EP0074297B2 - Capteur de courant hybride compensé - Google Patents

Capteur de courant hybride compensé Download PDF

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Publication number
EP0074297B2
EP0074297B2 EP19820401529 EP82401529A EP0074297B2 EP 0074297 B2 EP0074297 B2 EP 0074297B2 EP 19820401529 EP19820401529 EP 19820401529 EP 82401529 A EP82401529 A EP 82401529A EP 0074297 B2 EP0074297 B2 EP 0074297B2
Authority
EP
European Patent Office
Prior art keywords
current
circuit
resistance
frequency
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.)
Expired
Application number
EP19820401529
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German (de)
English (en)
French (fr)
Other versions
EP0074297B1 (fr
EP0074297A1 (fr
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/fr
Publication of EP0074297B1 publication Critical patent/EP0074297B1/fr
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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 according to the preamble of claim 1.
  • a current sensor according to the preamble of claim 1.
  • Such a device of the prior art is described in document DE-B-1281545, in which the secondary winding delivers an output voltage proportional to dl 1 / dt, that is to say the variation of the primary current 1 1 during the time t.
  • the secondary time constant of such a non-magnetic or magnetic circuit sensor with an air gap is less than 10 microseconds.
  • the output voltage is applied to an integrator circuit RC of the series resistance and capacitor type, intended to deliver a signal more or less proportional to the primary current l 1 .
  • Such a sensor does not cause heating but is not suitable for producing a power signal.
  • Conventional sensors also use current transformers with non-gap magnetic cores, the secondary winding of which delivers a measurement signal proportional to the primary current, the proportionality factor corresponding to the transformation ratio of the transformer.
  • the secondary time constant is greater than 100 milliseconds.
  • This type of transformer is capable of delivering a measurement and power signal, but the section of the magnetic circuit must be large enough to avoid saturation of the magnetic circuit during the passage of large currents in the line. This results in a large size and a high manufacturing cost.
  • 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 inductive sensor according to the invention is characterized by the characteristics of the characterizing part of claim 1.
  • 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 an alternating current supply network, the line 14 playing the role of primary winding traversed by a current l 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 n 2 / Re (R, + R 2 ). Re being the total reluctance of the magnetic circuit CM.
  • the secondary winding 16 delivers an output current 12 representing a vector quantity whose module and phase shift ⁇ with respect to the primary current are illustrated by the diagrams of FIG. 2 as a function of the secondary time constant t 2 and for a frequency f given of the primary current l 1 .
  • the modulus expressed by the ratio nl 2 / l 1 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 n1 2 , it can be seen in FIG. 2 that it is the current transformer where n1 2 is close to l 1 , which requires the most winding volume important and which is therefore the most expensive.
  • the torus has an air gap 12 in FIG. 1 has been replaced by a CM magnetic circuit
  • a single secondary winding 16 is wound on the magnetic circuit CM.
  • 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 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 l 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 l 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 l 1 to be measured, the values of the time constant t 2 and of the intensity of the current l 1 being given. It will be noted that the amplitude of the image voltage U c is substantially constant when the frequency f of the current l 1 is within a predetermined range around the central frequency f o of compensation. The current l 1 to be measured and the voltage U c are in phase when the frequency of the current l 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 Capteur de courant hybride compensé Expired EP0074297B2 (fr)

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 EP0074297A1 (fr) 1983-03-16
EP0074297B1 EP0074297B1 (fr) 1985-11-21
EP0074297B2 true EP0074297B2 (fr) 1988-12-07

Family

ID=9261728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820401529 Expired EP0074297B2 (fr) 1981-08-26 1982-08-13 Capteur de courant hybride compensé

Country Status (5)

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

Families Citing this family (6)

* 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
FR2603992B1 (fr) * 1986-09-16 1988-10-28 Alsthom Dispositif pour l'acquisition numerique d'un courant electrique alternatif issu d'un transformateur de courant a tore magnetique saturable
DE3701779A1 (de) * 1987-02-13 1988-08-04 Budapesti Mueszaki Egyetem Als stromwandler anwendbarer, linear uebertragender messgeber
JPH01122735A (ja) * 1987-11-06 1989-05-16 Nissan Motor Co Ltd 定速走行装置
JPH0174564U (enrdf_load_stackoverflow) * 1987-11-07 1989-05-19
FR2752996B1 (fr) * 1996-09-05 1998-10-02 Schneider Electric Sa Transformateur de courant et relais de protection comportant un tel transformateur

Family Cites Families (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

Also Published As

Publication number Publication date
EP0074297B1 (fr) 1985-11-21
FR2512264B1 (enrdf_load_stackoverflow) 1983-10-28
JPH0447271B2 (enrdf_load_stackoverflow) 1992-08-03
EP0074297A1 (fr) 1983-03-16
DE3267597D1 (en) 1986-01-02
FR2512264A1 (fr) 1983-03-04
CA1203284A (en) 1986-04-15
JPS5895266A (ja) 1983-06-06

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