EP2750156A1 - Elektrischer Schaltkreis eines selektiven Leistungsschalters - Google Patents

Elektrischer Schaltkreis eines selektiven Leistungsschalters Download PDF

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Publication number
EP2750156A1
EP2750156A1 EP12306687.0A EP12306687A EP2750156A1 EP 2750156 A1 EP2750156 A1 EP 2750156A1 EP 12306687 A EP12306687 A EP 12306687A EP 2750156 A1 EP2750156 A1 EP 2750156A1
Authority
EP
European Patent Office
Prior art keywords
main
circuit
thermal actuator
contacts
actuator
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Withdrawn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
EP12306687.0A
Other languages
English (en)
French (fr)
Inventor
Nikola Puh
Stéphane Eloy
David Weil
Sébastien Brossard
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.)
Hager Electro SAS
Original Assignee
Hager Electro SAS
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 Hager Electro SAS filed Critical Hager Electro SAS
Priority to EP12306687.0A priority Critical patent/EP2750156A1/de
Priority to CN201310757112.7A priority patent/CN103972000B/zh
Publication of EP2750156A1 publication Critical patent/EP2750156A1/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Withdrawn legal-status Critical Current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
    • H01H71/1081—Modifications for selective or back-up protection; Correlation between feeder and branch circuit breaker
    • 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
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/42—Impedances connected with contacts
    • 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
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/46—Means for extinguishing or preventing arc between current-carrying parts using arcing horns

Definitions

  • the present invention relates to an electrical circuit of a selective type of circuit breaker, the function of which is to ensure as much as possible the continuity of service in an electrical installation, in the event of a short circuit occurring downstream therein. It is therefore an electrical device disposed upstream of an installation preferably comprising several branches or lines themselves equipped with their own type circuit breaker protection devices, the upstream selective circuit breaker being provided to ensure the selectivity of said protective devices.
  • Selective circuit breakers are generally based on two parallel electrical circuits, a main circuit that is similar to the circuit integrated circuit to all circuit breakers, and therefore comprises a thermal actuator protecting the line against overloads and a magnetic actuator acting in case of a short circuit, these two actuators being provided to ultimately cause the opening of a movable contact for example using a mechanical lock.
  • the second circuit referred to as the secondary circuit, is designed to take over when the main circuit opens and comprises a secondary contact, a resistor intended to limit the fault current, and a secondary thermal actuator which acts on the main and secondary contacts. , via a lock in case of persistence of the fault which led to the opening of the main circuit.
  • the secondary circuit actually implements a predetermined time delay, leaving the breaker of the branch in default the ability to play its role without the other branches are concerned, and activating a second level of security if said circuit breaker does not work.
  • circuit breakers In selective circuit breakers that are commercialized to date, parallel electrical circuit solutions are implemented in several ways.
  • circuit breakers in which, when a fault occurs on a line, the main circuit actuators trigger a main lock which opens the contacts, a third circuit, powered by the neutral line, coming to reset the main lock after disappearance of the defect, after a predetermined duration. If the fault persists, the thermal actuator of the secondary circuit permanently cuts the three circuits via a secondary lock, and the selective circuit breaker can only be reset manually.
  • the contact of the main circuit is a normally closed contact which is kept temporarily open via the magnetic function in the event of a short circuit. The current then flows only into the secondary circuit. If the fault persists, the thermal actuator of the secondary circuit triggers a single lock which permanently cuts the protected line.
  • the first solution is dependent on the neutral, and therefore, it is more sensitive to the quality of the wiring. Moreover, it requires a reset coil, in order to reset the main lock after disappearance of the defect.
  • the main thermal actuator in the event that the main thermal actuator is located outside the secondary branch, it is subjected to the short-circuit current until full opening of the main contact by extinction of the arc.
  • the bimetallic which acts as main thermal actuator is therefore not preserved, under extreme conditions of current that obelient its ability to operate properly over a long period, these conditions also limiting the choice of materials for its constitution.
  • the present invention overcomes these problems, and proposes a simple solution, in particular based on a single mechanical lock, and whose electrical design results in preserving the bimetallic strip forming the main thermal actuator in the event of a short-circuit, thereby corollating a selection less rigorous possible materials for said bimetal.
  • the electronic circuit of the selective circuit breaker of the invention conventionally comprising in parallel a main branch provided with a pair of fixed and movable contacts and a secondary branch comprising in series a resistor, a secondary thermal actuator and a pair of secondary contacts, also comprises a main magnetic actuator and a main thermal actuator connected to the line to be protected outside the two branches, is mainly characterized in that an arc conduction plate is placed so that one of its ends is at the level of the pair of main contacts to derive the arc created in case of opening of said main contacts, and the other end is connected upstream of the main thermal actuator.
  • the main thermal actuator is a bimetallic strip.
  • the main magnetic actuator is a coil actuator and movable magnetic core, the latter can exert mechanical energy to change the state of the contacts.
  • the secondary thermal actuator is preferably a bimetallic strip.
  • the complete electrical circuit of the invention is shown, placed on a phase.
  • the main circuit or main branch (1) is shown in bold, while the secondary circuit or secondary branch (2) is shown in thinner line.
  • said main circuit (1) merges with the main line protected by the protection device.
  • a main coil (3) and a main bimetallic strip (4) In the upstream part of the main line are a main coil (3) and a main bimetallic strip (4), at least partially constituting the magnetic and thermal actuators.
  • Mechanical energy transfers are shown in the various figures by dashed lines, to a component pointed by the terminal arrow.
  • the main coil (3) is connected to the main movable contact (5) by a mechanical link capable of temporarily exerting, and under certain conditions, an action on the main movable contact (5) in order to move it away from the main fixed contact (6), as shown in figure 1 , which therefore represents the open line.
  • the main bimetallic strip (4) is itself able to exert a mechanical action on a single mechanical lock (7) allowing the opening of the main contact (5).
  • This mechanical lock (7) is also actuable by a secondary bimetallic strip (9), connected in series in the secondary branch (2).
  • the latter finally comprises a resistor (10) also connected in series with the secondary contact (8) and the secondary bimetallic strip (9).
  • this circuit further comprises an arc conduction plate (11) whose free end is located at the level of the main movable (5) and fixed (6) main contact pair, respectively. where they are separated from each other, where arises the electric arc that is created when the movable contact (5) away from the fixed contact (6), the arc is then blown to said sheet of conduction (11).
  • the other end of the arc conduction plate (11) is connected to the main line between the main coil (3) and bimetallic strip (4).
  • the arc (12) then moves in the direction of the end of the arc conduction plate (11) and eventually develops between the stationary contact (6) and the end of said conduction plate. arc (11), as illustrated in figure 3 .
  • the path of the current always illustrated by the arrows, changes, now passing through the arc conduction plate (11) to the main coil (3), and thus avoiding the main bimetal ( 4).
  • the value chosen for said resistor (10), having an effect on the current values in the secondary branch (2), makes it possible to set in advance the triggering time of the mechanical lock (7) via the bimetallic strip (9).
  • the short-circuit current limited by said resistor (10), however, is high enough that the magnetic actuator, of which the coil (3) is part, maintains the main movable contact (5) away from the main fixed contact.
  • the circuit breaker located downstream of the main circuit breaker of the invention, and which manages the branch in which appeared the short circuit, must trip, which stops the current of the short circuit in the circuit shown, and allows the closure of the main line, the movable contact (5) returning bearing against the fixed contact (6) in the absence of reverse bias by the main coil (3).
  • the bimetallic strip (9) of the circuit of the secondary branch (2) actuates the mechanical lock (7) and causes the selective main circuit breaker to trip. All circuits or power lines located downstream are then cut off.

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  • Breakers (AREA)
EP12306687.0A 2012-12-27 2012-12-27 Elektrischer Schaltkreis eines selektiven Leistungsschalters Withdrawn EP2750156A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12306687.0A EP2750156A1 (de) 2012-12-27 2012-12-27 Elektrischer Schaltkreis eines selektiven Leistungsschalters
CN201310757112.7A CN103972000B (zh) 2012-12-27 2013-12-27 用于选择性断路器的电路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12306687.0A EP2750156A1 (de) 2012-12-27 2012-12-27 Elektrischer Schaltkreis eines selektiven Leistungsschalters

Publications (1)

Publication Number Publication Date
EP2750156A1 true EP2750156A1 (de) 2014-07-02

Family

ID=47664098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12306687.0A Withdrawn EP2750156A1 (de) 2012-12-27 2012-12-27 Elektrischer Schaltkreis eines selektiven Leistungsschalters

Country Status (2)

Country Link
EP (1) EP2750156A1 (de)
CN (1) CN103972000B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3050335B1 (fr) * 2016-04-14 2020-09-25 Hager Electro Sas Systeme de detection d'une surcharge et appareil electrique differentiel de protection de ligne electrique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2437059A3 (fr) * 1978-09-21 1980-04-18 Licentia Gmbh Declencheur bimetallique pour disjoncteurs electriques
DE3133221A1 (de) * 1981-08-21 1983-03-03 Siemens AG, 1000 Berlin und 8000 München "leitungsschutzschalter"
DE102006028696A1 (de) * 2006-06-22 2007-12-27 Siemens Ag Leistungsschalter oder Leitungsschutzschalter
DE102008021026A1 (de) * 2007-04-28 2008-11-06 Abb Ag Installationsschaltgerät

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2437059A3 (fr) * 1978-09-21 1980-04-18 Licentia Gmbh Declencheur bimetallique pour disjoncteurs electriques
DE3133221A1 (de) * 1981-08-21 1983-03-03 Siemens AG, 1000 Berlin und 8000 München "leitungsschutzschalter"
DE102006028696A1 (de) * 2006-06-22 2007-12-27 Siemens Ag Leistungsschalter oder Leitungsschutzschalter
DE102008021026A1 (de) * 2007-04-28 2008-11-06 Abb Ag Installationsschaltgerät

Also Published As

Publication number Publication date
CN103972000B (zh) 2017-04-12
CN103972000A (zh) 2014-08-06

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