WO2013186420A1 - Bobine de rogowski et procédé de mesure du courant circulant dans un conducteur - Google Patents

Bobine de rogowski et procédé de mesure du courant circulant dans un conducteur Download PDF

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Publication number
WO2013186420A1
WO2013186420A1 PCT/ES2013/070385 ES2013070385W WO2013186420A1 WO 2013186420 A1 WO2013186420 A1 WO 2013186420A1 ES 2013070385 W ES2013070385 W ES 2013070385W WO 2013186420 A1 WO2013186420 A1 WO 2013186420A1
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WO
WIPO (PCT)
Prior art keywords
tube
wound
rogowski coil
conductors
conductor
Prior art date
Application number
PCT/ES2013/070385
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English (en)
Spanish (es)
Inventor
Jesús Antonio ROMERO GONZÁLEZ
Original Assignee
Centro De Investigaciones Energéticas, Medioambientales Y Tecnológicas (Ciemat)
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.)
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Application filed by Centro De Investigaciones Energéticas, Medioambientales Y Tecnológicas (Ciemat) filed Critical Centro De Investigaciones Energéticas, Medioambientales Y Tecnológicas (Ciemat)
Publication of WO2013186420A1 publication Critical patent/WO2013186420A1/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
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils

Definitions

  • the present invention relates to a Rogowski coil and is framed in the field of electronic devices, in particular devices for measuring electric current.
  • the Rogowski coil is used as a non-intrusive method to measure the current flowing through a conductor (W. Rogowski and W. Steinhaus, "D / ' e Messung der magnetischenr", Archiv für Elektrotechnik, 1912, 1, Pt. 4 , pp. 141-150).
  • the Rogowski coil comprises a helical winding around a tube of constant section. Said tube closes on itself and around the cable of which it is desired to measure the current, forming a toroidal sensor loop.
  • the Rogowski coils are sensitive to external electromagnetic fields produced by conductors not embraced by the sensor loop and electromagnetic interference in general, and the measurement delivered is dependent on the relative positioning between the Rogowski coil and the conductor.
  • the conductor In the ideal case where the coil has perfect axial symmetry with respect to an axis parallel to the conductor, the conductor is perfectly rectilinear and the electromagnetic field present is generated exclusively by the conductor whose current is to be measured, the voltage signal supplied by the sensor loop It is analogous to the temporal variation of the current to be measured. In this case, using an integrating circuit with the appropriate calibration, a signal proportional to the current flowing through the conductor can be obtained.
  • the drivers are not perfectly rectilinear and the sensor loop has no axial symmetry, so the current measurements depend on the orientation and position of the conductor that crosses the sensor loop.
  • the existence of external electromagnetic fields not produced by the conductor whose current is to be measured introduces inductive, capacitive and electromagnetic interference problems. All these factors limit the accuracy of Rogowski type coils.
  • the present invention solves the problems mentioned above by means of a Rogowski coil according to claim 1 and a method according to claim 18.
  • Preferred embodiments of the invention are defined in the dependent claims.
  • the Rogowski coil of the invention comprises a tube of substantially constant section, with a first end and a second end, being adapted the tube so that its ends can approach each other to form a toroidal loop in a use situation, and a plurality of electrical conductors, each electrical conductor comprising at least one conductive wire, the conductive wires being electrically isolated from each other, where Electric conductors verify that:
  • the coiled conductors are interwoven clockwise with the coiled conductors counterclockwise.
  • the electrical conductors may include one or more conductive wires. Throughout this document, in the case where each conductor contains a single conductor wire, reference shall be made either to the conductor or to the conductor wire.
  • the tube is adapted so that its ends can approximate each other to form a toroidal loop in the sense of being sufficiently flexible to allow said approximation of its ends and to maintain a substantially toroidal configuration.
  • the coil of the present invention provides a high rejection of external fields, allowing to eliminate and / or reduce the inductive coupling of the Rogowski coil with other external circuits not embraced by the measuring sensor loop and electromagnetic interference.
  • the coil of the invention provides a correct and high precision measurement of the current flowing through a conductor, regardless of the relative positioning and orientation between the measurement loop and the conductor whose current is to be measured.
  • the interwoven of the conductors of the coil of the invention introduces a spatial averaging that makes the measurement obtained independent of the relative positioning between the measurement loop and the conductor whose current is to be measured, thus avoiding errors derived from a possible runout of the conductor with respect to the sensor loop.
  • the interwoven also eliminates inductive coupling with external conductors not embraced by the sensor loop. Therefore, the proposed coil measures the current more accurately than the coils of the state of the technique, also relaxing the requirements of constructive precision and therefore reducing manufacturing costs.
  • each conductor has an even number of conductive wires.
  • each conductor wound in a certain direction passes an equal number of times above and below any other conductor wound in the opposite direction when completing a turn around the tube.
  • all conductive wires are electrically connected to each other.
  • the conductive wires wound clockwise are electrically connected with the conductive wires wound in an anti-clockwise direction.
  • the electrical connection at one or both ends of the conductive wire tube wound clockwise with conductive wires wound counterclockwise is a one-to-one connection.
  • the conductive wires wound clockwise are electrically connected with the conductive wires wound counterclockwise and at the second end of the tube, the conductive wires wound clockwise are electrically connected to the conductive wires wound in the anti-clockwise direction, except a conductive wire in the clockwise direction and a conductive wire in the anti-clockwise direction that remain unconnected to act as terminals, such that they configure an open path that runs through all the conducting wires from a terminal to another.
  • the connection is preferably one to one.
  • the conductive wires wound clockwise are electrically connected with the conductive wires wound counterclockwise and at the second end of the tube the conductive wires wound clockwise are electrically connected to the wires drivers wound counterclockwise, so that they configure a single closed path.
  • the connection is preferably one to one.
  • one of the conductive wires comprises a first section and a second section separated by a section, so that the adjacent ends of both sections act as measurement terminals in a use situation. More than one conductor wire can be sectioned in two sections to configure more than one pair of measurement terminals, which allows several simultaneous measurements to be carried out in a use situation.
  • both a conductive wire wound clockwise and a conductive wire wound counterclockwise comprise a first section and a second section separated by a section, so that the sectioned end of a section of each of the conductors acts as a terminal, the other two ends being electrically connected to each other.
  • the conductive wires wound clockwise are electrically connected, preferably one by one, with the conductive wires wound in an anti-clockwise direction and at the second end of the tube the conductive wires wound in a clockwise direction they are electrically connected to each other and the conductive wires wound counterclockwise are electrically connected to each other, thus configuring the two sets of ends connected to at least two terminals to transmit a measured signal in a coil use situation.
  • the conductive wires wound in each direction can be connected in a single connection, thus configuring two measuring terminals, or in two or more unions, so that instead of a pair of terminals, two or more pairs of measurement terminals are configured , which allows several simultaneous measurements in a use situation.
  • a measuring terminal can be configured from a single conductor wire or from the union of several conductor wires.
  • the conductive wires wound clockwise are electrically connected, preferably one by one, with the conductive wires wound in an anti-clockwise direction and at the second end of the tube the conductive wires wound in a clockwise direction are electrically connected each other and the conductive wires wound in an anti-clockwise direction are electrically connected to each other, thus configuring the two conductor wire junctions two terminals to transmit a measured signal in a coil use situation.
  • the coil additionally comprises at least one conductive element without electrical insulation, wound on the tube and configured to be grounded.
  • the coil comprises a plurality of conductive elements without electrical insulation, all connected together at the ends of the tube and configured to connect them to ground.
  • the electrical conductors each comprise a plurality of conductive wires.
  • the electrical conductors are strands.
  • the electrical conductors are multi-coaxial cables.
  • the electrical conductors are wound on the tube with a winding angle ⁇ of between 0 and 90 °, preferably between 45 ° and 90 ° with respect to the longitudinal direction of the tube. It will be understood that the range ends are included in the ranges.
  • the tube is configured so that its ends can approximate each other to form a toroidal loop of several turns in a use situation.
  • a method for measuring the current flowing through a conductor characterized in that it comprises the following steps: arranging a coil according to the first inventive aspect around the conductor whose current it is desired to measure,
  • Figure 1 shows a Rogowski coil in a configuration in a use situation.
  • Figure 2 shows the configuration of interwoven electrical conductors on the tube.
  • FIG 3 the geometric configuration of interwoven electrical conductors on the tube is schematically represented.
  • a first embodiment of the coil of the invention with a serial connection between conductors is shown in Figure 4.
  • FIG. 5 A second embodiment of the coil of the invention with a serial connection between conductors is shown in Figure 5.
  • FIG. 6A A third embodiment of the coil of the invention with a serial connection between conductors is shown in Figures 6A and 6B.
  • FIG. 7 A fourth embodiment of the coil of the invention with a serial connection between conductors is shown in Figure 7.
  • a fifth embodiment of the coil of the invention with a serial connection between conductors is shown in Figure 8.
  • An embodiment of the coil of the invention is shown in Figure 9 with a parallel connection between conductors.
  • FIG. 10 A second embodiment of the coil of the invention with a parallel connection between conductors is shown in Figure 10.
  • Figures 1 1A and 1 1 B respectively show a test system for experimenting with coils and an enlarged detail thereof.
  • Figure 12 shows results of the measurement of the current flowing through a conductor, measured with two coils according to the invention.
  • Figure 14 shows current measurement results in the absence of a conductor inside the sensor loop.
  • the Rogowski coil of the invention comprises a tube (1) of substantially constant section, on which a plurality of electrical conductors (2, 3) are evenly interwoven over the tube (1).
  • Each conductor (2, 3) can have one or more conductive wires (2A, 3A) electrically isolated from each other.
  • Half of the electrical conductors (2) of the interwoven are wound clockwise and the other half (3) counterclockwise.
  • the conductors wound clockwise (2) are interwoven with the conductors wound in the opposite direction (3).
  • Figure 2 shows the configuration of electrical conductors interwoven on the tube in a coil section according to the invention, where a tube (1) is shown on which a plurality of electrical conductors are interwoven, with three conductive wires (2A , 2B, 2C; 3A, 3B, 3C) in each driver.
  • Figure 1 shows a Rogowski coil according to the invention, in a situation of use, with the ends of the coil adjacent to each other and the coil forming a toroid that surrounds the conductive element (20) whose current is to be measured.
  • Figure 3 shows a portion of an interwoven according to an embodiment with several conductors (2, 3) wound in each direction and three conductive wires (2A, 2B, 2C; 3A, 3B, 3C) for each conductor (2, 3 ).
  • the winding angle ⁇ formed by the conductors with respect to the longitudinal direction of the tube is also indicated.
  • a first embodiment is shown schematically in Figure 4 in which the conductors (2, 3) are connected in series.
  • a reduced number of conductors (2, 3) and conductive wires per conductor as well as a small winding angle have been used to more clearly appreciate the coil configuration.
  • the coil has four interwoven conductors (2, 3), two clockwise (2) and two counterclockwise (3), with a conductive wire for each conductor.
  • the thick lines represent a clockwise winding direction (2) and the fine lines represent a clockwise winding direction (3).
  • the conductors wound clockwise (2) are electrically connected one by one with the conductors wound in the direction anti-time (3), with the exception of two conductors (4) located at one end of the tube (1) that remain unconnected and are intended to act as terminals.
  • Said conductors (4) that remain unconnected, one wound in a clockwise direction (2) and another wound in an anti-clockwise direction (3), are reserved for their electrical connection with a signal transmission cable.
  • the rest of the conductors are connected in such a way that they configure a single open path with beginning and end in both terminals (4).
  • Figure 5 shows schematically an embodiment of a serial connection of six interwoven conductors (2, 3), three conductors clockwise (2) and three conductors counterclockwise (3), with a conductor wire for each conductor.
  • the thick lines represent a clockwise winding direction (2) and the fine lines represent an anti-clockwise winding direction (3) and the black dots indicate the junction points between the conductors wound clockwise (2 ) and anti-schedule (3).
  • Figure 6A shows an embodiment of a serial connection of six interwoven conductors (2, 3), with two conductive wires (2A, 2B; 3A, 3B) for each conductor.
  • the conductors wound in one direction and in another are represented with different lines.
  • This configuration would be equivalent to the serial connection of two six-conductor interwoven (2, 3) with a conducting wire (2A; 3A) for each conductor, as shown in Figure 6B.
  • the conductors (4) wound clockwise (2) and anti-clockwise (3) are connected at the ends of the tube (1).
  • the connections are carried out thread by wire, so that all the wires except two are connected one by one, setting up a single Open path with start and end at the ends of the two unconnected conductive wires.
  • Said ends of the two conductor wires that remain unconnected, one wound in a clockwise direction (2A) and another wound in an anti-clockwise direction (3A) are reserved as terminals (4) for their electrical connection with a signal transmission cable in a coil use situation.
  • Figure 7 is another embodiment with three conductors (2, 3) wound in each direction and a single conductor wire each, connected the conductors wound in a clockwise direction (2) with the conductors wound in an anti-clockwise direction (3) each other one at the ends of the tube (1).
  • all the conductive wires are connected at their ends one by one, configuring a single closed path and one of the wires is sectioned in a substantially central area of the tube (1), so that the sectioned ends configure the terminals (4 ) to measure the voltage signal in a coil use situation.
  • the sectioned thread may be wound clockwise or counterclockwise.
  • Figure 8 is a variant of Figure 7, the only difference between the two being that in this embodiment there are two sectioned conductive wires, wound one in each direction. Thus, one sectioned end of each conductor wire configures each terminal (4) for extracting the measured signal, while the other two sectioned ends are connected to each other.
  • FIG 9 an embodiment of parallel connection of six interwoven conductors (2, 3) is shown schematically, three in each direction, with a conducting wire (2A, 3A) for each conductor.
  • the thick lines represent a clockwise winding direction (2) and the fine lines an anti-hourly winding direction (3) and the black dots indicate the junction points between conductors. It is appreciated that at one end of the tube (in the figure, the left end) all the conductive wires (2, 3) are in electrical contact. At the other end, all conductors wound clockwise (2) are connected forming a first terminal (4) and all conductors wound counterclockwise (3) are connected forming a second terminal (4).
  • FIG. 10 A variant embodiment in parallel is shown in Figure 10, similar to that in Figure 9, the only difference being that at the end of the tube in which it is not Find the terminals (4), the conductors are connected one by one, the windings clockwise (2) with the windings anti-clockwise (3).
  • the coil (10) additionally comprises a screening mesh, configured by at least one conductive element without electrical insulation, wound on the tube (1) and adapted to be grounded.
  • a screening mesh configured by at least one conductive element without electrical insulation, wound on the tube (1) and adapted to be grounded.
  • the screening mesh is provided by conductive wires without electrical insulation interwoven over the tube (1) and forming part of the conductors (2, 3).
  • the screening mesh is provided as an outer jacket disposed on the tube (1) with the interwoven conductors (2, 3).
  • the sensor loop is formed by approaching the two ends of the tube to form a toroidal loop around the conductor (20) whose current is to be measured, as shown in Figure 1. Said loop may have a or several turns around the conductor (20).
  • the voltage measured between the ends of the coil (10) is analogous to that derived from the current in the conductor (20), so it is possible to obtain the current flowing through the conductor (20) integrating analogically or digitally in time The measured voltage signal.
  • the experimental results obtained with an embodiment of the Rogowski coil of the invention are shown in Figures 12 to 14, which has 24 threads and 24 threads wound at 45 degrees.
  • FIG 11 shows the scheme of the test system (30) used in the experiments to check the accuracy of the Rogowski coil (10) according to the exemplified embodiments.
  • the test system (30) is of the "stellarator” type and has coils (31) that create a toroidal field, and three coils that create a poloidal field (32, 33, 34).
  • the Rogowski coil (10) of the embodiment schematically represented with a tubular appearance, is arranged inside the coils that create the toroidal field (31).
  • VF conductor English, Vertical Field, VF
  • the remaining part of the coil, or second part of the coil is wound in an integer number of turns and is placed inside the test system ( 30) represented in Figure 1 1, so that it is subject to the relative influence of the external fields created by the system conductors (31, 32, 33, 34).
  • the second part of the coil, arranged inside the test system (30) should not measure anything, since no conductor coils, that is, there is no conductor inside the loop of As you create.
  • VF the current (in kA) of a conductor measured by means of a shunt (40) is represented by the conventional Rogowski coil (41) and by each of the two Rogowski coils according to the invention, one with serial configuration (42) and one with parallel configuration (43), and without applying external field.
  • An enlarged detail of the upper part of the curves is shown in Figure 13A, to better appreciate the differences between them.
  • the graph of Figure 13B shows a very enlarged detail of the graph of Figure 12 during the flat-top of the stream. It can be seen that the measured current is not completely constant, but has a curl of 0.1% with a frequency of Approximately 1 kHz, because switching power supplies have been used. It is observed in this figure that the measurement accuracy in the phase is much better in the case of the coils according to the invention (42, 43), as can be seen from the comparison with the current measured by the shunt (40). On the contrary, the current measured by the commercial coil (41) has a lag of almost 180 degrees at the frequency shown.
  • the graph in Figure 14, labeled TF, shows the influence of an applied external toroidal field of approximately 1 Tesla, together with a poloidal field of approximately 0.5 Tesla.
  • the magnitude of the fields is approximate in the sense that they are not uniform fields and have significant gradients, so that different parts of the Rogowski coils may be subject to different influences. It can be seen that all the coils tested: the two Rogowski coils according to the invention and the commercial Rogowski coil measure field when they should not, since in the experiment there was no conductor arranged in the loop of the coils.
  • the commercial coil (41) is much more sensitive to the influence of the external fields than the Rogowski coils according to the invention, which greatly reduce the effect of the external fields on the measurements made.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

La présente invention concerne une bobine de Rogowski et un procédé de mesure du courant circulant dans un conducteur réalisé au moyen de ladite bobine, cette même bobine de Rogowski (10) comprenant un tube (1) à section sensiblement constante, comportant une première extrémité et une seconde extrémité, ledit tube (1) étant conçu de sorte que ses extrémités puissent se rapprocher l'une de l'autre pour former une boucle toroïdale en situation d'utilisation, et une pluralité de conducteurs électriques (2, 3) qui comprennent chacun au moins un fil conducteur (2A, 3A), lesdits fils conducteurs étant isolés électriquement les uns par rapport aux autres, les conducteurs électriques (2, 3) assurant qu'ils sont enroulés sur la surface extérieure du tube (1), avec le même nombre de conducteurs enroulés dans le sens horaire (2) que dans le sens antihoraire (3), qu'ils sont répartis uniformément sur le tube (1) et que les conducteurs enroulés dans le sens horaire (2) et les conducteurs enroulés dans le sens antihoraire (3) sont entrecroisés.
PCT/ES2013/070385 2012-06-15 2013-06-14 Bobine de rogowski et procédé de mesure du courant circulant dans un conducteur WO2013186420A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ESP201230938 2012-06-15
ES201230938A ES2438618B8 (es) 2012-06-15 2012-06-15 Bobina de Rogowski y procedimiento para medir la corriente que circula por un conductor

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WO2013186420A1 true WO2013186420A1 (fr) 2013-12-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020015949A1 (fr) * 2018-07-20 2020-01-23 Siemens Aktiengesellschaft Dispositif comprenant une corde conductrice hélicoïdale ainsi que procédé pour la fabrication d'un tel dispositif

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3117600B1 (fr) 2020-12-14 2022-12-23 Safran Electrical & Power Capteur de courant bobiné deux en un
WO2024081826A2 (fr) * 2022-10-14 2024-04-18 Massachusetts Institute Of Technology Bobine de rogowski à courant de plasma à paire torsadée

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5012125A (en) * 1987-06-03 1991-04-30 Norand Corporation Shielded electrical wire construction, and transformer utilizing the same for reduction of capacitive coupling
US6313623B1 (en) * 2000-02-03 2001-11-06 Mcgraw-Edison Company High precision rogowski coil
JP2008241479A (ja) * 2007-03-27 2008-10-09 Matsushita Electric Works Ltd 電流センサ
US20080303511A1 (en) * 2005-11-28 2008-12-11 Ladislav Grno Precision flexible current sensor
JP2010256093A (ja) * 2009-04-22 2010-11-11 Nippon Soken Inc 電流センサ装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5012125A (en) * 1987-06-03 1991-04-30 Norand Corporation Shielded electrical wire construction, and transformer utilizing the same for reduction of capacitive coupling
US6313623B1 (en) * 2000-02-03 2001-11-06 Mcgraw-Edison Company High precision rogowski coil
US20080303511A1 (en) * 2005-11-28 2008-12-11 Ladislav Grno Precision flexible current sensor
JP2008241479A (ja) * 2007-03-27 2008-10-09 Matsushita Electric Works Ltd 電流センサ
JP2010256093A (ja) * 2009-04-22 2010-11-11 Nippon Soken Inc 電流センサ装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020015949A1 (fr) * 2018-07-20 2020-01-23 Siemens Aktiengesellschaft Dispositif comprenant une corde conductrice hélicoïdale ainsi que procédé pour la fabrication d'un tel dispositif
US11378596B2 (en) 2018-07-20 2022-07-05 Siemens Energy Global GmbH & Co. KG Arrangement having a spiraled conductor strand, and method for producing such an arrangement

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Publication number Publication date
ES2438618B8 (es) 2014-09-10
ES2438618A1 (es) 2014-01-17
ES2438618B1 (es) 2014-08-21

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