EP0903765B1 - Disjoncteur - Google Patents

Disjoncteur Download PDF

Info

Publication number
EP0903765B1
EP0903765B1 EP98307415A EP98307415A EP0903765B1 EP 0903765 B1 EP0903765 B1 EP 0903765B1 EP 98307415 A EP98307415 A EP 98307415A EP 98307415 A EP98307415 A EP 98307415A EP 0903765 B1 EP0903765 B1 EP 0903765B1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
core
housing
output
primary housing
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
EP98307415A
Other languages
German (de)
English (en)
Other versions
EP0903765A2 (fr
EP0903765A3 (fr
Inventor
Dante Bagalini
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.)
Circuit Breakers Ind Ltd
Original Assignee
Circuit Breakers Ind Ltd
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 Circuit Breakers Ind Ltd filed Critical Circuit Breakers Ind Ltd
Publication of EP0903765A2 publication Critical patent/EP0903765A2/fr
Publication of EP0903765A3 publication Critical patent/EP0903765A3/fr
Application granted granted Critical
Publication of EP0903765B1 publication Critical patent/EP0903765B1/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
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • H01H2083/148—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer with primary windings formed of rigid copper conductors

Definitions

  • THIS INVENTION relates to a circuit breaker. More particularly, the invention relates to a circuit breaker incorporating an earth leakage facility.
  • a circuit breaker which includes
  • a circuit breaker according to the preamble of claim 1 is known from FR 2 681 725.
  • the primary housing may be dimensioned to be the same size as a housing and with the same size arc chutes of a circuit breaker of the same rating but excluding an earth leakage facility.
  • the term "same size” refers to a primary housing of a circuit breaker which has the same dimensions, interior capacity and layout as a housing of a conventional circuit breaker, i.e. a circuit breaker without an earth leakage facility, of the same rating. Corresponding words thus have corresponding means.
  • the primary housing may include a base having a floor bounded by a side wall portion, the core lying in a plane extending parallel to the floor.
  • the core may be a strip-wound core of a nanocrystalline alloy.
  • the core may incorporate shielding material and insulating material and may be dimensioned to be accommodated in a recess in the primary housing.
  • each electrically conductive element may be in the form of a spacer of an electrically conductive material, the spacers projecting from the conductors through the opening of the core to be surrounded by the core.
  • An output lug, of an electrically conductive material, may be mounted on each spacer.
  • Each output conductor may be fastened to its associated spacer and output lug by a fastening means.
  • the current sensing circuitry may include a current sensing means.
  • the current sensing means may comprise a current transformer having a winding surrounding the output lugs.
  • the current transformer and the earth leakage core may be connected to their appropriate circuitry which is contained in the secondary housing.
  • the secondary housing may form a unit which is removably received in the primary housing of the circuit breaker.
  • the unit may incorporate a tripping device which acts on the operating handle of the circuit breaker.
  • the invention extends also to a circuit breaker which includes
  • the circuit breaker 10 comprises a primary housing 12, the base of which is illustrated in the drawings.
  • the housing 12 is the same size as a housing of a circuit breaker of the same rating but excluding an earth leakage facility.
  • An operating mechanism 14 ( Figure 5) and handle arrangement (not shown) of conventional size and rating are mounted via a frame in the housing 12, an edge of the frame being indicated schematically at 14.1 in Figure 1 of the drawings.
  • the housing 12 is effectively divided into three parts, the operating mechanism 14 being contained within a central part 12.1 of the housing 12, an arc chute arrangement 15 being arranged in a part 12.2 on one side of the operating mechanism 14 with output conductors 16 of the operating mechanism 14 extending into a further part 12.3 on an opposed side of the operating mechanism 14.
  • the base of the housing 12 has a floor 18 ( Figure 4) surrounded by a side wall 19.
  • the circuit breaker 10 includes an earth leakage facility having an oval-shaped core 20 illustrated in Figure 3 of the drawings.
  • the core 20 is a strip-wound core of a nanocrystalline alloy called VITROPERM 800F (Vitroperm 800F is a registered trade mark of Vacuumschmelze GmbH of Hanau, Germany).
  • VITROPERM 800F is a registered trade mark of Vacuumschmelze GmbH of Hanau, Germany.
  • the core 20 lies in a plane parallel to the floor 18 of the base of the housing 12 in the part 12.3 of the housing 12.
  • An electrical spacer 22 ( Figure 1) is mounted on each output conductor 16 to protrude through an opening 24 in the core 20.
  • Each spacer 22 has an output lug 26 mounted thereon, the output lugs 26 being of an electrically conductive material.
  • Each output lug 26 is aligned with an output element 28 to form an output terminal 30 of the circuit breaker 10, each terminal 30 being accommodated in the part 12.3 of the housing 12.
  • Each conductor 16, spacer 22 and output lug 26 are fastened together by a bolt and nut combination 44 to hold the assemblies so formed together.
  • the circuit breaker 10 includes a current sensing means 32 for sensing current through the output terminals 30 of the circuit breaker 10.
  • the current sensing means 32 includes a current transformer 33 having a winding 34 extending about the output lugs 26.
  • An output from the current transformer 33 is connected to current sensing circuitry illustrated schematically in Figure 1 by a printed circuit board 36.
  • an output from the core 20 of the earth leakage facility is connected to earth leakage sensing circuitry indicated schematically in Figure 1 by a printed circuit board 38.
  • the current sensing circuitry 36 and the earth leakage sensing circuitry 38 are both connected to a low energy shunt trip 40 which, in a conventional fashion, operates a tripping mechanism (not shown), the tripping mechanism, in turn, being connected to the operating handle of the operating mechanism 14 of the circuit breaker 10.
  • the current transformer 33, the current sensing circuitry 36, the earth leakage sensing circuitry 38 and the shunt trip 40 are contained within a secondary housing 42 which is received in the part 12.3 of the housing 12 of the circuit breaker 10.
  • the housing 42 is mounted above the core 20 in the part 12.3 of the housing 12 such that the tripping mechanism engages the operating handle of the circuit breaker 10.
  • the arrangement of the oval-shaped core 20 parallel to the floor 18 of the base of the housing 12, and mounting of the secondary housing 42 above the core 12 facilitates the use of a housing 12 which has the same size as a conventional circuit breaker of the same rating but excluding an earth leakage facility.
  • the output conductors 16 from the operating mechanism of the circuit breaker 10 are arranged with their usual spacing so that there is no need to provide additional insulation about the output conductors 16 nor is there a need to reduce their rating to overcome heating problems.
  • the need to reduce the arc chutes and, as a result, reducing the breaking capacity of the circuit breaker is obviated.
  • circuit breaker 10 has been described with reference to electronic current sensing, it will be appreciated that the same configuration of earth leakage sensing facility can be also used with thermal-magnetic current sensing devices or hydraulic-magnetic current sensing devices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Breakers (AREA)
  • Mechanisms For Operating Contacts (AREA)

Claims (11)

  1. Disjoncteur qui comprend :
    un boítier principal (12) contenant un mécanisme de commande (14), le mécanisme de commande comportant une pluralité de conducteurs de sortie (16) ;
    des moyens de détection de fuite à la terre, caractérisé en ce qu'il comprend également un noyau de forme ovale (20) monté dans le boítier principal ;
    des éléments conducteurs électriques, montés sur les conducteurs de sortie et faisant saillie à travers l'ouverture de forme ovale (24) délimitée par le noyau ; et
    un circuit de détection de courant (36) et un circuit de détection de fuite à la terre (38) incorporés dans un boítier secondaire (42), le boítier secondaire étant logé à l'intérieur du boítier principal.
  2. Disjoncteur selon la revendication 1, dans lequel le boítier principal est dimensionné pour avoir les mêmes dimensions comme boítier et avec les boítes de soufflage de même taille qu'un disjoncteur de même caractéristique mais en excluant un équipement de fuite à la terre.
  3. Disjoncteur selon la revendication 1 ou 2, dans lequel le boítier principal comprend une base avec un fond délimité par une partie de paroi latérale, le noyau étant situé dans un plan s'étendant parallèlement au fond.
  4. Disjoncteur selon l'une quelconque des revendications précédentes, dans lequel le noyau est un noyau à enroulement plat d'un alliage nanocristallin.
  5. Disjoncteur selon la revendication 4, dans lequel le noyau comporte du matériau de blindage et du matériau isolant.
  6. Disjoncteur selon l'une quelconque des revendications précédentes, dans lequel chaque élément conducteur électrique est réalisé sous la forme d'une entretoise en un matériau conducteur de l'électricité, les entretoises faisant saillie à travers l'ouverture du noyau de manière à être entouré par le noyau.
  7. Disjoncteur selon la revendication 6, dans lequel une cosse de sortie est montée sur chaque entretoise.
  8. Disjoncteur selon la revendication 7, dans lequel chaque conducteur de sortie est fixé à son entretoise et à sa cosse de sortie associées par des moyens de fixation.
  9. Disjoncteur selon la revendication 7 ou 8, dans lequel le circuit de détection de courant comprend des moyens de détection de courant.
  10. Disjoncteur selon la revendication 9, dans lequel les moyens de détection de courant comprennent un transformateur de courant comportant un enroulement entourant les cosses de sortie.
  11. Disjoncteur selon l'une quelconque des revendications précédentes, dans lequel le boítier secondaire est logé de manière amovible dans le boítier primaire.
EP98307415A 1997-09-19 1998-09-14 Disjoncteur Expired - Lifetime EP0903765B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA978466 1997-09-19
ZA9708466 1997-09-19

Publications (3)

Publication Number Publication Date
EP0903765A2 EP0903765A2 (fr) 1999-03-24
EP0903765A3 EP0903765A3 (fr) 1999-11-17
EP0903765B1 true EP0903765B1 (fr) 2002-11-13

Family

ID=25586600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98307415A Expired - Lifetime EP0903765B1 (fr) 1997-09-19 1998-09-14 Disjoncteur

Country Status (4)

Country Link
EP (1) EP0903765B1 (fr)
JP (1) JPH11185593A (fr)
AT (1) ATE227883T1 (fr)
DE (1) DE69809359T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3069718B1 (fr) * 2017-07-25 2019-08-09 Schneider Electric Industries Sas Appareil de protection electrique differentielle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5276416A (en) * 1991-09-20 1994-01-04 Kabushiki Kaisha Toshiba Circuit breaker
GB9414873D0 (en) * 1994-07-23 1994-09-14 Delta Circuits Protection Current imbalance sensor

Also Published As

Publication number Publication date
DE69809359D1 (de) 2002-12-19
EP0903765A2 (fr) 1999-03-24
ATE227883T1 (de) 2002-11-15
DE69809359T2 (de) 2003-09-04
EP0903765A3 (fr) 1999-11-17
JPH11185593A (ja) 1999-07-09

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