EP1037233A2 - Schaltanlage - Google Patents

Schaltanlage Download PDF

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Publication number
EP1037233A2
EP1037233A2 EP00105357A EP00105357A EP1037233A2 EP 1037233 A2 EP1037233 A2 EP 1037233A2 EP 00105357 A EP00105357 A EP 00105357A EP 00105357 A EP00105357 A EP 00105357A EP 1037233 A2 EP1037233 A2 EP 1037233A2
Authority
EP
European Patent Office
Prior art keywords
contactor
moving
electric field
fixed
fixed contactor
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Withdrawn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
EP00105357A
Other languages
English (en)
French (fr)
Other versions
EP1037233A3 (de
Inventor
Minoru Kobayashi
Toshimasa Maruyama
Toshifumi Sato
Seiichi Miyamoto
Takayuki Itotani
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP1037233A2 publication Critical patent/EP1037233A2/de
Publication of EP1037233A3 publication Critical patent/EP1037233A3/de
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing

Definitions

  • This invention relates to a switchgear having a circuit making and breaking section in a vacuum vessel maintained in a high vacuum for making and breaking a circuit between a power supply and a load machine and in particular to a switchgear for preventing degradation of withstand voltage performance.
  • a switchgear for making and breaking a circuit between a power supply and a load machine has a circuit making and breaking section in a vacuum vessel maintained in a high vacuum and uses a high dielectric strength in a high vacuum and an excellent arc-extinguishing capability to stably shut off a current.
  • FIG. 5 is an elevational sectional view to show a switchgear in a related art.
  • numeral 1 denotes a vacuum vessel, which is a vessel for holding the inside in a high vacuum by hermetically sealing both ends of a cylindrical insulating pipe 2 forming flanks by a lower lid 3 and an upper lid 4.
  • a cylindrical moving conductor rod 8 penetrating the vacuum vessel 1 through the center of the upper lid 4 is supported movably in an axial direction via an extendable bellows 9 attached in the vacuum vessel 1.
  • a disc-like moving contactor 10 opposed on the bottom face to the top face of the fixed contactor 6 and formed in a diameter to the same degree as that of the moving conductor rod 8 is fixedly secured to the bottom end of the moving conductor rod 8 in the vacuum vessel 1 in an insertion state, and the margin of the bottom face of the moving contactor 10 is chaffered so as to become a curved surface to prevent an electric field from concentrating.
  • the bellows 9 is hermetically sealed at the top end part to the upper lid 4 of the vacuum vessel 1, covers the moving conductor rod 8, is hermetically sealed at the lower end part at a position to such an extent to expose the lower part of the moving conductor rod 8 to a proper length, and expands and contracts as the moving conductor rod 8 makes a move axially, so that the hermeticity of the vacuum vessel 1 can be held.
  • the top face of the fixed contactor 6 and the bottom face of the moving contractor 10 are opposed to each other and when the moving conductor rod 8 moves downward, the moving contractor 10 comes in contact with the fixed contactor 6, placing the switchgear in a make state.
  • the moving conductor rod 8 is caused to make a move upward for shutting off a current to make the make-to-break state transition of the switchgear, an arc occurs between the fixed contactor 6 and the moving contactor 10 and is extinguished, then the switchgear enters a break state.
  • the switchgear To place the switchgear in a make state for energization in a state in which the contact surfaces of the fixed contactor 6 and the moving contactor 10 are rough, the resistance values of the contact parts of the fixed contactor 6 and the moving contactor 10 are increased because of the presence of the points and thus high heat is generated, fusing the contact parts. Then, when the switchgear is placed in a break state, the contact surfaces are furthermore made rough, forming points.
  • It is another object of the invention to provide a switchgear comprising an electric field easing member shaped like a disc having a larger diameter than a fixed contactor has and sandwiched between the fixed contactor and a fixed conductor rod on the fixed contactor side and an electric field easing member shaped like a cylinder having a larger diameter than a moving contactor or a moving conductor rod has and placed in the surroundings of the moving contactor or the moving conductor rod on the moving contactor side, whereby the electric field easing member can also serve as a bellows cover, for example, for preventing degradation of withstand voltage performance without increasing the number of parts as compared with a switch gear in a related art.
  • a switchgear comprising:
  • Each of the switchgears of the first and second aspects of the invention comprises the electric field easing members each projecting from the fixed contactor or the moving contactor in the surroundings of the fixed contactor and the moving contactor, whereby if either or both of the contact surfaces of the fixed contactor and the moving contactor are made rough and points are formed, concentration of an electric field on each point is eased and degradation of withstand voltage performance can be prevented. (Aspect 3)
  • the switchgear according to aspect 1 further comprising:
  • the switchgear of the third aspect of the invention comprises the electric field easing member shaped like a disc having a larger diameter than the fixed contactor has and sandwiched between the fixed contactor and the fixed conductor rod on the fixed contactor side and the electric field easing member shaped like a cylinder having a larger diameter than the moving contactor or the moving conductor rod has and placed in the surroundings of the moving contactor or the moving conductor rod on the moving contactor side, whereby the part of the switchgear in the related art, for example, a bellows cover is deformed or replaced, so that the number of parts is not increased and if the surface of either or both of the fixed contactor and the moving contactor is made rough and points are formed, concentration of an electric field on each point is eased, thus degradation of withstand voltage performance can be prevented.
  • the moving contactor moves linearly.
  • FIGS. 1 and 2 are elevational sectional views to show a switchgear in a first embodiment of the invention; FIG. 1 shows a break state and FIG. 2 shows a make state.
  • numeral 1 denotes a vacuum vessel, which is a vessel for holding the inside in a high vacuum by hermetically sealing both ends of a cylindrical insulating pipe 2 forming flanks by a lower lid 3 and an upper lid 4.
  • a cylindrical fixed conductor rod 5 is fixed in a state in which it penetrates the vacuum vessel 1.
  • the upper diameter of the fixed conductor rod 5 in the vacuum vessel 1 is formed larger than that of any other portion.
  • a disc-like fixed contactor 6 formed in a diameter smaller than the upper diameter of the fixed conductor rod 5 is brazed via a metal jointing material 7 formed in a diameter to the same degree as the upper diameter of the fixed conductor rod 5 to the center of the top face of the fixed conductor rod 5, and the margin of the top face of the fixed contactor 6 is chaffered so as to become a curved surface to prevent an electric field from concentrating.
  • the surrounding of the fixed contactor 6, namely, the margin of the metal jointing material 7 is molded so as to project above the fixed contactor 6 and the fixed contactor 6 is buried in the recess center of the metal jointing material 7.
  • the upward projecting margin of the metal jointing material 7 is also chaffered so as to become a curved surface to prevent an electric field from concentrating.
  • the metal jointing material 7 is thus concave in cross section, concentration of an electric field on the vicinity of the buried fixed contactor 6 is eased.
  • a cylindrical moving conductor rod 8 penetrating the vacuum vessel 1 through the center of the upper lid 4 is supported movably in an axial direction via an extendable bellows 9 attached in the vacuum vessel 1.
  • a disc-like moving contactor 10 formed in a diameter to the same degree as that of the moving conductor rod 8 is fixedly secured to the bottom end of the moving conductor rod 8 in the vacuum vessel 1 in an insertion state, and the margin of the bottom face of the moving contactor 10 is chaffered so as to become a curved surface to prevent an electric field from concentrating.
  • the bellows 9 is hermetically sealed at the top end part to the upper lid 4 of the vacuum vessel 1, covers the moving conductor rod 8, is hermetically sealed at the lower end part at a position to such an extent to expose the lower part of the moving conductor rod 8 to a proper length, and expands and contracts as the moving conductor rod 8 makes a move axially, so that the hermeticity of the vacuum vessel 1 can be held.
  • a cylindrical electric field easing shield 11 having a diameter to such an extent that it does not come in contact with the bellows 9 is fixedly secured at the top end to the upper lid 4, and the bottom end of the electric field easing shield 11 is bent inward like an inward flange.
  • the bottom end of the electric field easing shield 11 is shaped like a plane having an opening at the center, the diameter of the opening is formed a little larger than that of the moving conductor rod 8 or the moving contactor 10, and the tip of the opening is bent upward to prevent an electric field from concentrating.
  • the side wall of the electric field easing shield 11 is formed to a length to such an extent that it projects to the fixed contactor 6 side from the moving contactor 10 if the moving conductor rod 8 is in the upper limit of the move area.
  • the electric field easing shield 11 is formed of a low-conductivity material such as stainless steel so that the bend part becomes a curved surface by a working method of drawing and press, etc., to prevent an electric field from concentrating.
  • the electric field easing shield 11 also has a function of protecting the bellows 9 from metal vapor caused by an arc like the bellows cover 13 of the switchgear in the related art, it eliminates the need for the bellows cover 13, thus the number of parts does not increase.
  • the top face of the fixed contactor 6 and the bottom face of the moving contractor 10 are opposed to each other.
  • the moving contractor 10 comes in contact with the fixed contactor 6, placing the switchgear in a make state.
  • the moving conductor rod 8 is caused to make a move upward for shutting off a current to make the make-to-break state transition of the switchgear, an arc occurs between the fixed contactor 6 and the moving contactor 10 and is extinguished, then the switchgear enters a break state.
  • a contact-to-contact distance d1 between the fixed contactor 6 and the moving contractor 10 becomes longer than a distance d2 between the top end of the metal jointing material 7 and the bottom end of the electric field easing shield 11. If the contact surfaces are made rough and points are formed due to an arc occurring between the fixed contactor 6 and the moving contractor 10 when an electric current is shut off and fusion of the contact parts of the fixed contactor 6 and the moving contractor 10 by heat generated upon energization, the distance between the points of the fixed contactor 6 and the moving contractor 10 does not become shorter than the distance d2 between the projection end of the metal jointing material 7 and an opposite end of the electric field easing shield 11. Thus, concentration of an electric field on each point is eased and an electric field distribution between the contactors is made uniform.
  • FIG. 3 is a graph to show the simulation results of the switch gear of the invention and that in the related art.
  • the calculated electric field at the voltage application time is plotted on the vertical axis with the calculated electric field in the vicinity of the end part in the contactor of the switchgear in the related art with a rough contact surface as 100%.
  • the ⁇ mark indicates the calculated electric field in the vicinity of the end part in the contactor with the rough contact surface and the calculated electric field of the switchgear of the invention comprising the electric field easing shield is about 50% of the calculated electric field of the switchgear in the related art comprising no electric field easing shield.
  • the ⁇ mark indicates the calculated electric field at the center in the contactor with the rough contact surface and the calculated electric field off the switchgear of the invention comprising the electric field easing shield is about 70% of the calculated electric field of the switchgear in the related art comprising no electric field easing shield.
  • FIG. 4 is an elevational sectional view to show the break state of a switchgear in a second embodiment of the invention.
  • the diameter of a fixed conductor rod 5 is made constant and in place of a metal jointing material 7 for burying a fixed contactor 6, a disc-like fixed conductor rod side electric field easing shield 12 having a larger diameter than the fixed contactor 6 has is provided.
  • the fixed conductor rod side electric field easing shield 12 is sandwiched concentrically between the top face of the fixed conductor rod 5 and the bottom face of the fixed contactor 6 and the surrounding of the fixed contactor 6, namely, the margin of the fixed conductor rod side electric field easing shield 12 is molded so as to project to the side of a moving contactor 8 from the fixed contactor 6, so that the fixed contactor 6 is buried in the recess part at the center of the fixed conductor rod side electric field easing shield 12.
  • the fixed conductor rod side electric field easing shield 12 is formed of a low-conductivity material such as stainless steel so that the bend part and the outermost margin become curved surfaces by a working method of drawing and press, etc., to prevent an electric field from concentrating.
  • the fixed conductor rod side electric field easing shield 12 that can be manufactured comparatively easily is provided, whereby the fixed conductor rod 5 can be shaped to a form having a constant diameter easily molded.
  • the switchgear according to the invention comprises the electric field easing members each projecting from the fixed contactor or the moving contactor in the surroundings of the fixed contactor and the moving contactor, whereby if either or both of the contact surfaces of the fixed contactor and the moving contactor are made rough and points are formed, concentration of an electric field on each point is eased and degradation of withstand voltage performance can be prevented.
  • the switchgear according to the invention comprises the electric field easing member shaped like a disc having a larger diameter than the fixed contactor has and sandwiched between the fixed contactor and the fixed conductor rod on the fixed contactor side and the electric field easing member shaped like a cylinder having a larger diameter than the moving contactor or the moving conductor rod has and placed in the surroundings of the moving contactor or the moving conductor rod on the moving contactor side, whereby the part of the switchgear in the related art is deformed or replaced, so that the number of parts is not increased and if the surface of either or both of the fixed contactor and the moving contactor is made rough and points are formed, concentration of an electric field on each point is eased, thus degradation of withstand voltage performance can be prevented.

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
EP00105357A 1999-03-18 2000-03-17 Schaltanlage Withdrawn EP1037233A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11074538A JP2000268684A (ja) 1999-03-18 1999-03-18 スイッチギア
JP7453899 1999-03-18

Publications (2)

Publication Number Publication Date
EP1037233A2 true EP1037233A2 (de) 2000-09-20
EP1037233A3 EP1037233A3 (de) 2002-09-11

Family

ID=13550166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00105357A Withdrawn EP1037233A3 (de) 1999-03-18 2000-03-17 Schaltanlage

Country Status (6)

Country Link
EP (1) EP1037233A3 (de)
JP (1) JP2000268684A (de)
KR (1) KR20000071457A (de)
CN (1) CN1267897A (de)
SG (1) SG79304A1 (de)
TW (1) TW445473B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1376634A1 (de) * 2002-06-27 2004-01-02 Schneider Electric Industries Sas Vakuumröhre für elektrisches Schutzgerät wie z.B. einen Schalter oder einen Lastschalter
WO2011006783A1 (de) * 2009-07-16 2011-01-20 Siemens Aktiengesellschaft Vakuumschaltröhre

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5171298B2 (ja) * 2008-02-12 2013-03-27 株式会社東芝 樹脂モールド真空バルブ
JP6039266B2 (ja) * 2012-06-25 2016-12-07 株式会社東芝 真空バルブ
CN111816502B (zh) * 2020-08-27 2020-12-11 广东电网有限责任公司东莞供电局 一种真空断路器的操作机构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239635A (en) * 1964-11-17 1966-03-08 Baude John Disc shaped arcing contact structure producing predetermined arc blowout characteristic
DE2063120A1 (de) * 1970-12-16 1972-06-29 Siemens Ag Vakuumschalter
US4250363A (en) * 1978-12-06 1981-02-10 Electric Power Research Institute, Inc. Electrical circuit breaking device and method
US4542266A (en) * 1983-01-24 1985-09-17 Siemens Aktiengesellschaft Contact arrangement for vacuum switches
JPH01128324A (ja) * 1987-11-13 1989-05-22 Mitsubishi Electric Corp 真空スイッチ
DE19603158A1 (de) * 1996-01-19 1997-07-24 Fachhochschule Fuer Technik Un Hochspannungs-Vakuumschalter

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081640A (en) * 1976-04-19 1978-03-28 General Electric Company Compact vacuum switch for high voltage circuit interruption
CA1084565A (en) * 1976-07-21 1980-08-26 James M. Lafferty High-current vacuum switch with reduced contact erosion
DE3035875A1 (de) * 1980-09-23 1982-05-06 Siemens AG, 1000 Berlin und 8000 München Kontaktanordnung fuer vakuumschalter
DE8534022U1 (de) * 1985-12-03 1987-06-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
DE19603081B4 (de) * 1996-01-19 2004-09-30 Müller, Ottmar, Prof. Dr.-Ing.habil. Hochspannungs-Vakuumschalter
DE19806329A1 (de) * 1998-02-05 1998-08-06 Mueller Ottmar Prof Dr Ing Hab Hochspannungs-Vakuumschaltkammer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239635A (en) * 1964-11-17 1966-03-08 Baude John Disc shaped arcing contact structure producing predetermined arc blowout characteristic
DE2063120A1 (de) * 1970-12-16 1972-06-29 Siemens Ag Vakuumschalter
US4250363A (en) * 1978-12-06 1981-02-10 Electric Power Research Institute, Inc. Electrical circuit breaking device and method
US4542266A (en) * 1983-01-24 1985-09-17 Siemens Aktiengesellschaft Contact arrangement for vacuum switches
JPH01128324A (ja) * 1987-11-13 1989-05-22 Mitsubishi Electric Corp 真空スイッチ
DE19603158A1 (de) * 1996-01-19 1997-07-24 Fachhochschule Fuer Technik Un Hochspannungs-Vakuumschalter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 374 (E-808), 18 August 1989 (1989-08-18) & JP 01 128324 A (MITSUBISHI ELECTRIC CORP), 22 May 1989 (1989-05-22) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1376634A1 (de) * 2002-06-27 2004-01-02 Schneider Electric Industries Sas Vakuumröhre für elektrisches Schutzgerät wie z.B. einen Schalter oder einen Lastschalter
FR2841682A1 (fr) * 2002-06-27 2004-01-02 Schneider Electric Ind Sas Ampoule a vide pour un appareil de protection electrique tel un interrupteur ou un disjoncteur
US6762388B2 (en) 2002-06-27 2004-07-13 Schneider Electric Industries Sas Vacuum cartridge for an electrical protection apparatus such as a switch or circuit breaker
WO2011006783A1 (de) * 2009-07-16 2011-01-20 Siemens Aktiengesellschaft Vakuumschaltröhre

Also Published As

Publication number Publication date
KR20000071457A (ko) 2000-11-25
TW445473B (en) 2001-07-11
EP1037233A3 (de) 2002-09-11
CN1267897A (zh) 2000-09-27
SG79304A1 (en) 2001-03-20
JP2000268684A (ja) 2000-09-29

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