulator shell.Voltage stress on sleeve pipe and the surrounding structure thereof comprises interchange (AC) and direct current (DC) component.The AC component voltage successively decreases and depends on the permittivity of insulating material.The DC component voltage successively decreases and depends on the resistivity that changes with temperature of insulating material.Thereby flange 16 is set to the shell 12 of joint sleeve makes it pass transformer case 18.Although there is shown condenser-type terminal, should be realized that the present invention can be applied in the non-capacitive sleeve pipe equally.
Also schematically show the connection of sleeve pipe 1 among Fig. 2 to the transformer intraware.This exemplary connection comprises the bottom contact 20 that the bottom part by high-pressure conductor 10 forms.This bottom contact 20 be arranged on the lower bottom end of sleeve pipe 1 and be configured to be arranged on transformer case 18 in the inner contact that is complementary 22 be connected.In addition, top external terminal 24 is arranged on an end place opposite with bottom contact 20 1 ends of sleeve pipe 1.External terminal 24 is electrically connected to high-pressure conductor 10 by being plane interface substantially, and the purpose that external terminal 24 is set is for transformer equipment is connected to external power source.
Except illustrated converter transformer bushings, other sleeve pipe also can adopt the present invention.In the case, it should be noted that and to adopt other suitable jockey that sleeve pipe and other electric equipment are coupled together.For example, if instruction of the present invention is used to construct wall bushings, its jockey should be applicable to this purpose so, rather than can be connected with transformer case 18.
Fig. 3 schematically shows embodiments of the invention, wherein shows new casing 30.Sleeve pipe 30 can be aforesaid sleeve pipe or any other bushing.High-pressure conductor 31 is contained in the sleeve pipe 30.According to the present invention, the high-pressure conductor 31 of sleeve pipe 30 is provided with one or more passages 32 that are used for the conducting cooling fluid, and this cooling fluid is cooling water in this example, and this passage is described in more detail with reference to Figure 4 and 5.
Next the cooling system with the HVDC converter valve illustrates the present invention.Under the regular situation, the HVDC converter valve is cooled off by the deionized water that circulates in closed-loop system.Heat is transferred to secondary circuit, and this secondary circuit can cool off in outdoor cooler.The present invention can combine enforcement with the HVDC converter valve of utilizing deionized water as coolant.The cooling device of cooling HVDC converter valve also can be used for cooling collar.
In Fig. 3, the HVDC converter valve is schematically shown and is represented by Reference numeral 34.The water pipe of the cooling system of HVDC converter valve 34 is by Reference numeral 39 expressions.Arrow I and II represent the direction of cooling water (or other fluid).Specifically, on the I direction, be directed to sleeve pipe 30 from the cooling water of HVDC converter valve 34, and on the II direction, the cooling water that is heated a little returns the HVDC converter valve cooling system.Well known in the art is that the cooling system of HVDC converter valve 34 can further comprise deionizater, pump, heat exchanger etc.These parts of cooling system schematically indicate with 40.
The cooling fluid of HVDC converter valve 34 can be identical or different with the current potential of the conductor 31 of sleeve pipe 30.According to the present invention, only some water that is used to cool off HVDC converter valve 34 is used to cooling collar 30.For example, the ratio of this part water is in 1/5000 to 1/500 scope, although may the more or less water of needs according to concrete application scenario.
In another embodiment of the present invention, the external refrigeration device is a cooling system independently, promptly is not the cooling system of HVDC.Yet, can adopt and the similar cooling system of the cooling system of HVDC converter valve.That is to say that coolant can circulate in closed-loop system, but this system is the autonomous system that is used for cooling collar.
Fig. 4 shows the conductor 31 that is positioned at sleeve pipe 30 among Fig. 3.Reference numeral 35 expression grounding shell, for example transformer tank or walls.Reference numeral 36 expression is used for sleeve pipe 30 is connected to jockey such as the electric equipment of the sealing of transformer intraware etc.The connecting portion that Reference numeral 37 expressions link to each other with for example high-voltage fence.Therefore sleeve pipe 30 can be used for the electric equipment of sealing is connected to high-voltage fence, although it also can be used in other application scenario.Show the novel fluid cooling device at 32 places, the double-head arrow at sleeve pipe 30 tops is represented the cooling fluid that flows.
Fig. 5 illustrates in greater detail conductor 31 and this novel cooling pipe of bushing 30.One or more cooling pipes 32 are wholely set with conductor 31.Water pipe 38 preferably is arranged in the cooling pipe 32.So cooling water can be guided by water pipe 38, thereby permission water enters in the water pipe 38 and is derived outside the water pipe 38.That is to say that water pipe 38 is set in water pipe 38 along a direction guiding cooling water, this water is conducted through passage 32a, the 32b that generates between the inside of the outside of water pipe 38 and cooling pipe 32 then.
The hollow inside that holds the conductor 31 of cooling pipe 32 is not through hole preferably, thereby has reduced the risk that water enters the electric equipment such as transformer.This one or more cooling- water duct 32a, 32b are connected to the cooling system that is used to cool off the HVDC converter valve.
According to one embodiment of present invention, the temperature of conductor 31 approximately remains in the scope between 40 ℃ to 80 ℃, preferably about 60 ℃.Should be realized that this temperature can be monitored and can be remained under other temperature.
It should be noted that in design and implement should be careful in the process of the present invention, enter in transformer or other sensitive equipment to prevent cooling water.In one embodiment of the invention, high-pressure conductor 31 is provided with the lid that is welded on its end.Welding provides a kind of permanent connection, can carry out for example pressure test and can carry out leak detection this connection.
Be appreciated that and adopt other seal that can prevent seepage, and other is used for the device of fastening this seal.Fig. 6 shows the HVDC valve hall, and schematically shows how easily to implement the present invention in this application scenario.The HVDC converter transformer is connected to the HVDC converter valve by converter transformer bushings.Generally, converter transformer directly is arranged in HVDC valve hall outside, and its sleeve pipe stretches in the valve hall.The top of sleeve pipe is directly connected to the HVDC converter valve then.Arrow II represents electricly to be connected with cooling water.Arrow IV represents one of some HVDC converter valve in the valve hall.
As previously mentioned, the cooling fluid of external refrigeration system can be identical or different with the current potential of the conductor 31 of sleeve pipe 30.But the non-expectation electric current that need cause the potential difference of sleeve pipe and cooling fluid is handled.Cooling system can be provided with the electrode of for example deriving this non-expectation electric current.
The cooling water that this employing has now and has been used comes the inventive approach of cooling collar to make it possible to realize cost efficient and cooling reliably.By the present invention, the design of sleeve pipe will be simplified significantly, because the temperature of the conductor of sleeve pipe and insulating material is in the control.For 800 Kilovolt Direct Currents of high voltage-for example, the sleeve pipe of prior art will be had to become very huge so that transmission 4000 peace electric currents for example.This creative cooling to sleeve pipe can make conductor diameter less, thereby reduces the size of whole sleeve pipe.
Further, even high-intensity currrent and voltage levels, for example 500 to 800 kilovolts even the direct current of voltage levels more also can be realized the abundant cooling of sleeve pipe.
The present invention is applicable to for example converter transformer bushings, valve hall wall bushings and indoor smoothing reactor sleeve pipe.
In the detailed description formerly, describe the present invention with reference to the concrete exemplary embodiment of the present invention.Under the situation that does not deviate from the claim restricted portion, can make various remodeling of the present invention and modification.Therefore, specification and accompanying drawing are interpreted as illustrative rather than restrictive.Thereby although water is described to preferred cooling fluid, oil also is a kind of feasible substitute.
Claims (19)
1. a bushing (30), comprise insulator (12) around electric conductor (31), this electric conductor (31) can be electrically connected to high-tension apparatus (34), it is characterized in that, the described electric conductor (31) of described bushing (30) can be connected to the external fluid cooling system.
2. bushing as claimed in claim 1 (30), wherein, described electric conductor (31) comprises cooling pipe (32).
3. bushing as claimed in claim 2 (30), wherein, described cooling pipe (32) comprises at least two autonomous channel (32a, 32b), (32a is 32b) at least in place's fluid communication with each other and be arranged to pass described electric conductor (31) receives high potential from described external fluid cooling system circulating cooling fluid in described at least two autonomous channels.
4. as claim 2 or 3 described bushings (30), wherein, described cooling pipe (32) is arranged to one with the described electric conductor (31) of described bushing (30).
5. as each described bushing (30) among the claim 1-4, wherein, described external refrigeration system is the fluid cooling system (39,40) of high voltage direct current converter valve (34).
6. as each described bushing among the claim 1-5, wherein, described bushing (30) comprises the device that is used for from fluid-cooled high voltage direct current converter valve (34) transmission high voltage and high electric current.
7. as claim 5 or 6 described bushings, wherein, the part of the cooling fluid of described high voltage direct current converter valve cooling system (39,40) is used to cool off described bushing (30).
8. as claim 5,6 or 7 described bushings, wherein, described bushing (30) can pass through described one or more fluid passages, and (32a 32b) is connected to the described fluid cooling system (39,40) of described high voltage direct current converter valve (34).
9. as each described bushing (30) among the claim 2-8, wherein, the described cooling pipe (32) of described electric conductor (31) comprises the fluid hose (38) of being arranged to guide cooling fluid.
10. as each described bushing among the claim 1-9, wherein, described bushing (30) is arranged for and passes at least one ground plane (35) and give transformer with high voltage and high current delivery.
11. as each described bushing among the claim 1-10, wherein, described electric conductor (31) is provided with the seal that can prevent fluid leaks in the top.
12. bushing as claimed in claim 11, wherein, described seal is welded to described end.
13. as each described bushing among the claim 1-12, wherein, the temperature of described electric conductor (31) remains in 40 ℃ to 80 ℃ the scope.
14. as each described bushing among the claim 1-13, wherein, described fluid is a water.
15. the method for a cooling bushing (30), described bushing (30) comprises the insulator (12) around electric conductor (31), this electric conductor (31) can be electrically connected to high-tension apparatus (34), the method is characterized in that by the described electric conductor (31) with described bushing (30) to be connected to the step that the external fluid cooling system cools off described bushing (30).
16. method as claimed in claim 15, wherein, described electric conductor (31) comprises cooling pipe (32), this cooling pipe (32) has at least two autonomous channel (32a, 32b), (32a is 32b) at least one place fluid communication with each other in described at least two autonomous channels, described method is included in described passage, and (32a holds the step of the circulating cooling fluid that flows through described electric conductor (31) in 32b).
17. as claim 15 or 16 described methods, wherein, the temperature of described electric conductor (31) remains in 40 ℃ to 80 ℃ the scope.
18. as each described method among the claim 15-17, wherein, the part of the cooling fluid of described external refrigeration system is used to cool off described bushing (30).
19. as each described method among the claim 15-18, wherein, described fluid is a water.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US75465405P | 2005-12-30 | 2005-12-30 | |
| US60/754,654 | 2005-12-30 | ||
| SEPCT/SE2006/000977 | 2006-08-25 | ||
| PCT/SE2006/000977 WO2007078226A1 (en) | 2005-12-30 | 2006-08-25 | Cooling of high voltage devices |
| PCT/SE2006/001490 WO2007078238A1 (en) | 2005-12-30 | 2006-12-22 | Cooling of high voltage devices |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101346779A true CN101346779A (en) | 2009-01-14 |
| CN101346779B CN101346779B (en) | 2012-10-24 |
Family
ID=38228492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800492828A Expired - Fee Related CN101346779B (en) | 2005-12-30 | 2006-12-22 | Cooling of high voltage devices |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1966807A4 (en) |
| CN (1) | CN101346779B (en) |
| BR (1) | BRPI0620963A2 (en) |
| CA (1) | CA2644842A1 (en) |
| RU (1) | RU2399108C2 (en) |
| WO (1) | WO2007078226A1 (en) |
| ZA (1) | ZA200805208B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101645647B (en) * | 2009-08-24 | 2012-06-27 | 中国电力科学研究院 | DC converter valve cooling system based on passive technology |
| CN105119210A (en) * | 2015-08-26 | 2015-12-02 | 芜湖市凯鑫避雷器有限责任公司 | High-voltage wall bushing semiconductor refrigeration device |
| CN105207146A (en) * | 2015-08-26 | 2015-12-30 | 芜湖市凯鑫避雷器有限责任公司 | Cooling device of wall bushing |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7662161B2 (en) | 1999-09-13 | 2010-02-16 | Rex Medical, L.P | Vascular hole closure device |
| SE531237C2 (en) * | 2007-07-04 | 2009-01-27 | Abb Technology Ag | Cooling of high voltage devices |
| CN109839016B (en) | 2018-04-09 | 2024-04-19 | 国家电网公司 | Guide rod, sleeve and converter transformer system |
| RU203974U1 (en) * | 2020-07-28 | 2021-04-29 | Общество с ограниченной ответственностью "Синтез НПФ" | SEALED CASE OF A HIGH VOLTAGE DEVICE OPERATING IN A LIQUID DIELECTRIC MEDIUM |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1706810A (en) * | 1925-09-23 | 1929-03-26 | Gen Electric | Electric apparatus |
| US1983371A (en) * | 1934-06-23 | 1934-12-04 | Ohio Brass Co | Temperature control for oil filled bushings |
| US3486064A (en) * | 1968-03-20 | 1969-12-23 | Gen Electric | Hollow cathode,nonthermionic electron beam source with replaceable liner |
| US3564386A (en) * | 1968-12-27 | 1971-02-16 | Westinghouse Electric Corp | Power supply for converting high voltage alternating current into high voltage direct current |
| US4169965A (en) * | 1978-02-21 | 1979-10-02 | General Electric Company | Integrally cooled electrical feedthrough bushing |
| US4358631A (en) * | 1980-09-10 | 1982-11-09 | Mitsubishi Denki Kabushiki Kaisha | Heat dissipating electrical bushing |
| SE9702223L (en) * | 1997-06-11 | 1998-12-12 | Asea Brown Boveri | Device for monitoring at a high voltage converter station |
| CN2365742Y (en) * | 1998-11-19 | 2000-02-23 | 永济电机厂 | Water-through electric cable |
| CN1260571A (en) * | 2000-02-02 | 2000-07-19 | 赵春宴 | Internal water channelling water-cooled cable |
| CN2496115Y (en) * | 2001-06-16 | 2002-06-19 | 吴县市宝联机电修造有限公司 | DC water cooled cable |
| CN2586228Y (en) * | 2002-12-16 | 2003-11-12 | 宜兴市华宇电炉设备有限责任公司 | Improved water cooling cable |
-
2006
- 2006-08-25 WO PCT/SE2006/000977 patent/WO2007078226A1/en active Application Filing
- 2006-12-22 EP EP06835899A patent/EP1966807A4/en not_active Withdrawn
- 2006-12-22 RU RU2008131323/09A patent/RU2399108C2/en not_active IP Right Cessation
- 2006-12-22 CN CN2006800492828A patent/CN101346779B/en not_active Expired - Fee Related
- 2006-12-22 BR BRPI0620963-7A patent/BRPI0620963A2/en not_active Application Discontinuation
- 2006-12-22 CA CA002644842A patent/CA2644842A1/en not_active Abandoned
-
2008
- 2008-06-13 ZA ZA200805208A patent/ZA200805208B/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101645647B (en) * | 2009-08-24 | 2012-06-27 | 中国电力科学研究院 | DC converter valve cooling system based on passive technology |
| CN105119210A (en) * | 2015-08-26 | 2015-12-02 | 芜湖市凯鑫避雷器有限责任公司 | High-voltage wall bushing semiconductor refrigeration device |
| CN105207146A (en) * | 2015-08-26 | 2015-12-30 | 芜湖市凯鑫避雷器有限责任公司 | Cooling device of wall bushing |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA200805208B (en) | 2009-04-29 |
| WO2007078226A1 (en) | 2007-07-12 |
| CA2644842A1 (en) | 2007-07-12 |
| EP1966807A1 (en) | 2008-09-10 |
| BRPI0620963A2 (en) | 2011-11-29 |
| RU2399108C2 (en) | 2010-09-10 |
| RU2008131323A (en) | 2010-02-10 |
| EP1966807A4 (en) | 2013-01-23 |
| CN101346779B (en) | 2012-10-24 |
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Effective date of registration: 20180426 Address after: Baden, Switzerland Patentee after: ABB TECHNOLOGY LTD. Address before: Zurich Patentee before: ABB T & D Technology Ltd. |
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