EP1817826A1 - Procede et circuit pour amplifier les signaux d'entree d'un discontacteur electronique de disjoncteurs basse tension a degre d'amplification selectionnable - Google Patents

Procede et circuit pour amplifier les signaux d'entree d'un discontacteur electronique de disjoncteurs basse tension a degre d'amplification selectionnable

Info

Publication number
EP1817826A1
EP1817826A1 EP05810924A EP05810924A EP1817826A1 EP 1817826 A1 EP1817826 A1 EP 1817826A1 EP 05810924 A EP05810924 A EP 05810924A EP 05810924 A EP05810924 A EP 05810924A EP 1817826 A1 EP1817826 A1 EP 1817826A1
Authority
EP
European Patent Office
Prior art keywords
overcurrent release
microprocessor
amplifying
input signals
low
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Withdrawn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
EP05810924A
Other languages
German (de)
English (en)
Inventor
Andreas Krauss
Andreas Pancke
Wolfgang Röhl
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 EP1817826A1 publication Critical patent/EP1817826A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • 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
    • H02H3/006—Calibration or setting of parameters

Definitions

  • the invention relates to a method and a circuit ⁇ arrangement for amplifying the input signals of an electronic overcurrent release of low-voltage circuit breakers with selectable gain, the electro ⁇ nische overcurrent release on the input side has at least one integrating capacitor and at least one preamplifier and a microprocessor.
  • Electronic overcurrent releases are used to monitor the current in a single- or multi-phase network with regard to the occurrence of overcurrents and short-circuit currents.
  • the overcurrent release Depending on the level of an impermissibly high current measured via the current transformer, the overcurrent release causes a delayed or instantaneous tripping of the low-voltage circuit breaker.
  • the input signals for the electronic release are taken from the current transformers.
  • Rogowski coils for example, which have an undamped transmission behavior, but whose output signals have only a low power, so that they must be amplified before the transfer to a trigger circuit, which is usually realized by a microprocessor with upstream A / D converter ,
  • the measured current signal after A / D conversion is set in relation to a reference voltage, so that at the output of elek ⁇ tronic overcurrent release, for example, to the nominal Power of a protected system is normalized value available.
  • the amplification of the input signals of the electronic trigger takes place via an operational amplifier.
  • the gain setting in this preamplifier has hitherto been carried out by means of analog switch connected feedback resistors, such as DE 198 25 384 Al or DE 199 59 787 Al show.
  • the invention has for its object to provide a way with which the setting of the gain of a preamplifier in electronic overcurrent releases is fast, easy and inexpensive.
  • a resistor is connected with a switch in series and the switch is pulse-width modulated via the microprocessor.
  • the effective resistance value of the inserted resistors can be inversely proportional to the touch resistance. Ratio can be increased and thus an extremely wide rule ⁇ area can be achieved.
  • Another advantage of this circuit is the reduced EMC sensitivity compared to the previous switching device of the feedback resistors of the operational amplifiers.
  • only one resistor is required for different gain factors. In the event that resistance tolerances of the resistors interfere in the individual phases, a common resistor four distri ⁇ can strengthen paths existing phases are used for all three respectively.
  • Figure 1 shows a circuit according to the invention with three amplifiers ⁇ kern, in each case an amplifier for a current phase and
  • FIG. 2 shows a variant of the circuit according to FIG. 1 with a common resistance for all current phases.
  • FIG. 1 shows a circuit according to the invention for an overcurrent release of a three-phase circuit breaker.
  • current sensors are used in the form of Rogowski coils L1 ... L3.
  • the signal from each Rogowski coil Ll ... L3 is guided in each case via a resistor Rl ... R3 and a parallel-arranged ⁇ integrating capacitor Cl ... C3 to a preamplifier Vl ... V3.
  • the outputs of the preamplifiers Vl ... V3 are connected to a microprocessor ⁇ P.
  • the microprocessor ⁇ P evaluates the current signal in the three phases in cycles and, in the event of overcurrent, decides that the circuit breaker should be switched off by a signal sent to a tripping solenoid.
  • Vl ... V3 resistors R4 ... R6 are provided, which are arranged in parallel with the integrating capacitors Cl ... C3 together with Schal ⁇ tern Sl ... S3.
  • the switches Sl ... S3 are pulse-width modulated by the microprocessor ⁇ P.
  • the resistance value of the resistors R4 ... R6 may be returned to ⁇ proportional to the duty cycle and thus the height change of the input signal for the preamplifier Vl ... V3.
  • FIG. 2 shows a variant of the circuit.
  • the micro ⁇ processor uP anyway only one of the pre-amplifier Vl ... V3 is always effective and therefore currently still only one of the switches S ... must be keyed S3, currency ⁇ rend the other two in OFF position, it is possible to provide a common resistor R7 for all phases.
  • the switches Sl ... S3 are in this case connected to one side in each case to the common resistor R7 and this then to ground.

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

L'invention concerne un procédé et un circuit pour amplifier les signaux d'entrée d'un discontacteur électronique de disjoncteurs basse tension à degré d'amplification sélectionnable, ce discontacteur électronique présentant côté entrée au moins un condensateur différentiel ainsi qu'au moins un préamplificateur et un microprocesseur. Selon l'invention, une résistance est couplée avec un commutateur en série parallèlement à un condensateur différentiel et ce commutateur est déclenché par l'intermédiaire du microprocesseur avec une modulation d'impulsions en largeur. De cette manière, la valeur effectivement active des résistances introduites peut être accrue de façon inversement proportionnelle au facteur d'utilisation des impulsions, ce qui permet d'obtenir une plage de réglage extrêmement étendue.
EP05810924A 2004-11-30 2005-11-10 Procede et circuit pour amplifier les signaux d'entree d'un discontacteur electronique de disjoncteurs basse tension a degre d'amplification selectionnable Withdrawn EP1817826A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004058763A DE102004058763A1 (de) 2004-11-30 2004-11-30 Verfahren und Schaltungsanordnung zur Verstärkung der Eingangssignale eines elektronischen Überstromauslösers von Niederspannungs-Leistungsschaltern mit wählbarem Verstärkungsgrad
PCT/EP2005/055880 WO2006058823A1 (fr) 2004-11-30 2005-11-10 Procede et circuit pour amplifier les signaux d'entree d'un discontacteur electronique de disjoncteurs basse tension a degre d'amplification selectionnable

Publications (1)

Publication Number Publication Date
EP1817826A1 true EP1817826A1 (fr) 2007-08-15

Family

ID=35564708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05810924A Withdrawn EP1817826A1 (fr) 2004-11-30 2005-11-10 Procede et circuit pour amplifier les signaux d'entree d'un discontacteur electronique de disjoncteurs basse tension a degre d'amplification selectionnable

Country Status (5)

Country Link
US (1) US20080123237A1 (fr)
EP (1) EP1817826A1 (fr)
CN (1) CN101048924A (fr)
DE (1) DE102004058763A1 (fr)
WO (1) WO2006058823A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014218831B4 (de) * 2014-09-18 2020-08-20 Siemens Aktiengesellschaft Leistungsschalter
NL2021408B1 (en) * 2018-07-27 2020-01-31 Tryst B V Monitoring system of a medium-voltage electric power network, and method thereto

Family Cites Families (11)

* 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
US5606249A (en) * 1995-01-27 1997-02-25 Eaton Corporation Electrical apparatus with wide dynamic range for monitoring and protecting electric power systems
DE59702865D1 (de) * 1996-10-14 2001-02-08 Siemens Ag Verfahren und anordnung zur strommessung
DE19825384A1 (de) * 1998-05-28 1999-12-02 Siemens Ag Elektronische Auslöseeinheit für einen Leistungsschalter
DE60038486D1 (de) * 1999-04-12 2008-05-15 Chk Wireless Technologies Aust Vorrichtung und verfahren zur elektrischen messungen in leitungen
DE19959787A1 (de) * 1999-12-07 2001-06-13 Siemens Ag Mit einer Rogowskispule zusammenwirkender elektronischer Überstromauslöser für einen Leistungsschalter
DE19959789A1 (de) * 1999-12-07 2001-06-13 Siemens Ag Integrationsschaltung für die Auslöseelektronik eines mit einer Rogowskispule zusammenwirkenden Leistungsschalters
DE10148815A1 (de) * 2001-10-02 2003-04-10 Abb Patent Gmbh Verfahren und Einrichtung zur Stromwertermittlung unter Einsatz eines Stromwandlers, welcher im Bereich der Kernsättigung arbeitet
US7099130B2 (en) * 2003-01-17 2006-08-29 Ericson Manufacturing Company Voltage monitor for ground fault circuit interrupter
DE102004011023A1 (de) * 2004-03-04 2005-09-15 Siemens Ag Drei- oder vierpoliger Niederspannungs-Leistungsschalter mit als Stromsensoren dienenden Rogowskispulen
EP1896859A1 (fr) * 2005-06-29 2008-03-12 Abb Research Ltd. Appareil pour la détection d'un courant et procédé pour actionner un tel appareil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006058823A1 *

Also Published As

Publication number Publication date
CN101048924A (zh) 2007-10-03
DE102004058763A1 (de) 2006-06-08
US20080123237A1 (en) 2008-05-29
WO2006058823A1 (fr) 2006-06-08

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