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WO1998005975A1 - Procede et dispositif de detection optique d'une variable electrique - Google Patents

Procede et dispositif de detection optique d'une variable electrique Download PDF

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Publication number
WO1998005975A1
WO1998005975A1 PCT/DE1997/001480 DE9701480W WO9805975A1 WO 1998005975 A1 WO1998005975 A1 WO 1998005975A1 DE 9701480 W DE9701480 W DE 9701480W WO 9805975 A1 WO9805975 A1 WO 9805975A1
Authority
WO
WIPO (PCT)
Prior art keywords
measurement signals
optical
optical measurement
sensor
electrical
Prior art date
Application number
PCT/DE1997/001480
Other languages
German (de)
English (en)
Other versions
WO1998005975A8 (fr
Inventor
Ottmar Beierl
Thomas Bosselmann
Michael Willsch
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to CA002261901A priority Critical patent/CA2261901A1/fr
Priority to EP97934422A priority patent/EP0916095A1/fr
Publication of WO1998005975A1 publication Critical patent/WO1998005975A1/fr
Publication of WO1998005975A8 publication Critical patent/WO1998005975A8/fr

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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
    • G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
    • G01R15/247—Details of the circuitry or construction of devices covered by G01R15/241 - G01R15/246

Definitions

  • the invention relates to a method and an arrangement for optically detecting an electrical variable, in particular a current or a voltage.
  • optical measuring arrangements which are based, for example, on the agneto-optical Faraday effect.
  • Linearly polarized measuring light is transmitted through a Faraday element arranged in the vicinity of a current conductor.
  • the magnetic field generated by the current causes the plane of polarization of the measuring light to rotate by an angle of rotation which is proportional to the path integral over the magnetic field along the path covered by the measuring light.
  • the angle of rotation can reach a value of over 90 °, 180 °, 360 °, and even a multiple thereof, so that with a simple determination of the angle of rotation during evaluation, no clear statement about the absolute value of the angle of rotation is possible . For this reason, only changes in the angle of rotation in a clear range, e.g. up to 90 °, approved and evaluated accordingly accordingly.
  • Passing through a Faraday optical fiber surrounding a current conductor is divided by a beam splitter into two partial light signals and each of these light signals is fed to an analyzer.
  • the natural axes of the two analyzers are at an angle of 0 ° or 45 ° to the coupling polar sation of the measuring light aligned. This results in a first, sinusoidal signal at the output of one analyzer and a second, cosine-shaped signal at the output of the other analyzer.
  • German patent application 195 44 778 proposes a method which uses two partial measurements. To measure the electrical measured variable in a predetermined measuring range, a first measuring signal, which is a clear function of the measured variable above the measuring range, and a second measuring signal, which is a periodic and ambiguous function of the measured variable in the predetermined measuring range, are generated. A third measurement signal, which is unambiguous over the measurement range and which has at least the measurement resolution of the second measurement signal, is derived from the two measurement signals. In this way, an absolute value can be determined at least for the unambiguous range of the first measurement signal.
  • the invention has for its object to provide a method and an arrangement for measuring an electrical quantity with optical means, wherein an evaluation of the optical measurement signals beyond 90 ° is possible in a simple manner.
  • the object is achieved according to the invention with a method for optically detecting an electrical variable
  • At least a first and a second optical measurement signal are generated as a function of the electrical variable
  • the two measurement signals serve in the sense of a pair of values to which an absolute value for the electrical quantity is assigned.
  • the new method allows the measurement range to be expanded beyond the uniqueness range (1st quadrant).
  • the electrical quantity is determined at any time without storing the previous history or the previous measured values, since there is no incremental method. It is advantageous if the periodicities of the characteristic curves of the two measurement signals are close to one another.
  • the dependencies of the optical measurement signals should be so different that as the electrical quantity to be measured increases, the phase shift between the measurement signals changes. ben is. If necessary, the measurement signals can also have a linear or non-linear dependency, for example.
  • the two optical measurement signals are generated with measurement light of different frequencies. In this way, only one optical sensor or only one measuring system is required. The dependence of the Faraday effect on the wavelength of light is used. Two sensitivities are thus achieved.
  • the two optical measurement signals can be generated simultaneously or in succession, in particular multiplex. With a simultaneous measurement, the measurement signals can be generated simultaneously and separately. In the case of a multiplex design, fewer components are required.
  • the two optical measurement signals can advantageously be generated in succession by continuous change, in particular by wobble, of the periodicity of the one measurement signal. This results in a continuous transition between the two measurement signals, which in principle allows an infinite number of measurement signals, as a result of which the measurement accuracy and the uniqueness of the measurement become particularly high.
  • the optical measurement signals can be different
  • Light sensors are generated. This enables separate measurement signal generation.
  • the measurement signals can also by means of a common light sensor are generated, which comprises two light paths. This procedure is very simple, and the outlay on components is low.
  • a further measurement signal can be generated whose dependence on the electrical quantity is periodic and which is used to determine the electrical quantity more precisely. In this way there is a further increase in the uniqueness and the accuracy of the measurement signal.
  • a current or a voltage is advantageously suitable as an electrical variable.
  • the problem of the arrangement can be solved with an arrangement for detecting an electrical variable on a conductor with:
  • At least one first optical sensor which generates at least two optical measurement signals, the dependence of the measurement signals on the electrical quantity being periodic, and wherein one period is larger and at most twice as large as the other, and
  • the sensor can have at least two optical measurement paths with different optical properties for generating the optical measurement signals.
  • the two measurement signals can thus be generated easily, with little effort being required for the sensor. It is easy if the two measuring paths are formed by different materials. A small size is targetable. Alternatively, the two measurement paths can have different lengths. Here the material is kept low.
  • the optical sensor can be designed in several parts in accordance with its number of measurement paths. This enables a simple modular structure.
  • the optical property of the sensor can also be switchable or changeable to generate the optical measurement signals.
  • the sensor thus becomes an active element of the arrangement, and any number of optical measurement signals can be generated with only one sensor and its control
  • the sensor can advantageously generate a further measurement signal which, in addition to the pair of values, is used to generate the value for the electrical variable.
  • the measuring accuracy and uniqueness are thus further improved.
  • a light source can be assigned to the sensor, the frequency of which can be changed periodically and continuously, in particular in the sense of Wobbein, in order to generate the two light signals. In principle, a continuous spectrum of measurement signals can thus be generated.
  • FIG. 1 shows an arrangement for the optical detection of an electrical signal and FIG. 2 shows a characteristic curve diagram for two measurement signals.
  • the new method is generally explained using a schematic diagram of an arrangement according to FIG. 1.
  • aim The new method is to enable a unambiguous measurement based on ambiguous measurement signals with polarized sensors.
  • a sensor 3 is arranged on the conductor 1 and operates on an optical basis.
  • the mode of operation can be based, for example, on the Faraday effect or on the Pockels effect. It is important to detect the current I or the voltage U. In the present case, current detection is assumed as an example.
  • the sensor 3 is connected via a light guide 5 to a light source 7, which supplies the sensor 3 with a polarized light.
  • the polarization of the polarized light is changed in the sensor 3 as a function of the electrical quantity I, in particular rotated in its plane of polarization, and then fed to an evaluation device 11 via a second light guide 9. It is of course also possible to use arrangements in which the sensor, polarizer and analyzer form a structural unit.
  • the generated rotation of the polarization plane in the measurement signal is determined in the evaluation device 11.
  • the rotation is a measure of the electrical quantity to be detected.
  • the first sensor 3 delivers a periodic output signal. This means that the measurement signal is no longer unambiguous for electrical variables that cause a phase shift beyond 90 °. Proceed as follows to clearly record the electrical quantity:
  • light source 7 can emit measuring light of different frequencies. This can be done simultaneously, so that the two optical measurement signals can also be detected simultaneously.
  • a multiplex procedure (relating to the light transmitter or evaluation device) is also conceivable.
  • a change in the light frequency after a wobble process can also be favorable.
  • the senor 3 itself is designed to form the two optical measuring signals.
  • it can comprise, for example, two light paths, both of which have different optical properties, to which a common measuring light is supplied.
  • a fiber spool would be conceivable, which has a tap, so that there are two outputs. In this way, light paths of different lengths were formed.
  • two completely separate light paths are also possible, which are formed by the same materials of different dimensions or by different materials.
  • the sensitivity of the sensor can be set with the number of turns of the fiber spool.
  • FIG. 1 shows a further variant in a broken line representation of a control device 13, which enables the first sensor 3 to be controlled or switched over via an action line 15.
  • This version would offer itself for a multiplex measurement value acquisition, in which the optical properties of the sensor 3 are continuously switched over or continuously reversed, so that different measurement signals are generated alternately.
  • the evaluation device 11 must be synchronized with the control device 13 for this purpose.
  • switchability or continuous reversal of the light source 7 is also possible.
  • the measurement signal here can be understood to be the optical measurement signals or electrical measurement signals already derived therefrom, which are usually used for electronic, in particular digital measurement value processing.
  • the characteristic curves Ml and M2 represent amplitude curves corresponding to the change in the angle of rotation as a function of the electrical variable to be measured. It can be seen that both characteristic curves Ml and M2 are periodic between a minimum and a maximum value Min or Max, and have a slightly different period.
  • the characteristic curves shown represent the characteristic diagrams for the acquisition of the two optical measured values.
  • a unique value can be determined using two
  • the value of the electrical quantity can be e.g. determine according to the following relationship:
  • PI and P2 mean the values of the measured signals determined in the sense of a pair of values and K a predeterminable factor.
  • a further possibility for determining the absolute value of the electrical quantity would be possible by comparing the determined measured values with stored value pairs.
  • the measured values can be used as a table address to find the corresponding value of the electrical quantity.
  • a comparison of the polarities of the respective amplitude values and the difference in the amplitudes could be used to determine the electrical magnitude.
  • the absolute value of the electrical quantity can also be determined in a direct manner, namely by calculation from the two existing measured values using general mathematical methods with appropriate algorithms.
  • a clear measurement generation or acquisition using a controllable sensor may also be conceivable, which modulates the measurement light by suitable methods and can thus generate further measurement information, e.g. the temperature, if necessary.
  • a preferred application of the measuring method and the arrangement is given in the optical current and voltage measurement, in particular for high or medium voltage. As a result, measurement size detection for a large measurement range can be achieved with only one sensor.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

Selon ce procédé de détection optique d'une variable électrique (I), une dépendance périodique est établie entre le signal de mesure optique et la variable électrique à mesurer (I). Afin d'obtenir un signal de mesure univoque, il est prévu d'utiliser deux signaux de mesure optiques présentant une dépendance périodique. Les valeurs mesurées servent de paire de valeurs pour affecter de façon univoque une valeur absolue de la variable électrique (I).
PCT/DE1997/001480 1996-08-01 1997-07-14 Procede et dispositif de detection optique d'une variable electrique WO1998005975A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002261901A CA2261901A1 (fr) 1996-08-01 1997-07-14 Procede et dispositif de detection optique d'une variable electrique
EP97934422A EP0916095A1 (fr) 1996-08-01 1997-07-14 Procede et dispositif de detection optique d'une variable electrique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19631138 1996-08-01
DE19631138.1 1996-08-01

Publications (2)

Publication Number Publication Date
WO1998005975A1 true WO1998005975A1 (fr) 1998-02-12
WO1998005975A8 WO1998005975A8 (fr) 1999-05-27

Family

ID=7801529

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/001480 WO1998005975A1 (fr) 1996-08-01 1997-07-14 Procede et dispositif de detection optique d'une variable electrique

Country Status (4)

Country Link
EP (1) EP0916095A1 (fr)
CN (1) CN1230257A (fr)
CA (1) CA2261901A1 (fr)
WO (1) WO1998005975A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000037949A1 (fr) * 1998-12-22 2000-06-29 Siemens Aktiengesellschaft Procede et dispositif de mesure optique d'un courant electrique a l'aide de signaux lumineux ayant differentes longueurs d'onde
EP1179735A1 (fr) * 2000-08-12 2002-02-13 Abb Research Ltd. Procédé de mesure d'une tension électrique et capteur de tension
WO2011154408A1 (fr) 2010-06-07 2011-12-15 Abb Research Ltd Capteur de haute tension doté d'électrodes se chevauchant axialement
WO2015124677A1 (fr) 2014-02-21 2015-08-27 Abb Technology Ag Capteur interférométrique
US10725073B2 (en) 2014-02-21 2020-07-28 Abb Power Grids Switzerland Ag Interferometric sensor
DE102022210973A1 (de) * 2022-10-18 2024-04-18 Siemens Energy Global GmbH & Co. KG Messen eines elektrischen Stroms

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111474553B (zh) * 2020-06-22 2020-11-27 深圳市汇顶科技股份有限公司 飞时测距方法与装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3141325A1 (de) * 1981-10-17 1983-04-28 BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau Verfahren zur strommessung an einem elektrischen leiter durch den faraday-effekt
WO1996006359A1 (fr) * 1994-08-23 1996-02-29 Siemens Aktiengesellschaft Procede et systeme permettant de mesurer des courants electriques dans au moins deux plages de mesure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3141325A1 (de) * 1981-10-17 1983-04-28 BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau Verfahren zur strommessung an einem elektrischen leiter durch den faraday-effekt
WO1996006359A1 (fr) * 1994-08-23 1996-02-29 Siemens Aktiengesellschaft Procede et systeme permettant de mesurer des courants electriques dans au moins deux plages de mesure

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000037949A1 (fr) * 1998-12-22 2000-06-29 Siemens Aktiengesellschaft Procede et dispositif de mesure optique d'un courant electrique a l'aide de signaux lumineux ayant differentes longueurs d'onde
US6515467B1 (en) 1998-12-22 2003-02-04 Siemens Aktiengesellschaft Method and system for optically detecting an electric current by means of light signals having different wavelengths
EP1179735A1 (fr) * 2000-08-12 2002-02-13 Abb Research Ltd. Procédé de mesure d'une tension électrique et capteur de tension
WO2011154408A1 (fr) 2010-06-07 2011-12-15 Abb Research Ltd Capteur de haute tension doté d'électrodes se chevauchant axialement
US9279834B2 (en) 2010-06-07 2016-03-08 Abb Research Ltd High-voltage sensor with axially overlapping electrodes and local field sensors
US9291650B2 (en) 2010-06-07 2016-03-22 Abb Research Ltd High-voltage sensor with axially overlapping electrodes
WO2015124677A1 (fr) 2014-02-21 2015-08-27 Abb Technology Ag Capteur interférométrique
US10725073B2 (en) 2014-02-21 2020-07-28 Abb Power Grids Switzerland Ag Interferometric sensor
DE102022210973A1 (de) * 2022-10-18 2024-04-18 Siemens Energy Global GmbH & Co. KG Messen eines elektrischen Stroms
WO2024083489A1 (fr) * 2022-10-18 2024-04-25 Siemens Energy Global GmbH & Co. KG Mesure d'un courant électrique à l'aide de deux transformateurs de courant optique
DE102022210973B4 (de) * 2022-10-18 2025-04-03 Hsp Hochspannungsgeräte Gmbh Messen eines elektrischen Stroms

Also Published As

Publication number Publication date
EP0916095A1 (fr) 1999-05-19
CN1230257A (zh) 1999-09-29
WO1998005975A8 (fr) 1999-05-27
CA2261901A1 (fr) 1998-02-12

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