WO2011003977A1 - Ensemble capteur de courant - Google Patents

Ensemble capteur de courant Download PDF

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Publication number
WO2011003977A1
WO2011003977A1 PCT/EP2010/059820 EP2010059820W WO2011003977A1 WO 2011003977 A1 WO2011003977 A1 WO 2011003977A1 EP 2010059820 W EP2010059820 W EP 2010059820W WO 2011003977 A1 WO2011003977 A1 WO 2011003977A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
tracks
substrates
coil assembly
current sensor
Prior art date
Application number
PCT/EP2010/059820
Other languages
English (en)
Inventor
Eoin O'loughlin
Original Assignee
Suparules Limited
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 Suparules Limited filed Critical Suparules Limited
Publication of WO2011003977A1 publication Critical patent/WO2011003977A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H01F17/0033—Printed inductances with the coil helically wound around a magnetic core
    • 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
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H01F2017/006—Printed inductances flexible printed inductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • H01F2027/2809—Printed windings on stacked layers
    • 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

  • a Current Sensor Assembly Field of the Invention This invention relates to a current sensor of the type comprising a current transformer, and a coil assembly for such a current sensor.
  • a current transformer (CT) has long been one of the
  • a CT is designed to provide a current in its secondary winding proportional to the current in its primary winding.
  • a CT also isolates the measuring instrument from what may be very high voltage in the primary circuit. CTs are commonly used in metering and for protection and measurement in the electrical power industry.
  • a current transformer has a primary winding, a magnetic core, and a secondary winding. An alternating current flowing in the primary winding produces a magnetic field in the core, which then induces current flow in the secondary winding circuit.
  • a common design of CT Figure 1
  • CT comprises a length of wire 10 wrapped many times around an annular magnetic core 12 surrounding a conductor 14 through which flows the current I being measured.
  • the CT ' s primary winding therefore consists of a single "turn" of the conductor 14, with the secondary winding 16 consisting typically of a multiple number of turns of the wire 10.
  • a known type of current transformer has a magnetic core comprising a flexible metal strip (e.g. silicon steel) which can be formed into a closed loop around the primary conductor. This allows the CT to be fixed around the primary conductor without the need to break the primary conductor circuit, thereby allowing the CT to be introduced onto a live conductor.
  • magnetic core can be omitted and an air core is employed. It is an object of the invention to provide an improved flexible CT-type current sensor.
  • the invention provides a coil assembly for a current sensor comprising two flexible substrates of insulating material disposed face to face and joined along opposite edges, and a plurality of conductive tracks extending across each substrate transversely between the opposite edges, wherein the ends of the tracks on one substrate are electrically connected to the ends of the tracks on the other substrate, wherein the flexible substrates are arranged to receive a body of material sandwiched between the substrates, and wherein the conductive tracks are arranged in such a way as to form a continuous winding around the body to be received between the substrates.
  • the invention further provides a current sensor comprising the flexible coil assembly and a body of material
  • the current sensor comprises a flexible body of material. This may be formed from any suitable flexible material .
  • the body of material is a magnetic body.
  • the coil may employ an inert body to give it shape and to provide coil spacing (so that it has in effect an "air core")
  • the preferred embodiment employs a flexible body of magnetic material, for example silicon steel .
  • the substrates and body are provided around a conductor whose current is to be sensed such that the tracks are at least approximately parallel to the
  • the ends of the tracks are connected through via holes in the substrates.
  • the two facing substrates may be formed from a single flexible sheet by folding, or from two flexible sheets secured along opposite edges. Where the facing substrates are formed from a single flexible sheet by folding along the folded edge, the tracks extend continuously across the fold from one substrate to the other.
  • Figure 1 previously described, shows a prior art CT-type current sensor.
  • Figures 2 and 3 are plan views of first and second flexible PCB substrates used in the manufacture of the embodiment.
  • Figure 4 is a plan view of the substrates of Figures 2 and 3 joined edge to edge.
  • Figure 5 is an end view of the structure of Figure 4.
  • Figures 6 and 7 show how a ferromagnetic strip is inserted between the PCB substrates.
  • Figure 8 shows how the structure of Figure 7 is bent round to form the completed current sensor.
  • Each substrate has a pair of opposite substantially parallel edges 24, 26 and a pair of opposite substantially parallel ends 28, 30.
  • a plurality of parallel conductive tracks 32, 34 are printed (or similarly formed) on the substrates 20, 22 respectively.
  • the tracks 32 or 34 extend transversely across the substrate between the opposite edges 24, 26.
  • the track pitch is substantially the same on each substrate.
  • the tracks 34 on the substrate 22 may be substantially normal to the edges 24, 26 of that substrate, while the tracks 32 on the substrate 20 may be inclined at a very small angle to the normal so that the ends of the tracks 32 at the edge 24 are displaced by one track pitch period relative to the other ends of the tracks 32 at the edge 26.
  • Each track 32, 34 terminates at one end in a respective conductive pad 36 and at the other end in a respective conductive pad 38.
  • the printed substrates 20, 22 may be manufactured using the technology used for making flexible printed multi-conductor cables for automobile electrics and other electrical equipment.
  • the two substrates 20, 22 are disposed in register face-to-face with the tracks 32, 34 on the outside surfaces of the substrates, i.e. the tracks are separated by the thickness of both substrates (tracks 32 shown in broken-line outline) .
  • the pads 36 on the substrate 20 are in register with the pads 36 on the substrate 22, and likewise the pads 38 on the substrate 20 are in register with the pads 38 on the substrate 22.
  • the substrates 20, 22 may be arranged in any suitable adjacent relationship, provided that the tracks 32, 34 are insulated from each other.
  • the substrates are joined along their opposite edges 24 and 26 by plated through-holes (vias) 40, Figure 5.
  • the vias 40 contain electrically conductive material which connect each pad 36 on the substrate 20 with the corresponding aligned pad 36 on the substrate 22 and each pad 38 on the substrate 20 with the corresponding aligned pad 38 on the substrate 22.
  • a continuous electrical path is formed around the two substrates which can be regarded as a "flat helix”. Opposite ends of the path are connected
  • the joining of the substrates 20, 22 may be strengthened by glue layers 48 (shown in dotted line outline in Figure 4) or a similar bonding mechanism disposed between the glue layers 48 (shown in dotted line outline in Figure 4) or a similar bonding mechanism disposed between the glue layers 48 (shown in dotted line outline in Figure 4) or a similar bonding mechanism disposed between the glue layers 48 (shown in dotted line outline in Figure 4) or a similar bonding mechanism disposed between the glue layers 48 (shown in dotted line outline in Figure 4) or a similar bonding mechanism disposed between the glue layers 48 (shown in dotted line outline in Figure 4) or a similar bonding mechanism disposed between the glue layers 48 (shown in dotted line outline in Figure 4) or a similar bonding mechanism disposed between the glue layers 48 (shown in dotted line outline in Figure 4) or a similar bonding mechanism disposed between the glue layers 48 (shown in dotted line outline in Figure 4) or a similar bonding mechanism disposed between the glue layers 48 (shown in
  • the two substrates 20, 22 are deformed as shown in Figure 6, and a flexible strip 50 of ferromagnetic material is inserted into the gap between the substrates, as shown in cross section in Figure 7 (in Figure 7 the thickness of the strip 50 is - exaggerated) .
  • the strip 50 may extend substantially the full length of the substrates 20 and 22, i.e. substantially from one end 28 to the other end 30, or at least along the major part thereof between the tracks 32, 34.
  • the strip 50 may be substantially longer than the length of the substrates 20, 22, such that the substrates 20, 22 are provided about a portion of the strip 50.
  • helical conductor formed by the tracks on the substrates, interconnected by the vias, representing a continuous coil winding around the core.
  • strip 50 of material is ferromagnetic in this embodiment
  • an alternative approach is to use a strip of non-magnetic material to provide similar structural
  • the sensor may normally be stocked "flat", i.e. as shown in Figure 7.
  • the entire structure can be wrapped round a conductor 52 whose current is to be sensed such that the tracks 32, 34 are at least approximately parallel to the conductor, Figure 8.
  • the free ends of the structure may be joined together to form a continuous magnetic core ring. In the embodiment shown in Figure 8, the ends 28, 30 of the substrates overlap
  • the two facing substrates 20, 22 are formed by folding a single substantially
  • conductive clips which embrace the edges of the substrates. Such clips would not only electrically connect the ends of the tracks, but may also serve to secure the edges of the substrates together.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

L'invention concerne un ensemble bobine pour capteur de courant, comprenant une paire de substrats souples (20, 22) en matériau isolant disposés face à face et joints le long de bords opposés (24, 26), et une pluralité de pistes conductrices (32, 34) s’étendant transversalement sur chaque substrat entre les bords opposés. Les extrémités des pistes situées sur un substrat sont électriquement connectées aux extrémités des pistes situées sur l’autre substrat, les substrats souples étant agencés de façon à recevoir un corps de matériau (de préférence un matériau magnétique) pris en sandwich entre les substrats pour constituer un capteur de courant. Les pistes conductrices sont agencées de façon à former un enroulement continu autour du corps prévu pour être reçu entre les substrats.
PCT/EP2010/059820 2009-07-08 2010-07-08 Ensemble capteur de courant WO2011003977A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IES2009/0519 2009-07-08
IE20090519 2009-07-08

Publications (1)

Publication Number Publication Date
WO2011003977A1 true WO2011003977A1 (fr) 2011-01-13

Family

ID=42938420

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/059820 WO2011003977A1 (fr) 2009-07-08 2010-07-08 Ensemble capteur de courant

Country Status (2)

Country Link
IE (1) IES20100423A2 (fr)
WO (1) WO2011003977A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19740428A1 (de) * 1997-09-10 1999-03-18 Siemens Ag Ringförmige Spule mit kreisförmigem Windungsquerschnitt und Verfahren zu ihrer Herstellung
US20040090301A1 (en) * 1997-09-12 2004-05-13 Ertugrul Berkcan Apparatus and methods for forming torodial windings for current sensors
US20050134290A1 (en) * 2003-12-23 2005-06-23 Sarkozi Janos G. Current transformers for partial discharge detection on aircraft cables and wires
US20060109071A1 (en) * 2004-11-19 2006-05-25 Thongsouk Christopher H Circuit board inductor
US20070124916A1 (en) * 2000-05-19 2007-06-07 Harding Philip A Method of making slotted core inductors and transformers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19740428A1 (de) * 1997-09-10 1999-03-18 Siemens Ag Ringförmige Spule mit kreisförmigem Windungsquerschnitt und Verfahren zu ihrer Herstellung
US20040090301A1 (en) * 1997-09-12 2004-05-13 Ertugrul Berkcan Apparatus and methods for forming torodial windings for current sensors
US20070124916A1 (en) * 2000-05-19 2007-06-07 Harding Philip A Method of making slotted core inductors and transformers
US20050134290A1 (en) * 2003-12-23 2005-06-23 Sarkozi Janos G. Current transformers for partial discharge detection on aircraft cables and wires
US20060109071A1 (en) * 2004-11-19 2006-05-25 Thongsouk Christopher H Circuit board inductor

Also Published As

Publication number Publication date
IES20100423A2 (en) 2011-01-19

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