EP0504463B1 - Circuit pour alimentation en courant - Google Patents

Circuit pour alimentation en courant Download PDF

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Publication number
EP0504463B1
EP0504463B1 EP91104457A EP91104457A EP0504463B1 EP 0504463 B1 EP0504463 B1 EP 0504463B1 EP 91104457 A EP91104457 A EP 91104457A EP 91104457 A EP91104457 A EP 91104457A EP 0504463 B1 EP0504463 B1 EP 0504463B1
Authority
EP
European Patent Office
Prior art keywords
contact
branch
contact point
current
circuit arrangement
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
EP91104457A
Other languages
German (de)
English (en)
Other versions
EP0504463A1 (fr
Inventor
Fritz Dipl.-Phys. Pohl
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP91104457A priority Critical patent/EP0504463B1/fr
Priority to AT91104457T priority patent/ATE144075T1/de
Priority to DE59108266T priority patent/DE59108266D1/de
Publication of EP0504463A1 publication Critical patent/EP0504463A1/fr
Application granted granted Critical
Publication of EP0504463B1 publication Critical patent/EP0504463B1/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
    • 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
    • H01H9/465—Shunt circuit closed by transferring the arc onto an auxiliary electrode
    • 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
    • H01H79/00—Protective switches in which excess current causes the closing of contacts, e.g. for short-circuiting the apparatus to be protected

Definitions

  • the invention relates to a circuit arrangement for current limitation, which has a main current path with at least one contact point with an arc extinguishing region and from which a branch is led out to an external connection.
  • a circuit arrangement for current limitation which has a main current path with at least one contact point with an arc extinguishing region and from which a branch is led out to an external connection.
  • Such a structure is initially comparable to a partial structure after a circuit according to US-A-2 924 752 (FIG 2).
  • Pre-machines are intended to support downstream machines in consumer branches or to protect them against overload.
  • Such circuit breakers against overcurrent and short circuit should be selective to downstream circuit breakers with regard to overcurrent and short circuit, so that only the lowest possible part of a network system is switched off, namely the branch in which the short circuit or the cause of the overcurrent is present.
  • Selectivity can be achieved with fuses without difficulty.
  • circuit breakers for example so-called line circuit breakers
  • the selectivity with regard to overcurrent can be implemented relatively easily.
  • the thermal provided for this in practice Triggers can easily be set to different delays, so that the downstream circuit breaker, in the branch of which is the cause of the overcurrent, disconnects the line sooner than the upstream circuit breaker.
  • circuit breakers In practice, however, it is more difficult to establish selectivity with circuit breakers in the event of a short circuit.
  • the magnetic triggers provided for this purpose in practice which are designed to respond particularly quickly, can only be built with particular effort in design and wiring in such a way that first the downstream and then the upstream circuit breaker disconnects the line.
  • circuit breakers are often preferred because of their convenience.
  • the disconnection point or contact point in the main current path is closed again, i.e. through-connected, and the disconnection point in the feeder is opened again (column 9, lines 4-10). If the effect of a short circuit behind the circuit breaker is reduced and a mains voltage builds up again, the current rise in the feeder after various internal circuit measures means that the isolating point in the main current path is switched to conductive again.
  • the threshold value for a reclosure should be defined more precisely than for a reclosure with falling ones Current values, as is known from other proposals, would be possible.
  • Such a reclosure is desirable if the short circuit no longer occurs in a branch, for example if a downstream circuit breaker has disconnected the defective branch.
  • the supply of the intact branches is then ensured. When the contact point in the main current path is open, the power supply to the various downstream branches can be approximately maintained.
  • limiters are based on the principle of additionally limiting the current over a switching path in the event of a shutdown by switching on further current-limiting means. However, no currents are derived from devices that are subordinate to the main current path. Deriving currents (EP: 90 113 093.0) and not only carrying out a current limitation enables further modes of operation, for example the decoupling of an input circuit from the output circuit, which can be particularly important with a larger inductance in the output. Limiters, on the other hand, which are only intended to limit the current in the main current path, are known in a wide variety of designs (for example EP-A-0 350 825). With limiters, the voltage for other distribution branches should be maintained as long as possible.
  • the invention has for its object to develop a circuit arrangement for current limitation which, with selectivity to circuit breakers in downstream branches, enables the input circuit and output circuit to be separated.
  • a circuit arrangement according to claim 1. It has a main current path with at least one contact point with an arc extinguishing region, from which a branch is led out from a contact means to an external connection.
  • the branch is in the area from the electrically conductive Arc plasma is met when opening the contact point is arranged.
  • the voltage on the input side and on the output side of the switching arrangement can be influenced or selected, in each case based on the branch which is led out in the switched-off state. Brief voltage drops and power interruptions are avoided.
  • a circuit arrangement according to claim 2 relates to an interconnection of several main current paths, as illustrated in FIG. 2.
  • the external connection is connected to the main current branch through the arc plasma. Since the arc voltage is, as usual, above the mains voltage and the feeder has a low, complex resistance, in particular a low impedance, in the event of a short circuit at a downstream point to the circuit arrangement, the short-circuit current essentially flows through the feeder.
  • the arc voltage of the circuit arrangement stabilizes the voltage, which is why the current in the feeder does not rise to a certain extent.
  • the feeder divides the total current practically into two partial circuits, into an input-side or transformer-side and into an output-side or consumer-side partial circuit.
  • the contact point, or the contact points, of the main current path are bridged by a parallel branch with a further contact point with a delayed, for example thermal release and current limiting resistor.
  • a contact of the other contact point is controlled by the delayed release.
  • the current limiting resistor in the parallel branch takes over the power supply of the other branches on the consumer or output side for a short time when the contact point is open, i.e. broken.
  • the further contact point which is controlled by the delayed release, ensures that the parallel branch cannot heat up inadmissibly if the current duration is too long.
  • a sensor for current flow in the parallel branch can advantageously apply a restart lock.
  • resistors (92 to 96) for the current limitation desired there are switched on in an earthing circuit in the branches of the quenching plate stacks.
  • the circuit arrangement according to the invention provides for a rapid interruption to limit the current by means of the arc voltage and, in particular, when the input circuit has a low inductance.
  • the voltage for this partial arc between the contact means and the associated contact of the contact point can be set by suitable choice of the arrangement of the contact means in the region of the arc plasma.
  • the voltage can be set by the number of arc sections between the quenching plates. In the case of four partial arcing paths at 25 V, which is customary in practice, a voltage of 100 V results for this example.
  • the inductance on the consumer side has the effect that the short-circuit current in this partial circuit is not abruptly interrupted via the branch becomes.
  • the circuit arrangement can in particular be constructed in such a way that its main current path into the outer conductor, formerly called phase conductor, of a network is switched on and that its branch is connected to the neutral conductor of the network.
  • these can be switched into the outer conductor of a network, the branches being connected to the neutral conductor of the network.
  • circuit arrangement in the event of a short circuit in one branch on the output side, for example in one of several consumer branches, limits the voltage for the other output-side consumer branches to a structurally predetermined value, regardless of the voltage of the total at the Arcing contact point.
  • the circuit arrangement 1 for current limitation has a main current path 2 with a contact point 3.
  • arc quenching plates 5 are arranged in the arc quenching area 4.
  • a branch 7 is led out from a contact means 6 in the region which is fulfilled by the electrically conductive arc plasma when the contact point is opened, to an external connection 8.
  • each of the contact point and the contact means 6 determine the distribution of the voltage on the input side, for example 11, and on the output side, for example 12, measured in each case between the input-side connection 13 and the external connection 8 and the output-side connection 14 and the external connection 8.
  • the contact point 3 has two movable contacts.
  • the circuit arrangement 1 is provided with a parallel branch 15 in which a further contact point 16 and a current limiting resistor 17 are arranged.
  • the further contact point 16 is controlled by a thermal release 18.
  • a supply network with an electrical pole 19 and a neutral conductor 20 is connected to the input-side connection 13, the neutral conductor being connected to the external connection 8 of the branch 7.
  • a distribution with the load branches 21 and 22 is connected to the output-side connection 14.
  • a complex resistor 23 with the real part 24, the resistor and the imaginary part 25, the impedance, is illustrated in the load branch 21.
  • a branch switch 26 is arranged in this consumer branch.
  • consumers 27 are illustrated, which are switched on or off by branch switches, not shown.
  • the resistors with the complex resistor 28 present in the input circuit of the network are shown on the input side 11.
  • circuit arrangement 1 responds, an input-side circuit 29 and an output-side circuit 30 are formed.
  • the outer conductors 31, 32 and 33 are connected to main current paths 2, which are each illustrated by an arcing plate arrangement. They each have a parallel branch 15. Their branches 7 are each connected to the neutral conductor 20.
  • the circuit arrangement serves to provide a three-phase consumer 34, e.g. B. to protect an engine.
  • a sensor for current flow can be arranged, which applies a restart lock to the circuit arrangement serving as a special type of circuit breaker.

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Details Of Television Scanning (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Claims (3)

  1. Montage de limitation de courant, qui comporte un trajet (2) de courant principal ayant au moins un point (3) de contact avec un dispositif (4) d'extinction d'arc électrique, dont un branchement (7) sort d'un moyen (6) de contact vers une borne (8) externe, les voies entre un contact du point de contact et le moyen (6) de contact déterminant la répartition de la tension du côté (11) d'entrée et du côté (12) de sortie du montage par rapport au branchement (7) sorti pendant le processus de coupure,
    caractérisé en ce que
    le point (3) de contact, ou les points de contact, du trajet (2) de courant principal est ou sont pontés par une branche (15) en parallèle comportant un autre point (16) de contact, un déclencheur (18) retardé et une résistance (17) de limitation de courant, un contact de l'autre point (16) de contact étant commandé par le déclencheur (18) retardé et le branchement (7) étant connecté directement au conducteur (20) neutre du réseau.
  2. Montage de limitation de courant qui comporte des trajets (2) de courant principal comportant chacun au moins un point (3) de contact avec une zone (4) d'extinction d'arc électrique aux conducteurs extérieurs d'un réseau, nommé précédemment fil de phase, dont un branchement (7) sort d'un moyen (6) de contact vers une borne (8) externe, les voies entre un contact du point de contact et le moyen (6) de contact déterminant la répartition de la tension du côté entrée (11) et du côté sortie (12) du montage par rapport au branchement (7) sorti pendant le processus de coupure,
    caractérisé en ce que
    le point (3) de contact ou les points de contact, du trajet (2) de courant principal est ou sont pontés par une branche (15) en parallèle comportant un autre point (16) de contact, un déclencheur (18) retardé et une résistance (17) de limitation de courant, un contact de l'autre point (16) de contact étant commandé par le déclencheur retardé (18) et ce branchement (7) étant conneçté directement au conducteur neutre (20) du réseau.
  3. Montage suivant la revendication 1 ou 2,
    caractérisé en ce que
    un capteur de passage de courant alimente, dans la branche (15) en parallèle, un dispositif de réenclenchement empêché.
EP91104457A 1991-03-21 1991-03-21 Circuit pour alimentation en courant Expired - Lifetime EP0504463B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP91104457A EP0504463B1 (fr) 1991-03-21 1991-03-21 Circuit pour alimentation en courant
AT91104457T ATE144075T1 (de) 1991-03-21 1991-03-21 Schaltungsanordnung zur stromversorgung
DE59108266T DE59108266D1 (de) 1991-03-21 1991-03-21 Schaltungsanordnung zur Stromversorgung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91104457A EP0504463B1 (fr) 1991-03-21 1991-03-21 Circuit pour alimentation en courant

Publications (2)

Publication Number Publication Date
EP0504463A1 EP0504463A1 (fr) 1992-09-23
EP0504463B1 true EP0504463B1 (fr) 1996-10-09

Family

ID=8206556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91104457A Expired - Lifetime EP0504463B1 (fr) 1991-03-21 1991-03-21 Circuit pour alimentation en courant

Country Status (3)

Country Link
EP (1) EP0504463B1 (fr)
AT (1) ATE144075T1 (fr)
DE (1) DE59108266D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004019532A1 (de) * 2004-04-22 2005-11-10 Medvetskiy, Oleksandr Leitungsschutzschalter

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4243314C2 (de) * 1992-12-21 1998-08-20 Asea Brown Boveri Strombegrenzender Schalter
DE4309794A1 (de) * 1993-03-25 1994-09-29 Siemens Ag Anordnung zur Freischaltung von Abzweigen eines Niederspannungs-Leitungsnetzes im Kurzschlußfall
FR2912253B1 (fr) * 2007-02-01 2009-03-06 Schneider Electric Ind Sas Dispositif de protection contre les surtensions a contact mobile comprenant des moyens de deconnexions selectifs contre des courts-circuits

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2924752A (en) * 1957-07-12 1960-02-09 Ite Circuit Breaker Ltd Combined circuit breaker and short circuiter
US4184186A (en) * 1977-09-06 1980-01-15 General Electric Company Current limiting device for an electric power system
DE3316230C2 (de) * 1982-05-15 1985-04-25 Hager Electro GmbH + Co, 6601 Ensheim Schutzschalter gegen Überstrom und Kurzschluß
FR2582857B1 (fr) * 1985-05-29 1989-04-28 Merlin Gerin Disjoncteur unipolaire et neutre a effet shunt

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004019532A1 (de) * 2004-04-22 2005-11-10 Medvetskiy, Oleksandr Leitungsschutzschalter

Also Published As

Publication number Publication date
DE59108266D1 (de) 1996-11-14
EP0504463A1 (fr) 1992-09-23
ATE144075T1 (de) 1996-10-15

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