EP0200465A2 - Vakuumvorrichtungen - Google Patents

Vakuumvorrichtungen Download PDF

Info

Publication number
EP0200465A2
EP0200465A2 EP86303052A EP86303052A EP0200465A2 EP 0200465 A2 EP0200465 A2 EP 0200465A2 EP 86303052 A EP86303052 A EP 86303052A EP 86303052 A EP86303052 A EP 86303052A EP 0200465 A2 EP0200465 A2 EP 0200465A2
Authority
EP
European Patent Office
Prior art keywords
envelope
vacuum device
wall
insulating
arcing
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Withdrawn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
EP86303052A
Other languages
English (en)
French (fr)
Inventor
Leslie Thomas Falkingham
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.)
VACUUM INTERRUPTERS Ltd
Original Assignee
VACUUM INTERRUPTERS 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 VACUUM INTERRUPTERS Ltd filed Critical VACUUM INTERRUPTERS Ltd
Publication of EP0200465A2 publication Critical patent/EP0200465A2/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Withdrawn legal-status Critical Current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
    • H01H33/662—Housings or protective screens
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations

Definitions

  • This invention relates to vacuum devices of the kind that have two separable contacts or spaced electrodes in an evacuated chamber formed by an envelope which is mainly of electrically insulating material for insulating the connections to one contact from those to the other. More particularly, the invention relates to vacuum switch devices such as vacuum interrupters, contactors or loadbreak switches, but is also applicable to other vacuum devices as will be apparent from the following description.
  • the invention provides a vacuum device of the kind described above wherein only a minor fraction of the length of the inner surface of the insulating wall of the envelope is shielded from the metal vapour produced on arcing.
  • the shielded region must, of course, form a continuous shielded area completely encircling the inner surface of the envelope but it has been found that insulation of the connections to the contacts or electrodes, as the case may be, from each other can be maintained even when the shielded length of the envelope is quite small.
  • the minimum length required to maintain the insulation will depend upon the particular device, and the voltages likely to be encountered in use, but may readily be found by trial.
  • a shield may be in the form of an annulus extending into the envelope for a short distance from the or each end, and may be in the form of a metal cylinder attached to a metal plate closing the respective end of the envelope, the cylinder being located closely adjacent the inner surface of the envelope.
  • a shield may be formed by an annular protuberance on the inner surface of the insulating wall.
  • a shield may consist of a ring, either of metal or electrically insulating material, extending inwards from the inner surface of the insulating wall; the ring may be formed as a separate member fixed to the wall or, if of insulating material, may be formed integrally with the wall.
  • At least one end of the insulating wall of the envelope projects into a cylindrical end member closed at its outer end, the end member being sealed to the outer surface of the insulating wall at a region spaced from the end thereof, and the projecting end part of the insulating wall being spaced from the end member.
  • the outer surface of the end part of the insulating wall is thereby shielded from metal vapour produced on arcing.
  • Figure 1 shows a vacuum circuit interrupter 10 and comprises a highly evacuated tubular envelope 12 formed from glass or ceramic material and a pair of metallic end caps 14 and 16 closing off the ends of the insulating envelope 12. Seal means 24 are provided between the end caps 14 and 16 and the insulating envelope to render the inside of the insulating envelope 12 to be under vacuum.
  • the pressure within the insulating envelope 12 under normal conditions is lower than 10 -4 torr to insure that the mean free path for electron travel will be longer than the potential breakdown path within the insulating envelope 12.
  • Located within the insulated envelope 12 are a pair of relatively movable contacts 18 and 20. When the contacts 18 and 20 are separated, there is formed an arcing gap 30 therebetween.
  • the lower contact 18 is a stationary contact secured to a conducting rod 32 by connecting means such as welding or brazing.
  • the conducting rod 32 is rigidly joined to the stationary end cap 14.
  • the upper contact 20 is a movable contact and is joined to a conductive operating red 34.
  • the operating rod 34 is mounted for movement along the longitudinal axis of the insulating envelope 12.
  • the operating rod 34 projects through an opening 36 in bellows end cap 16.
  • a metal bellows 38 is secured in sealing relationship at its respective opposite ends to the operating rods 34 and to the bellows end cap 36.
  • Flexible metallic bellows 38 provides a seal around the operating rod 34 to allow for movement of operating rod 34 without impairing the vacuum within the insulating envelope 12.
  • an actuating means (not shown) provided for driving the movable contact 20 into engagement with the stationary contact 18 so as to close the interrupter 10.
  • the actuating means is also capable of returning the movable contact 20 to the open circuit position during circuit interruption.
  • an arc 54 is formed in the arcing gap 30 between contacts 18 and 20.
  • the arc 54 which is formed between the contacts 18 and 20 vaporizes some of the contact material. These vapours and particles are dispersed from the arcing gap 30 towards the insulating envelope 12.
  • the internal insulating surfaces of the insulating envelope 12 are protected from the condensation of the arc generated metallic vapours and particles thereon by means of a tubular main metallic arc shield 40.
  • Main arc shield 40 is supported on the insulating envelope 12 and electrically isolated from end caps 14 and 16, but may be supported from or electrically connected to either end cap 14 or 16, if desired.
  • the shield 40 acts to intercept and to condense arc generated metallic vapours and particles before they can reach the insulating envelope 12.
  • end cap shields 42 and 44 are provided surrounding the ends of the main arc shield 40.
  • a cup-shaped shield 43 is attached to the movable operating rod 34 and partially surrounds the flexible metallic bellows 38 to prevent the bellows 38 from being bombarded by arc generated metallic vapours and particles.
  • the insulating envelope 12 only needs to be shielded over a small part of its surface provided that this shielded part extends right around the envelope. This can be achieved in many different ways of which only four are illustrated.
  • these projections are described as being integral with the envelope in the sense that the envelope is moulded with them in place, they may be attached to the envelope at a later stage and may be either non- metallic such as ceramic or may even be metallic.
  • the envelope may be moulded with a recess extending into the envelope from one end, the inner wall of the envelope then shielding the inside of the recess and thus providing the shielded band around the envelope.
  • the envelope 12 is slightly recessed so as to provide a shoulder 15 against which an annular ring 17 is fixed so as to shield the part of the envelope directly behind the ring in relation to the are.
  • the ring 17 may be either metallic or insulating, and in a modification may be simply an annular projection, of similar shape, integral with the envelope and extending inwards from the envelope wall.
  • the outer surface of the insulating envelope 12 is formed with a pair of annular steps 19 spaced from the respective ends of the envelope, and the metallic end caps 14, 16, are brazed to metal cylinders 21 which surround, and are spaced from, the thinner end parts 23 of the envelope extending beyond the steps 19.
  • the inner ends of the cylinders 21 are sealed to the steps 19 to close the ends of the envelope 12, and it will be seen that the outer surfaces of the end parts 23 of the envelope effectively provide annular shielded bands.
  • the invention is not restricted to the configurations described, and is also applicable to other forms of vacuum devices, such as triggered vacuum gaps, having an evacuated insulating envelope in which arcing takes place.

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
EP86303052A 1985-04-24 1986-04-23 Vakuumvorrichtungen Withdrawn EP0200465A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8510440 1985-04-24
GB858510440A GB8510440D0 (en) 1985-04-24 1985-04-24 Vacuum devices

Publications (1)

Publication Number Publication Date
EP0200465A2 true EP0200465A2 (de) 1986-11-05

Family

ID=10578128

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86303052A Withdrawn EP0200465A2 (de) 1985-04-24 1986-04-23 Vakuumvorrichtungen

Country Status (4)

Country Link
EP (1) EP0200465A2 (de)
JP (1) JPS61288332A (de)
GB (2) GB8510440D0 (de)
ZA (1) ZA863060B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0563830A1 (de) * 1992-03-31 1993-10-06 Siemens Aktiengesellschaft Vakuumschaltrohr für Nieder- und Mittelspannungsschalter, insbesondere für Vakuumschütze
EP0911847A1 (de) * 1997-10-22 1999-04-28 Eaton Corporation Dampfschild für Vakuumschalter
WO1999038181A1 (de) * 1998-01-21 1999-07-29 Siemens Aktiengesellschaft Vakuumschaltkammer mit ringförmigem isolator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4672156A (en) * 1986-04-04 1987-06-09 Westinghouse Electric Corp. Vacuum interrupter with bellows shield
DE3717864A1 (de) * 1987-05-26 1988-11-17 Slamecka Ernst Vakuumschalter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6806935U (de) * 1968-11-14 1969-03-06 Siemens Ag Isolierstoffgehaeuse fuer vakuumschalter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0563830A1 (de) * 1992-03-31 1993-10-06 Siemens Aktiengesellschaft Vakuumschaltrohr für Nieder- und Mittelspannungsschalter, insbesondere für Vakuumschütze
EP0911847A1 (de) * 1997-10-22 1999-04-28 Eaton Corporation Dampfschild für Vakuumschalter
KR100576398B1 (ko) * 1997-10-22 2006-08-30 이턴 코포레이션 진공차단기용증기차폐기
WO1999038181A1 (de) * 1998-01-21 1999-07-29 Siemens Aktiengesellschaft Vakuumschaltkammer mit ringförmigem isolator
US6417472B1 (en) 1998-01-21 2002-07-09 Siemens Aktiengesellschaft Vacuum switching chamber having an annular insulator

Also Published As

Publication number Publication date
GB2174550A (en) 1986-11-05
GB8510440D0 (en) 1985-05-30
GB8609930D0 (en) 1986-05-29
ZA863060B (en) 1986-12-30
JPS61288332A (ja) 1986-12-18

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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Designated state(s): CH DE FR IT LI NL

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18W Application withdrawn

Withdrawal date: 19870402

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FALKINGHAM, LESLIE THOMAS