EP0453518A1 - Transformateur de courant pour installation triphasee a trois conducteurs, en particulier pour la detection de la valeur effective de l'intensite pour un recepteur a courant continu regle, alimente par un redresseur. - Google Patents

Transformateur de courant pour installation triphasee a trois conducteurs, en particulier pour la detection de la valeur effective de l'intensite pour un recepteur a courant continu regle, alimente par un redresseur.

Info

Publication number
EP0453518A1
EP0453518A1 EP90903165A EP90903165A EP0453518A1 EP 0453518 A1 EP0453518 A1 EP 0453518A1 EP 90903165 A EP90903165 A EP 90903165A EP 90903165 A EP90903165 A EP 90903165A EP 0453518 A1 EP0453518 A1 EP 0453518A1
Authority
EP
European Patent Office
Prior art keywords
current
phase
current transformer
transformer
same
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.)
Granted
Application number
EP90903165A
Other languages
German (de)
English (en)
Other versions
EP0453518B1 (fr
Inventor
Wilhelm Reischer
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 Oesterreich
Original Assignee
Siemens AG Oesterreich
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 Oesterreich, Siemens AG filed Critical Siemens AG Oesterreich
Publication of EP0453518A1 publication Critical patent/EP0453518A1/fr
Application granted granted Critical
Publication of EP0453518B1 publication Critical patent/EP0453518B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/38—Instruments transformers for polyphase ac
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H01F2038/305—Constructions with toroidal magnetic core
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S323/00—Electricity: power supply or regulation systems
    • Y10S323/91—Two of three phases regulated

Definitions

  • the invention relates to a current transformer arrangement for three-wire three-phase systems, in particular for current actual value detection for regulated, converter-fed direct current consumers.
  • the mains-controlled converter with controllable semiconductors is an important control element in drive control.
  • a three-phase network is almost exclusively available.
  • the converter fulfills two tasks, namely the conversion of three-phase current into direct current in rectifier operation or the conversion of direct current into three-phase current in inverter operation, and the amplification of the power level of the controller to that of the machine.
  • the variable to be controlled is the direct current delivered by the converter to the machine.
  • shunts with potential separation shunt converter
  • magnetic amplifiers kramer converter
  • Hall probes with and without modulator amplifiers or field probes can be used in larger systems with necessary potential separation.
  • the measurement is generally carried out using an equivalent three-phase current, etc. by means of three-phase transformers.
  • the three-phase converter provides potential isolation.
  • the three-phase current is detected via three conventional converters which are designed for 0.1 A, 1 A or 5 A secondary nominal current.
  • the secondary current is rectified and passed through a load resistor, from which a proportional DC voltage is tapped can be.
  • a disadvantage here is the great expense of transformer iron and winding copper for the three current transformers, which are therefore heavy, voluminous and expensive. This effort is also great in the case of the generally known two-current converter V circuit. This has the disadvantage that the transducers mutually influence one another during demagnetization, since their demagnetization conditions fluctuate. This can lead to oscillations in the regulation.
  • a single current transformer is provided in the form of a push-through current transformer, that it is arranged on the three-phase side and that only two of the three phase conductors are threaded or inserted through the current transformer, in order to avoid this of the occurrence of a resulting flooding of zero, the two phase conductors with the same defined through-direction and a number of turns ratio of 1: 2 or with the same defined through-direction and the same number of turns, but with a current amount halved in a phase conductor or with the same
  • the number of turns, but with the opposite direction of insertion defined by the current transformer, is threaded or inserted so that the double amount of the measuring voltage occurring on the secondary side, due to the double value of the resulting flooding, is reduced to half its value by a correction circuit, and that Commands for switching the correction circuit on and off are derived from control pulses for the valves of the converter.
  • Fig. 1 shows the block diagram of a conventional single-quadrant drive with current control loop and speed control loop Fig. 2, 3 and 4 in principle similar arrangements for the
  • FIGS. 6 and 7 the temporal occurrence of the star voltages, control pulses, thyristor currents and the relevant secondary variables and FIGS. 8 and 9 two Embodiments of the electronic correction circuit.
  • the power section includes a thyristor converter 1 in a three-phase bridge circuit, commutation chokes 2, a direct current motor 3, an armature current sensor in the form of current transformers 4 arranged in the three-phase circuit and a speed sensor 5 in the form of a tachometer machine coupled to the direct current motor 3.
  • the control and regulating part includes a six-pulse control set 6, a current regulator 7, a speed regulator 8 and a setpoint generator 9 in the form of a potentiometer, in a known function.
  • the control set 6 is followed by an ignition pulse output stage 49 with distributor logic, which is used to generate the control pulses required for two successive current-carrying thyristors.
  • this stage 49 there is also pulse coupling to the thyristor that was previously in the conductive state.
  • Controlling a drive requires the command variable (setpoint) and the control variable (actual value) at the input of the controller.
  • the reference variable (setpoint) is specified as DC voltage.
  • the controlled variable (actual value), which is recorded with a sensor must be converted by means of a rectifier 10 to a DC voltage suitable for the controller input.
  • the choice of the encoder is based on the requirements placed on the drive. With the usual mains voltages of 380/500 V or higher, it is advisable to electrically isolate the control and regulating circuit from the power circuit.
  • the transducers used in drives are therefore generally of potential-isolating design. In the case of fully controlled bridge circuits, the current can in principle be detected on the direct current or alternating current side.
  • Connection of AC measuring devices is generally used, is also suitable as a transmitter.
  • FIG. 2, 3 and 4 show in principle similar arrangements for the current transformer part of a circuit according to the invention.
  • a so-called through current transformer is used here.
  • Through-current transformers which are commercially available and are used a lot for higher currents, have a through-opening 12 completely enclosed by the iron core 11.
  • it is not the primary winding, which is also connected to the terminals, that is used, but rather a primary current conductor, which is led one or more times through the through opening 12 of the current transformer 4 and which, for example, 100 times the nominal value of the primary current 6 times or 600
  • a nominal value of the primary current is carried out once to achieve the required nominal flooding of, for example, 600 AW.
  • the secondary winding 13 is usually designed for 5 A (1 A, 0.1 A) nominal current.
  • Push-through opening 12 of the current transformer 4 are carried out in the types according to the invention described below.
  • what is essential, namely to prevent the occurrence of a resulting zero flow and thus a gap in the secondary current, is achieved in that the two conductors R, S pass through with the opposite direction of insertion the push-through opening 12 of the current transformer 4 are guided.
  • the third conductor T is guided outside the iron core 11 of the current transformer 4.
  • a conductor e.g. S simple and a conductor e.g. R pushed through twice to form a feedback loop. Both conductors have the same defined insertion direction.
  • the third conductor T is also guided outside the iron core 11 of the current transformer 4.
  • the required AW ratio of 2: 1 according to the invention is achieved in that two conductors are simply pushed through, but in the case of one conductor half the current is conducted through a shunt 15 outside the iron core 11 of the current transformer 4. Of course, this is necessary that the shunt 15 and the shunted conductor piece have the same impedance. In addition, another conversion constant is to be used in the case of a calibration.
  • the resulting flooding caused by current flow in the two inserted conductors generates an impressed current in the secondary winding 13 which flows through the connected load resistor 14.
  • the course of the resulting floodings (AW) and the secondary currents proportional to them which are due to the inventive
  • the arrangement of the conductors and the conductor currents flowing in them is shown in the following figures.
  • FIG. 5 shows the known circuit diagram of a three-phase bridge circuit 16, which consists of the two three-pulse star circuits 17, 18. It has six thyristors 21-26, which are connected symmetrically to the phases R, S, T. The voltage star of the six voltages which follow one another at 60 ° is recorded below this. The thyristors must be fired in this order.
  • the numbers 21 - 26 on the voltage star, which correspond to the reference numbers for the thyristors, indicate this sequence.
  • the single-acting current blocks are in the supply line S and thus alternately in the thyristors 23 and 26 flow, characterized by horizontal hatching and the double-acting current blocks, which flow in the feed line R and thus alternately in the thyristors 21 and 24, by vertical hatching.
  • the current blocks through thyristors 22 and 25 are without influence. Geometric addition of the current blocks occurring at the same time results in the line drawing shown below for the directional size of the resulting passages.
  • FIG. 6 shows the secondary current or AW ratios for the arrangement according to FIG. 4.
  • the line is simple to construct on the basis of the information given above, it being noted that the current blocks which occur when the current flows through the conductor R and the thyristors 21 and 24, which are inserted twice, are hatched vertically.
  • the load resistor 14 which is connected to the secondary winding 13 of the current transformer 4 via a rectifier 10.
  • the load resistor 14 is connected in parallel with a resistor 27 of the same size via a transistor 28 during the period of twice the AW number.
  • the transistor 28 is controlled into a conductive state by a flip-flop 29, which is set for the thyristor 22 or 25 by means of the non-coupled control pulse (low) is reset by means of the subsequent, non-coupled control pulse for the thyristor 23 or 26.
  • control lines for the thyristors 22 and 25 are also connected to the inputs of an AND stage 30, the output of which is connected to the set input of the flip-flop 29.
  • control lines for the thyristors 23 and 26 are also connected to the inputs of an AND stage 31, the output of which is connected to the reset input of the flip-flop 29.
  • the rectification of the measuring current is carried out in a known manner by means of the rectifier 10.
  • a different sequence of those used to set and reset the flip-flop 29 must be used Control pulses are used. Of course, this also applies to an arrangement of the conductors according to FIG.
  • the advantage of this circuit lies in the fact that the iron core 11 of the current transformer 4 is not doubled so high in the doubly detected current, since in this case the resulting load resistance 14
  • the additional magnetization effort is only in Internal copper resistance of the secondary winding 13. As a result, no higher type power of the current transformer 4 is required.
  • FIG. 9 A correction circuit with somewhat more complex electronics is shown in FIG. 9.
  • an operational amplifier 32 makes it possible to load the current transformer 4 only with a very small burden voltage.
  • An impedance converter 33 is connected downstream of the operational amplifier 32 in order to be able to use a type of low current carrying capacity for the operational amplifier 32.
  • the load voltage drops across the load resistor 34 and is rectified in a known circuit via a full-wave measuring rectifier or absolute value generator.
  • Its first operational amplifier 35 which operates as an inverting rectifier, is connected to resistors 36 and 37, which have the same ohmic values as well as diodes 38 and 39.
  • Its second operational amplifier 40 which works as an inverting amplifier, is connected in the manner shown to the resistors 41-45 which have the same ohmic values.
  • An electronic switch 46 can be used to switch its gain between its full and half value. This switch 46 is again controlled by the output signal of the flip-flop 29 shown in FIG. 8.
  • the Zener diodes 47, 48 are used to discharge the burden current and thus to protect the operational amplifier 32 from overvoltage in the event that 4 overvoltages occur in the secondary winding 13 of the current transformer, which are caused by highly dynamic processes in the primary circuit, for example by switching processes or short circuits conclusions are caused.
  • the advantage of this circuit is that the current converter 4 practically works against the zero load voltage and therefore only a very small magnetizing current occurs.
  • This circuit is therefore particularly suitable for Current actual value detection with subsequent zero current signal via threshold switch is suitable. This is because the magnetizing current disturbing the zero current signal, which is known to be caused by the so-called. "Tail" of the demagnetization voltage delays the zero current signal, can be kept at a minimum value.
  • the electronic correction circuit is not necessary in the case of a pure zero-current signal, in the case of current or power measurements with pointer or digital instruments, or in the case of controls with a long smoothing time constant, since in the first case only the zeroing of the current is of interest and in the other cases the error caused by the measuring current occurring with double value can be calibrated or compensated for in the display.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Rectifiers (AREA)
  • Ac-Ac Conversion (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

Dans un transformateur de courant pour installation triphasée à trois conducteurs, on utilise, conformément à l'invention, un seul transformateur de traversée (4) monté côté courant triphasé. Grâce à ce dispositif, deux des trois conducteurs de phase sont traversés, soit avec le même nombre d'enroulements et des sens de traversée mutuellement opposés, soit avec le même sens de traversée et avec un nombre d'enroulements différent, dans un rapport de 2 pour 1, ou encore dans le même sens de traversée et avec un flux de courant divisé en deux parties dans un conducteur de phase, au moyen d'un shunt (15). Ces dispositifs permettent d'éviter l'apparition d'un flux résultant de valeur nulle. La tension secondaire de valeur double provoquée par une valeur double d'ampères-tours apparaissant deux fois à chaque période est divisée en deux par un montage de correction électronique. Ses ordres de commande sont dérivés d'impulsions de commande appropriées pour les thyristors (21-26) du montage en pont à courant continu (16). Deux montages en pont sont décrits. Le principal avantage réside dans l'économie importante réalisée pour le matériau du transformateur et, par voie de conséquence, sur l'encombrement.
EP90903165A 1989-03-09 1990-02-16 Transformateur de courant pour installation triphasee a trois conducteurs, en particulier pour la detection de la valeur effective de l'intensite pour un recepteur a courant continu regle, alimente par un redresseur Expired - Lifetime EP0453518B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT539/89 1989-03-09
AT539/89A AT393421B (de) 1989-03-09 1989-03-09 Stromwandleranordnung fuer dreileiter- drehstromsysteme zur stromistwerterfassung

Publications (2)

Publication Number Publication Date
EP0453518A1 true EP0453518A1 (fr) 1991-10-30
EP0453518B1 EP0453518B1 (fr) 1993-06-23

Family

ID=3493293

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90903165A Expired - Lifetime EP0453518B1 (fr) 1989-03-09 1990-02-16 Transformateur de courant pour installation triphasee a trois conducteurs, en particulier pour la detection de la valeur effective de l'intensite pour un recepteur a courant continu regle, alimente par un redresseur

Country Status (4)

Country Link
US (1) US5202621A (fr)
EP (1) EP0453518B1 (fr)
AT (2) AT393421B (fr)
WO (1) WO1990010940A1 (fr)

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DE4106274A1 (de) * 1991-02-28 1992-09-03 Vacuumschmelze Gmbh Stromsensor nach dem kompensationsprinzip
US5309349A (en) * 1992-09-22 1994-05-03 Industrial Technology Research Institute Current detection method for DC to three-phase converters using a single DC sensor
US5710534A (en) * 1995-04-25 1998-01-20 Abb Power T&D Company Inc. Electrical apparatus including electric field control means
WO2008065196A2 (fr) * 2006-11-30 2008-06-05 North Sensor A/S Ensemble de détection et procédé pour mesurer les éclairs
US8619443B2 (en) 2010-09-29 2013-12-31 The Powerwise Group, Inc. System and method to boost voltage
US8085009B2 (en) 2007-08-13 2011-12-27 The Powerwise Group, Inc. IGBT/FET-based energy savings device for reducing a predetermined amount of voltage using pulse width modulation
US20110182094A1 (en) * 2007-08-13 2011-07-28 The Powerwise Group, Inc. System and method to manage power usage
US8085010B2 (en) 2007-08-24 2011-12-27 The Powerwise Group, Inc. TRIAC/SCR-based energy savings device for reducing a predetermined amount of voltage using pulse width modulation
US8120307B2 (en) 2007-08-24 2012-02-21 The Powerwise Group, Inc. System and method for providing constant loading in AC power applications
US8810190B2 (en) * 2007-09-14 2014-08-19 The Powerwise Group, Inc. Motor controller system and method for maximizing energy savings
US8698447B2 (en) 2007-09-14 2014-04-15 The Powerwise Group, Inc. Energy saving system and method for devices with rotating or reciprocating masses
US20090190378A1 (en) * 2008-01-29 2009-07-30 Hideo Ishii Power supply device outputting pulsed electrical current
DE102008020371B4 (de) * 2008-04-23 2019-11-14 Kriwan Industrie-Elektronik Gmbh Verfahren sowie Sensor-Messschaltung zum Überstromschutz eines Drehstromverbrauchers
EP2148210A1 (fr) * 2008-07-21 2010-01-27 PowerSense A/S Ensemble de capteur de courant optique de Faraday en 3 phases
US8004255B2 (en) * 2008-08-07 2011-08-23 The Powerwise Group, Inc. Power supply for IGBT/FET drivers
US8698446B2 (en) * 2009-09-08 2014-04-15 The Powerwise Group, Inc. Method to save energy for devices with rotating or reciprocating masses
EP2475888B1 (fr) * 2009-09-08 2019-04-24 The Powerwise Group, Inc. Système et procédé d'économie d'énergie pour dispositifs à masses rotatives ou animées d'un mouvement alternatif
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Also Published As

Publication number Publication date
ATA53989A (de) 1991-03-15
EP0453518B1 (fr) 1993-06-23
ATE91039T1 (de) 1993-07-15
AT393421B (de) 1991-10-25
US5202621A (en) 1993-04-13
WO1990010940A1 (fr) 1990-09-20

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