WO2017084994A1 - Appareil électrique à isolation gazeuse et procédé de fabrication d'un appareil électrique à isolation gazeuse - Google Patents

Appareil électrique à isolation gazeuse et procédé de fabrication d'un appareil électrique à isolation gazeuse Download PDF

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Publication number
WO2017084994A1
WO2017084994A1 PCT/EP2016/077530 EP2016077530W WO2017084994A1 WO 2017084994 A1 WO2017084994 A1 WO 2017084994A1 EP 2016077530 W EP2016077530 W EP 2016077530W WO 2017084994 A1 WO2017084994 A1 WO 2017084994A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
enclosure
electric apparatus
insulated electric
pressure level
Prior art date
Application number
PCT/EP2016/077530
Other languages
English (en)
Inventor
Ulf ÅKESSON
Original Assignee
Abb Schweiz Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Abb Schweiz Ag filed Critical Abb Schweiz Ag
Publication of WO2017084994A1 publication Critical patent/WO2017084994A1/fr

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Classifications

    • 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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/22—Selection of fluids for arc-extinguishing
    • 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
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs
    • H01H2033/566—Avoiding the use of SF6
    • 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
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs
    • H01H33/563—Gas reservoirs comprising means for monitoring the density of the insulating gas

Definitions

  • the invention relates to a gas insulated electric apparatus and a method for producing a gas insulated electric apparatus.
  • the electrical active part is arranged in a gas- tight enclosure or housing, which defines an insulating space that contains an insulating gas, usually with several bar pressure, and which space separates the enclosure from the electrical active part without letting electrical current pass through.
  • the insulation gas serves as an electric insulation medium for preventing electric discharge between the enclosure and the electrical components inside the enclosure and as a cooling medium for suppressing temperature rise due to electric current.
  • the insulation gas also serves as an arc-extinguishing medium for extinguishing arcs that may occur at the switching operation.
  • SF6 gas sulphur hexafluoride gas
  • Conventionally, sulphur hexafluoride gas (SF6 gas) has been widely used as insulation gas.
  • the use of other insulation gases has been proposed, such as carbon dioxide gas, CO2 gas.
  • the enclosure is filled with an insulation gas up to a predetermined operative rated gas pressure level, before it is taken into operation.
  • the pressure level inside the gas insulated electric apparatus is measured during operation and if the gas pressure level is reduced down to a pre-set alarm level, an alarm will go off, as an indication that the enclosure should be replenished with insulation gas.
  • a pre-set blocking pressure level also named lock-out gas pressure level.
  • the gas insulated electrical apparatuses When the gas insulated electrical apparatuses is a switchgear, it is usually configured to react in one of two ways: either the function of the gas insulated electric apparatus will be blocked such that it will not be possible to open or close the electric contact of the switchgear, or the electric contact will be forced open and stay open.
  • Both the pre-set alarm gas pressure level and the pre-set blocking gas pressure level are determined by the manufacturer.
  • the rated gas pressure level also named gas filling pressure, is determined by the manufacturer. All of these pressure levels are part of the technical data for the apparatus. For a gas insulated electric apparatus having SF6 as an insulation gas, the filling pressure will be up to 0.9-1 .0 MPa (absolute pressure).
  • the enclosure is filled with gas up to 1 .1 MPa in order to fulfil the circuit breaking function.
  • the alarm pressure can then be set to a value of 1 .01 MPa
  • the blocking pressure can be set to a value of 1 .0 MPa.
  • the enclosure is filled with insulation gas to a rated gas pressure level at the production plant and tested.
  • the rated gas pressure level is the working gas pressure at which the apparatus is intended to work.
  • the gas pressure is then lowered again for storage and transport.
  • the enclosure is again filled up with gas to the rated gas pressure level, before it is taken into operation.
  • An object of the present invention is to obtain an improved gas insulated electric apparatus that deals with the problems described above.
  • a gas insulated electric apparatus comprising an enclosure and an electric high voltage appliance located inside the enclosure, wherein the enclosure contains an insulation gas comprising at least 80 % by volume of CO2, and wherein the insulation gas inside the enclosure is filled to a gas pressure that exceeds a blocking gas pressure level of the electric apparatus by at least 20 %, at 20°C.
  • blocking gas pressure level is meant a predetermined gas pressure level at which the function of the gas insulated electric apparatus is blocked. If, for example, the blocking gas pressure is set to 1 .0 MPa, the insulation gas containing CO2 should be filled to a pressure of at least 1 .2 MPa in the enclosure.
  • This higher gas pressure is that there will be enough gas in the enclosure to allow for the gas consuming effects discussed above, e.g. adaptation of rubber sealings to metal surfaces, absorption of CO2 of rubber sealings or other components in the enclosure and diffusion through rubber sealings, which typically occur during the initial service time of the apparatus, and still having a remaining gas pressure level that can secure the quenching function of the insulation gas.
  • the insulation gas pressure level inside the enclosure will stabilize at a pressure level that will safeguard the function of the apparatus for a long period of time. Thus, the insulation gas inside the enclosure will not need any refilling for many years, even tens of years.
  • the insulation gas inside the enclosure is filled to a pressure that exceeds a blocking gas pressure level by 20-40 %, at 20°C, or even a pressure that exceeds a blocking gas pressure level by 30-40 %, at 20°C.
  • the insulation gas may also comprise O2 that will contribute to reducing the consumption of CO2 when an arc is quenched.
  • the quantity of O2 is consequently less than 20 % by volume.
  • This 20 % remaining gas extent may also comprise a mixture of other gases than CO2, including O2. It may also be possible not to include any O2 at all.
  • the gas insulated electric apparatus may comprise sealings made of a material comprising isobutylene isoprene rubber. It has been found in tests that this type of rubber will have a lower gas leakage rate of CO2 than e.g. NBR or EPDM rubber. It will thus be advantageous to use MR rubber in order to prolong the time between refillings, and perhaps avoid refillings all together.
  • the electric high voltage appliance may be a high voltage interrupter.
  • the gas insulated electric apparatus may be a gas insulated live tank circuit breaker, or a gas insulated dead tank circuit breaker, or a gas insulated switchgear. It may alternatively be a control gear such as a gas insulated instrument transformer. In either one of these apparatuses it will be of great value to have an apparatus that will have a reliable functionality for many years without requiring refilling of insulation gas.
  • the gas insulated electric apparatus may be an outdoor gas insulated electric apparatus. It is an advantage that the apparatus according to the invention is suitable for outdoor use.
  • the method may comprise filling the insulation gas inside the enclosure to a working gas pressure level that corresponds to a gas pressure, measured at a temperature of 20°C, that exceeds a blocking gas pressure level of the apparatus by 20-40 %measured at a temperature of 20°C.
  • working gas pressure level is meant the gas pressure at which the apparatus is intended to work at the final installation site, when taken into operation.
  • the method may also comprise filling the enclosure, at the installation site, with an insulation gas comprising at least 80 % by volume of CO2 and also comprising O2.
  • the method may comprise providing the gas insulated electric apparatus with sealings made of a material comprising isobutylene isoprene rubber.
  • a refilling requirement has been determined as every 30 years, which means a leak rate per year of 0.4 to 1 %. Further, calculations have shown that such a gas insulated electric apparatus will keep its functions also at very low temperatures, even as low as down to -
  • high voltage HV is in the present context meant voltages above 1 000 V, in accordance with IEC 62271 -1 , and IEC 62271 -100.
  • sealing any type of suitable element have a sealing function, such as O- rings, X-rings, gaskets, washers etc.
  • the sealings can e.g. be of the type that is placed in a groove or on a flat surface.
  • Fig. 1 shows a schematic perspective view of an embodiment of a gas insulated electric apparatus according to the invention, with a partial detail enlargement
  • Fig. 2 shows a partial cross section view of an embodiment of a gas insulated electric apparatus according to the invention
  • Fig. 3 is a schematic diagram showing the main steps of a method according to the invention.
  • the electric apparatus in the example is a circuit breaker, e.g. a circuit breaker for one pole in a three pole circuit breaker assembly.
  • the circuit breaker 1 comprises a hollow upper high voltage (HV) unit insulator 3 and a hollow lower support insulator 5.
  • the upper insulator and the lower insulator are connected to each other by means of a lower end of the upper insulator being connected to an upper end of the lower insulator.
  • the hollow upper insulator 3 and the hollow lower insulator 5 form an enclosure 7 that delimits an insulation space 10.
  • the enclosure 7 is filled with an insulation gas 8.
  • the gas insulated electric apparatus of the example further includes an electric high voltage appliance 9 located inside the enclosure 7, in the insulation space 10.
  • the high voltage appliance is a high voltage interrupter that is located inside the upper insulator 3, see also Fig. 2.
  • the interrupter may e.g. be a puffer type interrupter, as shown in Fig. 2.
  • the upper end of the upper insulator 3 is closed off by a top cover 1 1 .
  • a mechanism housing 13 At the lower end of the lower insulator 5 is arranged a mechanism housing 13. Inside the mechanism housing 13 is located a link mechanism 15 that connects a lower end of a support insulator pull rod 17 to an operating shaft 19, as is shown in the enlarged detail view of Fig. 1.
  • the pull rod extends all the way up through the lower insulator and into the upper insulator where it is connected to the interrupter 9.
  • the interrupter 9 of the circuit breaker can be operated by means of the operating shaft 19.
  • the operating shaft 19 will be connected to the circuit breakers of all three poles and they can consequently be operated simultaneously.
  • the mechanism housing 13 also includes connections (not shown) to a gas pipe (not shown) for filling the enclosure with gas and e.g. a connection (not shown) to a gas density monitor device (not shown).
  • the enclosure 7 is sealed off with sealings 21 at all connection areas and the gas pipe connection comprises a non-return valve.
  • the insulation gas 8 comprises at least 80 % by volume of
  • the enclosure 7 is filled with insulation gas to a gas pressure that exceeds a blocking gas pressure level of the electric apparatus, i.e. the circuit breaker in the example, by at least 20 %, at approximately 20°C.
  • the insulation gas inside the enclosure is filled to a gas pressure that exceeds a blocking gas pressure level by 20-40 %, at 20°C, or alternatively to a gas pressure that exceeds a blocking gas pressure level by 30-40 %, at 20°C.
  • the insulation gas also comprises O2, or another gas to an extent of less than 20 % by volume. This 20 % remaining gas extent may also comprise a mixture of other gases than CO2, including O2.
  • the electric apparatus also comprises sealings 21 , and at least some of these sealings are made of a material comprising isobutylene isoprene rubber (MR) as the main component.
  • the sealings may be sealings located in contact areas between metal parts, between metal and polymer or rubber materials, or between parts made of rubber or polymer materials. The sealings are located in different contact areas of the parts of the apparatus, both for sealing of the enclosure towards the exterior as well as sealings applied to parts and components inside the enclosure.
  • sealing areas where sealings are used are the contact area between the upper insulator 3 and the lower insulator 5, the contact area between the upper insulator 3 and the top cover 1 1 , sealings between the lower insulator 5 and the mechanism housing 13 and parts of the mechanism housing, sealings associated with the HV interrupter or other HV electric appliance of the electric apparatus.
  • the gas insulated electric apparatus has been illustrated as a gas insulated circuit breaker. It can then find its application as a gas insulated live tank circuit breaker or a gas insulated dead tank circuit breaker.
  • the gas insulated electric apparatus may e.g. be a gas insulated switchgear, or a control gear such as a gas insulated instrument transformer.
  • the gas insulated apparatus in the example is suitable for use outdoors.
  • Fig. 3 is illustrated the main steps of an embodiment of a method, according to the invention, for producing a gas insulated electric apparatus 1 comprising the steps of
  • step 200 transporting the gas insulated electric apparatus 1 to an installation site, step 200, - filling the enclosure 7, at the installation site, with an insulation gas 8 comprising at least 80 % by volume of CO2, to a working gas pressure level, which working gas pressure level corresponds to a gas pressure, measured at a temperature of 20°C, that exceeds a blocking gas pressure level of the apparatus by at least 20 % measured at a temperature of 20°C, step 300.
  • the method may comprise filling the insulation gas inside the enclosure to a working gas pressure level that corresponds to a gas pressure, measured at a temperature of 20°C, that exceeds a blocking gas pressure level of the apparatus by 20-40 % measured at a temperature of 20°C, or filling the insulation gas inside the enclosure to a working gas pressure level that corresponds to a gas pressure, measured at a temperature of 20°C, that exceeds a blocking gas pressure level of the apparatus by 30-40 % measured at a temperature of 20°C.
  • the method may comprise filling the enclosure, at the installation site, with an insulation gas comprising at least 80 % by volume of CO2 and also comprising O2.
  • the method may further comprise the step of providing the gas insulated electric apparatus 1 with sealings 21 made of a material comprising isobutylene isoprene rubber.
  • the apparatus is usually tested before transported to the installation site.
  • the enclosure is then filled with insulation gas to the working gas pressure level (rated gas pressure level) at the production plant and tested.
  • the gas pressure is then lowered again for storage and transport.

Landscapes

  • Gas-Insulated Switchgears (AREA)

Abstract

L'invention concerne un appareil électrique à isolation gazeuse (1) comprenant une enveloppe de protection (7) et un appareil électrique haute tension (9) situé à l'intérieur de l'enveloppe de protection. L'enveloppe de protection (7) contient un gaz isolant (8) comprenant au moins 80 % en volume de CO2, et le gaz isolant est introduit à l'intérieur de l'enveloppe de protection à une pression qui dépasse d'au moins 20 % un niveau de pression de gaz de blocage de l'appareil électrique, à 20 °C. Un procédé correspondant de fabrication d'un appareil électrique à isolation gazeuse correspondant est également décrit.
PCT/EP2016/077530 2015-11-17 2016-11-14 Appareil électrique à isolation gazeuse et procédé de fabrication d'un appareil électrique à isolation gazeuse WO2017084994A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15195013.6 2015-11-17
EP15195013.6A EP3171382A1 (fr) 2015-11-17 2015-11-17 Appareil électrique isolé par gaz et procédé de fabrication d'un appareil électrique à isolation gazeuse

Publications (1)

Publication Number Publication Date
WO2017084994A1 true WO2017084994A1 (fr) 2017-05-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/077530 WO2017084994A1 (fr) 2015-11-17 2016-11-14 Appareil électrique à isolation gazeuse et procédé de fabrication d'un appareil électrique à isolation gazeuse

Country Status (2)

Country Link
EP (1) EP3171382A1 (fr)
WO (1) WO2017084994A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3416178A1 (fr) * 2017-06-13 2018-12-19 ABB Schweiz AG Appareil électrique isolé par gaz doté de moyen pour empêcher une fuite de gaz

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052555A (en) * 1975-07-23 1977-10-04 Allied Chemical Corporation Gaseous dielectric compositions
GB1554425A (en) * 1976-02-02 1979-10-24 Allied Chem Composition containing carbon dioxide for suppressing carbon formation in electric discharges
EP2284854A1 (fr) * 2008-05-29 2011-02-16 Kabushiki Kaisha Toshiba Commutateur d'isolement de gaz

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052555A (en) * 1975-07-23 1977-10-04 Allied Chemical Corporation Gaseous dielectric compositions
GB1554425A (en) * 1976-02-02 1979-10-24 Allied Chem Composition containing carbon dioxide for suppressing carbon formation in electric discharges
EP2284854A1 (fr) * 2008-05-29 2011-02-16 Kabushiki Kaisha Toshiba Commutateur d'isolement de gaz

Also Published As

Publication number Publication date
EP3171382A1 (fr) 2017-05-24

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