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
  • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
  • H01H33/18—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
  • H01H33/187—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet comprising a hollow annular arc runner and a central contact between which a radially drawn arc rotates

Definitions

• Quenching coil for gas-insulated switch disconnectors Description The invention relates to an quenching coil for gas-insulated switch disconnectors according to the preamble of claim 1.
• switch disconnectors in gas-insulated medium-voltage switchgear, the phases of which are equipped with quenching coils to ensure the switching capability.
• the switching capability among other things This ensures that the arc that arises during switching between the fixed contact and the movable switching contact of the respective phase is kept as small as possible and is quickly extinguished, so that burnt-off on the contacts is largely avoided.
• the quenching coils usually consist of a metallic coil core, on which a single-layer or multi-layer winding is applied, into which the arc is conducted and rotates before it is extinguished by the magnetic field thereby created.
• the means for ensuring the switching capability can consist in the fact that the quenching coils have an auxiliary contact (EP 0 313 106 A2, EP 0 676 782 A2) or a “commutation element” (GB 2 196 794 A) at a distance from the fixed contact, via which the switching con - the base point of the arc on the clock side (EP 0 313 106 A2) or the base point on the fixed contact side (the two other objects) is transferred to the coil and the arc is subsequently extinguished in it, the switching contact making direct contact with the auxiliary contact formed on the respective coil core.
• the subject of EP 0 021 577 A1 is also a switch disconnector, the phases of which are equipped with an arcing coil.
• This has a winding core (coil core) and a single-layer winding.
• An auxiliary contact for a switching contact protruding into the winding body is arranged in the interior of the winding body, and is contacted by the switching contact during a switching operation before the main contact is closed or separated in order to keep the resulting arc small and to extinguish it in the shortest possible way.
• the auxiliary contact serves as an element that defines the course of the arc between the switching contact and the winding body of the coil, the inner surface of the winding body serving as a running surface for the arc.
• the winding body also has an electrode on the side of the contacts for controlling the electrical field of the switching and isolating path. 2
• WO 98/06120 describes a switchgear assembly with a switch disconnector which is used as a transformer switch and the phases of which are provided with an arcing coil.
• the quenching coil has a winding body with a guide element for arc conduction into the coil, which extends into the immediate vicinity of the fixed contact and is arranged tangentially to the path of movement of the free end of the switching contact and which takes over the base point of the arc on the fixed contact side.
• the quenching coil is a single-layer or multi-layer winding arranged on a winding body made of metal and has a base point of the arc that takes over the arc-guiding element, which is electrically connected to the winding and extends into the immediate vicinity of the fixed contact and tangential to the movement path of the free end of the Switch contact is arranged.
• the guide element is not necessarily directed at the base point of the arc.
• the quenching coil In order to arrange the conductor element close to the contact and close to the movement path of the switch contact, the quenching coil must be arranged at an obtuse or at right angles to the switch contact.
• the winding body consists of a non-magnetic metal and the winding usually consists of a copper tape with a foil insulation between the bandages, the beginning of the copper tape preferably being mechanically and therefore also electrically connected to the winding body by soldering, riveting or screwing.
• the guide element is a guide plate that has the width of a switching knife, which is designed as a double switching knife and is known to be used in generic switchgear and which, in the “EW switching position, makes fixed contact between the two switching knives arranged at a distance from one another.
• This means that the baffle has a considerable width.
• This baffle is a separate part that is electrically connected to the coil winding via the winding body.
• This object is achieved in a quenching coil according to the preamble of claim 1 by its characterizing features.
• Advantageous configurations are listed in the subclaims.
• the quenching coil formed in a known manner from a winding body, a single or multi-layer winding connected to a fixed contact potential and a field control electrode is designed and arranged according to the invention in such a way that the contacts - a fixed contact and a movable switching contact - face the respective phase of the switch disconnector End turn of the winding is bare metal, that the end portion of this turn is directed to the fixed contact-side base of the arc, where the arc attaches when the movable contact switches, and that the free end of the end section is a minimum distance from this base point and to the has movable contact at the end.
• the end turn of the winding facing away from the contacts is connected to the fixed contact potential.
• the arc runs on the end turn.
• the quenching coil can be used on all switch disconnectors or switches where a load switching capacity is required, regardless of the switch design and the spatial conditions in the switch contact area.
• the winding body can consist of a conductive plastic and have an electrode element for field control on the contact side.
• a cover made of a conductive plastic is arranged above the winding and also has an electrode element for field control on the contact side.
• the end of the winding wire is arranged so that an arc that arises between the contacts commutates into the quenching coil. So the contact side is free 4
• End portion of the end turn regardless of its direction determined by the position of the fixed contact, can be fixed in a simple manner to the arc electrode formed from the two electrode elements in a predetermined manner.
• a plastic can advantageously be used, which preferably has a conductivity of 50 to 5000 ohm volume resistance.
• the plastic can be provided with constituents which emit extinguishing gas when the arc arises and the associated heating, so that the extinguishing gas concentration in the area of the quenching coil and the switching path is increased and the quenching capacity of the quenching coil is increased.
• the contact-side free end section of the turn can also be provided with a sheath with increased erosion resistance in order to increase the service life of the quenching coil, preferably with a pressed-on sleeve.
• the winding body is advantageously provided on the side facing away from the contacts to facilitate the assembly of the quenching coil with an integrally formed fastening element, the design of which can be predetermined depending on the respective switch type or the spatial conditions.
• This fastening element can also serve as a holder and guide for the end of the winding facing away from the contact, so that these can be mechanically and electrically connected to the respective contact element, for example a busbar.
• the fastening element can have a press-in groove for the end of the winding.
• FIG. 1 a quenching coil according to the invention with a fixed contact arranged centrally in it
• FIG. 2 a further arrangement of the quenching coil with a centrally arranged fixed contact
• FIG. 3 a second embodiment of the quenching coil, arranged next to a fixed contact.
• a quenching coil 1 which surrounds a fixed contact 2 and together with this on a fixed contact carrier 3, with a busbar, not shown 5 is connected, is arranged.
• a movable switch contact 4 is operatively connected to the fixed contact 2.
• the quenching coil 1 has a winding body 5 made of a conductive plastic (POM - polyoxymethylene) with a conductivity of essentially 4000 ohm volume resistance, a single-layer winding 6 and a cover 7 covering this made of the same plastic.
• An electrode element 8 and 8a for field control of the switching and isolating path is formed on the winding body 5 and on the cover 7 on the side of the contacts 2 and 4.
• the end turn 9 facing contacts 2 and 4 is bright metallic (not shown), the other turns are insulated.
• the end section 10 of this turn is angled in the radial direction toward the coil interior and is directed at the base point of the arc at the fixed contact 2.
• the free end has a distance a of 5 mm from this base point and from the moving contact 4, which is also moving past, and also from the movable contact 4.
• the end region 11 of the winding 6 facing away from the contacts 2 and 4 is together with a fastening element 12 formed on the winding body 5 screwed to the fixed contact body 3 with a fastening screw 13 and electrically connected.
• the fastening element 12 has a press-in groove (not shown) for the end region 11 and serves as a holder and guide for this.
• Fig. 2 shows that the free end of a movable contact 4a (double switching knife) is arranged in the closed position with a fixed contact 2a in the quenching coil 1.
• the end region 10 of the end turn 9 facing the contacts 2a and 4a is located in the immediate vicinity of the fixed contact 2a in the swiveling range of the movable contact 4a in the area between its diameters.
• the contact 4 (4a) If the contact 4 (4a) is pivoted into its open position, it detaches from the fixed contact 2 (2a) with the formation of an arc between the central region of the upper edge of the fixed contact 2 (2a) and the movable contact 4 (4a). When the contact 4 (4a) has passed the end of the end region 10, the base point of the arc on the fixed-contact side is taken over by this end region 10, the arc is conducted into the winding 6 and extinguished in a known manner.
• FIG. 3 shows a further embodiment and arrangement of a quenching coil 14 according to the invention on one phase of a circuit breaker.
• the quenching coil 14 is arranged next to the fixed contact 15 on the fixed contact carrier 16 with its axis A at an angle of 30 ° with respect to the latter. It has a winding body 17 with one on the Fixed contact carrier 16 facing away from the electrode element 18, a single-layer winding 19, a cover 20 with an electrode element 21 and a molded fastening element 22.
• the end section 23 of the contact-side, bare metal end turn 24 is directed at the fixed contact base point of the arc formed when the movable contact 25, which is designed as a double switching knife, is separated from the fixed contact 15, the distance between the end of the end section 23 and this fixed contact Is 3 mm.
• the end section 23 is angled at an angle of 30 ° with respect to the axis A and is supported by a support element 26 formed on the cover 20.
• the fastening element 22 is formed on the winding body 17 on the fixed contact carrier side, to which the end region 27 of the winding 19 facing the fixed contact carrier 16 is guided and is mechanically and electrically fixed to the fixed contact carrier 16 together with the fastening screw 28.

Landscapes

• Arc-Extinguishing Devices That Are Switches (AREA)
• Transformer Cooling (AREA)
• Gas-Insulated Switchgears (AREA)
• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7862320

Family Applications (1)

Country Status (10)

Families Citing this family (4)

Family Cites Families (5)

• 1998
  • 1998-03-26 DE DE19813217A patent/DE19813217C1/de not_active Expired - Fee Related
• 1999
  • 1999-03-19 PL PL341863A patent/PL191260B1/pl unknown
  • 1999-03-19 DE DE59900543T patent/DE59900543D1/de not_active Expired - Lifetime
  • 1999-03-19 CZ CZ20000918A patent/CZ296224B6/cs not_active IP Right Cessation
  • 1999-03-19 AT AT99910366T patent/ATE210886T1/de not_active IP Right Cessation
  • 1999-03-19 BR BR9908370-1A patent/BR9908370A/pt not_active IP Right Cessation
  • 1999-03-19 WO PCT/EP1999/001828 patent/WO1999049488A1/fr active IP Right Grant
  • 1999-03-19 EP EP99910366A patent/EP1064663B1/fr not_active Expired - Lifetime
  • 1999-03-19 ES ES99910366T patent/ES2168857T3/es not_active Expired - Lifetime
  • 1999-03-19 CN CN99801182A patent/CN1120511C/zh not_active Expired - Fee Related
• 2000
  • 2000-02-09 NO NO20000646A patent/NO317375B1/no not_active IP Right Cessation

Non-Patent Citations (1)

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