EP4086930A1 - Metallischer antrieb für elektrischen schalter - Google Patents

Metallischer antrieb für elektrischen schalter Download PDF

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Publication number
EP4086930A1
EP4086930A1 EP21172726.8A EP21172726A EP4086930A1 EP 4086930 A1 EP4086930 A1 EP 4086930A1 EP 21172726 A EP21172726 A EP 21172726A EP 4086930 A1 EP4086930 A1 EP 4086930A1
Authority
EP
European Patent Office
Prior art keywords
contact surface
drive
polymer material
polymer
metal
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
EP21172726.8A
Other languages
English (en)
French (fr)
Inventor
Julia VIERTEL
Göran Paulsson
Shailendra Singh
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 EP21172726.8A priority Critical patent/EP4086930A1/de
Publication of EP4086930A1 publication Critical patent/EP4086930A1/de
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/62—Lubricating means structurally associated with the switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/24—Power arrangements internal to the switch for operating the driving mechanism using pneumatic or hydraulic actuator
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/26—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/28—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor

Definitions

  • the present disclosure relates to a metal drive for operating an electrical switch of a switchgear, in which drive different parts of the drive move in relation to, and in contact with, each other, e.g. by rolling or sliding.
  • Circuit breakers and switches in switchgears such as ring main units, are operated by drives comprising spring type mechanisms, magnetic or pneumatic actuators etc. or a combination thereof.
  • drives comprising spring type mechanisms, magnetic or pneumatic actuators etc. or a combination thereof.
  • several different mechanical parts move and their surfaces slide against each other at high speed or they stay in contact with each other during energy storage.
  • the parts are conventionally lubricated with grease.
  • Grease lubricated drives need maintenance in form of re-greasing or replacement in certain time intervals as the lifetime of the grease is limited compared to the 25-30 years of lifetime of the switchgears.
  • the right type of grease needs to be chosen, depending on the climate conditions of the place where the switchgear is positioned when operating. Additionally, grease is only useful within a limited temperature range. In case of aged grease or wrong type of grease there is an increased risk for failure of the drive mechanism which prevents the switching operation of the switchgear.
  • the all polymer drives are used for low energy applications and still have to scale up when higher currents and voltages are involved during switching.
  • the fatigue curve (SN diagram) for polymers shows much lower strength even at 10 000 cycles, which is the operating requirement for M2 qualification in a switchgear certification.
  • a metal drive which may be regarded as a hybrid drive, in which a core of at least one of the parts of the drive is metal to provide strength, while at least one surface of the part is coated with a polymer material to provide protection against the ambient environment and improved performance.
  • the moving, e.g. sliding and/or rolling, parts of the drive may be at least partly coated with the polymer coating discussed herein, while some other surfaces may be coated by e.g. a combination of polymer and/or metallic coating providing resistance against material degradation of the core metallic structure of the drive parts.
  • An idea is to combine the strengths of metal and polymer drives in a hybrid drive, where the core is made up of metal (having relatively high strength and durability) and a surface is polymer-based providing lower friction and reduced maintenance need. Wear and corrosion resistance may be provided over the entire life-time of the drive and in different environmental conditions such as moderate, arctic or tropic climates.
  • a metal drive for operating an electrical switch of a switchgear.
  • the drive comprises at least a fist part and a second part, the first part comprising a first contact surface arranged to move in relation to, and in contact with, a second contact surface of the second part.
  • Each of the first and second parts comprises a metal core.
  • the first contact surface has a dry lubricant polymer coating of a polymer material applied directly on a metallic material.
  • a switchgear comprising an embodiment of the metal drive of the present disclosure, and comprising the electrical switch.
  • a dry lubricant is provided, reducing or eliminating the need for lubrication maintenance during the lifetime of the drive, while maintaining the advantages of a metal drive over a polymer drive by means of the metal cores of the drive parts.
  • Figure 1 illustrates a switchgear 10 comprising a drive 1 for operating an electrical switch of the switchgear.
  • the drive may be actuated in any conventional way, e.g. spring, magnetically or pneumatically actuated.
  • the drive 1 comprises a plurality of parts 2 which are arranged to move in relation to each other during operation of the drive.
  • the drive 1 is a metal drive, implying that at least the core 4 of each of the parts is of a metallic material.
  • Two parts 2 which are arranged to move in relation to, and in contact with, each other each comprises a contact surface 3 for making contact with the corresponding contact surface 3 of the other part 2.
  • At least one contact surface 3 of at least one part 2 of the drive 1 has a polymer coating 5 of a polymer material 6.
  • the polymer coating is arranged to act as a dry lubricant. That the contact surface 3 has a polymer coating 5 implies that the contact surface is (at least partly) provided by the polymer coating, since the polymer coating 5 provides an outermost surface of the part 2, which then becomes the contact surface 3.
  • the coated part 2 is coated only where it is arranged to contact another part 2 of the drive 1.
  • the coated part 2 is coated also on other surfaces, the metal core 4 being partly or fully enclosed by the polymer coating 5.
  • the polymer coating 5 is applied directly on a metallic material 7 of the part 2.
  • the metallic material 7 is of the metal core 4, implying that the polymer coating is applied directly onto the metal core, without any intermediate layer, but in some embodiments, the metallic material 7 may be provided by intermediate layer 8 provided between the metal core 4 and the polymer coating 5, e.g. e.g. an anti-corrosion layer such as a nickel containing layer.
  • Metallic anti-corrosion nickel layers are conventionally used.
  • first part 2a comprises a first contact surface 3a arranged to move (as indicated by the downward pointing arrow in the figure) in relation to, and in contact with, a second contact surface 3b of the second part 2b.
  • first and second parts 2a and 2b comprises a metal core 4a and 4b.
  • the first contact surface 3a has a dry lubricant polymer coating 5 of a polymer material 6 applied directly on a metallic material 7, e.g. of the metal core 4a or of a metallic intermediate layer 8.
  • the second contact surface 3b is metallic, e.g. of the metal core 4b or of a metallic coating 8.
  • the second contact surface 3b has a dry lubricant polymer coating 5 of a polymer material 6 applied directly on a metallic material 7.
  • the polymer material of the second contact surface may be the same as or different than, preferably different than, the polymer material of the first contact surface.
  • the tribological properties when the two contact surfaces 3a and 3b move in contact with each other are improved when surface materials are different rather than the same, why it is preferred that the polymer coating 5 of the second contact surface 3b is of a different polymer material 6 than the polymer coating 5 of the first contact surface 3a.
  • the second contact surface being of a polymer material 6 rather than being metallic, e.g. for improved tribological properties or reduced heat formation when the first and second contact surfaces move in contact with each other.
  • the drive 1 may have any number of parts 2 and any number of pairs of contact surfaces 3 arranged move in relation to, and in contact with, each other. In any of these pairs, at least one of the contact surfaces 3 may be provided by a polymer coating 5 as discussed herein. In case there is more than one pair of contact surfaces in the drive which are provided with a polymer coating 5, the polymer material 6 may be the same for all coatings 5, e.g. for simplifying the manufacture of the drive 1, or the polymer material 6 of at least one of the coatings 5 may be different from at least one other of the coatings 5. The use of different materials 6 allows the material 6 to be selected depending on the particular requirements on each contact surface, e.g. depending on the pressure, movement and/or temperature the contact surface is intended for.
  • the drive 1 further comprises a third part 2 and a fourth part 2, the third part comprising a third contact surface 3 arranged to move in relation to, and in contact with, a fourth contact surface 3 of the fourth part.
  • the third contact surface has a dry lubricant polymer coating 5 of a polymer material 6 applied directly on a metallic material 7.
  • the fourth contact surface 3 has a dry lubricant polymer coating 5 of a polymer material 6 applied directly on a metallic material 7, the polymer material of the fourth contact surface being the same as or different than, preferably different than, the polymer material of the third contact surface.
  • the polymer material 6 of the third contact surface 3 is the same or different than, preferably different than, the polymer material 6 of the first contact surface 3a.
  • a combination of different coating materials 6 can be used within the same drive 1.
  • the polymer material 6 of any polymer coating 5 in the drive 1 may be any suitable polymer material. Since the drive is not involved in the conduction of an electrical current, that being handled by the switch of the switchgear, the polymer material does not have to be electrically conducting, and typically is electrically insulating though electrically conducting materials are not excluded.
  • the polymer material 6 may conveniently be or comprise a thermoplastic material or a thermosetting material, optionally comprising a filler material as an additive.
  • thermoplastic materials 6 examples include thermoplastic materials comprising or consisting of polyaryletherketones (PAEK), for instance polyether ether ketone (PEEK) or polyetherketone (PEK); fluoropolymers, for instance polytetrafluoroethylene (PTFE); ultrahigh molecular weight poly ethylene (UHWPE); polyamides (PA); polyimides (PI); and/or polyoxymethylen (POM).
  • PAEK polyaryletherketones
  • PEEK polyether ether ketone
  • PEK polyetherketone
  • fluoropolymers for instance polytetrafluoroethylene (PTFE); ultrahigh molecular weight poly ethylene (UHWPE); polyamides (PA); polyimides (PI); and/or polyoxymethylen (POM).
  • PEEK polyaryletherketones
  • PEK polyether ketone
  • fluoropolymers for instance polytetrafluoroethylene (PTFE); ultrahigh molecular weight poly ethylene (
  • thermosetting materials 6 includes thermosetting materials comprising or consisting of an epoxy and/or phenolic varnish, preferably an epoxy varnish.
  • suitable filler additive includes a filler comprising or consisting of graphite, molybdenum disulphide (MoS2), tungsten disulphide (WS2) and/or PTFE, preferably MoS2 and/or PTFE.
  • a specific example of suitable polymer material 6 comprising a filler is an epoxy varnish comprising a MoS2 and/or PTFE filler.
  • any or all polymer coating(s) 5 in the drive 1 has a thickness within the range of 5-100 ⁇ m, preferably within the range of 10-50 ⁇ m.
  • the coating 5 may be applied to the part 2 using an automated coating process, e.g. including spray coating, drum coating or powder coating, depending on the polymer material 6 used.
  • the first contact surface 3a is arranged to move in relation to the second contact surface 3b by sliding or rolling, e.g. by sliding against the second contact surface.
  • rolling contact may be in a ball bearing, e.g. where at least one of the balls is coated with the polymer material 6.
  • parts 2 include e.g. a spring actuator, or any part 2 arranged to be moved by an actuator e.g. a spring, magnetic or pneumatic actuator, in the drive 1.
  • any of the respective metal cores 4 of the drive 1, e.g. the metal core 4a of the first part 2a and/or the metal core 4b of the second part 2b are of made of steel.
  • Steel can provide the strength and durability desired for the drive 1.
  • the core 4 may be made of a spring steel.
  • FIG. 2 illustrates a switchgear 10 comprising an electrical switch 11 for switching an electrical current I having the voltage U.
  • the switchgear 10 thus comprises the drive 1 discussed above, as well as the switch 11 (and possibly further switches 11).
  • the switchgear 10 may be any switchgear configured for breaking or switching a current I by means of the at least one switch 11.
  • the switchgear 10 may e.g. be configured for breaking or switching a current I having a voltage within the medium voltage range, e.g. within the range of 1-52 kV.

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  • Mechanisms For Operating Contacts (AREA)
EP21172726.8A 2021-05-07 2021-05-07 Metallischer antrieb für elektrischen schalter Pending EP4086930A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21172726.8A EP4086930A1 (de) 2021-05-07 2021-05-07 Metallischer antrieb für elektrischen schalter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21172726.8A EP4086930A1 (de) 2021-05-07 2021-05-07 Metallischer antrieb für elektrischen schalter

Publications (1)

Publication Number Publication Date
EP4086930A1 true EP4086930A1 (de) 2022-11-09

Family

ID=75870460

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21172726.8A Pending EP4086930A1 (de) 2021-05-07 2021-05-07 Metallischer antrieb für elektrischen schalter

Country Status (1)

Country Link
EP (1) EP4086930A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060245675A1 (en) * 2005-04-28 2006-11-02 Hubert Lang Bearing element
US8119577B2 (en) * 2005-03-02 2012-02-21 Acs Coating Systems Gmbh Object comprising a friction-reducing coating, and method for the production of a coating
US20120199558A1 (en) * 2011-02-05 2012-08-09 Faulkner Roger W Commutating Circuit Breaker
US20130157024A1 (en) * 2011-11-30 2013-06-20 Rhenotherm Kunststoffbeschichtungs Gmbh Coating containing pek and/or peek

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8119577B2 (en) * 2005-03-02 2012-02-21 Acs Coating Systems Gmbh Object comprising a friction-reducing coating, and method for the production of a coating
US20060245675A1 (en) * 2005-04-28 2006-11-02 Hubert Lang Bearing element
US20120199558A1 (en) * 2011-02-05 2012-08-09 Faulkner Roger W Commutating Circuit Breaker
US20130157024A1 (en) * 2011-11-30 2013-06-20 Rhenotherm Kunststoffbeschichtungs Gmbh Coating containing pek and/or peek

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