EP3644463A1 - Zusammengebaute verbindungseinheit für funkenstrecke, die ein halteelement umfasst - Google Patents

Zusammengebaute verbindungseinheit für funkenstrecke, die ein halteelement umfasst Download PDF

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Publication number
EP3644463A1
EP3644463A1 EP18201741.8A EP18201741A EP3644463A1 EP 3644463 A1 EP3644463 A1 EP 3644463A1 EP 18201741 A EP18201741 A EP 18201741A EP 3644463 A1 EP3644463 A1 EP 3644463A1
Authority
EP
European Patent Office
Prior art keywords
holding
zone
electrode
connection assembly
conductive terminal
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.)
Pending
Application number
EP18201741.8A
Other languages
English (en)
French (fr)
Inventor
Boris Gautier
Julien DA-SILVA
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.)
ABB Schweiz AG
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
Priority to EP18201741.8A priority Critical patent/EP3644463A1/de
Publication of EP3644463A1 publication Critical patent/EP3644463A1/de
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/02—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
    • H01T4/14—Arcing horns

Definitions

  • the present invention relates to a connection assembly for a spark gap.
  • a protection device such as a spark gap intended to be disposed between a phase of an installation to be protected and the earth, the neutral and the earth, a phase and the neutral, or even between two phases in the case differential protection.
  • Such a spark gap comprises two connection assemblies.
  • Each connection assembly comprises an electrode and a conductive terminal cooperating with the corresponding electrode in a mounted position.
  • the two electrodes are arranged close so that an overvoltage above a certain threshold which is applied to the conductive terminals generates the formation of an electric arc.
  • each connection assembly may include means for connecting the electrode and the corresponding conductive terminal.
  • connecting means such as screws or a fixing by welding. This arrangement makes it possible to maintain cooperation between the electrode and the conductive terminal.
  • the screws can also by their geometry disturb the movement of the electric arc with a view to its extinction.
  • the weld connection is mechanically imprecise and the screw connection can be cumbersome, which is hardly compatible with mass production because assembly times can be long.
  • the present invention aims to solve all or part of the drawbacks mentioned above.
  • the present invention relates to a connection assembly for a spark gap comprising an electrode, a conductive terminal arranged to cooperate with the electrode in a mounted position and a holding element configured to hold the electrode and the conductive terminal in mounted position,
  • the holding element having a first contact holding zone extending transversely to a holding direction and a second contact holding zone extending transversely to the holding direction opposite the first contact holding zone, the first contact holding zone being configured to cooperate with the conductive terminal in the mounted position and the second contact holding zone being configured to cooperate with the electrode in the mounted position.
  • the holding element is arranged to prevent movement in the holding direction of the electrode relative to the conductive terminal.
  • the first holding zone constitutes a first stop and the second holding zone constitutes a second stop.
  • This arrangement thus makes it possible, by virtue of the holding element having two opposite holding zones, to maintain the mounted position without having to use welding and fasteners. There is a saving of assembly time during manufacture.
  • the electrode and the conductive terminal in the mounted position, have a first surface contact zone, a second remote surface contact zone and a separation zone arranged between the first surface contact zone and the second surface contact zone, a free space being provided between the electrode and the conductive terminal in the separation zone.
  • the electrode and the conductive terminal are arranged so that a current passing through the electrode and the conductive terminal has an orientation substantially parallel to the holding direction when passing through the first zone. of surface contact and in the second surface contact zone.
  • the current has an orientation substantially transverse to the holding direction between the first surface contact area. and the second surface contact area.
  • part of the current passes through the electrode and another part of the current passes through the conductive terminal. Said parts of the current therefore have an orientation parallel to each other.
  • This arrangement thus means that the flow of current generates in the mounted position generates an attraction of the electrode and of the conductive terminal at the level of the separation zone and a repulsion at the level of the first surface contact zone and of the second zone of surface contact according to the direction of maintenance.
  • the free space is provided in the conductive terminal and / or in the electrode.
  • the sum of the areas of the first surface cooperation area and of the second surface cooperation area is less than or equal to the area of the separation area transversely to the holding direction.
  • This arrangement means that the attraction forces compensate for the repulsion forces due to the passage of a current between the electrode and the conductive terminal.
  • the attractive forces can also be greater than the repulsive forces, which contributes to maintaining the mounted position when a current flows through the connection assembly.
  • the first surface contact zone extends along a first plane and the second surface contact zone extends along a second plane, the first plane and the second plane being parallel or coincident.
  • the arrangement opposite the two holding zones as well as the relative arrangement of the first plane with respect to the second plane allows a slight displacement of the conductive terminal relative to the electrode in the mounted position.
  • This characteristic is useful since it is imperative not to move the electrode under penalty of modifying the ignition voltage of an electric arc clinging to the electrode.
  • the free space in the mounted position, is at least partially disposed between the first contact holding zone and the second contact holding zone in the holding direction.
  • the separation zone is surrounded by the first surface contact zone and the second surface contact zone transversely to the holding direction and between the first contact holding zone and the second contact holding zone in the direction of maintenance.
  • This central position of the separation zone allows a distribution of the forces when a force oriented in the holding direction aims to distance the electrode and the conductive terminal.
  • the first surface contact zone, the separation zone and the second surface contact zone are aligned in a direction of cooperation transverse to the holding direction.
  • This arrangement allows the passage of a current on the one hand transversely to the direction of cooperation in the first surface contact zone and in the second surface contact zone and on the other hand longitudinally to the direction of cooperation in the electrode and the conductive terminal around the separation zone.
  • the relative orientation of the holding direction and of the cooperation direction makes it possible to improve the combined effect of the holding element and the attraction of the electrode and of the conductive terminal due to the presence of the zone. of seperation.
  • the separation zone has a length in the direction of cooperation between the first surface contact zone and the second surface contact zone and a height between the electrode and the conductive terminal in the holding direction , the height being shorter than the length.
  • the length is the minimum distance between the first surface contact zone and the second surface contact zone and the height the maximum distance between the electrode and the conductive terminal.
  • This arrangement allows the generation of a force aiming to bring the electrode and the conductive zone closer to the level of the separation zone because the electrode is close to the conductive terminal over a considerable length relative to the height.
  • the length is at least five times greater than the height.
  • the first contact holding zone is substantially centered or is centered with respect to the length in the direction of cooperation.
  • the first contact holding zone is substantially in the middle or is in the middle of the length.
  • This arrangement improves the maintenance in position, the forces being also distributed.
  • the holding element comprises a first lateral holding portion and a second lateral holding portion which are arranged to hold the electrode and the conductive terminal in the mounted position in a direction transverse to the direction of maintenance.
  • This arrangement prevents any relative displacement of the electrode and of the conductive terminal in the mounted position in the transverse direction. Such displacement could be caused in the event of a current passing causing the appearance of forces of attraction and repulsion oriented in the direction of maintenance.
  • the presence of the first lateral holding portion and the second lateral holding portion therefore makes it possible to improve the efficiency of the holding element.
  • the first surface contact zone, the separation zone and the second surface contact zone are arranged between the first lateral support portion and the second lateral support portion in the transverse direction.
  • This arrangement allows a good distribution of the holding forces in the transverse direction.
  • the direction of cooperation is oriented transversely to the transverse direction.
  • the holding element comprises a first transverse portion in which the first contact holding zone is formed and a second transverse portion in which the second contact holding zone is formed, the first lateral support being linked to the second lateral support portion on the one hand by the first transverse portion and on the other hand by the second transverse portion.
  • This arrangement allows easy manufacture of the holding element since its constitution is simple.
  • the first lateral holding portion, the second lateral holding portion, the first transverse portion and the second transverse portion are produced in a single piece. This arrangement also facilitates the construction of the holding element.
  • the holding element comprises a guide portion configured to guide an electric arc from the electrode to a deionization chamber of the spark gap.
  • connection assembly facilitates the manufacture of the connection assembly. Indeed, by including the guide portion to the holding element, one piece is used instead of two.
  • the first lateral holding portion, the second lateral holding portion, the first transverse portion, the second transverse portion and the guide portion are produced in a single piece.
  • the holding element is symmetrical with respect to a central plane of symmetry, the plane of symmetry passing through the first surface contact zone and the second surface contact zone.
  • the first lateral holding portion is symmetrical with respect to the second lateral holding portion with respect to the central plane of symmetry.
  • the holding element is obtained by folding a flat piece.
  • the holding element is produced easily and inexpensively.
  • the flat part is obtained from a cut sheet. This arrangement allows mass production of the holding element at a reduced cost.
  • the folding of the flat part corresponds to a first folding in a first direction of a first portion of the holding element and a second folding in a second direction of a second portion of the holding element.
  • This arrangement facilitates manufacture since the number of folds to be produced is limited.
  • the electrode comprises a refractory metal, preferably an alloy based on tungsten or another metal having similar properties.
  • This arrangement makes it possible to prevent the high temperatures at the foot of the electric arc from damaging the electrode.
  • a metal which has a high melting temperature.
  • the conductive terminal comprises an electrically conductive metal such as copper or a metal having similar conductivity characteristics.
  • This arrangement makes it possible to limit the cost of the connection assembly since the size of the electrode can be reduced and that of the conductive terminal increased.
  • the holding element is metallic.
  • the retaining element comprises a metal with high elastic limit such as steel, stainless steel or a copper alloy with high elastic limit.
  • This arrangement makes it possible to guide the electric arc formed towards the guide portion and therefore towards the deionization chamber in order to limit the current on.
  • the first contact holding zone is formed on a convex part of the first transverse portion.
  • the convex part is convex and in particular the convex part has a convex profile extending in the transverse direction.
  • This arrangement allows good maintenance by contact of the electrode and of the conductive terminal in the mounted position.
  • the first lateral holding portion and the second lateral holding portion are parallel or are oriented relative to one another at an angle of less than 5 °.
  • the present invention also relates to a spark gap comprising two connection assemblies as described above respectively called first connection assembly and second connection assembly, the spark gap further comprising an insulating protection arranged to cooperate with the first connection assembly and the second connection assembly so that an overvoltage beyond a threshold applied between the conductive terminal of the first connection assembly and the conductive terminal of the second connection assembly generates an electric arc between the electrode of the first connection assembly connection and the electrode of the second connection assembly.
  • a particular minimum distance is defined between the electrode of the first connection assembly and the electrode of the second connection assembly.
  • This arrangement makes it possible to define the voltage threshold beyond which an electric arc is established between said electrodes.
  • a space separating the electrodes is provided in the spark gap, said space comprising air or a gas in which an electric arc is capable of forming.
  • the spark gap comprises a deionization chamber disposed between at least part of the guide portion of the first connection assembly and at least part of the guide portion of the second connection assembly.
  • the deionization chamber comprises a plurality of aligned plates configured so that a small electric arc is formed between two adjacent plates.
  • This arrangement makes it possible to interrupt the current immediately after the electric arc between the electrodes has formed.
  • a connection assembly 1 comprises an electrode 3, a conductive terminal 5 and a holding element 7.
  • the holding element 7 is arranged to hold the electrode 3 and the conductive terminal 5 in a position mounted as illustrated Figures 1 to 6 .
  • the electrode 3 comprises a refractory metal and more particularly a tungsten-based alloy.
  • the conductive terminal 5 comprises an electrically conductive metal such as copper and the holding element 7 comprises a metal with high elastic limit such as steel, stainless steel or a copper alloy with high elastic limit.
  • the holding element 7 has a certain elasticity so that it can be mounted on the electrode 3 and the conductive terminal 5.
  • the holding element 7 has a first contact holding zone 9 extending transversely to a holding direction 11 and a second contact holding zone 13 extending transversely to the holding direction 11.
  • the first contact holding zone 9 faces the second contact holding zone 13 in the holding direction 11.
  • the first contact holding zone 9 is configured to cooperate with the conductive terminal 5 in the mounted position and the second contact holding zone 13 is configured to cooperate with the electrode 3 in the mounted position.
  • the first contact holding zone 9 is formed on a convex part 15 of a first transverse portion 17 of the holding element 7.
  • the convex part 15 has a convex profile extending in a direction transverse to the direction holding 11.
  • the second contact holding zone 13 is formed on a second transverse portion 21 and is substantially planar.
  • the first transverse portion 17 and the second transverse portion 21 extend parallel or substantially parallel at an angle of less than 5 °.
  • the first contact holding zone 9 and the second contact holding zone 13 are arranged to prevent displacement in the holding direction 11 of the electrode 3 and of the conductive terminal 5.
  • the electrode 3 and the conductive terminal 5 have a first surface contact zone 23, a second remote surface contact zone 25 and a separation zone 27 arranged between the first surface contact zone 23 and the second surface contact zone 25 .
  • a free space 29 is provided between the electrode 3 and the conductive terminal 5 in the separation zone 27.
  • the first surface contact zone 23, the separation zone 27 and the second surface contact zone 25 are aligned in a direction of cooperation 31.
  • the direction of cooperation 31 is both transverse to the holding direction 11 and to the transverse direction 19.
  • the first surface contact zone 23 extends along a first plane 33 and the second surface contact zone 25 extends along a second plane 35.
  • the first plane 33 and the second plane 35 are coincident or parallel so as to allow a slight relative movement of the electrode 3 and of the conductive terminal 5 in the direction of cooperation 31 while remaining in the mounted position.
  • the sum of the areas of the first surface cooperation zone 23 and of the second surface cooperation zone 25 is less than or equal to the area of the separation zone 27 transversely to the holding direction 11.
  • the free space 29 is at least partially disposed between the first contact holding zone 9 and the second contact holding zone 13 in the holding direction 11.
  • the free space 29 is provided in the electrode 3 and / or in the conductive terminal 5.
  • the separation zone 27 has a length L in the direction of cooperation 31 between the first surface contact zone 23 and the second surface contact zone 25 and a height H between the electrode 3 and the conductive terminal 5 in the holding direction 11.
  • the length L is the minimum distance between the first surface contact zone 23 and the second surface contact zone 25 and the height H is the maximum distance between the electrode 3 and the conductive terminal 5.
  • the height H is shorter than the length L and preferably the length L is at least five times longer than the height H.
  • the retaining element 7 can optionally include a first lateral retaining portion 37 and a second lateral retaining portion 39 arranged to keep the electrode 3 and the conductive terminal 5 in the mounted position in the transverse direction 19.
  • the first lateral holding portion 37 and the second lateral holding portion 39 are arranged around the first surface contact zone 23, the second surface contact zone 25 and the separation zone 27 in the transverse direction 19.
  • the first lateral holding portion 37 and the second lateral holding portion 39 are linked by the first transverse portion 17 on the one hand and the second transverse portion 21 on the other hand.
  • the retaining element 7 comprises a guide portion 41 configured to guide an electric arc from the electrode 3 to a deionization chamber 43.
  • the holding element 7 is made in a single piece from a folded flat piece.
  • the flat part is a previously cut sheet.
  • the holding element 7 also has a central plane of symmetry 49 passing through the first transverse portion 17 and the second transverse portion 21.
  • a spark gap 51 comprises two connection assemblies 1 as described above respectively called first connection assembly 1a and second connection assembly 1b.
  • the spark gap 51 may include an insulating protection 53 arranged to cooperate with the first connection assembly 1a and the second connection assembly 1b.
  • the insulating protection 53 is flexible and is configured to maintain an electric arc inside the deionization chamber 43.
  • a particular minimum distance 55 is defined between the electrode 3 of the first connection assembly 1a and the electrode of the second connection assembly 1b.
  • a space 57 separating the electrodes 3 is formed in the spark gap 51, said space 57 comprising air or a gas in which an electric arc is capable of forming.
  • the spark gap 57 comprises the deionization chamber 43 disposed between at least a portion of the guide portion 41 of the first connection assembly 1a and at least a portion of the guide portion 41 of the second connection assembly 1b.
  • the deionization chamber 43 comprises a plurality of aligned plates 59 configured so that a small electric arc is formed between two adjacent plates 59.
  • first contact holding zone 9 and the second contact holding zone 13 are in the middle of the surface contact zones 23, 25 transversely to the holding direction 19 allows a balance of forces. This arrangement improves maintenance in the mounted position.

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  • Spark Plugs (AREA)
EP18201741.8A 2018-10-22 2018-10-22 Zusammengebaute verbindungseinheit für funkenstrecke, die ein halteelement umfasst Pending EP3644463A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18201741.8A EP3644463A1 (de) 2018-10-22 2018-10-22 Zusammengebaute verbindungseinheit für funkenstrecke, die ein halteelement umfasst

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18201741.8A EP3644463A1 (de) 2018-10-22 2018-10-22 Zusammengebaute verbindungseinheit für funkenstrecke, die ein halteelement umfasst

Publications (1)

Publication Number Publication Date
EP3644463A1 true EP3644463A1 (de) 2020-04-29

Family

ID=63965242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18201741.8A Pending EP3644463A1 (de) 2018-10-22 2018-10-22 Zusammengebaute verbindungseinheit für funkenstrecke, die ein halteelement umfasst

Country Status (1)

Country Link
EP (1) EP3644463A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69828861T2 (de) * 1997-11-12 2006-04-27 Soule Protection Surtensions Funkenstreckenvorrichtung zum Schutz von elektrischen Leitungen und/oder elektrischen Apparaten gegen zeitlichen Überspannungen
JP2009283391A (ja) * 2008-05-26 2009-12-03 Kyocera Corp 接続構造
DE102010008536A1 (de) * 2010-02-18 2011-08-18 Phoenix Contact GmbH & Co. KG, 32825 Elektrische Anschlusseinrichtung
DE102014207714A1 (de) * 2014-04-24 2015-10-29 Te Connectivity Germany Gmbh Kontaktanordnung mit ein Formgehemme bildenden Kontaktelementen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69828861T2 (de) * 1997-11-12 2006-04-27 Soule Protection Surtensions Funkenstreckenvorrichtung zum Schutz von elektrischen Leitungen und/oder elektrischen Apparaten gegen zeitlichen Überspannungen
JP2009283391A (ja) * 2008-05-26 2009-12-03 Kyocera Corp 接続構造
DE102010008536A1 (de) * 2010-02-18 2011-08-18 Phoenix Contact GmbH & Co. KG, 32825 Elektrische Anschlusseinrichtung
DE102014207714A1 (de) * 2014-04-24 2015-10-29 Te Connectivity Germany Gmbh Kontaktanordnung mit ein Formgehemme bildenden Kontaktelementen

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