EP1388191A1 - Circuit de pontage pour le declencheur a surintensite d'un disjoncteur de puissance a basse tension - Google Patents

Circuit de pontage pour le declencheur a surintensite d'un disjoncteur de puissance a basse tension

Info

Publication number
EP1388191A1
EP1388191A1 EP02726078A EP02726078A EP1388191A1 EP 1388191 A1 EP1388191 A1 EP 1388191A1 EP 02726078 A EP02726078 A EP 02726078A EP 02726078 A EP02726078 A EP 02726078A EP 1388191 A1 EP1388191 A1 EP 1388191A1
Authority
EP
European Patent Office
Prior art keywords
circuit
bypass circuit
release
magnet
current
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Withdrawn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
EP02726078A
Other languages
German (de)
English (en)
Inventor
Henry Franke
Manfred Schiller
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
Publication of EP1388191A1 publication Critical patent/EP1388191A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

Definitions

  • the invention relates to a bypass circuit for the electronic overcurrent release of a current-limiting low-voltage circuit breaker with separate current sensors for the electronic overcurrent release and for the bypass circuit and with a release magnet for releasing an energy store of the circuit breaker.
  • a major reason for using bypass circuits is the required evaluation time of the current signal by an electronic overcurrent release, especially if it has previously been in an inactive idle state.
  • An inactive idle state can exist after the circuit breaker has been switched off or during an operation in which the current flows through the circuit breaker so low that sufficient auxiliary energy is not generated to operate the overcurrent release.
  • the energy for operating the electronic devices of the circuit breaker and the overcurrent release is to be taken from the network itself, which, apart from the short-term state (approx. 10 ms) after switching on or a current increase in the network via the aforementioned threshold value by the current sensor itself or if necessary, an additional energy converter is also easily possible. But even with sufficient
  • a microprocessor-based overcurrent release cannot supply auxiliary power immediately in the event of a short circuit, because the RESET routine of the microprocessor and the closing processing of the current measured values requires more than 10 ms. This time requirement is too high for current-limiting circuit breakers. For this reason, analog or analog-electronic bypass circuits are used, which enable the circuit breaker to react much more quickly.
  • ironless current sensors of the Rogowski type are used for the bypass circuit.
  • the tripping magnet is common to both types of tripping and is actuated via a common control circuit.
  • Z-diodes are used as threshold elements in this solution as well as in EP 0 279 689.
  • a prerequisite for the desired rapid response of the circuit breaker to a short-circuit current is, in addition to the immediate delivery of a signal after a threshold value of the monitored current has been exceeded, that there is sufficient energy available to actuate the tripping magnet. This can be ensured that the electronic devices of the circuit breaker are powered by a constantly active auxiliary energy source (battery or the like). Often, however, an "autonomous" supply is preferred not only to the trip electronics, but also to the trip magnet from the network in which the circuit breaker is located. As a rule, the current transformers are then used for the energy supply, which also supply the measured values of the current, or separate "energy transformers" are installed in the circuit breaker.
  • the invention is based on the object of specifying a bypass circuit for the trigger of a low-voltage circuit breaker which ensures a high level of safety against tripping in the event of short circuits.
  • the current sensors provided for operating the bypass circuit are designed as current transformers with an output power sufficient to actuate a release magnet when a short-circuit current flows.
  • the solution creates a completely independent circuit for instantaneous triggering of the switch contacts. This means that the release energy is provided, the response threshold is dimensioned and the contacts are converted into a mechanical movement by means that are neither partially nor wholly part of the normal release system. If a separate release magnet is provided, the most favorable design of the components and is obtained the shortest trigger delay. However, the release magnet available for the electronic overcurrent release can also be used in a version with a second winding for release by the bypass circuit.
  • the effort for the second tripping system is surprisingly low, since it is only a matter of detecting very high currents with an uncritical tolerance and therefore the current transformer in particular can have a very simple structure.
  • the magnetic circuit can be open, e.g. B. as a rod-shaped core.
  • the evaluation circuit can have a correspondingly simple structure. It consists, for example, of a rectifier, a capacitor and a threshold circuit controlling the state of charge of the capacitor.
  • the bypass circuit can be short-circuited during normal operation of the overcurrent release. As a result, it is put out of operation and therefore cannot cause faulty tripping if electromagnetic interference occurs.
  • the drawing shows a phase of a three-phase overcurrent release system of a low-voltage circuit breaker with a set of current sensors 1 combined from Rogowski coils and energy andern, a digital electronic overcurrent release 2, consisting of a microprocessor including reset generator, a power supply, the measurement signal processing and the trip circuit, which sends a signal to one in the event of a detected overcurrent in a monitored network Trigger magnet Fl of the low-voltage circuit breaker.
  • the bypass circuit 4 is fed from a separate current sensor 3, which is designed as an energy-supplying current transformer and is constructed as simply as possible. Its cores can e.g. B. be magnetically open (rod cores).
  • the bypass circuit 4 comprises a bridge rectifier and a capacitor C to be charged by the latter.
  • a threshold circuit 5 monitors the state of charge of the capacitor C. As soon as a sufficient charging voltage has been reached at the capacitor C, an electronic switch V2 is closed and thereby the energy stored in the capacitor C. a second trigger magnet F2 supplied.
  • An advantage of using the separate trigger magnets F1 and F2 is the possibility of optimally adapting them electrically and magnetically to the energy available for triggering, and thus, in particular with regard to the second trigger magnet F2, a particularly low trigger delay with a more favorable dimensioning of the current sensor 3 and the components of the bypass
  • a common trigger magnet F3 is indicated in dash-dotted lines in the figure and has separate windings for the two trigger paths. This means that there are separate circuits for both types of tripping, but which use a common mechanical-magnetic path
  • the bypass circuit 4 thus works completely independently of the microprocessor-based electronic overcurrent release
  • bypass circuit 4 can be short-circuited by the transistor VI. This means that it is ineffective and cannot interfere with overcurrent release 2.

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Breakers (AREA)

Abstract

L'invention concerne un circuit de pontage (4) servant à déclencher, le plus instantanément possible, un disjoncteur de puissance indépendamment d'un déclencheur à surintensité électronique existant (2), en cas de court-circuit. A cet effet, ce circuit de pontage (4) est alimenté par son propre capteur de courant (3), conçu sous forme de transformateur de courant, pour charger un condensateur (C) jusqu'à ce qu'un circuit de seuil (5) se déclenche. La charge du condensateur (C) est ensuite acheminée vers un aimant de déclenchement séparé (F2) ou un aimant de déclenchement combiné (F3), pourvu de bobines séparées pour les deux voies de déclenchement.
EP02726078A 2001-05-14 2002-04-05 Circuit de pontage pour le declencheur a surintensite d'un disjoncteur de puissance a basse tension Withdrawn EP1388191A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10125051 2001-05-14
DE10125051A DE10125051A1 (de) 2001-05-14 2001-05-14 Umgehungsschaltung für den Überstromauslöser eines Niederspannungsschalters
PCT/DE2002/001347 WO2002093709A1 (fr) 2001-05-14 2002-04-05 Circuit de pontage pour le declencheur a surintensite d'un disjoncteur de puissance a basse tension

Publications (1)

Publication Number Publication Date
EP1388191A1 true EP1388191A1 (fr) 2004-02-11

Family

ID=7685798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02726078A Withdrawn EP1388191A1 (fr) 2001-05-14 2002-04-05 Circuit de pontage pour le declencheur a surintensite d'un disjoncteur de puissance a basse tension

Country Status (5)

Country Link
US (1) US20040145844A1 (fr)
EP (1) EP1388191A1 (fr)
JP (1) JP2004531999A (fr)
DE (1) DE10125051A1 (fr)
WO (1) WO2002093709A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10342598A1 (de) * 2003-09-11 2005-04-14 Siemens Ag Verfahren und Schaltungsanordnung zur Schnellausschaltung von Niederspannungs-Leistungsschaltern
DE10355879A1 (de) * 2003-11-25 2005-07-07 Siemens Ag Sicherung für das Abschalten einer im sicheren Betrieb betriebenen sicherungstechnischen Einrichtung
US7385594B2 (en) * 2004-02-19 2008-06-10 Au Optronics Corporation Position encoded sensing device and a method thereof
ITMI20052522A1 (it) * 2005-12-29 2007-06-30 Abb Service Srl Unita' di protezione di una linea elettrica a bassa tensione ac-dc
DE102008012605B4 (de) * 2008-03-05 2013-01-31 Siemens Aktiengesellschaft Schutzschaltgerät zum Überwachen des elektrischen Stromflusses zu einem elektrischen Verbrauch
US8720626B2 (en) * 2012-08-28 2014-05-13 Caterpillar Global Mining Llc Motor drive system
US8941348B2 (en) 2012-12-18 2015-01-27 Caterpillar Global Mining Llc Motor protection system
US9520710B2 (en) 2014-06-24 2016-12-13 Eaton Corporation Thermal trip assembly and circuit interrupter including the same

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024436A (en) * 1973-11-30 1977-05-17 Syracuse Electronics Corporation Subsidiary Of Pass & Seymour, Inc. Ground fault protective circuitry
US4015169A (en) * 1975-03-14 1977-03-29 Westinghouse Electric Corporation Two pole ground fault circuit interrupter with improved rectified supply and transient suppression for a trip circuit
US4104601A (en) * 1976-04-12 1978-08-01 I-T-E Imperial Corp. Direct fault tripping of circuit breaker having solid state trip means
FR2501929A1 (fr) * 1981-03-10 1982-09-17 Merlin Gerin Disjoncteur basse tension et procede de fabrication d'un capteur de courant
FR2598266B1 (fr) * 1986-04-30 1994-02-18 Merlin Et Gerin Declencheur statique instantane pour un disjoncteur limiteur
US4751606A (en) * 1987-02-20 1988-06-14 Westinghouse Electric Corp. Circuit interrupter apparatus with a battery backup and reset circuit
US5311392A (en) * 1991-08-30 1994-05-10 Siemens Energy & Automation, Inc. Dual processor electric power trip unit
WO1994008379A1 (fr) * 1992-09-30 1994-04-14 Elin Energieversorgung Gesellschaft Mbh Agencement de relais de protection numeriques
DE19735412A1 (de) * 1997-08-14 1999-02-18 Siemens Ag Fehlerstrom-Schutzeinrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02093709A1 *

Also Published As

Publication number Publication date
DE10125051A1 (de) 2002-11-21
US20040145844A1 (en) 2004-07-29
JP2004531999A (ja) 2004-10-14
WO2002093709A1 (fr) 2002-11-21

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