EP2044447A1 - Dispositif de mesure - Google Patents

Dispositif de mesure

Info

Publication number
EP2044447A1
EP2044447A1 EP06775746A EP06775746A EP2044447A1 EP 2044447 A1 EP2044447 A1 EP 2044447A1 EP 06775746 A EP06775746 A EP 06775746A EP 06775746 A EP06775746 A EP 06775746A EP 2044447 A1 EP2044447 A1 EP 2044447A1
Authority
EP
European Patent Office
Prior art keywords
sensor
magnetic field
measuring device
conductor
coupled
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Withdrawn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
EP06775746A
Other languages
German (de)
English (en)
Inventor
Peter Kaluza
Richard Schmidt
Christian Widmann
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 EP2044447A1 publication Critical patent/EP2044447A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/26—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using modulation of waves other than light, e.g. radio or acoustic waves

Definitions

  • the invention relates to a measuring device, in particular for the potential-free measurement of direct and / or alternating currents - especially a measuring device for detecting direct currents with high insulation resistance -, according to the preamble of claim 1.
  • a measuring device for the potential-free measurement of direct and / or alternating currents - especially a measuring device for detecting direct currents with high insulation resistance -, according to the preamble of claim 1.
  • Such measuring devices are generally known.
  • the problem with the measurement at a shunt resistor is the galvanic connection of the measuring points with the potential of the current-carrying conductor. This requires evaluation electronics which have both a potential-separated power supply and a potential-separated signal path for transmitting the measured values.
  • the current detection with magnetic field sensors has the advantage of freedom from feedback, ie no series resistor must be inserted into the current path, so that the disadvantages associated with the separation of the line, with the shunt resistor resulting power loss and the change in the line impedance disadvantages ,
  • the use of magnetic field sensors also benefits from the advantages that result from a potential separation caused by the principle, for example when using transformers.
  • a measuring device in particular a measuring device for current measurement, with a sensor and an evaluation device which is coupled or can be coupled thereto, it is provided that the coupling between the sensor and the evaluation device takes place without contact.
  • the advantage of the invention is that this coupling provides the possibility of non-contact energy and / or data, e.g. Measured values in the form of electronic signals to transmit.
  • the senor preferably has a first transponder interface and the evaluation device has a second transponder interface.
  • the coupling then takes place according to the transponder principle;
  • the coupling is a transponder coupling on a particular inductive basis or electromagnetic base (radio). If the first transponder interface assigned to the sensor is a passive transponder interface, this first transponder interface and / or the sensor as a whole does not have its own energy supply, so that repercussions on the electrical variables to be measured are largely avoided.
  • the energy required for the measurement receives the first transponder interface via the second transponder interface of the evaluation device.
  • the senor comprises a differential amplifier, which is coupled in an advantageous embodiment via a shunt resistor to a line or can be coupled.
  • the measuring device according to the invention is also used in a measurement via a shunt
  • Resistance can be used, which is otherwise due to unavoidable repercussions on the electrical variables to be measured in connection with non-reactive or low-retroaction measurement rather not considered.
  • a magnetic field sensor is available, which is coupled to the conductor or can be coupled.
  • a magnetic field sensor in particular in an embodiment as a GMR sensor, there is the possibility of measuring a current flowing through the conductor without repercussions or at most negligible repercussions on the conductor and the measured electrical ⁇ sizes.
  • the senor and evaluation device are each designed as a separate structural unit. Then, on the one hand, the sensor with the magnetic field sensor can be assigned to the conductor and, on the other hand, the evaluation device can be associated with the sensor by appropriate positioning.
  • the advantage of the invention and of individual embodiments is that the relatively large discrepancies Dance of the coupling according to the transponder principle also an encapsulated and touch-safe design of the sensor on the one hand and the evaluation allowed on the other. Furthermore, the transponder coupling allows within certain limits mechanical movements between the sensor and the line. In particular embodiments, it is also possible to realize rotational movements (rotation) or spatial variability.
  • the shunt resistor In the case of a sensor with a shunt resistor, the sensor together with this shunt resistor can form a structural unit in which no cable connections between the evaluation unit and the live area of the conductor detected during the measurement are required.
  • the senor with its transponder interface forms a hazard-free measuring point, which can be read out with mobile devices.
  • An electronics associated with the sensor may additionally have a particularly non-volatile identification information, as it is known from other transponder applications. In this way, from a group of measuring points, a single measuring point from a higher-level system, e.g. the respective evaluation, are clearly identified. This is particularly useful when replacing components or when moving the components or measuring points.
  • a current detection via a magnetic field sensor in particular a GMR sensor, comes as an advantage that the current sensor optimally close to the current-carrying or current carrying conductor, a line, a conductor or a busbar or the like, can be arranged.
  • the magnetic field sensor behaves completely opposite to the alternative embodiment with the shunt resistor without reaction. The unavoidable in shunt resistor additional line resistance and the resulting power dissipation does not occur in the magnetic field sensor.
  • such a magnetic field sensor can easily be arranged in the region of the respective conductor and retrofitted on a busbar as a conductor, possibly even without its disassembly.
  • magnetic field sensors in their embodiment as GMR sensors which are based on a field-direction-dependent operating principle (gradient field sensor) have advantages for use as current sensors because they are extremely stable against large magnetic fields and also the mode of operation of the magnetic field direction Dependence can be exploited by a specific arrangement of a plurality of individual sensors to a bridge circuit to achieve a high insensitivity to external interference fields.
  • FIG. 2 shows a device for contactless current measurement by means of a magnetic field sensor
  • FIG. 3 shows a first embodiment of a device according to the invention
  • Measuring device with a contactless coupling between a part of the measuring device acting as a sensor and a part of the same measuring device acting as an evaluation device 4 shows an alternative embodiment to the embodiment shown in FIG 3 by means of GMR or magnetic field sensor and
  • FIG 5 shows a schematically simplified representation of the embodiment according to FIG 4, wherein the sensor and the evaluation are each designed as a separate unit.
  • FIG. 1 shows a measuring device 10 known from the prior art for measuring the conductor 12 flowing through it
  • the known measuring device is based on a shunt resistor 14 present in the conductor 12, above which the voltage drop is measured, and via a differential amplifier 16 to an analog-to-digital converter 18 from which the data which encodes the measured current are stored in sequential form, e.g. be forwarded via an optical waveguide 20, to a digital-to-analog converter 22 and from there to a voltage-current converter 24.
  • the device 10 comprises an oscillator 26, a voltage regulator 28, a sine wave generator 30 and a rectifier / filter 32 fed therefrom which is provided for the voltage supply. Overall, the measuring device 10 is divided into a first part 34 and a second part 36, wherein the first part 34 assumes the function of a sensor and the conductor 12 is spatially associated and wherein the second part 36 the
  • Function as an evaluation takes over and can be arranged away from acting as a sensor first part 34.
  • FIG. 2 schematically shows, in simplified form, the use of a magnetic field sensor 38 for current measurement, to which a differential amplifier 16, a servo circuit or the like is arranged downstream.
  • the magnetic field sensor 38 which is designed in particular in a form as a measuring bridge with a plurality of individual magnetic field sensors (gradient field sensor), detects the magnetic field H around the conductor 12. According to the known per se, it is possible to determine the strength of the magnet - close the field I to the current I, so that the actual intended current measurement is possible.
  • FIG. 3 and FIG. 4 show the embodiment of the measuring device according to the invention, in which a first part of the measuring device designated as a sensor 40 is contactlessly coupled to a second part of the measuring device 10 functioning as an evaluation device 42.
  • This contactless coupling is achieved in that the part acting as sensor 40 has a first transponder interface 44 and the part functioning as evaluation device 42 has a second transponder interface 46.
  • the first transponder interface 44 assigned to the sensor 40 is designed as a passive transponder interface, so that the sensor 40 receives its energy via the evaluation device 42 and its transponder components 46.
  • the sensor 40 includes for
  • the embodiment is shown, in which the current measurement is performed by detecting the current I caused by the magnetic field H.
  • the sensor 40 (see FIG. 2) has a magnetic field sensor 38, possibly in one embodiment as a measuring bridge with a plurality of individual magnetic field sensors, and a differential amplifier 16, which if necessary - analogous to the comments above on FIG Representation in FIG 1 may include.
  • sensor 40 and evaluation device 42 are embodied as a separate structural unit and in which sensor 40 as magnetic field sensor 38 is a GMR sensor. Includes sensor and a conductor 12 is assigned in the form of a busbar, a conductor or the like. Between the magnetic field sensor 38 and the conductor 12, an insulating layer 50 is provided, which functions as a functional insulation between the conductor 12 and the magnetic field sensor 38.
  • Sensor 40 and evaluation device 42 are each constructed on a separate circuit board 52, 54, wherein in the representation of FIG 5, the representation of the circuit board 52, 54 also includes the representation of the respective transponder antenna. Between the printed circuit boards 52, 54 and thus at least piecewise formed transponder antenna thus results in the transponder interface, marked in Figure 5 by the vertical double arrow.
  • the sensor 40 and a sensor and transponder circuit 56 is applied, for example in the form of an ASIC.
  • a GMR layer functioning as a magnetic field sensor 38 may be applied directly to this circuit 56.
  • the evaluation device-side transponder circuit that is to say the second transponder interface 46, is realized in particular in the form of an ASIC 58.
  • a measuring device 10 in particular for current measurement, is indicated with a sensor 40 and an evaluation device 42 coupled or coupleable thereto, in which the coupling takes place without contact, in particular via a transponder interface 44, 46 , so that on the one hand a feedback-free current measurement is possible, on the other hand, the resulting measuring device 10 due to the mobility of the components to each other and due to the comparatively large possible distance between the two parts of the transponder interface 44, 46 is particularly flexible and versatile.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

La présente invention concerne un dispositif de mesure (10), en particulier pour la mesure de courant, qui comporte un capteur (40) et un dispositif d'évaluation (42) couplé ou pouvant être couplé à celui-ci, le couplage s'effectuant sans contact, en particulier par une interface de transpondeur (44, 46), de sorte que d'une part une mesure de courant exempte d'effets rétroactifs est possible, et d'autre part le dispositif de mesure (10) résultant peut être utilisé de manière particulièrement flexible et polyvalente en raison de la mobilité des composants les uns par rapport aux autres et en raison de la distance possible comparativement importante entre les deux parties de l'interface de transpondeur (44, 46).
EP06775746A 2006-07-26 2006-07-26 Dispositif de mesure Withdrawn EP2044447A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2006/001291 WO2008011843A1 (fr) 2006-07-26 2006-07-26 Dispositif de mesure

Publications (1)

Publication Number Publication Date
EP2044447A1 true EP2044447A1 (fr) 2009-04-08

Family

ID=37896079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06775746A Withdrawn EP2044447A1 (fr) 2006-07-26 2006-07-26 Dispositif de mesure

Country Status (5)

Country Link
US (1) US20100007335A1 (fr)
EP (1) EP2044447A1 (fr)
CN (1) CN101484813A (fr)
DE (1) DE112006004042A5 (fr)
WO (1) WO2008011843A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1399487B1 (it) * 2010-04-09 2013-04-19 Bertolini Dispositivo e metodo di misura sicura di almeno una grandezza elettrica di una linea elettrica ad alta tensione
DE102010041936A1 (de) * 2010-10-04 2012-04-05 Robert Bosch Gmbh Verfahren und Detektionssystem zur Detektion einer elektrischen Leitung
EP2691782A1 (fr) * 2011-03-29 2014-02-05 Continental Teves AG & Co. oHG Capteur de courant
FR2998059B1 (fr) * 2012-11-15 2014-12-19 Schneider Electric Ind Sas Capteur de courant mixte et procede de montage dudit capteur
DE102014219238A1 (de) * 2014-09-24 2016-03-24 Continental Automotive Gmbh Überstromerkennung im Stromsensor mit Hallsensor
GB201518372D0 (en) * 2015-10-16 2015-12-02 Johnson Electric Sa Current determining device and methods
TWI644112B (zh) 2016-12-14 2018-12-11 旺玖科技股份有限公司 用以感測電氣設備使用狀態之感測器及其感測方法
EP3246358A1 (fr) 2016-05-18 2017-11-22 Borealis AG Copolymères de propylène souple et transparent
US10139435B2 (en) * 2016-11-11 2018-11-27 Fluke Corporation Non-contact voltage measurement system using reference signal
CN108205085A (zh) * 2016-12-19 2018-06-26 旺玖科技股份有限公司 用以感测电气设备使用状态的传感器及其感测方法
CN110596527B (zh) * 2019-08-05 2022-02-18 深圳华物信联科技有限公司 非接触式交流线监测装置及方法

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US3197702A (en) * 1960-02-19 1965-07-27 S & C Electric Co Power line voltage measurement modulated transmission system
US5270637A (en) * 1992-07-22 1993-12-14 Basic Measuring Instruments Impulse direction detector for ac power systems
DE19514342C1 (de) * 1995-04-18 1996-02-22 Siemens Ag Stromwandler, geeignet zur Stromstärkemessung an/in auf Hochspannung liegenden elektrischen Einrichtungen
US5963038A (en) * 1996-06-06 1999-10-05 U.S. Philips Corporation Method of testing a connection which includes a conductor in an integrated circuit
CA2406444C (fr) * 2000-04-13 2010-11-09 Genscape, Inc. Appareil et procede de mesure et de surveillance de la generation et de la transmission de courant electrique
WO2005033717A1 (fr) * 2003-10-01 2005-04-14 Eaton Corporation Topologie de detection de courant a concentrateur de flux magnetique

Non-Patent Citations (1)

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Title
See references of WO2008011843A1 *

Also Published As

Publication number Publication date
US20100007335A1 (en) 2010-01-14
WO2008011843A1 (fr) 2008-01-31
DE112006004042A5 (de) 2009-06-25
CN101484813A (zh) 2009-07-15

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