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EP0702387A1 - Mehrpoliger Leistungsschalter mit verminderter Betriebstemperatur - Google Patents

Mehrpoliger Leistungsschalter mit verminderter Betriebstemperatur Download PDF

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Publication number
EP0702387A1
EP0702387A1 EP95114334A EP95114334A EP0702387A1 EP 0702387 A1 EP0702387 A1 EP 0702387A1 EP 95114334 A EP95114334 A EP 95114334A EP 95114334 A EP95114334 A EP 95114334A EP 0702387 A1 EP0702387 A1 EP 0702387A1
Authority
EP
European Patent Office
Prior art keywords
current
pole
poles
circuit breaker
parallel
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Withdrawn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
EP95114334A
Other languages
English (en)
French (fr)
Inventor
William George Eberts
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.)
Eaton Corp
Original Assignee
Eaton Corp
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 Eaton Corp filed Critical Eaton Corp
Publication of EP0702387A1 publication Critical patent/EP0702387A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/1045—Multiple circuits-breaker, e.g. for the purpose of dividing current or potential drop

Definitions

  • This invention relates to circuit breakers and in particular to multipole circuit breakers having at least some of the poles connected in parallel to reduce the operating temperature of the breaker.
  • Multipole circuit breakers are used to provide protection in multi-phase electrical systems. For instance, three pole circuit breakers are used to separately interrupt current in the three phases of a three-phase electrical system. Often, four pole circuit breakers are used to interrupt current in all four conductors of a three-phase electrical system having a ground or neutral conductor in addition to the three-phase conductors.
  • circuit breakers Users and manufacturers of circuit breakers are always interested in the possibility of being able to increase the current rating of a particular size circuit breaker, or to reduce the size, and therefore the cost, of the circuit breaker, while maintaining a given current rating.
  • One of the factors affecting the current carrying capacity of circuit breakers is the operating temperature reached. The current flowing through the circuit breaker with the contacts closed produces joule heating which raises the operating temperature.
  • the poles of a multipole circuit breaker are mounted side-by-side in a housing so that there are inner poles and outer poles.
  • the center pole is an inner pole flanked by two outer poles.
  • the inner poles run hotter than the outer poles as they are sandwiched between the outer poles which are also generating heat.
  • the inner poles become the limiting factor on the thermal rating of the circuit breaker.
  • the circuit breaker can be made to run cooler by making the current carrying parts larger.
  • the dimensions of the circuit breaker are dictated by standardized dimensions of the panel boards in which the circuit breakers are typically mounted.
  • the multipole circuit breaker in which at least one set of at least two poles are connected in parallel to one of the conductors of an electric power distribution system.
  • the multipole circuit breaker includes at least three poles mounted side-by-side in a housing to form at least one inner pole and at least two outer poles, with the at least one set of at least two poles including an inner pole and an outer pole.
  • a standard four pole circuit breaker can be used with a three-phase system, or a three pole circuit breaker can be used in a single phase (two conductor) system in accordance with the invention.
  • the two inner poles are connected in parallel to one conductor and the two outer poles are connected separately to the other two conductors.
  • Such an arrangement can be used with a four wire system where, as is typical in the United States, the neutral or ground fourth conductor is not switched.
  • the center pole and one of the outer poles are connected in parallel to one conductor in the electrical distribution system and the other outer pole is connected to the other conductor.
  • the invention can be used with circuit breakers having an electronic trip unit, or a thermal-magnetic trip.
  • the current sensors for the two parallel connected poles are connected in parallel to the electronic trip unit.
  • the electronic trip unit sees the sum of the currents for the poles connected in parallel, the same total current it would see if a single pole were used.
  • the current/time characteristic for the thermal-magnetic device on the poles connected in parallel are selected so that they collectively substantially match the current/time characteristics of the thermal-magnetic devices on the other poles connected singly to a conductor in the electric power distribution system.
  • the invention is directed to: a multipole circuit breaker for interrupting current in a given number of separate conductors in an electric power distribution system, said circuit breakers comprising: a plurality of poles, wherein said plurality is greater than said given number, each said pole having separable contacts for interrupting current therethrough; common means for opening and closing said separable contacts of said plurality of poles substantially together; and connecting means connecting said poles to said conductors with at least one set of at least two of said plurality of poles connected in parallel to one of said given number of conductors.
  • a circuit breaker 1 is connected in a four wire electrical distribution system 3 having three-phase conductors 5, 7 and 9 for phases A. B and C, and a fourth conductor 11 for the neutral N.
  • the circuit breaker 1 has four poles 131 to 134 each having separable contacts 151 to 154.
  • Connections 17 connect the four pole circuit breaker 1 for interruption of current in the three-phase conductors 5, 7, and 9 of the electric distribution system 3. These connections 17 include line side terminals 191 to 194 and loadside terminals 211 to 214.
  • the lineside terminal 191 and loadside terminal 211 of the first pole 131 of the circuit breaker 1 are connected to the conductor 5 of the electrical system 3.
  • the connections 17 further include connection or jumper bars 23 connecting the lineside terminals 192 and 193 to the lineside of conductor 7 and connecting the loadside terminals 212 and 213 to the loadside conductor 7.
  • the inner poles 132 and 133 are connected in parallel in the conductor 7 while the outer poles 131 and 134 are connected separately in the conductors 5 and 9 respectively.
  • the poles 132 and 133 form at least one set of at least two of a plurality of poles of the circuit breaker 1 which are connected in parallel to one of a given number of conductors (3) in the electrical system 3. It will be noted that the fourth, neutral conductor 11 is not switched by the circuit breaker 1.
  • FIG 2 illustrates another embodiment of the invention in which the multipole circuit breaker 1' is connected in an electrical system 3' having a line conductor L 25 and a neutral (N) conductor 27. Elements similar to those in the circuit breaker 1 of Figure 1 are given like reference characters primed.
  • connections 17' include connector bars 23' the connecting the lineside terminals 19'1 of the first pole 13'1 and the lineside terminal 19'2 of the second pole 13 ' 2 to the lineside of the line conductor 25. Additional connector bars 23' connect the loadside terminals 21'1 and 21'2 of these poles to the loadside of the conductor 25.
  • the third and fourth poles 13'3 and 13'4 are connected by connecting bars 23' to the lineside and loadside of the neutral conductor 27.
  • one inner pole 13'2 is connected in parallel with an adjacent one of the outer poles 13'1 in the conductor 25, while the other inner pole 13'3 is connected in parallel with the adjacent other outer pole 13'4 in the other conductor 27.
  • the multipole circuit breaker 1'' is a three pole circuit breaker having 13''1 to 13''3 connected in an electrical distribution system having two conductors, a line (L) conductor 29 and a neutral (N) conductor 31.
  • the inner (or center) pole 13''2 is connected in parallel with one of the outer poles 13''1 in the conductor 29 by the connecting bars 23''.
  • the other outer pole 13''3 is connected in the other conductor 31.
  • FIG 4 illustrates schematically the structure of the circuit breaker 1 of Figure 1.
  • This four pole circuit breaker 1 has a housing 33 made of an electrically insulative material.
  • the housing 33 has partitions 35 forming four compartments 371 to 374.
  • the four poles 131 to 134 are mounted in the compartments 371 to 374 respectively side-by-side so that the poles 132 and 133 are inner poles which are flanked by the outer poles 131 and 134.
  • the separable contacts 151 to 154 associated respectively with each of the poles are operated together by a common operator 39 which includes an electronic trip unit 41.
  • the common operator 39 also includes sensors for sensing current in the respective poles in the form of current transformers 431 to 434.
  • Input leads 451 to 454 provide the current sensed by the current transformers 431 to 434 to the electronic trip unit 41.
  • the leads 452 and 453 connect the current transformers 432 and 433 to the electronic trip unit in parallel, while the leads 451 and 454 connect the associated current transformers 431 and 434 to the electronic trip unit separately.
  • the electronic trip unit 41 monitors the sensed current provided by the current transformers 43 and trips the circuit breaker to open the separable contacts 15 in response to selected current/time characteristics.
  • the phase currents are auctioneered with the electronic trip unit responding to the phase current of greatest magnitude. Connecting poles 132 and 133 in parallel splits the current of the phase to which they are connected to.
  • FIG. 5 illustrates schematically the structure of the circuit breaker 1' shown in Figure 2.
  • the circuit breaker 1' has an electrically insulating housing 33' which is divided by partitions 35' into four compartments 37'1 to 37'4 in which the poles 13'1 to 13'4 are mounted side-by-side.
  • the common operator 39' in the circuit breaker 1' includes thermal-magnetic devices 471 to 474 in each of the respective poles 13'1 to 13'4.
  • the thermal-magnetic device 47 includes a bi-metal which responds to persistent overcurrents to rotate a trip bar 49 which in turn operates a spring operated mechanism 51 which trips the contacts 15'1 to 15'4 open.
  • thermal-magnetic device 47 Higher overcurrents through the thermal-magnetic device 47 generates a magnetic field which actuates an armature within the thermal-magnetic device 47 to rotate the trip bar 49 and open the contacts 15.
  • the thermal-magnetic devices 47 respond to a selected current/time characteristic which generates the thermal and magnetic trips.
  • the poles 13'1 and 13'2 are connected in parallel while the poles 13'3 and 13'4 are also connected in parallel. With this arrangement, the currents through each of the poles is ideally reduced in half so that the current/time characteristics of all of the poles can be set the same.
  • the circuit breaker 1' could also be configured for use in a three conductor system as is the case with the circuit breaker 1 in Figure 4.
  • the two inner poles 13'2 and 13'3 would be connected in parallel and the two outer poles 13'1 and 13'4 would be connected separately to the second and third conductors of the electrical distribution system.
  • the current/time characteristics of the thermal-magnetic devices 472 and 473 would be selected such that collectively they would match the current/time characteristics of the thermal-magnetic devices 471 and 474. This could be accomplished by selecting the current/time characteristics of the thermal-magnetic devices 472 and 473 so that they respond to half the current of the devices 471 and 474 in the same amount of time.
  • the connecting bars 23 connecting the appropriate poles in parallel have been shown external to the circuit breaker housing 33. Alternatively, such connections could be made inside the circuit breaker housing. However, the external arrangement shown is preferred because it provides for better cooling and does not require changed in the structure of the circuit breaker. In fact, in the case of a multipole circuit breaker with an electronic trip unit, the only change required to the conventional circuit breaker is the connection in parallel of the current transformers associated with the parallel connected poles. The absence of the fourth current input does not affect the operation of the electronic trip unit. However, if desired, the four pole trip unit could be replaced with the three pole electronic trip unit in the case of the configuration shown in Figure 4, or with a two pole electronic trip unit in the case of the configuration shown in Figure 2.

Landscapes

  • Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP95114334A 1994-09-16 1995-09-12 Mehrpoliger Leistungsschalter mit verminderter Betriebstemperatur Withdrawn EP0702387A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US30802994A 1994-09-16 1994-09-16
US308029 1994-09-16

Publications (1)

Publication Number Publication Date
EP0702387A1 true EP0702387A1 (de) 1996-03-20

Family

ID=23192231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114334A Withdrawn EP0702387A1 (de) 1994-09-16 1995-09-12 Mehrpoliger Leistungsschalter mit verminderter Betriebstemperatur

Country Status (4)

Country Link
EP (1) EP0702387A1 (de)
JP (1) JPH08195159A (de)
CA (1) CA2158415A1 (de)
ZA (1) ZA957698B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1775744A2 (de) * 2005-10-14 2007-04-18 Moeller GmbH Dreipoliger Leistungsschalter und Verfahren zu seiner Herstellung
EP2996130A1 (de) * 2014-09-11 2016-03-16 Schneider Electric Industries SAS Schutzschalter
CN111527576A (zh) * 2017-12-27 2020-08-11 Ls电气株式会社 直流断路器
CN112485655A (zh) * 2020-10-29 2021-03-12 国网湖北省电力有限公司电力科学研究院 一种变电站断路器跳合闸回路精准监测装置与方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2101060B2 (de) * 1971-01-11 1976-07-01 Licenti a Patent-Verwaltungs-GmbH, 6000 Frankfurt Anordnung von aneinandergereihten einpoligen selbstschaltern
EP0117094A1 (de) * 1983-02-18 1984-08-29 Heinemann Electric Company Schutzschalter mit parallelgeschalteten Strombahnen
DE3515158A1 (de) * 1985-04-26 1986-11-06 Lindner Gmbh, Fabrik Elektrischer Lampen Und Apparate, 8600 Bamberg Hochampere-ueberstromschutzschalter
EP0670585A2 (de) * 1994-03-01 1995-09-06 Heinrich Kopp Ag Leitungsschutzschalter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2101060B2 (de) * 1971-01-11 1976-07-01 Licenti a Patent-Verwaltungs-GmbH, 6000 Frankfurt Anordnung von aneinandergereihten einpoligen selbstschaltern
EP0117094A1 (de) * 1983-02-18 1984-08-29 Heinemann Electric Company Schutzschalter mit parallelgeschalteten Strombahnen
DE3515158A1 (de) * 1985-04-26 1986-11-06 Lindner Gmbh, Fabrik Elektrischer Lampen Und Apparate, 8600 Bamberg Hochampere-ueberstromschutzschalter
EP0670585A2 (de) * 1994-03-01 1995-09-06 Heinrich Kopp Ag Leitungsschutzschalter

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1775744A2 (de) * 2005-10-14 2007-04-18 Moeller GmbH Dreipoliger Leistungsschalter und Verfahren zu seiner Herstellung
DE102005049181A1 (de) * 2005-10-14 2007-04-19 Moeller Gmbh Dreipoliger Leistungsschalter und Verfahren zu seiner Herstellung
EP1775744A3 (de) * 2005-10-14 2008-11-05 Moeller GmbH Dreipoliger Leistungsschalter und Verfahren zu seiner Herstellung
DE102005049181B4 (de) * 2005-10-14 2009-08-27 Moeller Gmbh Dreipoliger Leistungsschalter und Verfahren zu seiner Herstellung
EP2996130A1 (de) * 2014-09-11 2016-03-16 Schneider Electric Industries SAS Schutzschalter
FR3025934A1 (fr) * 2014-09-11 2016-03-18 Schneider Electric Ind Sas Disjoncteur
US9779903B2 (en) 2014-09-11 2017-10-03 Schneider Electric Industries Sas Circuit breaker having equalized poles
CN111527576A (zh) * 2017-12-27 2020-08-11 Ls电气株式会社 直流断路器
EP3734631A4 (de) * 2017-12-27 2021-09-01 LS Electric Co., Ltd. Gleichstromschutzschalter
US11430621B2 (en) 2017-12-27 2022-08-30 Ls Electric Co., Ltd. DC circuit breaker
CN112485655A (zh) * 2020-10-29 2021-03-12 国网湖北省电力有限公司电力科学研究院 一种变电站断路器跳合闸回路精准监测装置与方法
CN112485655B (zh) * 2020-10-29 2022-05-31 国网湖北省电力有限公司电力科学研究院 一种变电站断路器跳合闸回路精准监测装置与方法

Also Published As

Publication number Publication date
ZA957698B (en) 1996-04-24
JPH08195159A (ja) 1996-07-30
CA2158415A1 (en) 1996-03-17

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