EP2560179A1 - Vacuum arc extinguishing chamber with double breaks - Google Patents

Vacuum arc extinguishing chamber with double breaks Download PDF

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Publication number
EP2560179A1
EP2560179A1 EP10846310A EP10846310A EP2560179A1 EP 2560179 A1 EP2560179 A1 EP 2560179A1 EP 10846310 A EP10846310 A EP 10846310A EP 10846310 A EP10846310 A EP 10846310A EP 2560179 A1 EP2560179 A1 EP 2560179A1
Authority
EP
European Patent Office
Prior art keywords
isolation shield
vacuum interrupter
middle isolation
insulating shell
double
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.)
Withdrawn
Application number
EP10846310A
Other languages
German (de)
French (fr)
Other versions
EP2560179A4 (en
Inventor
Jianfei Liu
Jie Wei
Dongmei Yang
Guoliang Xie
Zhiyuan Liu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Jiaotong University
Beijing Sojo Electric Co Ltd
Original Assignee
Xian Jiaotong University
Beijing Sojo Electric Co Ltd
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 Xian Jiaotong University, Beijing Sojo Electric Co Ltd filed Critical Xian Jiaotong University
Publication of EP2560179A1 publication Critical patent/EP2560179A1/en
Publication of EP2560179A4 publication Critical patent/EP2560179A4/en
Withdrawn legal-status Critical Current

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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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
    • H01H2033/66276—Details relating to the mounting of screens in vacuum switches
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
    • H01H2033/66284—Details relating to the electrical field properties of screens in vacuum switches

Definitions

  • the invention refers to a vacuum interrupter, more particularly, to a double-break vacuum interrupter.
  • a conventional vacuum interrupter mostly has a single break.
  • the insulation capability of the vacuum interrupter is not linearly increased with the vacuum gap length, and there is saturation effect.
  • the maximum withstand voltage over each gap may be unequal and the whole breakdown voltage is determined by the gap of the maximum electric field E max . As long as n breaks are not breakdown simultaneously at a moment, the vacuum gaps will present a reliable voltage-withstand capability.
  • the electric field distribution in the vacuum interrupter can be improved by multi-gap effect.
  • the purpose of the invention is to provide a double-break vacuum interrupter, which can increase the static breakdown voltage in the vacuum interrupter.
  • the solution of the invention is a double-break vacuum interrupter including an insulating shell, a static component and a dynamic component located in the insulating shell, wherein a middle isolation shield is provided at a convex edge in the upper part of the cavity of the said insulating shell, the said middle isolation shield is located between the static and the dynamic components, and the said middle isolation shield is a circular ring.
  • the said middle isolation shield is provided at the said convex edge, and a barrel support with an arc section of a small top and big bottom is provided between the middle isolation shield and the convex edge.
  • the double-break vacuum interrupter according to the invention has the circular middle isolation shield provided at the convex edge in the upper part of the cavity of the insulating shell, thus the cavity of the vacuum interrupter changes from a single break to two breaks and the vacuum gap therebetween changes from one to two. Due to the two breaks, the maximum electric field intensity can be transferred from the contact gap to the gap between the middle isolation shield and the static isolation shield or the ground isolation shield, improving the electric field stress of the main isolation gap and increasing the static breakdown voltage of the vacuum interrupter.
  • the schematic structure of the double-break vacuum interrupter according to the invention including an insulating shell 1, a static component 2 and a dynamic component 3 located in the insulating shell 1, at a convex edge 11 in the upper part of the cavity of the insulating shell 1 is provided a barrel support 5 with an arc section of small top and big bottom, an circular middle isolation shield 4 is provided on the barrel support 5, and the circular middle isolation shield 4 is positioned below the static component and above the dynamic component.
  • the vacuum interrupter according to the invention has the circular middle isolation shield 4 positioned at the convex edge 11 in the upper part of the cavity of the insulating shell 1, thus the cavity of the vacuum interrupter changes from a single break to double breaks and the vacuum gap therebetween changes from one to two. Due to the two breaks, the maximum field density can be transferred from the contact gap to the gap between the middle isolation shield and the static isolation shield or the ground isolation shield, improving the electric field stress of the main isolation gap and increasing the static breakdown voltage in the vacuum interrupter.
  • the double-break vacuum interrupter according to the invention is mainly used in a fully enclosed solid ring main unit, which improves the electric field stress of the main isolation gap and increases the static breakdown voltage in the vacuum interrupter; thereby it has high industrial applicability.

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  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Abstract

A double-break vacuum interrupter is disclosed. The vacuum interrupter is mainly used in Medium voltage power switch device and includes an insulating shell, a static component and a dynamic component located in the insulating shell, wherein a middle isolation shield is provided at a convex edge in the upper part of the cavity of the said insulating shell, the said middle isolation shield is located between the static and the dynamic components, and the said middle isolation shield is a circular ring. The static withstand voltage level in the double-break vacuum interrupter according to the invention can be improved by setting the middle isolation shield in the upper part of the insulating shell.

Description

    Field of the Invention
  • The invention refers to a vacuum interrupter, more particularly, to a double-break vacuum interrupter.
    • Background of the Invention
  • A conventional vacuum interrupter mostly has a single break. The relationship between the insulation capability of the vacuum interrupter and break gap is: Vb=a*dm, where d refers to the gap, a and m are constant and m is less than 1. In other words, the insulation capability of the vacuum interrupter is not linearly increased with the vacuum gap length, and there is saturation effect. However, the whole working voltage can be increased by means of Multi-gap Effect generated by connecting a plurality of vacuum gaps in series. It is assumed that a long gap is divided into n parts and the length of every gap is dn, then the whole gap length is d=n×dn. The maximum withstand voltage over each gap may be unequal and the whole breakdown voltage is determined by the gap of the maximum electric field Emax. As long as n breaks are not breakdown simultaneously at a moment, the vacuum gaps will present a reliable voltage-withstand capability. The electric field distribution in the vacuum interrupter can be improved by multi-gap effect.
    • Summary of the Invention
  • The purpose of the invention is to provide a double-break vacuum interrupter, which can increase the static breakdown voltage in the vacuum interrupter.
  • In order to achieve the above purpose, the solution of the invention is a double-break vacuum interrupter including an insulating shell, a static component and a dynamic component located in the insulating shell, wherein a middle isolation shield is provided at a convex edge in the upper part of the cavity of the said insulating shell, the said middle isolation shield is located between the static and the dynamic components, and the said middle isolation shield is a circular ring.
  • In the vacuum interrupter according to the invention, the said middle isolation shield is provided at the said convex edge, and a barrel support with an arc section of a small top and big bottom is provided between the middle isolation shield and the convex edge.
  • By adopting the above solution, the double-break vacuum interrupter according to the invention has the circular middle isolation shield provided at the convex edge in the upper part of the cavity of the insulating shell, thus the cavity of the vacuum interrupter changes from a single break to two breaks and the vacuum gap therebetween changes from one to two. Due to the two breaks, the maximum electric field intensity can be transferred from the contact gap to the gap between the middle isolation shield and the static isolation shield or the ground isolation shield, improving the electric field stress of the main isolation gap and increasing the static breakdown voltage of the vacuum interrupter.
    • Brief Description of the Drawings
    • Fig.1 is schematic structure of the double-break vacuum interrupter according to the invention.
  • The invention will be further explained by means of the following embodiment in combination of the accompanying drawing.
    • Detailed Description of the Invention
  • Referring to the Fig.1, the schematic structure of the double-break vacuum interrupter according to the invention is shown, including an insulating shell 1, a static component 2 and a dynamic component 3 located in the insulating shell 1, at a convex edge 11 in the upper part of the cavity of the insulating shell 1 is provided a barrel support 5 with an arc section of small top and big bottom, an circular middle isolation shield 4 is provided on the barrel support 5, and the circular middle isolation shield 4 is positioned below the static component and above the dynamic component.
  • The vacuum interrupter according to the invention has the circular middle isolation shield 4 positioned at the convex edge 11 in the upper part of the cavity of the insulating shell 1, thus the cavity of the vacuum interrupter changes from a single break to double breaks and the vacuum gap therebetween changes from one to two. Due to the two breaks, the maximum field density can be transferred from the contact gap to the gap between the middle isolation shield and the static isolation shield or the ground isolation shield, improving the electric field stress of the main isolation gap and increasing the static breakdown voltage in the vacuum interrupter.
  • The embodiment described above is only the preferred embodiment of the invention and is not intended to limit the scope of the present invention. It will be understood by those ordinary researcher in this technology field that various modifications and improvements to the embodiment will fall into the scope of the present invention defined by the appended claims.
    • Industrial Applicability of the Invention
  • The double-break vacuum interrupter according to the invention is mainly used in a fully enclosed solid ring main unit, which improves the electric field stress of the main isolation gap and increases the static breakdown voltage in the vacuum interrupter; thereby it has high industrial applicability.

Claims (2)

  1. A double-break vacuum interrupter includes an insulating shell (1), a static component (2) and a dynamic component (3) located in the insulating shell (1), wherein
    a middle isolation shield (4) is provided at a convex edge (11) in the upper part of a cavity of the insulating shell (1), the said middle isolation shield (4) is provided between the static and the dynamic components (2,3), and
    the said middle isolation shield (4) is a circular ring.
  2. The double-break vacuum interrupter according to claim 1, wherein the said middle isolation shield (4) is positioned above the said convex edge (11), and a barrel support (5) with an arc section of small top and big bottom is provided between the middle isolation shield (4) and the convex edge (11).
EP10846310.0A 2010-04-15 2010-04-23 DOUBLE SWITCHED VACUUM ARC EXTINGUISHING CHAMBER Withdrawn EP2560179A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 201010147463 CN101894706A (en) 2010-04-15 2010-04-15 Double break vacuum interrupter
PCT/CN2010/072105 WO2011127667A1 (en) 2010-04-15 2010-04-23 Vacuum arc extinguishing chamber with double breaks

Publications (2)

Publication Number Publication Date
EP2560179A1 true EP2560179A1 (en) 2013-02-20
EP2560179A4 EP2560179A4 (en) 2014-06-11

Family

ID=43103863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10846310.0A Withdrawn EP2560179A4 (en) 2010-04-15 2010-04-23 DOUBLE SWITCHED VACUUM ARC EXTINGUISHING CHAMBER

Country Status (3)

Country Link
EP (1) EP2560179A4 (en)
CN (1) CN101894706A (en)
WO (1) WO2011127667A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103198970A (en) * 2013-03-20 2013-07-10 上海华明电力设备制造有限公司 Vacuum envelope with double-fracture structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103035441A (en) * 2012-12-17 2013-04-10 大连理工大学 One-line series short gap double fracture vacuum interrupter

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4216360A (en) * 1978-07-27 1980-08-05 Westinghouse Electric Corp. Low voltage vacuum switch with internal arcing shield
US4233480A (en) * 1978-09-20 1980-11-11 Westinghouse Electric Corp. Low voltage vacuum switch with three internal contacts including a center floating contact
DE3887725T2 (en) * 1987-09-29 1994-09-01 Mitsubishi Electric Corp Vacuum unloading device.
NL8901748A (en) * 1989-07-07 1991-02-01 Holec Syst & Componenten METHOD FOR ATTACHING A METAL SCREEN IN THE HOUSING OF A VACUUM SWITCH, SCREEN THEREFOR, AND VACUUM SWITCH PROVIDED WITH SUCH SCREEN.
DE29910718U1 (en) * 1999-06-11 1999-12-09 Siemens AG, 80333 München Vacuum interrupter with a steam screen
US6506481B2 (en) * 2000-01-26 2003-01-14 Ngk Spark Plug Co., Ltd. Ceramic member for bonding, process for producing the same, vacuum switch, and vacuum vessel
JP2001222935A (en) * 2000-02-08 2001-08-17 Toshiba Corp Vacuum switchgear
FR2841682B1 (en) * 2002-06-27 2004-12-10 Schneider Electric Ind Sas VACUUM BULB FOR AN ELECTRICAL PROTECTIVE APPARATUS SUCH AS A SWITCH OR CIRCUIT BREAKER
CN101789328B (en) * 2010-03-25 2012-05-23 北京双杰电气股份有限公司 Three-station vacuum arc extinguish chamber for all-solid switch cabinet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103198970A (en) * 2013-03-20 2013-07-10 上海华明电力设备制造有限公司 Vacuum envelope with double-fracture structure
CN103198970B (en) * 2013-03-20 2015-03-18 上海华明电力设备制造有限公司 Vacuum envelope with double-fracture structure

Also Published As

Publication number Publication date
EP2560179A4 (en) 2014-06-11
WO2011127667A1 (en) 2011-10-20
CN101894706A (en) 2010-11-24

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