EP3951819A1 - Feldabstufungselektrode - Google Patents

Feldabstufungselektrode Download PDF

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Publication number
EP3951819A1
EP3951819A1 EP20189418.5A EP20189418A EP3951819A1 EP 3951819 A1 EP3951819 A1 EP 3951819A1 EP 20189418 A EP20189418 A EP 20189418A EP 3951819 A1 EP3951819 A1 EP 3951819A1
Authority
EP
European Patent Office
Prior art keywords
field grading
grading electrode
elastomer
thermoplastic
conductor
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
EP20189418.5A
Other languages
English (en)
French (fr)
Inventor
Michael Kessler
Robby Zitzmann
Mohammad NAZEMI
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 EP20189418.5A priority Critical patent/EP3951819A1/de
Publication of EP3951819A1 publication Critical patent/EP3951819A1/de
Pending 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
    • H01H33/02—Details
    • H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/64—Protective enclosures, baffle plates, or screens for contacts
    • 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

Definitions

  • the present invention relates to a field grading electrode for a low, medium voltage or high switchgear, a conductor for a low, medium or voltage switchgear with field grading protection, and a method of field grading protecting a conductor for a low, medium or high voltage switchgear.
  • Field grading electrode in low voltage (LV), medium voltage (MV) and high voltage (HV) switchgears are used to homogenize the electrical field within the switchgear, such as across insulating gas distances.
  • the field grading electrodes reduce the maximum field strength in areas of sharp edges or tips, which could otherwise lead to a flashover under operation. By using such field grading electrodes it is possible to reduce insulations distances leading to a significant more compact design.
  • Field grading electrodes consists of electrically conductive materials to be able to influence the electrical field. Usually metallic materials such as Aluminum or Copper are used for this task.
  • a field grading electrode for a low, medium or high voltage switchgear.
  • the field grading electrode is configured to be assembled to a conductor of a low, medium or high voltage switchgear.
  • the field grading electrode comprises an elastomer or thermoplastic.
  • the field grading electrode is conductive or semiconductive.
  • At least one portion of the elastomer or thermoplastic is flexible.
  • At least one portion of the elastomer or thermoplastic is resilient.
  • the at least one portion of the elastomer or thermoplastic that is flexible is resilient.
  • a portion of the elastomer or thermoplastic comprises a large radius for field grading.
  • the portion of the elastomer or thermoplastic that comprises a large radius is different to the at least one portion that is flexible and/or is different to the at least one portion that is resilient.
  • the field grading electrode comprises a single piece of elastomer or thermoplastic.
  • the elastomer or thermoplastic is a conductive elastomer or conductive thermoplastic.
  • the elastomer or thermoplastic comprises one or more conductive outer layers.
  • the field grading electrode is configured to be slid onto an end of the conductor.
  • the field grading electrode is configured to be inserted into an end of the conductor.
  • the field grading electrode comprises silicone.
  • the field grading electrode comprises ethylene-propylene-diene (EPDM) elastomer.
  • EPDM ethylene-propylene-diene
  • the field grading electrode once assembled to the conductor can move on the conductor.
  • a switch system for a low, medium or high voltage switchgear comprising:
  • At least a part of the field grading electrode is configured to deform elastically during switching operation.
  • the field grading electrode is configured to withstand piercing and/or sparking during switching operation.
  • a conductor for a low, medium or high voltage switchgear with field grading protection A field grading electrode is assembled to the conductor.
  • the field grading electrode comprises an elastomer or thermoplastic.
  • the field grading electrode is conductive.
  • a field grading electrode according to the first aspect is assembled to a conductor of the switchgear, and wherein the conductor and field grading electrode are surrounded by one of: a vacuum, an insulating gas or an insulating fluid.
  • a method of field grading protecting a conductor for a low, medium or high voltage switchgear comprises assembling a field grading electrode to the conductor.
  • the field grading electrode comprises an elastomer or thermoplastic.
  • the field grading electrode is conductive or semiconductive.
  • Figs. 1-2 show examples of field grading electrodes that can be assembled to conductors of low, medium or high voltage switchgears to provide field grading protection.
  • the field grading electrode is configured to be assembled to a conductor of a low, medium or high voltage switchgear.
  • the field grading electrode comprises an elastomer or thermoplastic.
  • the field grading electrode is conductive or semiconductive.
  • At least one portion of the elastomer or thermoplastic is flexible.
  • At least one portion of the elastomer or thermoplastic is resilient.
  • the at least one portion of the elastomer or thermoplastic that is flexible is resilient.
  • a portion of the elastomer or thermoplastic comprises a large radius for field grading.
  • the portion of the elastomer or thermoplastic that comprises a large radius is different to the at least one portion that is flexible and/or is different to the at least one portion that is resilient.
  • the field grading electrode comprises a single piece of elastomer or thermoplastic.
  • the elastomer is a conductive elastomer or thermoplastic.
  • the elastomer comprises one or more conductive or semiconductive outer layers.
  • the field grading electrode in one form is configured to be slid onto an end of the conductor.
  • the field grading electrode in another form is configured to be inserted into an end of the conductor.
  • the field grading electrode comprises silicone.
  • the field grading electrode comprises ethylene-propylene-diene (EPDM) elastomer.
  • EPDM ethylene-propylene-diene
  • the field grading electrode once assembled to the conductor can move on the conductor.
  • the field grading electrode can be utilized in a switch system for a low, medium or high voltage switchgear.
  • the switch system comprises:
  • the field grading electrode provides an homogenization of the electric field around the moving or fixed or indeed both contacts.
  • At least a part of the field grading electrode is configured to deform elastically during switching operation.
  • the field grading electrode is configured to withstand piercing and/or sparking during switching operation.
  • Figs. 1-2 not only in general relate to a field grading electrode, but they also relate to a conductor for a low, medium or high voltage switchgear with field grading protection.
  • a field grading electrode is assembled to the conductor.
  • the field grading electrode comprises an elastomer or thermoplastic.
  • the field grading electrode is conductive or semiconductive.
  • the field grading electrode can comprise a carbon black filled elastomer or thermoplastic.
  • At least one portion of the elastomer or thermoplastic is flexible.
  • At least one portion of the elastomer or thermoplastic is resilient.
  • the at least one portion of the elastomer or thermoplastic that is flexible is resilient.
  • a portion of the elastomer or thermoplastic comprises a large radius for field grading.
  • the portion of the elastomer or thermoplastic that comprises a large radius is different to the at least one portion that is flexible and/or is different to the at least one portion that is resilient.
  • the field grading electrode comprises a single piece of elastomer or thermoplastic.
  • the elastomer is a conductive or semiconductive elastomer or thermoplastic.
  • the elastomer comprises one or more conductive or semiconductive outer layers.
  • the field grading electrode in one form is assembled to the conductor by being slid onto an end of the conductor.
  • the field grading electrode in another form is assembled to the conductor by being inserted into an end of the conductor.
  • the field grading electrode comprises silicone.
  • the field grading electrode comprises ethylene-propylene-diene (EPDM).
  • a spring is located between the field grading electrode and the conductor.
  • a low, medium or high voltage switchgear can therefore make use of such a field grading electrode.
  • a low, medium or high voltage switchgear has a field grading electrode, as described above, assembled to a conductor of the switchgear. The conductor and field grading electrode are then surrounded by one of: a vacuum, an insulating gas or an insulating fluid.
  • Figs. 1-2 not only in general relate to a field grading electrode and a conductor with field grading protection, but also relate to a method of field grading protecting a conductor for a low, medium or high voltage switchgear.
  • the method comprises assembling a field grading electrode to the conductor.
  • the field grading electrode comprises an elastomer or thermoplastic.
  • the field grading electrode is conductive or semiconductive.
  • the field grading electrode comprises carbon black filled elastomer or thermoplastic.
  • At least one portion of the elastomer or thermoplastic is flexible.
  • At least one portion of the elastomer or thermoplastic is resilient.
  • the at least one portion of the elastomer or thermoplastic that is flexible is resilient.
  • a portion of the elastomer or thermoplastic comprises a large radius for field grading.
  • the portion of the elastomer or thermoplastic that comprises a large radius is different to the at least one portion that is flexible and/or is different to the at least one portion that is resilient.
  • the field grading electrode comprises a single piece of elastomer or thermoplastic.
  • the elastomer or thermoplastic is a conductive or semiconductive elastomer.
  • the elastomer or thermoplastic comprises one or more conductive or semiconductive outer layers.
  • the method comprises sliding the field grading electrode in one form onto an end of the conductor.
  • the method comprises inserting the field grading electrode in another form into an end of the conductor.
  • the field grading electrode comprises silicone.
  • the field grading electrode comprises ethylene-propylene-diene (EPDM).
  • the method comprises locating a spring between the field grading electrode and the conductor.
  • metallic materials are used as field grading electrodes on conductor parts.
  • metallic field grading electrodes are used on conductors for switches or disconnectors.
  • the inflexibility of such metallic field grading parts can be problematic.
  • a springing functionality is needed for the movement of such parts.
  • metallic springs are used for this task.
  • the metallic field grading electrode must be joined to the conductor via screwing or clipping for example.
  • a conductive or semiconductive field grading electrode in the form of an elastomer or thermoplastic that can be in the form of a single part based on conductive or semiconductive elastomers or a conductive or semiconductive coated elastomer or thermoplastic, is assembled to the conductor.
  • Such material provides both a field grading function and can also provide the springing function.
  • a further advantage is that less parts are needed leading to a reduction of assembling time and costs.
  • the elastomer or thermoplastic can be slid over or inserted into the conductor, and no specific further joining mechanism is required.
  • the new field grading electrode comes in the form of a flexible, conductive or semiconductive elastomer or thermoplastic that serves as field grading electrode and combines also a resilient function through the material itself.
  • elastomers or thermoplastic that are assembled on conductor parts for field grading purposes.
  • Such elastomers or thermoplastics could consist of silicones or EPDM.
  • Either conductive elastomers or thermoplastics are used or standard elastomers or thermoplastics that are coated by conductive or semiconductive layers can be used. If especially round conductors are used for the current path, elastic rings can serve as field grading.
  • Elastomers or thermoplastics that are semiconductive, for example that comprise carbon black, can be utilized.
  • reference to a field grading electrode being conductive means that it could be semiconductive.
  • An advantage of the new field grading electrode is that no further joining techniques are needed allowing for an easy and fast assembly.
  • This resilient connection could consist of metal springs however can also make use of certain shapes of the elastomer or thermoplastic itself. Such a shape could consist of a round part with larger radius for field grading and a flexible part for springing (see for example Fig. 1 ).
  • the flexible part can be designed in such a way that the field control can be actuated and rolled back by the contact system.
  • the elastomer or thermoplastic can either be slid on the outer surface ( Fig. 1 ) or for plug-shaped electrodes can be stuck inside tubular conductors (see Fig. 2 ).

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  • Push-Button Switches (AREA)
EP20189418.5A 2020-08-04 2020-08-04 Feldabstufungselektrode Pending EP3951819A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20189418.5A EP3951819A1 (de) 2020-08-04 2020-08-04 Feldabstufungselektrode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20189418.5A EP3951819A1 (de) 2020-08-04 2020-08-04 Feldabstufungselektrode

Publications (1)

Publication Number Publication Date
EP3951819A1 true EP3951819A1 (de) 2022-02-09

Family

ID=72178338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20189418.5A Pending EP3951819A1 (de) 2020-08-04 2020-08-04 Feldabstufungselektrode

Country Status (1)

Country Link
EP (1) EP3951819A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4420662A (en) * 1980-10-31 1983-12-13 Bbc Brown, Boveri & Company Ltd. Compressed-gas circuit breaker
EP0556478A1 (de) * 1992-02-15 1993-08-25 Asea Brown Boveri Ag Trennschalter für eine metallgekapselte gasisolierte Hochspannungsanlage
EP1544881A1 (de) * 2003-12-19 2005-06-22 ABB Technology AG Düse für eine gasisolierte Schaltvorrichtung und zugehörige Schaltvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4420662A (en) * 1980-10-31 1983-12-13 Bbc Brown, Boveri & Company Ltd. Compressed-gas circuit breaker
EP0556478A1 (de) * 1992-02-15 1993-08-25 Asea Brown Boveri Ag Trennschalter für eine metallgekapselte gasisolierte Hochspannungsanlage
EP1544881A1 (de) * 2003-12-19 2005-06-22 ABB Technology AG Düse für eine gasisolierte Schaltvorrichtung und zugehörige Schaltvorrichtung

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