EP3796353A1 - Kontaktanordnung - Google Patents

Kontaktanordnung Download PDF

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Publication number
EP3796353A1
EP3796353A1 EP19198641.3A EP19198641A EP3796353A1 EP 3796353 A1 EP3796353 A1 EP 3796353A1 EP 19198641 A EP19198641 A EP 19198641A EP 3796353 A1 EP3796353 A1 EP 3796353A1
Authority
EP
European Patent Office
Prior art keywords
contact
bottom portion
tube
tube contact
pin
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Withdrawn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
EP19198641.3A
Other languages
English (en)
French (fr)
Inventor
Tammaraya Bagale
Subodh Kale
Nakul Marathe
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.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens Energy Global GmbH and Co KG
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 Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Priority to EP19198641.3A priority Critical patent/EP3796353A1/de
Priority to BR112022002622A priority patent/BR112022002622A2/pt
Priority to CN202080065782.0A priority patent/CN114424312B/zh
Priority to PCT/EP2020/075750 priority patent/WO2021052950A1/en
Publication of EP3796353A1 publication Critical patent/EP3796353A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts
    • H01H1/385—Contact arrangements for high voltage gas blast circuit breakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • 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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts

Definitions

  • Embodiments of the present disclosure generally relates to contact arrangement and contact arrangement for circuit breakers.
  • a circuit breaker 100 includes three pole columns, 101a, 101b and 101c, resting on a common breaker base 102, as illustrated by FIG. 1 .
  • the three pole columns are connected by tubes to a gas compartment 103.
  • the circuit breaker has an interrupter unit 104 and a connecting mechanism.
  • the interrupter unit 104 has 2 parts, the main contact and the arcing contact.
  • the tube contact must apply enough pressure to hold the pin contact with sufficient force.
  • the bottom portion of the tube contact is made of CuCrZr material, which results in a problem that the tube contact loses its mechanical properties at elevated temperature. Further, the stiffness of the bottom portion should be sufficient enough to hold the pin contact intact.
  • the object is achieved by a tube contact configured for receiving the pin contact, the tube contact comprising a top portion configured for establishing an arc with the pin contact and a bottom portion extending from the top portion in a substantially longitudinal direction of the tube contact, characterized in, that the bottom portion is a high strength portion made of a material having a Young's modulus of 190 GPa to 220 GPa.
  • the tube contact exhibits improved mechanical properties at elevated temperature for a low cost as compared to known contact elements for circuit breakers.
  • the tube contact develop a force supplementary to hold the pin contact in place when a top portion of the pin contact engages with the tube contact during a short circuit.
  • the bottom portion of the tube contact is made of a material comprising at least steel.
  • the bottom portion of the tube contact is made of a material comprising at least a steel alloy having a carbon content of at least 0.002wt%-2.1325wt%.
  • the properties of steel and steel alloys such as high electrical conductivity, thermal conductivity, high reaction resistance, high melting point and low material and processing cost, makes steel and steel alloys an ideal material for making contact elements.
  • a stiffness of the bottom portion is directly proportional to the Young's modulus of the material. This makes it possible to reduce the force exerted by the tube contact on the pin contact to obtain a required contact pressure to withstand a short circuit current.
  • the object is achieved by a contact arrangement comprising a tube contact and a pin contact.
  • the bottom portion of the pin contact is made of a high strength material, such as a steel or steel alloy having a carbon content of at least 0.002wt%-2.1325wt% and having a Young's modulus of 190 GPa to 220 GPa.
  • a high strength material such as a steel or steel alloy having a carbon content of at least 0.002wt%-2.1325wt% and having a Young's modulus of 190 GPa to 220 GPa.
  • the object is achieved by a circuit breaker comprising the tube contact and the contact arrangement.
  • FIG 3 is a cross-sectional view of the tube contact 300, according to the present invention.
  • the tube contact 300 comprises a top portion 301 and a bottom portion 302.
  • the bottom portion 302 extends from the top portion 301 in a substantially longitudinal direction of the tube contact 300.
  • the top portion 301 may be made of, for example, a Tungsten-Copper, WCu material, having a weight range of WCu 90/10, WCu 85/15, WCu 80/20, WCu 75/25, WCu 70/30, WCu 65/35, WCu 60/40, WCu 55/45, WCu 50/50, a Silver Nickel (AgNi)material or Sivler Tungsten (AgW), thereby combining a high melting point and arc erosion resistance of tungsten with the low melting point and good electrical conductivity of copper or the high conductivity of silver.
  • the bottom portion 302 is made of a material having a Young's modulus of 190 GPa to 220 GPa. The selection of the material having a Young's modulus in the defined range makes the bottom section a high-strength portion.
  • the top portion 301 and bottom portion 302 is joined by welding/brazing.
  • E the Modulus of elasticity of the material
  • P the force exerted in N
  • L the span (length) of force to be applied by the tube contact on the pin contact in mm
  • I the moment of inertia in mm 3
  • ⁇ l the deflection in mm.
  • Young's modulus is a mechanical property of a material that measures the ability of a material to withstand changes in length when a tension or compression in applied along a length of the material.
  • the bottom portion 302 or the high-strength portion is made of steel or steel alloys.
  • the steel alloy contains, for example, at least one of the components of Aluminium from 0.1wt% to 2.25wt%, Chromium from 0.5wt% to 18wt%,Copper from 0.1wt% to 0.4wt%,Manganese from 0.25wt% to 13wt%, Molybdenum from 0.25wt% to 5wt%, Nickel 0.2wt%-20wt%, Silicon 0.2wt%-2wt%,Carbon 0.002wt%-2.14wt%,Sulphur 0.08wt%-0.15wt%, Titanium 0.25wt%-2.60wt%, Vanadium 0.10wt%-1.50wt%.
  • the steel alloy may comprise a very less percentage of Boron, Cobalt, Niobium, Nitrogen, Phosphorus, Zirconium and other elements. The aforementioned %weight may vary according to
  • the required tensile strength can be provided.
  • the tensile strength of the bottom portion 302 may be ranging, for instance, from 470MPa to 630Mpa.
  • the steel alloys are highly formable, which reduces the impact of the tube contact 300 with the corresponding pin contact (plug) during high speed closing operation of the circuit breaker.
  • the application of the steel alloys in the tube contact 300 according to the embodiments described herein causes only minimal contact erosion.
  • the tube contact 300 is configured for applications with increased closing speeds and high voltage conditions.
  • FIG 4 is a cross sectional view of contact arrangement 400 according to the present invention.
  • the contact arrangement 400 comprises the tube contact 300 and a pin contact 401.
  • the tube contact 300 is configured for receiving the pin contact 401, which acts as a plug when the contacts close.
  • the tube contact 300 comprises a top portion 301 and a bottom portion 302 for receiving the corresponding plug.
  • the pin contact 401 comprises a top portion 402 and a bottom portion 403.
  • the bottom portion 403 of the pin contact 401 may be made of steel or steel alloy having a Young's modulus of 190 GPa to 220 GPa, where the steel alloy have a carbon content of at least 0.002wt%-2.1325wt%.
  • the tube contact 300 and the pin contact 401 are movable relative to each other along the longitudinal axis 303 of the tube contact 300 to establish or interrupt an electrical (and mechanical) contact.
  • the force exerted by the tube contact 300 on the pin contact 401 to obtain contact pressure required for receiving the top portion 402 of the pin contact 401 during a normal breaker closed condition is calculated as, P N : 3 * Es * I * ⁇ s / l ⁇ 3 ;
  • Es is the permissible modulus of elasticity of steel
  • I is the moment of inertia
  • ⁇ s is the maximum deformation obtained on the bottom portion 302
  • 1 is the length of a cantilever beam from which the force is applied.
  • the bottom portion 302 of the tube contact 300 is designed in a way to increase the stiffness of the bottom portion 302 along a longitudinal direction, so as to hold the pin contact 401 during the closing operation when the pin contact 401 moves inside the tube contact 300.
  • the increase in stiffness of the bottom portion 302 is achieved by selecting a material, such as steel, or any steel alloy having the Young's modulus within the range of 190GPa to 220Gpa.
  • FIG 5 is a schematic diagram illustrating a circuit breaker 100 with the contact arrangement 400 according to the present invention.
  • the contact arrangement 400 comprises a tube contact 300 adapted to be employed in the circuit breaker 100 and configured for receiving a corresponding pin contact 401 during a closing operation.
  • the circuit breaker 100 herein is a high-voltage circuit breaker.
  • the tube contact 300 and the pin contact 401 is adapted for connecting current paths, carry the current in a closed position, to interrupt current during an arc interrupt and to isolate current paths from each other during high voltage operation of the circuit breaker
  • the kinetic energy is introduced into the contact elements, e.g. the tube contact 300 and/or the corresponding pin contact 401.
  • the tube contact 300 is subjected to high mechanical stress.
  • the tube contact 300 is configured to deflect when it form contact with the corresponding pin contact 401.
  • the tube contact do not deform or break upon high speed closing operations.
  • the contact pressure between the tube contact 300 and the pin 400 can be assured.
  • FIG 6 is a graph showing a variation of modulus of elasticity with respect to stiffness of the bottom portion according to an embodiment of the present invention.
  • the stiffness of the material depends upon the young modulus of material and also varies with loading condition, shape and size. As Young's modulus of a material increases, the stiffness of the material also increases. When the stiffness increases, the contact force to be exerted by the tube contact on the pin contact also increases. So in order to hold the pin contact, when the pin contact plugs with the tube contact during closing operation of the circuit breaker, thickness of the bottom portion is reduced according to the present invention.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)
  • Breakers (AREA)
EP19198641.3A 2019-09-20 2019-09-20 Kontaktanordnung Withdrawn EP3796353A1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP19198641.3A EP3796353A1 (de) 2019-09-20 2019-09-20 Kontaktanordnung
BR112022002622A BR112022002622A2 (pt) 2019-09-20 2020-09-15 Dispositivo de contato
CN202080065782.0A CN114424312B (zh) 2019-09-20 2020-09-15 触头装置
PCT/EP2020/075750 WO2021052950A1 (en) 2019-09-20 2020-09-15 Contact arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19198641.3A EP3796353A1 (de) 2019-09-20 2019-09-20 Kontaktanordnung

Publications (1)

Publication Number Publication Date
EP3796353A1 true EP3796353A1 (de) 2021-03-24

Family

ID=67998323

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19198641.3A Withdrawn EP3796353A1 (de) 2019-09-20 2019-09-20 Kontaktanordnung

Country Status (4)

Country Link
EP (1) EP3796353A1 (de)
CN (1) CN114424312B (de)
BR (1) BR112022002622A2 (de)
WO (1) WO2021052950A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19837945A1 (de) * 1998-08-21 2000-02-24 Asea Brown Boveri Schaltanordnung und Verfahren zu ihrer Herstellung
EP2797095A1 (de) 2013-04-22 2014-10-29 ABB Technology AG Tulpenkontakt für einen Leistungsschalter
US20140360984A1 (en) * 2013-06-05 2014-12-11 Hitachi, Ltd. Gas insulated switchgear

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2057344A5 (de) * 1969-08-12 1971-05-21 Merlin Gerin
AT13815U3 (de) * 2014-02-21 2015-05-15 Plansee Powertech Ag Kontaktstift und Rohrkontakt sowie Verfahren zur Herstellung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19837945A1 (de) * 1998-08-21 2000-02-24 Asea Brown Boveri Schaltanordnung und Verfahren zu ihrer Herstellung
EP2797095A1 (de) 2013-04-22 2014-10-29 ABB Technology AG Tulpenkontakt für einen Leistungsschalter
US20140360984A1 (en) * 2013-06-05 2014-12-11 Hitachi, Ltd. Gas insulated switchgear

Also Published As

Publication number Publication date
CN114424312A (zh) 2022-04-29
BR112022002622A2 (pt) 2022-08-09
WO2021052950A1 (en) 2021-03-25
CN114424312B (zh) 2024-04-12

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