EP3486934A1 - Unterbrechungspol für stromunterbrechungsgerät - Google Patents

Unterbrechungspol für stromunterbrechungsgerät Download PDF

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Publication number
EP3486934A1
EP3486934A1 EP18201680.8A EP18201680A EP3486934A1 EP 3486934 A1 EP3486934 A1 EP 3486934A1 EP 18201680 A EP18201680 A EP 18201680A EP 3486934 A1 EP3486934 A1 EP 3486934A1
Authority
EP
European Patent Office
Prior art keywords
cylindrical body
connector
vacuum
bulb
seal
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Withdrawn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
EP18201680.8A
Other languages
English (en)
French (fr)
Inventor
Jean-Michel Bonfils
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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 Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP3486934A1 publication Critical patent/EP3486934A1/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Withdrawn legal-status Critical Current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
    • 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
    • H01H2033/6623—Details relating to the encasing or the outside layers of the vacuum switch housings

Definitions

  • the present invention relates to a breaking pole for a high-voltage electrical switchgear, that is to say a device operating at a voltage greater than 1000V, this pole comprising a vacuum interrupter intended to cut a circuit electric.
  • the invention also relates to an electrical switching device comprising such a pole for at least one of its phases.
  • electrical switching device includes different types of electrical devices such as a switch, a circuit breaker, a contactor, a fuse switch, a disconnector, a recloser, etc.
  • a vacuum interrupter is a cutoff device which comprises a generally substantially cylindrical body containing a sealed chamber in which there are present two electrical contacts, one of which is movable so as to open and close an electrical circuit passing through these contacts.
  • the vacuum bulb is intended to be integrated inside an envelope (or shell) of a breaking pole of an electrical breaking device.
  • the two electrical contacts each located at one end of the bulb are electrically connected to respectively two electrical connectors of the pole, named for example high connector and low connector. These two connectors are fixed and one of the two connectors is connected to the movable contact by a flexible or slippery conductor.
  • a vacuum interrupter must withstand significant dielectric stresses. Indeed, when the contacts of the vacuum bulb are open, there is a strong potential difference between the top and bottom connectors of the pole and therefore a significant risk of occurrence of an electric arc between them passing around the bulb. Also, to improve the electrical insulation around the bulb and particularly avoid the appearance of insulation problems between the top and bottom connectors of the same pole or between two adjacent poles of the same device, it is already known to completely overmold the cylindrical body of the ampoule with a layer usually made of epoxy material, as described in FIG. document EP2835812A1 . This avoids in particular that there is air between the outer walls of the body of the bulb and the envelope of the pole.
  • Another solution would be to not use ambient air but an insulating gas such as SF6 around the vacuum bulb to improve the dielectric performance. Nevertheless, it is necessary then to use a more complex shell because waterproof and equipped with bushings for current conductors. In addition, this solution is very unfavorable for the environment, with respect to pollution and the greenhouse effect, and complicates recycling.
  • the invention therefore aims to design a simple system, economical to avoid the dielectric stress around the vacuum bulb, and not having the various disadvantages mentioned above.
  • a breaking pole comprising an insulating envelope, a high connector and a low connector and a vacuum interrupter which is placed in the insulating envelope between the top connector and the bottom connector, the vacuum interrupter comprising a cylindrical body along a longitudinal axis and a transverse upper part, the cylindrical body housing a fixed contact and a movable contact electrically connected respectively with the top connector and the bottom connector.
  • the vacuum interrupter has a seal placed on the top and which is compressed against the envelope when the vacuum interrupter is attached to the top connector, so as to isolate the top connector and the fixed contact of the air located between the casing and the cylindrical body of the vacuum bottle and the seal corresponds to an end of an insulating sleeve surrounding the cylindrical body of the vacuum bulb.
  • the vacuum bottle comprises a top cover and a bottom cover closing the two ends of the cylindrical body, the upper part of the vacuum bottle being a flat part belonging to the cover.
  • the insulating sleeve is made of elastomeric material.
  • the seal is compressed against a transverse advance of the insulating envelope, which transverse advance is substantially parallel to the upper part, so as to compress the seal against two surfaces substantially perpendicular to the longitudinal axis.
  • the insulating sleeve comprises an inner wall which is covered with a conductive or semi-conductive paint applied in the vicinity of a junction between the top cover and the cylindrical body and in the vicinity of a junction between the bottom cover and the cylindrical body.
  • the insulating sleeve comprises a semiconductor screen which is overmolded inside the sleeve in the vicinity of a junction between the top cover and the cylindrical body and in the vicinity of a junction between the bottom cover and the cylindrical body.
  • the vacuum bulb is fixed to the top connector by means of a fixing screw.
  • the invention also relates to an electrical cutting apparatus comprising such a breaking pole for at least one of its phases.
  • a vacuum interrupter 10 has a substantially cylindrical body containing a sealed break chamber 13 in which the vacuum prevails, that is to say a very low controlled pressure of air or another gas.
  • the body of the bulb 10 is formed by a wall 15 of cylindrical shape along a longitudinal axis X and which is closed at both ends by two metal covers, referred to herein as the top cover 16 and the bottom cover 17.
  • the cylindrical wall 15 is made of a dielectric material, preferably ceramic, and the two metal covers 16, 17 are sealingly attached to the cylindrical body 15, for example by brazing or welding.
  • the body of the bulb 10 has a transverse upper portion 16a which is preferably substantially flat and perpendicular to the longitudinal axis X.
  • This upper portion 16a corresponds for example to an outer portion of the top cover 16.
  • the lid 16 may additionally have other shapes on another portion, such as for example a V-shape shown in the figures to better withstand the pressure difference between the inside and the outside of the vacuum bottle 10 .
  • the breaking chamber 13 comprises two electrical contacts 11, 12 which are relatively movable to one another, so as to open or close an electrical circuit. These contacts 11 and 12 are only partially represented on the figure 2 , for the sake of simplification. Conventionally, one of the electrical contacts, called high contact 11, is fixed and passes through the top cover 16 while the other electrical contact, called low contact 12, is movable along the longitudinal axis X and passes through the bottom cover 17. To allow movement of the movable contact 12 while maintaining its sealing, the breaking chamber 13 usually comprises a sealing bellows, which is not shown in the figures for the sake of simplification.
  • each phase of a switchgear has such a breaking pole.
  • This breaking pole 1 comprises an insulating jacket 2, which is preferably made of thermoplastic or thermosetting material, for example epoxy, and which forms a substantially cylindrical housing 3 inside which the vacuum interrupter 10 is placed. high end, the housing 3 is delimited by a transverse advance 4 of the insulating envelope 2, that is to say substantially perpendicular to the longitudinal axis X.
  • the insulating envelope 2 also surrounds two metal connection arms 20, 22 of the breaking pole 1, typically an upstream connection arm 20 corresponding to an arrival of the electric current and a downstream connection arm 22 corresponding to a departure of the current.
  • the vacuum bottle 10 is electrically connected between the upstream connection arm 20 and the downstream connection arm 22, so as to open or close the electrical circuit passing through these two connection arms 20, 22.
  • the electrical connection between the fixed contact 11 of the bulb 10 and the upstream connecting arm 20 is made using a top connector 21 placed at the end of the upstream connecting arm 20 and which rests on the transverse advance 4.
  • This advanced 4 which separates the top connector 21 and the top cover 16 of the vacuum bottle 10, nevertheless has a central passage through which the top connector 21 passes to make the electrical connection between the upstream connection arm 20 and the fixed contact. 11.
  • the downstream connecting arm 22 is extended by a bottom connector 23 and the electrical connection between the movable contact 12 of the bulb 10 and the bottom connector 23 is formed by a known flexible type connection or a sliding contact.
  • the movable contact 12 is actuated via an opening / closing mechanism of the contacts, such as an insulating rod 24.
  • This mechanism for example a spring mechanism, are not detailed here.
  • the breaking pole 1 then comprises fastening means which allow one hand to fix the vacuum bulb 10 inside the insulating casing 2 while keeping the upper part of the bulb against the transverse advance 4 and on the other hand to establish a good electrical connection between the fixed contact 11 and the top connector 21.
  • the fixing means comprise a simple fixing screw 8, which can be introduced through a opening 7 of the casing 2 so as to fix the vacuum bottle 10 against the top connector 21.
  • the top contact 11 comprises for example an orifice 14 which makes it possible to introduce the fixing screw 8 to fix the vacuum bottle 10.
  • the vacuum bottle 10 further comprises a cylindrical insulating sleeve 19 (also sometimes called sock) which surrounds the cylindrical body 15 also covering at least partially the top and bottom covers 16, 17.
  • This sleeve is preferably made of elastomeric material, such as silicone or EPDM (ie Ethylene-Propylene-Diene Monomer), in order to give it sufficient elasticity to surround and remain plated against the vacuum bottle 10.
  • the insulating sleeve 19 has an inner wall 18 which is covered with a layer of conductive paint (for example a metallic paint) or semi-conductive paint (for example a silicone paint) in the vicinity of the top cover 16 and of the bottom cover 17, so as to locally form at each end of the bulb an equipotential screen to remove or strongly lower the dielectric stress at the triple points PT1, PT2 of the vacuum interrupter 10. More precisely, this layer of paint is applied on the one hand in the vicinity of the junction between the top cover 16 and the cylindrical body 15, and on the other hand in the vicinity of the junction between the bottom cover 17 and the cylindrical body 15.
  • a layer of conductive paint for example a metallic paint
  • semi-conductive paint for example a silicone paint
  • a triple point is formed by an edge located at the intersection of a conductive material (in this case the covers 16, 17) and two electrical insulating materials, one of which is generally a gas (in one embodiment). the air and the cylindrical body 15).
  • the conductive or semiconductive paint may be replaced by a semiconductor screen which is overmolded inside the sleeve 19, respectively in the vicinity of the top cover 16 and the bottom cover 17 of the bulb 10. More specifically, a first semiconductor screen is overmolded near the junction between the top cover 16 and the cylindrical body 15, and a second semiconductor screen is overmolded near the junction between the bottom cover 17 and the cylindrical body 15.
  • the invention provides that the insulating sleeve 19 projects over the upper part 16a transverse of the bulb 10 and has at its end a thickening 19a all around the circumference of the bulb 10, as indicated in FIG. figure 2 .
  • this thickening 19a has a thickness A of 10 mm when it is not compressed.
  • This seal 19a of the sleeve 19 is sealed and insulates dielectrically the conductive parts of the top of the bulb, in particular the top connector 21 and the fixed contact 11, of the air zone 3 located between the longitudinal inner wall 6 of the casing 2 and the cylindrical body 15 of the vacuum bottle 10.
  • the seal 19a is sufficiently compressed to expel air from the compressed zone, that is to say on the one hand between the seal 19a and the upper part 16a of the cover 16 and secondly between the seal 19a and the transverse advance 4 of the casing 2.
  • the compression of the seal 19a must take into account the expansion of the parts during temperature variations and the effects of compression set due to the aging of the parts. 20% compression of the seal Sealing 19a is for example sufficient for a range of operating temperature of the vacuum interrupter ranging from -40 ° C to + 100 ° C. For a temperature range of -25 ° C to + 70 ° C, a 15% compression of the seal 19a would be sufficient.
  • the upper portion 16a of the top cover 16 of the vacuum bottle 10 is flat and substantially parallel to the transverse advance 4 of the casing 2, so as to compress the seal 19a against two flat surfaces and substantially perpendicular to the longitudinal direction of the attachment movement of the bulb 10 in the pole 1, which provides a better efficiency in the compression of the seal 19a to ensure the desired seal.
  • the direction of attachment of the vacuum bulb is identical to the direction of compression of the seal, that is to say along the longitudinal axis X.
  • the invention therefore makes it possible to obtain a very simple means of avoiding arcing around the vacuum interrupter, thanks solely to an insulating sleeve of suitable shape.
  • a breaking pole 1 is easy to mount because it is not necessary to precisely center the vacuum bottle 10 in the housing 3 since the seal is on the upper transverse part of the bulb and not on the circular side walls 15.
  • the free air zone in the housing 3 also facilitates the assembly and disassembly of the vacuum bulb 10, for maintenance or recycling operations at the end of life.

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
EP18201680.8A 2017-11-16 2018-10-22 Unterbrechungspol für stromunterbrechungsgerät Withdrawn EP3486934A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1760801A FR3073663A1 (fr) 2017-11-16 2017-11-16 Pole de coupure pour appareil electrique de coupure

Publications (1)

Publication Number Publication Date
EP3486934A1 true EP3486934A1 (de) 2019-05-22

Family

ID=61258370

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18201680.8A Withdrawn EP3486934A1 (de) 2017-11-16 2018-10-22 Unterbrechungspol für stromunterbrechungsgerät

Country Status (2)

Country Link
EP (1) EP3486934A1 (de)
FR (1) FR3073663A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021018426A1 (de) * 2019-07-30 2021-02-04 Siemens Energy Global GmbH & Co. KG Unterbrechereinheit mit einer vakuumröhre und einem isoliergehäuse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4618749A (en) * 1984-09-24 1986-10-21 Veb Otto Buchwitz Starkstrom Anlagebau Dresden Solid insulator-type vacuum switch gear
DE19634451C1 (de) * 1996-08-26 1998-01-29 Driescher Eltech Werk Lastschalter
WO2000041199A1 (en) * 1999-01-06 2000-07-13 Nu-Lec Industries Pty Ltd Method for assembly of insulated housings for electrical equipment and incorporation of circuit interrupters therein
FR2808117A1 (fr) * 2000-03-31 2001-10-26 Schneider Electric Ind Sa Appareillage electrique de coupure comportant une ampoule a vide et une liaison electrique flexible
DE102006062225A1 (de) * 2006-12-22 2008-06-26 Decom Gmbh Isolationsgehäuse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4618749A (en) * 1984-09-24 1986-10-21 Veb Otto Buchwitz Starkstrom Anlagebau Dresden Solid insulator-type vacuum switch gear
DE19634451C1 (de) * 1996-08-26 1998-01-29 Driescher Eltech Werk Lastschalter
WO2000041199A1 (en) * 1999-01-06 2000-07-13 Nu-Lec Industries Pty Ltd Method for assembly of insulated housings for electrical equipment and incorporation of circuit interrupters therein
FR2808117A1 (fr) * 2000-03-31 2001-10-26 Schneider Electric Ind Sa Appareillage electrique de coupure comportant une ampoule a vide et une liaison electrique flexible
DE102006062225A1 (de) * 2006-12-22 2008-06-26 Decom Gmbh Isolationsgehäuse

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021018426A1 (de) * 2019-07-30 2021-02-04 Siemens Energy Global GmbH & Co. KG Unterbrechereinheit mit einer vakuumröhre und einem isoliergehäuse
CN114175201A (zh) * 2019-07-30 2022-03-11 西门子能源全球有限公司 具有真空管和绝缘壳体的中断单元
US11915895B2 (en) 2019-07-30 2024-02-27 Siemens Energy Global GmbH & Co. KG Interrupter unit having a vacuum tube and an insulating housing
CN114175201B (zh) * 2019-07-30 2024-03-08 西门子能源全球有限公司 具有真空管和绝缘壳体的中断单元

Also Published As

Publication number Publication date
FR3073663A1 (fr) 2019-05-17

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