EP3547340A1 - Sectionneur à coupure en charge à moyenne tension - Google Patents

Sectionneur à coupure en charge à moyenne tension Download PDF

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Publication number
EP3547340A1
EP3547340A1 EP18164674.6A EP18164674A EP3547340A1 EP 3547340 A1 EP3547340 A1 EP 3547340A1 EP 18164674 A EP18164674 A EP 18164674A EP 3547340 A1 EP3547340 A1 EP 3547340A1
Authority
EP
European Patent Office
Prior art keywords
medium
voltage switch
self
contact
volume
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Withdrawn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
EP18164674.6A
Other languages
German (de)
English (en)
Inventor
Marvin Bendig
Paul Gregor Nikolic
Florian Pleye
Martin Schaak
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 AG
Rheinisch Westlische Technische Hochschuke RWTH
Original Assignee
Siemens AG
Rheinisch Westlische Technische Hochschuke RWTH
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 AG, Rheinisch Westlische Technische Hochschuke RWTH filed Critical Siemens AG
Priority to EP18164674.6A priority Critical patent/EP3547340A1/fr
Publication of EP3547340A1 publication Critical patent/EP3547340A1/fr
Withdrawn legal-status Critical Current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
    • H01H1/12—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
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
    • H01H33/703—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle having special gas flow directing elements, e.g. grooves, extensions

Definitions

  • the invention relates to a medium-voltage switch-disconnector according to the preamble of patent claim 1.
  • Sulfur hexafluoride is currently still used as insulating gas in medium-voltage systems as well as in high-voltage systems, and it is used in another function as an extinguishing gas for an arc occurring between two contacts. Due to its very high global warming potential, different insulating media and extinguishing media are currently being tested as possible replacement solutions for sulfur hexafluoride. However, the extinguishing properties for arcs in the insulation media investigated so far are not yet completely satisfactory.
  • the object of the invention is to provide a medium-voltage switch-disconnector, which has a better extinguishing effect of arcs compared to the usual used in the medium voltage switch disconnectors.
  • the medium-voltage switch-disconnector according to the invention has two contacts, a moving contact and a fixed contact, wherein one of the contacts is at least partially surrounded by an insulating nozzle.
  • the invention is characterized in that at least one self-blowing volume is provided, and that this is arranged in the insulating material nozzle.
  • the arc When disconnecting the contact in the switch-disconnector, there is always an arc that continues to flow.
  • the arc generates, especially in a first phase of a high-current phase, a positive energy balance, which causes the insulating gas in the quenching chamber heats up. This simultaneously leads to a pressure build-up in the already mentioned self-blowing volume.
  • the self-blowing volume is a volume separated with respect to the quenching chamber, but connected thereto by a channel or an opening. In this Diblasvolumen is also the extinguishing gas, which is heated by the action of heat of the arc, resulting in an increase in the pressure of the extinguishing gas in the self-blow volume.
  • the quenching gas flows from the self-blowing volume into the quenching chamber and blows out the arc.
  • the time of this flow reversal is short of the current zero crossing of the current to be interrupted. Since the power loss of the arc is reduced at the same time as sinking current, due to the cooling, a negative energy balance results and also the thermal quenching of the arc occurs at the time of the current zero crossing.
  • a switch-disconnector for medium-voltage applications is provided by arranging the self-blowing volume in an insulating nozzle.
  • the insulating nozzle preferably encloses a tulip contact into which a movable contact can be inserted.
  • the self-blowing volume is arranged in the insulating nozzle.
  • the self-blowing volume or the self-blowing volumes are arranged to save space in the insulating material and serve when opening the medium-voltage circuit breaker to blow directly at the point of origin an arc by means of the named principle.
  • the medium-voltage switch-disconnector is used at rated voltages U m ⁇ 52 kV.
  • the medium-voltage switch-disconnector is preferably constructed in such a way that the insulating material nozzle rotationally symmetrically surrounds the one contact that surrounds it.
  • this contact is preferably the fixed contact, which is surrounded by the insulating material at least partially rotationally symmetrical and this fixed contact is in turn preferably constructed in the form of a tulip contact.
  • This is an embodiment that is conceptually known from high-voltage engineering, but the main difference is that a self-blowing volume is arranged in the insulating nozzle, which achieves a sufficient blowing effect for medium-voltage applications and is extremely space-saving and significantly reduces the manufacturing costs ,
  • openings of the self-blowing volume are aligned in towards a switching axis, ie the opening is pointing at an angle between 0 degrees and 180 degrees to the switching axis. This causes the gas to come out of the self-blowing volume flows out, is directed to the resulting arc and thus a blow-out is enhanced.
  • the medium-voltage switch-disconnector is preferably designed for currents between 200 A and 1900 A.
  • the self-blowing volume has a volume which is between 10 ml and 200 ml, in particular between 20 ml and 90 ml. These volumes are relatively small compared to high voltage applications, but they are sufficient to cause the corresponding arc blowing effects in the medium voltage.
  • circuit breakers are connected in parallel and are operated by a central drive or are in communication with this.
  • three phases of a line can be operated with a switch class. It is only a drive necessary.
  • the insulating nozzle is preferably made of a different material than the contact that surrounds it. Preference is given here to a high-temperature-resistant plastic, in particular polytetrafluoroethylene used.
  • FIG. 1 schematically a medium-voltage circuit breaker is shown, comprising a movable contact 4 and a fixed contact 6.
  • the moving contact 4 is designed in the form of a pin contact
  • the fixed contact 6 is configured in the form of a tulip contact 12.
  • this arrangement could basically be configured reversed, then the moving contact of the tulip contact and the fixed contact of the pin contact.
  • the pin contact 4 is suitably, as in FIG. 1 shown movably mounted along a switching axis 18 in the directions which are represented by the movement arrow 20.
  • FIG. 1 shown form of the medium-voltage switch-disconnector 2 is shown in an open state.
  • the pin contact 4 When the pin contact 4 is moved in the direction of the tulip contact 12, it first passes through a region which is surrounded by an insulating material nozzle 10 before it is retracted into the tulip contact 12.
  • This closed state is in FIG. 2 shown.
  • an arc 24 is produced between the pin contact 4 and the tulip contact 12 (FIG. FIG. 3 ).
  • FIG. 3 shows the opening the switch, it is of technical importance that the arc 24 is erased as quickly as possible.
  • an insulating medium 22 which is in particular a gaseous insulating medium, and which is present in a quenching chamber 14, heated by the heat input of the arc 24 and thereby compacted.
  • the insulating medium 22 is also present in the self-blowing volumes 10, which are connected to the quenching chamber 14 via the openings 16 of the self-blowing volumes 10.
  • the insulating medium 22 is particularly heated in this area around the openings 16 around and thus the pressure of the insulating medium 22 is increased locally in the Dblasvolumina 10.
  • the plural of the term self-blow volume 10 is used, since, depending on the design and requirement, one or more self-blowing volumes are expedient.
  • the insulating medium 22 with increased pressure in the Diblasvolumina 10 is now provided with the reference numeral 22 '. From a certain pressure, the insulating medium 22 'has in the self-blow volumes 10, there is a backflow, which is illustrated by the arrows 23.
  • the flow velocity of the insulating medium 22 'along the arrows 23 is so high that the arc 24 is preferably extinguished at time t L , but at least until time t 0 , ie to the zero crossing of the current curve and not ignited after the zero crossing of the current curve ,
  • the self-blowing volumes 10 have a relatively small volume, which is between 10 ml and 200 ml, preferably between 20 ml and 90 ml. For a medium-voltage switch-disconnector 2, this is sufficient to extinguish the arc 24. This, in turn, makes it possible to arrange one or more self-blowing volumes 10 in the insulating nozzle 8, which, compared to a self-blowing switch known from high-voltage engineering, means a significant reduction in the design-related complexity of the switch. Thus, the switch can also be produced significantly cheaper and find application in medium voltage technology.
  • insulating medium 22 may classic sulfur hexafluoride (SF 6 ), however, also newer investigated media such as gas mixtures based on other fluorinated gases, such as fluoroketones or fluoronitriles are used. Particularly useful is the use of the described medium-voltage circuit breaker using insulating media 22, which have worse extinguishing properties than the sulfur hexafluoride. Such media may require an additional blowing function by the self-blowing volumes 10 to safely extinguish the arc 24.
  • natural gases and air components such as air itself, carbon dioxide or nitrogen can be used as insulating media.
  • These media can also be used as mixed gases or carrier gases to fluorinated gases, such as fluoronitriles or fluoroketones.

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  • Circuit Breakers (AREA)
EP18164674.6A 2018-03-28 2018-03-28 Sectionneur à coupure en charge à moyenne tension Withdrawn EP3547340A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18164674.6A EP3547340A1 (fr) 2018-03-28 2018-03-28 Sectionneur à coupure en charge à moyenne tension

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18164674.6A EP3547340A1 (fr) 2018-03-28 2018-03-28 Sectionneur à coupure en charge à moyenne tension

Publications (1)

Publication Number Publication Date
EP3547340A1 true EP3547340A1 (fr) 2019-10-02

Family

ID=61832443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18164674.6A Withdrawn EP3547340A1 (fr) 2018-03-28 2018-03-28 Sectionneur à coupure en charge à moyenne tension

Country Status (1)

Country Link
EP (1) EP3547340A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207447A (en) * 1977-03-24 1980-06-10 Mitsubishi Denki Kabushiki Kaisha Gas interrupter having narrow and wide arc passages
DE102005019424A1 (de) * 2005-04-25 2006-11-02 Abb Technology Ag Lasttrennschalter
DE102009043195A1 (de) * 2009-09-26 2011-03-31 Rwth Aachen Abbrandelement zur Anordnung an einem Schaltkontakt eines Leistungsschalters

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207447A (en) * 1977-03-24 1980-06-10 Mitsubishi Denki Kabushiki Kaisha Gas interrupter having narrow and wide arc passages
DE102005019424A1 (de) * 2005-04-25 2006-11-02 Abb Technology Ag Lasttrennschalter
DE102009043195A1 (de) * 2009-09-26 2011-03-31 Rwth Aachen Abbrandelement zur Anordnung an einem Schaltkontakt eines Leistungsschalters

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