EP0074297A1 - Hybrider kompensierter Stromwandler - Google Patents

Hybrider kompensierter Stromwandler Download PDF

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Publication number
EP0074297A1
EP0074297A1 EP82401529A EP82401529A EP0074297A1 EP 0074297 A1 EP0074297 A1 EP 0074297A1 EP 82401529 A EP82401529 A EP 82401529A EP 82401529 A EP82401529 A EP 82401529A EP 0074297 A1 EP0074297 A1 EP 0074297A1
Authority
EP
European Patent Office
Prior art keywords
current
frequency
sensor according
current sensor
terminals
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
EP82401529A
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English (en)
French (fr)
Other versions
EP0074297B1 (de
EP0074297B2 (de
Inventor
Pierre Schueller
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin SA
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
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Application filed by Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0074297A1 publication Critical patent/EP0074297A1/de
Publication of EP0074297B1 publication Critical patent/EP0074297B1/de
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Publication of EP0074297B2 publication Critical patent/EP0074297B2/de
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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
    • H01F38/22—Instruments transformers for single phase AC
    • H01F38/28—Current transformers
    • H01F38/32—Circuit arrangements
    • 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

Definitions

  • the invention relates to a current sensor for electronic measuring and / or prdtection apparatus intended to control the current in a line of an electrical energy supply system, and comprising a secondary winding wound on a CH core, so as to deliver a combined secondary measurement and supply signal whose value is a function of the intensity of the primary current Il flowing in the line.
  • the senor is formed by a conventional current transformer whose secondary winding is capable of delivering a certain electrical power.
  • a current transformer associated with electronic equipment generally requires a high number of turns which results, especially if the space is limited, which can disturb the operation of the associated electronic equipment when it is in the near the current transformer.
  • the high manufacturing cost and the large size of such a conventional transformer constitute additional disadvantages.
  • the object of the invention is to remedy these drawbacks and to produce an improved inductive current sensor capable of delivering a predetermined secondary power, with reduced heating and without any auxiliary power source for the operation of the electronic equipment.
  • the sensor according to the invention is characterized in that a load resistor R 2 is connected to the output terminals of the secondary winding having an ohmic resistance R 1 , and that the core CM is provided with at least one air gap non-magnetic of predetermined length e, the inductive sensor being of the hybrid type whose secondary time constant t 2 defined by the relation is between 10 microseconds and 100 milliseconds, R being the reluctance of the CH core and n the number of turns of the secondary winding.
  • the range of values of the time constant t 2 is determined by the total length of the non-magnetic gap (s) of the core advantageously between 0.5 and 20 millimeters, and by the value of the load resistance R 2 of the order of 10 to 1000 Ohms.
  • the secondary winding of the hybrid sensor cooperates with a frequency compensation circuit connected to the terminals of the load resistor R 2 , and delivering a measurement image signal whose amplitude is substantially constant when the frequency f of the primary current It is included in a predetermined range around a central frequency f o of compensation.
  • Said frequency compensation circuit includes a phase shift system for phasing the measurement image signal with the primary current II to be checked when the frequency of the latter corresponds to the central frequency f o .
  • the image signal for measuring the compensation circuit is injected into an electronic processing system delivering a tripping order to a control coil of a circuit breaker when the image signal exceeds a predetermined threshold, l 'supply to the treatment system by means of the uncompensated voltage U 2 taken from the terminals of the load resistor R 2 .
  • the hybrid current sensor 10 comprises a magnetic circuit CM in the form of a torus provided with one or more air gaps 12 of total length e.
  • the magnetic circuit CM is crossed by a line 14 of a network supply of alternating current, line 14 playing the role of primary winding traversed by a current I 1 to be checked.
  • a secondary winding 16 is wound on the toroid and comprises n turns of ohmic resistance R 1 .
  • a load resistor R 2 is connected to the output terminals of the secondary winding.
  • the secondary time constant t 2 of the hybrid sensor is defined by the relation , R being the total reluctance of the magnetic circuit CM.
  • the secondary winding 16 delivers an output current I 2 representing a vector quantity whose module and phase shift ⁇ with respect to the primary current I 1 are illustrated by the diagrams of FIG. 2 as a function of the secondary time constant t 2 and for a given frequency f of the primary current I 1 .
  • the module expressed by the report varies between 0 and 1 when the time constant t 2 increases.
  • the sensor is a conventional current transformer.
  • time constants t 2 of less than 10 microseconds the sensor is of the non-magnetic type.
  • the hybrid sensor occupies the intermediate zone.
  • the section of the secondary winding of an inductive sensor being proportional to the product nI 2 , it can be seen in FIG. 2 that it is the current transformer where nI2 is close to I 1 , which requires the largest winding volume and which is therefore the most expensive.
  • the torus has an air gap 12 in FIG. 1 has been replaced by a rectangular magnetic circuit CM with two air gaps 12a, 12b, comprising two elementary U-shaped parts located opposite one another, so as to confine a window crossed by the line 14.
  • a secondary winding 16 single is wound on the magnetic circuit CH.
  • the secondary winding is formed by two coils 16a, 16b connected in series or in parallel, the rest being identical to the sensor of FIG. 3.
  • the relative position of the coils 16a, 16b with respect to the air gaps can be arbitrary.
  • the characteristics of the hybrid sensor 10 according to FIGS. 1 to 3 nevertheless depend on the frequency variation of the current I 1 to be measured.
  • the amplitude and the phase of the output voltage U 2 at the terminals of the secondary winding 16 indeed vary with the frequency. This is why a frequency compensation circuit 18 (FIG. 5) is associated with the hybrid sensor.
  • the frequency compensation circuit 18 (fig. 5) is formed by a series circuit RC connected in parallel to the terminals of the load resistor R 2 .
  • the image signal of the current I 1 to be measured is the voltage U c across the capacitor C.
  • the values of R and C of circuit 18 are defined by the following relation: where f o is the central compensation frequency (55 Hz for example).
  • the compensation circuit 18 is constituted by a series circuit with inductance L and resistance R, connected in parallel to the terminals of R 2 , the image signal for measuring the current I 1 in this case being the voltage U R aux resistance R.
  • FIG. 7 compares the amplitudes of the output voltages U 2 and U C before and after the compensation as a function of the frequency f of the current I 1 to be measured, the values of the time constant t 2 and of the current intensity Il being given. It is noted that the amplitude of the image voltage U c is substantially constant when the frequency f of the current Il is within a predetermined range around the central frequency f o of compensation. The current I 1 to be measured and the voltage U C are in phase when the frequency of the current I 1 is equal to the central frequency f o .
  • FIG. 8 represents the application of a compensated hybrid sensor described with reference to FIG. 5, and delivering a combined secondary measurement and supply signal to an electronic control device or static trip device of a circuit breaker with its own current, one of the contacts 20 of which is inserted in line 14.
  • the measurement image signal U c of the compensation circuit 18 is injected into an electronic processing system 22 via a first connecting conductor 24.
  • the uncompensated voltage U 2 of the secondary winding 16 will be advantageously used for supplying the treatment 22 thanks to a second connecting conductor 26.
  • the output of the processing system 22 delivers a tripping order to a control coil 28 which conventionally causes the mechanism to be unlocked. 30 and the opening of the contacts 20 of the protective circuit breaker.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Transformers For Measuring Instruments (AREA)
EP19820401529 1981-08-26 1982-08-13 Hybrider kompensierter Stromwandler Expired EP0074297B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8116416A FR2512264A1 (fr) 1981-08-26 1981-08-26 Capteur de courant hybride compense
FR8118416 1981-08-26

Publications (3)

Publication Number Publication Date
EP0074297A1 true EP0074297A1 (de) 1983-03-16
EP0074297B1 EP0074297B1 (de) 1985-11-21
EP0074297B2 EP0074297B2 (de) 1988-12-07

Family

ID=9261728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820401529 Expired EP0074297B2 (de) 1981-08-26 1982-08-13 Hybrider kompensierter Stromwandler

Country Status (5)

Country Link
EP (1) EP0074297B2 (de)
JP (1) JPS5895266A (de)
CA (1) CA1203284A (de)
DE (1) DE3267597D1 (de)
FR (1) FR2512264A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2603992A1 (fr) * 1986-09-16 1988-03-18 Alsthom Dispositif pour l'acquisition numerique d'un courant electrique alternatif issu d'un transformateur de courant a tore magnetique saturable
GB2201249A (en) * 1987-02-13 1988-08-24 Budapesti Mueszaki Egyetem Measuring transformer
EP0315207A3 (en) * 1987-11-06 1989-09-13 Nissan Motor Co., Ltd. A system and method for automatically controlling a vehicle speed to a desired cruise speed with a release function

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5495169A (en) * 1984-10-12 1996-02-27 Smith; Dayle Clamp-on current sensor
FR2752996B1 (fr) * 1996-09-05 1998-10-02 Schneider Electric Sa Transformateur de courant et relais de protection comportant un tel transformateur

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR514999A (fr) * 1916-01-10 1921-03-22 Siemens Schuckertwerke Gmbh Transformateur d'intensité dont la charge comporte un condensateur dans le but de compenser le courant déwatté
DE535000C (de) * 1928-08-11 1931-10-05 Elek Zitaets Act Ges Vorm W La Resonanzkreis
FR833139A (fr) * 1937-03-02 1938-10-12 Siemens Ag Transformateur d'intensité à noyau annulaire pour la mesure des courants à haute fréquence
FR1142618A (fr) * 1956-02-09 1957-09-20 Telemecanique Electrique Procédé et dispositif de mesure des intensités élevées
CH350710A (de) * 1956-11-09 1960-12-15 Bbc Brown Boveri & Cie Stromwandleranlage für Höchstspannungsanlagen
DE1281545B (de) * 1963-05-29 1968-10-31 Siemens Ag Eisenkernwandler mit Luftspalt zur Strommessung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR514999A (fr) * 1916-01-10 1921-03-22 Siemens Schuckertwerke Gmbh Transformateur d'intensité dont la charge comporte un condensateur dans le but de compenser le courant déwatté
DE535000C (de) * 1928-08-11 1931-10-05 Elek Zitaets Act Ges Vorm W La Resonanzkreis
FR833139A (fr) * 1937-03-02 1938-10-12 Siemens Ag Transformateur d'intensité à noyau annulaire pour la mesure des courants à haute fréquence
FR1142618A (fr) * 1956-02-09 1957-09-20 Telemecanique Electrique Procédé et dispositif de mesure des intensités élevées
CH350710A (de) * 1956-11-09 1960-12-15 Bbc Brown Boveri & Cie Stromwandleranlage für Höchstspannungsanlagen
DE1281545B (de) * 1963-05-29 1968-10-31 Siemens Ag Eisenkernwandler mit Luftspalt zur Strommessung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2603992A1 (fr) * 1986-09-16 1988-03-18 Alsthom Dispositif pour l'acquisition numerique d'un courant electrique alternatif issu d'un transformateur de courant a tore magnetique saturable
EP0266231A1 (de) * 1986-09-16 1988-05-04 Gec Alsthom Sa Anordnung zur numerischen Erfassung eines von einem Stromtransformator mit sättigbarem Magnetkern stammenden Wechselstromes
GB2201249A (en) * 1987-02-13 1988-08-24 Budapesti Mueszaki Egyetem Measuring transformer
EP0315207A3 (en) * 1987-11-06 1989-09-13 Nissan Motor Co., Ltd. A system and method for automatically controlling a vehicle speed to a desired cruise speed with a release function
US5127487A (en) * 1987-11-06 1992-07-07 Nissan Motor Company, Limited System and method for automatically controlling a vehicle speed to a desired cruise speed with a release function

Also Published As

Publication number Publication date
FR2512264B1 (de) 1983-10-28
FR2512264A1 (fr) 1983-03-04
CA1203284A (en) 1986-04-15
JPS5895266A (ja) 1983-06-06
EP0074297B1 (de) 1985-11-21
EP0074297B2 (de) 1988-12-07
JPH0447271B2 (de) 1992-08-03
DE3267597D1 (en) 1986-01-02

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