WO2013064410A1 - A method for dielectrically insulating active electric parts - Google Patents
A method for dielectrically insulating active electric parts Download PDFInfo
- Publication number
- WO2013064410A1 WO2013064410A1 PCT/EP2012/071095 EP2012071095W WO2013064410A1 WO 2013064410 A1 WO2013064410 A1 WO 2013064410A1 EP 2012071095 W EP2012071095 W EP 2012071095W WO 2013064410 A1 WO2013064410 A1 WO 2013064410A1
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- WIPO (PCT)
- Prior art keywords
- gas
- electrical
- insulating gas
- circuit breaker
- insulating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/56—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances gases
Definitions
- the invention concerns a method for dielectrically insulating active electric parts a dielectric insulation medium comprising CF 3 -C(0)-C(CF 3 ) 2 F
- Dielectric insulation media in liquid or gaseous state are applied for the insulation of electrical active parts in a wide variety of electrical apparatuses, e.g. in switchgears or transformers.
- the electrical active part in medium or high voltage metal encapsulated switchgears is arranged in gas tight housings comprising a dielectric insulating gas. This gas also serves to extinct any arcs.
- WO 2010/142346 discloses that fluoroketones with 4 to 12 carbon atoms are suitable components of dielectric insulating gases
- dodecafluoro-2-methylpentan-3-one is in the focus of that document. They are said to have a high dielectric strength and provide only little contribution to global warming potential.
- the object of the present invention is to provide an improved for electrical insulation of electrical active parts. This object and other objects are achieved by the current invention.
- the method of the present invention provides for the dielectric insulation of active electric parts wherein the electrical active part is arranged in a gas-tight housing comprising an insulating gas which contains or consists
- CF 3 -C(0)-C(CF 3 ) 2 F can be manufactured from CF 3 C(0)F and
- the electrical active parts are medium voltage or high voltage parts.
- the term "medium voltage” relates to a voltage in the range of 1 kV to 72 kV ; the term “high voltage” refers to a voltage of more than 72 kV. While these are preferred electrical active parts in the frame of the present invention, the parts may also e low voltage parts with a voltage below 1 kV being concerned.
- the electrical active parts of the invention can be “stand alone” parts, or they can be part of an assembly of parts, e.g. of an apparatus. This will now be explained in detail.
- the electrical active part can be a switch, for example, a fast acting earthing switch, a disconnector, a load-break switch or a puffer circuit breaker, in particular a medium- voltage circuit breaker (GIS-MV), a generator circuit breaker (GIS-HV), a high voltage circuit breaker, a bus bar a bushing, a gas- insulated cable, a gas-insulated transmission line, a cable joint, a current transformer, a voltage transformer or a surge arrester.
- GIS-MV medium- voltage circuit breaker
- GIS-HV generator circuit breaker
- a high voltage circuit breaker a bus bar a bushing, a gas- insulated cable, a gas-insulated transmission line, a cable joint, a current transformer, a voltage transformer or a surge arrester.
- the electrical active part may also be part of an electrical rotating machine, a generator, a motor, a drive, a semiconducting device, a computing machine, a power electronics device or high frequency parts, for example, antennas or ignition coils.
- the method of the invention is especially suited for medium voltage switchgears and high voltage switchgears.
- the insulating gas is preferably at a pressure of equal to or greater than 0.1 bar (abs.).
- the insulating gas is at preferably a pressure equal to or lowers than 30 bar (abs).
- a preferred pressure range is from 1 to 20 bar (abs.).
- the partial pressure of CF 3 -C(0)-C(CF 3 ) 2 F depends, i.a., upon its concentration in the isolating gas. If the dielectric isolating gas consists of CF 3 -C(0)-C(CF 3 ) 2 F, its partial pressure is equal to the total pressure and corresponds to the ranges given above. If the dielectric gas includes an inert gas, the partial pressure of CF 3 -C(0)-C(CF 3 ) 2 F is correspondingly lower. A partial pressure of CF 3 -C(0)-C(CF 3 ) 2 F which is equal to or lower than 10 bar (abs) is preferred.
- the insulating gas comprises
- inert gas denotes a gas which is non-reactive under the conditions in the electrical active parts.
- any other dielectric insulating gas may be applied as "inert gas" additionally to the content of CF 3 -C(0)-C(CF 3 ) 2 F.
- the composition of the dielectric insulating gas and especially that the content of CF 3 -C(0)-C(CF 3 ) 2 F in the inert gas is such that under the climate conditions or the temperature in the ambience of the electrical apparatus, under the pressure in the electrical part, essentially no condensation of the components in the dielectric insulating gas occurs.
- the term "essentially no condensation” denotes that at most 5 % by weight, preferably at most 2% by weight, of the dielectric insulating gas condenses.
- the amounts of CF 3 -C(0)-C(CF 3 ) 2 F, the kind and amount of inert gas are selected such that the partial pressure of CF 3 -C(0)-C(CF 3 ) 2 F is lower than the pressure where condensation of CF 3 -C(0)-C(CF 3 ) 2 F is observed at a reasonably low
- the insulating gas comprises
- the content of CF 3 -C(0)-C(CF 3 ) 2 F is preferably equal to or greater than 1 % by volume. In the insulating gas, the content
- CF 3 -C(0)-C(CF 3 ) 2 F is preferably equal to or lower than 30 % by volume.
- the balance to 100 % by volume is inert gas. Alternatively, the balance to 100 % by volume is air or synthetic air. Most preferably, the content of CF 3 -C(0)- C(CF 3 ) 2 F in the dielectric insulating gas is from 5 to 25 % by volume.
- the inert gas is selected from the group consisting of nitrogen and helium.
- Nitrogen as inert gas is especially preferred, and the insulating gas of the present invention consists essentially of CF 3 -C(0)-C(CF 3 ) 2 F and nitrogen.
- Another object of the present invention concerns the use
- CF 3 -C(0)-C(CF 3 ) 2 F is the low boiling point of about 25°C.
- Example 1 Manufacture of CF 3 -C(0)-C(CF 3 ) 2 F
- CF 3 -C(0)-C(CF 3 ) 2 F is manufactured by the reaction of CF 3 -C(0)-F with hexafluoropropylene in the presence of KHF2 in acetonitrile in an autoclave at 100°C for 4 hours and 125°C for 5 hours.
- Example 2 Manufacture of dielectric insulating gases
- a homogenous mixture consisting of CF 3 -C(0)-C(CF 3 ) 2 F and N 2 in a volume ratio 1 :4 is manufactured in an apparatus comprising a static mixer and a compressor.
- Example 3 Provision of an earth cable containing the dielectric insulating gas of example2
- the gas mixture of example 2 is directly fed into an earth cable for high voltage, until a total pressure of 10 bar (abs) in the cable is achieved.
- Example 4 A switchgear containing CF 3 -C(0)-C(CF 3 ) 2 F and N 2 in a volume ratio 1 :4
- a switchgear which contains a switch surrounded by a gas tight metal case.
- the gas mixture of example 2 is passed into the gas tight metal case via a valve until a pressure of 18 bar (abs) is achieved.
- Example 5 Provision of a gas-insulated transmission line containing the dielectric insulating gas of example 3
- the gas mixture of example 2 is directly fed into an earth cable for high voltage, until a total pressure of 10 bar (abs) in the cable is achieved.
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Gas-Insulated Switchgears (AREA)
- Organic Insulating Materials (AREA)
Abstract
CF3-C(O)-C(CF3)2F, preferably in admixture with inert gas, e.g. N2 or helium, is applied as dielectric insulating gas.
Description
A method for dielectrically insulating active electric parts
This application claims priority to European patent application No.
11187797.3, filed November 4, 2011, the whole content of this application being incorporated herein by reference for all purposes.
The invention concerns a method for dielectrically insulating active electric parts a dielectric insulation medium comprising CF3-C(0)-C(CF3)2F
(trifluoromethyl heptafluoroisopropyl ketone), and the use
of CF3-C(0)-C(CF3)2F as a component in a dielectric insulating medium.
Dielectric insulation media in liquid or gaseous state are applied for the insulation of electrical active parts in a wide variety of electrical apparatuses, e.g. in switchgears or transformers.
As described in WO 2010/142346, the electrical active part in medium or high voltage metal encapsulated switchgears is arranged in gas tight housings comprising a dielectric insulating gas. This gas also serves to extinct any arcs.
Mixtures of SF6 and N2 are widely applied as dielectric insulating gas. Efforts have been made in the past to provide alternative dielectric insulating gases.
WO 2010/142346 mentioned above discloses that fluoroketones with 4 to 12 carbon atoms are suitable components of dielectric insulating gases;
dodecafluoro-2-methylpentan-3-one is in the focus of that document. They are said to have a high dielectric strength and provide only little contribution to global warming potential.
The object of the present invention is to provide an improved for electrical insulation of electrical active parts. This object and other objects are achieved by the current invention.
The method of the present invention provides for the dielectric insulation of active electric parts wherein the electrical active part is arranged in a gas-tight housing comprising an insulating gas which contains or consists
of CF3-C(0)-C(CF3)2F.
CF3-C(0)-C(CF3)2F can be manufactured from CF3C(0)F and
hexafiuoropropylene as described in US 3,185,734 or from trifiuoroacetic acid anhydride and hexafiuoropropylene in the presence of KF as described in example 5 of WO 2001/005468.
The term "electrical active part" has to be understood very broadly.
Preferably, it covers any part which is used for the generation, the distribution or the usage of electrical energy provided it comprises a gas-tight housing wherein the dielectric insulating gas provides for the dielectric insulation of parts which bear voltage or current. Preferably, the electrical active parts are medium voltage or high voltage parts. The term "medium voltage" relates to a voltage in the range of 1 kV to 72 kV ; the term "high voltage" refers to a voltage of more than 72 kV. While these are preferred electrical active parts in the frame of the present invention, the parts may also e low voltage parts with a voltage below 1 kV being concerned.
In the frame of the present invention, the singular is intended to include the plural, and vice versa.
It has to be noted that the electrical active parts of the invention can be "stand alone" parts, or they can be part of an assembly of parts, e.g. of an apparatus. This will now be explained in detail.
The electrical active part can be a switch, for example, a fast acting earthing switch, a disconnector, a load-break switch or a puffer circuit breaker, in particular a medium- voltage circuit breaker (GIS-MV), a generator circuit breaker (GIS-HV), a high voltage circuit breaker, a bus bar a bushing, a gas- insulated cable, a gas-insulated transmission line, a cable joint, a current transformer, a voltage transformer or a surge arrester.
The electrical active part may also be part of an electrical rotating machine, a generator, a motor, a drive, a semiconducting device, a computing machine, a power electronics device or high frequency parts, for example, antennas or ignition coils.
The method of the invention is especially suited for medium voltage switchgears and high voltage switchgears.
In the electrical active part, the insulating gas is preferably at a pressure of equal to or greater than 0.1 bar (abs.). The insulating gas is at preferably a pressure equal to or lowers than 30 bar (abs). A preferred pressure range is from 1 to 20 bar (abs.).
The partial pressure of CF3-C(0)-C(CF3)2F depends, i.a., upon its concentration in the isolating gas. If the dielectric isolating gas consists of CF3-C(0)-C(CF3)2F, its partial pressure is equal to the total pressure and corresponds to the ranges given above. If the dielectric gas includes an inert gas, the partial pressure of CF3-C(0)-C(CF3)2F is correspondingly lower. A partial
pressure of CF3-C(0)-C(CF3)2F which is equal to or lower than 10 bar (abs) is preferred.
In a preferred embodiment, the insulating gas comprises
CF3-C(0)-C(CF3)2F and an inert gas. The term "inert gas" denotes a gas which is non-reactive under the conditions in the electrical active parts. For example, any other dielectric insulating gas may be applied as "inert gas" additionally to the content of CF3-C(0)-C(CF3)2F.
It is preferred that the composition of the dielectric insulating gas and especially that the content of CF3-C(0)-C(CF3)2F in the inert gas is such that under the climate conditions or the temperature in the ambience of the electrical apparatus, under the pressure in the electrical part, essentially no condensation of the components in the dielectric insulating gas occurs. The term "essentially no condensation" denotes that at most 5 % by weight, preferably at most 2% by weight, of the dielectric insulating gas condenses. For example, the amounts of CF3-C(0)-C(CF3)2F, the kind and amount of inert gas are selected such that the partial pressure of CF3-C(0)-C(CF3)2F is lower than the pressure where condensation of CF3-C(0)-C(CF3)2F is observed at a reasonably low
temperature.
In another preferred embodiment, the insulating gas comprises
CF3-C(0)-C(CF3)2F and air or synthetic air.
In the insulating gas, the content of CF3-C(0)-C(CF3)2F is preferably equal to or greater than 1 % by volume. In the insulating gas, the content
of CF3-C(0)-C(CF3)2F is preferably equal to or lower than 30 % by volume. The balance to 100 % by volume is inert gas. Alternatively, the balance to 100 % by volume is air or synthetic air. Most preferably, the content of CF3-C(0)- C(CF3)2F in the dielectric insulating gas is from 5 to 25 % by volume.
Preferably, the inert gas is selected from the group consisting of nitrogen and helium. Nitrogen as inert gas is especially preferred, and the insulating gas of the present invention consists essentially of CF3-C(0)-C(CF3)2F and nitrogen.
Another object of the present invention concerns the use
of CF3-C(0)-C(CF3)2F as dielectric insulating gas or as constituent of an dielectric insulating gas.
The advantage of CF3-C(0)-C(CF3)2F is the low boiling point of about 25°C.
Should the disclosure of any patents, patent applications, and publications which are incorporated herein by reference conflict with the description of the
present application to the extent that it may render a term unclear, the present description shall take precedence. The following examples further explain the invention without intention to limit it.
Example 1 : Manufacture of CF3-C(0)-C(CF3)2F
As described in US 3,185,734 in example II, CF3-C(0)-C(CF3)2F is manufactured by the reaction of CF3-C(0)-F with hexafluoropropylene in the presence of KHF2 in acetonitrile in an autoclave at 100°C for 4 hours and 125°C for 5 hours.
Example 2: Manufacture of dielectric insulating gases
As described in W098/23363, a homogenous mixture consisting of CF3-C(0)-C(CF3)2F and N2 in a volume ratio 1 :4 is manufactured in an apparatus comprising a static mixer and a compressor.
Example 3 : Provision of an earth cable containing the dielectric insulating gas of example2
The gas mixture of example 2 is directly fed into an earth cable for high voltage, until a total pressure of 10 bar (abs) in the cable is achieved.
Example 4: A switchgear containing CF3-C(0)-C(CF3)2F and N2 in a volume ratio 1 :4
A switchgear is used which contains a switch surrounded by a gas tight metal case. The gas mixture of example 2 is passed into the gas tight metal case via a valve until a pressure of 18 bar (abs) is achieved.
Example 5 : Provision of a gas-insulated transmission line containing the dielectric insulating gas of example 3
The gas mixture of example 2 is directly fed into an earth cable for high voltage, until a total pressure of 10 bar (abs) in the cable is achieved.
Claims
1. A method for dielectrically insulating an active electric part wherein the electrical active part is arranged in a gas-tight housing comprising an insulating gas which contains or consists of CF3-C(0)-C(CF3)2F.
2. The method of claim 1 wherein the insulating gas is at a pressure equal to or greater than 0.1 bar (abs.).
3. The method of claim 1 or 2 wherein the insulating gas is at a pressure equal to or lower than 30 bar (abs).
4. The method of any one of claims 1 to 3 wherein the insulating gas comprises CF3-C(0)-C(CF3)2F and an inert gas.
5. The method of any one of claims 1 to 4 wherein the inert gas is selected from the group consisting of nitrogen and helium.
6. The method of any of claims 1 to 3 wherein the insulating gas comprises CF3-C(0)-C(CF3)2F and air or synthetic air.
7. The method of any one of claims 1 to 6 wherein the content
of CF3-C(0)-C(CF3)2F in the insulating gas is from > 0 to 80 % by volume.
8. The method of claim 7 wherein the content of CF3-C(0)-C(CF3)2F in the insulating gas is from 5 to 25 % by volume.
9. The method of any one of claims 1 to 8 wherein the electrical active parts are electrical apparatuses or are parts of an electrical apparatus which is selected from the group consisting of medium and high voltage apparatus.
10. The method of claim 9 wherein the active electric part is selected from the group consisting of switches, a fast acting earthing switch, a disconnector, a load-break switch or a circuit breaker or puffer circuit breaker, in particular a medium- voltage circuit breaker, a generator circuit breaker, a high voltage circuit breaker, a bus bar a bushing, a cable, a gas-insulated cable, a gas-insulated transmission line, a cable joint, a current transformer, a voltage transformer or a surge arrester.
11. The method of any one of claims 1 to 10 wherein the electrical active part is part of electrical rotating machine, a generator, a motor, a drive, a semiconducting device, a computing machine or a power electronics device.
12. The method of any one of claims 1 to 11 wherein the electrical active part is part of an apparatus, e.g. a switchgear, especially an air-insulated or gas- insulated metal encapsulated switchgear, a transformer, for example, a distribution transformer, a super- voltage transformer for particle accelerator systems, a power transformer.
13. The method of claim 12 wherein the switchgear is a gas-insulated metal-encapsulated switchgear.
14. Use of CF3-C(0)-C(CF3)2F as dielectric insulating gas.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP11187797.3 | 2011-11-04 | ||
| EP11187797 | 2011-11-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2013064410A1 true WO2013064410A1 (en) | 2013-05-10 |
Family
ID=47071283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2012/071095 Ceased WO2013064410A1 (en) | 2011-11-04 | 2012-10-25 | A method for dielectrically insulating active electric parts |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2013064410A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016092115A1 (en) * | 2014-12-12 | 2016-06-16 | Abb Technology Ag | Apparatus for the generation, distribution and/or usage of electrical energy and component for such an apparatus |
| EP3079157A1 (en) * | 2015-04-09 | 2016-10-12 | Solvay SA | Methods for dielectrically insulating electrical active parts |
| EP3079156A1 (en) * | 2015-04-09 | 2016-10-12 | Solvay SA | Methods for dielectrically insulating electrical active parts |
| WO2017093504A1 (en) * | 2015-12-04 | 2017-06-08 | Solvay Sa | Methods for dielectrically insulating electrical active parts |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3185734A (en) | 1960-10-25 | 1965-05-25 | Du Pont | Novel polyfluoro-substituted ketones and their preparation from polyfluoro acid fluorides |
| WO1998023363A1 (en) | 1996-11-28 | 1998-06-04 | Solvay Fluor Und Derivate Gmbh | Preparation of homogeneous gas mixtures with sf¿6? |
| WO2001005468A2 (en) | 1999-07-20 | 2001-01-25 | 3M Innovative Properties Company | Use of fluorinated ketones in fire extinguishing compositions |
| WO2010142346A1 (en) | 2009-06-12 | 2010-12-16 | Abb Technology Ag | Dielectric insulation medium |
| WO2011090992A1 (en) * | 2010-01-25 | 2011-07-28 | 3M Innovative Properties Company | Perfluoroketones as gaseous dielectrics |
-
2012
- 2012-10-25 WO PCT/EP2012/071095 patent/WO2013064410A1/en not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3185734A (en) | 1960-10-25 | 1965-05-25 | Du Pont | Novel polyfluoro-substituted ketones and their preparation from polyfluoro acid fluorides |
| WO1998023363A1 (en) | 1996-11-28 | 1998-06-04 | Solvay Fluor Und Derivate Gmbh | Preparation of homogeneous gas mixtures with sf¿6? |
| WO2001005468A2 (en) | 1999-07-20 | 2001-01-25 | 3M Innovative Properties Company | Use of fluorinated ketones in fire extinguishing compositions |
| WO2010142346A1 (en) | 2009-06-12 | 2010-12-16 | Abb Technology Ag | Dielectric insulation medium |
| WO2011090992A1 (en) * | 2010-01-25 | 2011-07-28 | 3M Innovative Properties Company | Perfluoroketones as gaseous dielectrics |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016092115A1 (en) * | 2014-12-12 | 2016-06-16 | Abb Technology Ag | Apparatus for the generation, distribution and/or usage of electrical energy and component for such an apparatus |
| US10818407B2 (en) | 2014-12-12 | 2020-10-27 | Abb Schweiz Ag | Apparatus for the generation, distribution and/or usage of electrical energy and component for such an apparatus |
| EP3079157A1 (en) * | 2015-04-09 | 2016-10-12 | Solvay SA | Methods for dielectrically insulating electrical active parts |
| EP3079156A1 (en) * | 2015-04-09 | 2016-10-12 | Solvay SA | Methods for dielectrically insulating electrical active parts |
| WO2016162573A1 (en) * | 2015-04-09 | 2016-10-13 | Solvay Sa | Methods for dielectrically insulating electrical active parts |
| WO2016162574A1 (en) * | 2015-04-09 | 2016-10-13 | Solvay Sa | Methods for dielectrically insulating electrical active parts |
| WO2017093504A1 (en) * | 2015-12-04 | 2017-06-08 | Solvay Sa | Methods for dielectrically insulating electrical active parts |
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