EP0239460B1 - Disjoncteur électrique à tenue diélectrique ameliorée - Google Patents

Disjoncteur électrique à tenue diélectrique ameliorée Download PDF

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Publication number
EP0239460B1
EP0239460B1 EP87400528A EP87400528A EP0239460B1 EP 0239460 B1 EP0239460 B1 EP 0239460B1 EP 87400528 A EP87400528 A EP 87400528A EP 87400528 A EP87400528 A EP 87400528A EP 0239460 B1 EP0239460 B1 EP 0239460B1
Authority
EP
European Patent Office
Prior art keywords
casing
circuit breaker
insulating
contact
lateral surface
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.)
Expired - Lifetime
Application number
EP87400528A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0239460A1 (fr
Inventor
Raymond Soboul
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin SA
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 Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0239460A1 publication Critical patent/EP0239460A1/fr
Application granted granted Critical
Publication of EP0239460B1 publication Critical patent/EP0239460B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/52—Cooling of switch parts
    • 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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/52—Cooling of switch parts
    • H01H2009/526—Cooling of switch parts of the high voltage switches
    • 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
    • H01H33/121—Load break switches
    • H01H33/122—Load break switches both breaker and sectionaliser being enclosed, e.g. in SF6-filled container

Definitions

  • a puffer circuit breaker of the kind mentioned is described in French Patent No. 2,441,916 of the applicant.
  • the circuit breaker comprises a main circuit having a fixed main contact cooperating with a movable main contact, and an auxiliary shunting circuit having a fixed arcing contact and a movable arcing contact.
  • the main circuit is connected directly to the connection terminals by extending along a directly adjacent trajectory and shorter than that of the auxiliary circuit.
  • the circuit breaker is fitted with fixing studs coming from molding with the insulating envelope, and comprising inserts to receive screws when the circuit breaker is fixed to the metal support brought to ground potential.
  • the outer lateral surface of the enclosure is smooth, which poses a problem of electrical insulation and dielectric strength of the circuit breaker in the presence of a high nominal voltage, for example greater than 20 kV. It is therefore imperative to increase the dimensions of the envelope to adapt the distance in air to the minimum value prescribed by the standards. The modification of the envelope causes an increase in the size and the manufacturing cost of the circuit breaker.
  • the object of the invention is to increase the electrical insulation of such a self-blowing circuit breaker while retaining the internal dimensions of the envelope filled with insulating gas with high dielectric strength.
  • the envelope is provided with an annular rib projecting in line with an orifice provided in the wall of the envelope for the passage of the metallic transmission shaft coupled to the mechanism. external control.
  • the presence of the rib around the shaft increases the line of flight between the nearest connection terminal and the shaft at ground potential.
  • connection terminals can receive sockets each comprising a racking arm which a first end rigidly secured to each connection terminal, and a second opposite end which carries a racking clamp, the racking arm is shaped like a radiator comprising a metal body fitted with cooling fins on its external face.
  • the first end of the racking arm comprises a curved cover of revolution intended to cover the projecting edges of the corresponding connection terminal.
  • a pole of an electric circuit breaker 10 with self-blowing is housed in a sealed envelope 12 of molded insulating material, filled with an electronegative insulating gas with high dielectric strength, especially of sulfur hexafluoride.
  • the casing 12 of elongated shape made of epoxy resin contains a main circuit 14 for passing the nominal current having a pair of main contacts 16, 18 one of which is movable, and an auxiliary circuit 20 for shunting the main circuit 14 having a pair of arcing contacts 22, 24 one of which is movable (in dotted lines in fig. 2).
  • a pair of bushings 26, 28 offset from one another in the longitudinal direction radially pass through the wall of the enclosure 12 to constitute an input terminal 30 and an output terminal 32 of the pole of the circuit breaker 10.
  • each connection terminal 30, 32 is equipped with a power outlet 34, 36 formed by a contact clip racking arm 38.
  • the circuit breaker 10 is mounted on a carriage 37 mobile, provided with rolling members 39 allowing movement in translation of the circuit breaker 10 between the plugged-in and withdrawn positions.
  • the side wall of the insulating casing 12 comprises a pair of fixing studs 40, 42 intended to mechanically secure the circuit breaker 10 to a metal support 44 electrically connected to ground.
  • the support 44 of the circuit breaker 10 can be part of a fixed frame (fig. 2) or be installed on the mobile carriage 37 (fig. 1).
  • the studs 40, 42 are produced by molding with the insulating casing 12, so as to project from the side wall situated opposite the bushings 26, 28.
  • Metal inserts 46 embedded in the end of each stud 40, 42 insulator can receive assembly screws (not shown) when fixing the circuit breaker 10 to the support 44.
  • the opposite open ends 48, 50 of the envelope 12 are closed respectively by means of a lower cover 52 and an upper cover 54.
  • a molecular sieve 56 is housed inside the envelope 12 in a cavity of the lower cover 52.
  • An external control mechanism (not shown) is mechanically coupled to a crank 58 wedged on a rotary shaft 60 passing through an orifice 62 of the casing 12 with the interposition of a dynamic sealing system 64.
  • the shaft 60 is articulated to an insulating transmission rod 66 intended to drive the moving element of the pole of the circuit breaker 10.
  • the orifice 62 for passage of the rotary shaft 60 is disposed between the fixing stud 40 and the bottom 48 of the casing 12.
  • the movable main contact 18 of the main circuit 14 is pivotally mounted on a fixed pin 68 carried by the lower bushing 26.
  • An intermediate kinematic link 70 mechanically connects the movable main contact 18 to a rod 72 for movable control in translation having an end hinged to the insulating connecting rod 66, and an opposite end carrying the movable arcing contact 24.
  • the rod 72 is conductive, and is electrically connected to the lower bushing 26 by a flexible connecting conductor 74.
  • the kinematic link 70 transforms the rectilinear movement of the rod 72 into a pivoting movement of the movable main contact 18, the assembly being arranged to cause the separation of the main contacts 16, 18 before that arcing contacts 22, 24.
  • the pivoting movement of the movable main contact 18 is thus derived from the sliding movement of the rod 72 for controlling the movable arcing contact 24.
  • a self-blowing device with piston 76 and cylinder 78 for compressing the gas is associated with the pair of arcing contacts 22, 24, and is actuated during movement of the control rod 72 to generate pneumatic blowing of the drawn arc when separation of arcing contacts 22, 24.
  • the fixed main contact 16 is supported by a fixed connection system 80 electrically connected to the top bushing 28.
  • the fixed arcing contact 22 is also connected to the top bushing 28.
  • the main circuit 14 is connected directly to the bushings 26, 28 by extending along a longitudinal trajectory directly adjacent and shorter than that of the auxiliary circuit 20 offset in the transverse direction.
  • the outer lateral surface of the insulating casing 12 comprises a plurality of longitudinal fins 82 intended to increase the line of flight between the conductive terminals 30, 32 and the mass of the metal support 44, constituting two active parts of different polarities.
  • the creepage distance corresponds to the shortest distance between these parts on the surface of the insulating material of the casing 12 and of the fixing studs 40, 42.
  • the value of the creepage distance is greater than the distance in the air between the same parts.
  • the fins 82 are formed by external longitudinal ribs coming from molding with the casing 12, and extending over the entire length between the bottoms 48, 50 of the casing 12 in a direction parallel to the longitudinal axis (see fig . 1 and 8).
  • the internal wall of the lateral surface of revolution of the envelope 12 is smooth while the external fins 82 are advantageously distributed at regular intervals on either side of each terminal 30, 32 over a fraction of the external wall of the envelope 12 (see fig. 7).
  • the remaining part of the wall between the fins 82 and the fixing studs 40, 42 is smooth.
  • the casing 12 has a rib 84 additional to the level of the orifice 62 for passage of the rotary shaft 60, which is made of metallic material and connected to the ground potential.
  • the rib 84 has an annular outer rim which increases the line of flight between the lower terminal 30 and the control shaft 60. The rim is arranged back from the insulating stud 40.
  • the presence of the longitudinal fins 82 and the annular rib 84 on the external surface improves the dielectric strength and the electrical insulation of the circuit breaker without increasing the internal dimensions of the casing 12.
  • the nominal voltage of the circuit breaker can thus drop from 18 kV at 24 kV.
  • the fins 82 also participate in the cooling of the insulating gas during a cut.
  • connection system 80 of the fixed main contact 16 is at the potential of the upper terminal 28, while the movable arcing contact 24 and the conductive rod 72 are at the potential of the lower terminal 30. This potential difference generates a large electric field in this area.
  • the connection system 80 comprises two bars 86, 88 parallel flat copper bars (fig. 3 to 5), each having a rectangular section with rounded edges 90.
  • the fixed main contact 16 is provided with a shank 92 serving as a spacer sandwiched between the two offset bars 86, 88.
  • Fixing screws 94 assemble the fixed main contact 16 to the two bars 86, 88 of the connection system 80.
  • the presence of the rounded edges 90 on the bars 86, 88, and of the intermediate wall of the cylinder 78 prevent any priming. internal.
  • each socket 34, 36 of a withdrawable circuit breaker is arranged as a radiator 95 having a metallic body 96 having on its external face a series of cooling fins 98.
  • the annular fins 96 come from foundry with the body 96 and ensure a good heat dissipation during current flow.
  • the body 96 is rigidly secured to the connection terminal 30, 32 of the corresponding bushing 26, 28 by means of a fixing stud 100 extending in the hollow internal part 102 of the body 96.
  • the radiator 95 is equipped with the 'one of its ends of a curved cover 104 of revolution which covers the projecting edges of the connection terminal 30, 32.
  • the other end of the radiator 95 serves to support the clamp 38 for racking.
  • the presence of the cover 104 integrated into the fins 98 of the radiator 95 improves the dielectric strength of the circuit breaker.
  • the invention has been described in application with a pneumatic self-blowing circuit breaker with piston-cylinder for compression of the insulating gas, but it extends to any other type of circuit breaker, in particular self-expanding and / or magnetic blowing by rotation of the arc by means of a permanent magnet or a coil.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)
EP87400528A 1986-03-26 1987-03-10 Disjoncteur électrique à tenue diélectrique ameliorée Expired - Lifetime EP0239460B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8604493A FR2596576B1 (fr) 1986-03-26 1986-03-26 Disjoncteur electrique a autosoufflage a tenue dielectrique amelioree
FR8604493 1986-03-26

Publications (2)

Publication Number Publication Date
EP0239460A1 EP0239460A1 (fr) 1987-09-30
EP0239460B1 true EP0239460B1 (fr) 1992-06-03

Family

ID=9333653

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400528A Expired - Lifetime EP0239460B1 (fr) 1986-03-26 1987-03-10 Disjoncteur électrique à tenue diélectrique ameliorée

Country Status (9)

Country Link
US (1) US4748304A (zh)
EP (1) EP0239460B1 (zh)
JP (1) JPS62234826A (zh)
KR (1) KR950003869B1 (zh)
CN (1) CN1014371B (zh)
CA (1) CA1289605C (zh)
DE (1) DE3779470D1 (zh)
FR (1) FR2596576B1 (zh)
IN (1) IN168698B (zh)

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US6037555A (en) 1999-01-05 2000-03-14 General Electric Company Rotary contact circuit breaker venting arrangement including current transformer
US6087913A (en) 1998-11-20 2000-07-11 General Electric Company Circuit breaker mechanism for a rotary contact system
US6114641A (en) 1998-05-29 2000-09-05 General Electric Company Rotary contact assembly for high ampere-rated circuit breakers
US6166344A (en) 1999-03-23 2000-12-26 General Electric Company Circuit breaker handle block
US6172584B1 (en) 1999-12-20 2001-01-09 General Electric Company Circuit breaker accessory reset system
US6175288B1 (en) 1999-08-27 2001-01-16 General Electric Company Supplemental trip unit for rotary circuit interrupters
US6184761B1 (en) 1999-12-20 2001-02-06 General Electric Company Circuit breaker rotary contact arrangement
US6188036B1 (en) 1999-08-03 2001-02-13 General Electric Company Bottom vented circuit breaker capable of top down assembly onto equipment
US6204743B1 (en) 2000-02-29 2001-03-20 General Electric Company Dual connector strap for a rotary contact circuit breaker
US6211757B1 (en) 2000-03-06 2001-04-03 General Electric Company Fast acting high force trip actuator
US6211758B1 (en) 2000-01-11 2001-04-03 General Electric Company Circuit breaker accessory gap control mechanism
US6215379B1 (en) 1999-12-23 2001-04-10 General Electric Company Shunt for indirectly heated bimetallic strip
US6218917B1 (en) 1999-07-02 2001-04-17 General Electric Company Method and arrangement for calibration of circuit breaker thermal trip unit
US6218919B1 (en) 2000-03-15 2001-04-17 General Electric Company Circuit breaker latch mechanism with decreased trip time
US6225881B1 (en) 1998-04-29 2001-05-01 General Electric Company Thermal magnetic circuit breaker
US6229413B1 (en) 1999-10-19 2001-05-08 General Electric Company Support of stationary conductors for a circuit breaker
US6232570B1 (en) 1999-09-16 2001-05-15 General Electric Company Arcing contact arrangement
US6232856B1 (en) 1999-11-02 2001-05-15 General Electric Company Magnetic shunt assembly
US6232859B1 (en) 2000-03-15 2001-05-15 General Electric Company Auxiliary switch mounting configuration for use in a molded case circuit breaker
US6239398B1 (en) 2000-02-24 2001-05-29 General Electric Company Cassette assembly with rejection features
US6239677B1 (en) 2000-02-10 2001-05-29 General Electric Company Circuit breaker thermal magnetic trip unit
US6239395B1 (en) 1999-10-14 2001-05-29 General Electric Company Auxiliary position switch assembly for a circuit breaker
US6252365B1 (en) 1999-08-17 2001-06-26 General Electric Company Breaker/starter with auto-configurable trip unit
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Also Published As

Publication number Publication date
FR2596576B1 (fr) 1988-05-27
FR2596576A1 (fr) 1987-10-02
CN1014371B (zh) 1991-10-16
KR950003869B1 (ko) 1995-04-20
KR870009421A (ko) 1987-10-26
CN87102311A (zh) 1987-10-07
IN168698B (zh) 1991-05-18
CA1289605C (en) 1991-09-24
US4748304A (en) 1988-05-31
JPS62234826A (ja) 1987-10-15
DE3779470D1 (de) 1992-07-09
EP0239460A1 (fr) 1987-09-30

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