EP0704867A1 - Auslösevorrichtung mit mindestens einem Stromwandler - Google Patents

Auslösevorrichtung mit mindestens einem Stromwandler Download PDF

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Publication number
EP0704867A1
EP0704867A1 EP95410110A EP95410110A EP0704867A1 EP 0704867 A1 EP0704867 A1 EP 0704867A1 EP 95410110 A EP95410110 A EP 95410110A EP 95410110 A EP95410110 A EP 95410110A EP 0704867 A1 EP0704867 A1 EP 0704867A1
Authority
EP
European Patent Office
Prior art keywords
shunt
current
circuit
air gap
magnetic
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.)
Granted
Application number
EP95410110A
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English (en)
French (fr)
Other versions
EP0704867B1 (de
Inventor
Pascal Houbre
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric SE
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 Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0704867A1 publication Critical patent/EP0704867A1/de
Application granted granted Critical
Publication of EP0704867B1 publication Critical patent/EP0704867B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • H01F38/08—High-leakage transformers or inductances
    • 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
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/123—Automatic release mechanisms with or without manual release using a solid-state trip unit
    • H01H71/125—Automatic release mechanisms with or without manual release using a solid-state trip unit characterised by sensing elements, e.g. current transformers

Definitions

  • current transformers supply the electrical energy necessary for the operation of associated electrical or electronic circuits at own current.
  • Current transformers are installed on conductors of a power circuit to be protected. They supply low-intensity secondary currents proportional to very high primary currents to electronic tripping circuits.
  • the alternating secondary currents are rectified and regulated in order to supply continuous supply voltages to the tripping circuits.
  • the consumption of the circuits being stable or little variable, the excess energy supplied by the transformers is dissipated by regulation circuits and by the transformers themselves.
  • the minimum secondary operating current corresponds to the consumption of the tripping circuits.
  • operation must usually be ensured between 0.1 and 10 times the rated current.
  • the devices must include large transformers capable of dissipating the excess energy transformed into heat.
  • the electronic power components of the regulation circuits must be oversized and fixed on bulky cooling devices.
  • Saturated iron current transformers reduce the secondary current at high current levels and limit the power supplied to the regulation circuits.
  • the operation of the saturated iron transformers does not make it possible to effectively resolve the problems of size and heating over the entire operating range of the trip device.
  • the object of the invention is a trip device comprising at least one current transformer providing reduced power at high primary current.
  • the transformer comprises a magnetic shunt disposed as a bypass on the part of the main magnetic circuit constituting the core of the secondary winding, the magnetic shunt comprising a total or partial air gap locally reducing the section of said shunt.
  • the current response of said transformer is not linear over the entire operating range.
  • the magnetic shunt is positioned between the primary conductor and the secondary winding.
  • the section of the magnetic shunt near the air gap is greater than the section of the magnetic circuit at the location of the core of the secondary winding.
  • the size of the air gap can vary in different places of the shunt section.
  • the air gap can be located substantially in the middle of the magnetic shunt or between the shunt and the main magnetic circuit.
  • the shunt and the main magnetic circuit form the same part.
  • At least one secondary winding comprises an electromagnetic shielding.
  • said current transformer essentially supplying the operating electrical energy, is associated with a current measurement sensor.
  • the current measurement sensor is preferably a Rogowski torus.
  • FIG. 1 represents a block diagram of a tripping device installed in a circuit breaker.
  • FIG. 2 represents a known current transformer.
  • FIG. 3 represents a current transformer according to an embodiment of the invention which can be part of a trip device according to FIG. 1.
  • FIGs 4 and 5 show two variants of current transformers according to Figure 3.
  • FIG. 6 represents the curves of the current responses of the transformers of FIGS. 2 and 3.
  • Figures 7a, 7b and 7c illustrate the currents for a particular point on curve 6.
  • Figures 8 to 11 show air gap variants of the current transformers of Figures 3 to 5.
  • FIG. 12 shows a transformer according to an embodiment of the invention associated with a rogowski toroid.
  • the block diagram in FIG. 1 represents a trip device installed in a circuit breaker to protect an electrical network 1 against overloads or short-circuits.
  • the opening of contacts 2 is controlled by a relay 3.
  • the triggering device comprises current transformers 4a, 4b and 4c associated with the network conductors to supply the electrical energy necessary for the operation of electronic circuits of a processing unit 25.
  • the windings secondary current transformers are connected to a supply circuit 5 which rectifies the alternating current supplied by the secondary windings of the transformers and provides one or more regulated DC voltages.
  • a first DC voltage V1 is supplied to measurement and processing circuits, respectively 6 and 7, while a second DC voltage V2 supplies the relay 3.
  • the processing unit 25 comprises the relay 3 and the circuits 5, 6 and 7.
  • Sensors 8a, 8b and 8c for measuring current, associated with the conductors of the network have secondary windings connected to the measurement circuit 6.
  • the circuit 6 amplifies and formats signals representative of the currents of the conductors coming from the sensors 8a, 8b and 8c. Then, it sends them to the processing circuit 7.
  • the circuit 7 sends a trigger order 9 when the signals representative of the conductor currents exceed predetermined thresholds for predetermined times.
  • the sensors 8a, 8b and 8c can be, for example, measurement transformers, Rogowski toroids or Hall effect cells.
  • FIG. 2 represents a known current transformer which can be used as transformers 4a, 4b or 4c.
  • Said known current transformer comprises a magnetic circuit 10 and a secondary winding represented by a coil 11 and two output wires 12.
  • the magnetic circuit generally consisting of stacked sheets, completely surrounds a conductor 13 of the network 1 where the primary current of the transformer.
  • a part 14 of the magnetic circuit 10 passes through the center of the secondary winding and forms the core of the coil 12.
  • the transformers 4a, 4b and 4c of the triggering device of FIG. 1 are current transformers comprising a magnetic shunt to be gap.
  • Figure 3 shows an embodiment of a transformer of this type.
  • a magnetic shunt 15, bypassed on the magnetic core 14 of the secondary winding, has a gap 16.
  • Figures 4 and 5 show variants of transformers according to two other embodiments of the invention.
  • the part of the magnetic circuit surrounding the primary conductor has a rounded shape comprising the magnetic shunt 15.
  • the transformer of FIG. 4 has an air gap located substantially in the middle of the shunt.
  • the air gap of the transformer of Figure 5 is located between one end of the shunt and a part of the main magnetic circuit 10 connecting an area close to the primary conductor and the core of the secondary winding.
  • the section of the magnetic shunt 15 near the air gap is greater than the section of the magnetic circuit at the location of the core 14 of the secondary winding.
  • the main magnetic circuit 10 and the shunt 15 form a single piece. Said part can be constituted by stacked sheets or by other magnetic materials.
  • a first curve 17 represents the response in rms current of a known type of transformer not having of shunt. The shape of curve 17 is almost linear. The secondary current Is is substantially proportional to the primary current Ip.
  • a second curve, 18, represents the effective current response of a transformer according to an embodiment of the invention comprising an air gap shunt.
  • the secondary currents of the two transformers corresponding to curves 17 and 18 have similar values.
  • the response curve 18 of the transformer comprising an air gap shunt becomes smaller than the curve 17 of the transformer without shunt. For example, for a current of 800A the transformer with a shunt to gap, provides a secondary current of the order of 0.25 A (point 19 on curve 18) while the transformer without shunt provides a current of 0.8 AT.
  • the shapes of the primary and secondary currents are illustrated on the curves of Figures 7a, 7b and 7c.
  • the primary sinusoidal current Ip having a value of 800 A, passes through the primary of a first transformer according to FIG. 2 and the primary of a second transformer according to FIG. 3.
  • FIG. 7b shows a secondary current Is1 of the first transformer.
  • the effective value of the current Is1 is 0.8 A and its shape is substantially sinusoidal.
  • FIG. 7c shows a secondary current Is2 of the second transformer comprising a magnetic shunt according to an embodiment of the invention.
  • the current Is2 is deformed and its value, approximately 0.25 A, is much lower than that of the current Is1.
  • For a primary current Ip 800 A the power dissipated in the secondary winding of the first transformer without shunt is 9 W while the power dissipated in the winding of the second transformer comprising a magnetic shunt is only 0.9W.
  • the response, of the secondary current Is as a function of the primary current Ip, of the transformers comprising a shunt with an air gap depends on the shape, the surface and the thickness of the air gap.
  • the transformers of FIGS. 3 to 5 have air gaps of constant thickness and opening the entire section of the shunts 15. However, other forms of air gap are possible.
  • Figures 8 to 11 show various air gap variants.
  • the thickness of the air gap can be variable to improve the response at high current level.
  • Figure 8 shows an air gap having a different thickness at different places in the section of the shunt.
  • Figure 9 shows a shunt with a partial air gap.
  • a large part of the magnetic circuit of the shunt is cut by the air gap and a small part remains connected.
  • the attenuation begins with lower primary currents.
  • the magnetic shunt 15 may comprise several air gaps, for example a total air gap 16 a and a partial air gap 16 b as shown in FIG. 10.
  • FIG. 11 represents a shunt comprising a complex air gap.
  • the air gap comprises a first part 21 and a second transverse part 22 and a longitudinal part 23 connecting the first and second transverse parts.
  • the effects of the air gap being essentially in the longitudinal part, this arrangement makes it possible to have a large air gap area and a large circulation of the magnetic flux at high primary current.
  • the air gap of the magnetic shunt is generally a notch left in the open air but it can be completely or partially filled with a solid non-magnetic material.
  • the air gap of the longitudinal part 23 of the shunt of FIG. 11 comprises a solid non-magnetic component 24. Said solid non-magnetic component prevents impurities from getting into the thickness of the air gap.
  • a thin air gap can advantageously consist of a screen made of solid non-magnetic material.
  • the primary conductor 13 crosses the magnetic circuit of a transformer according to the invention and the center of a Rogowski toroid 26.
  • the secondary of the first transformer according to the invention supplies electronic circuits and the secondary of the toroid de Rogowski supplies measurement and processing circuits with the signal representative of the current flowing in the primary conductor.
  • the Rogowski transformer and toroid are preferably fixed to each other, for example by overmolding.
  • the device in FIG. 12 includes an electromagnetic shield 27.
  • the current transformers of a device according to the invention can have very varied shapes.
  • the shunt with air gap is disposed between the primary conductor and the secondary winding.
  • the secondary winding would then be between the primary conductor and the shunt. This arrangement may be advantageous depending on the volume allocated to the current transformer.
  • a transformer according to the invention may comprise a magnetic circuit with a core of the secondary winding comprising a partial or total air gap and a magnetic shunt also comprising a partial or total air gap. This arrangement can make it possible to better distribute the magnetic flux between the shunt and the core as a function of the value of the primary current.
  • the transformers comprise a single secondary winding, and a single shunt, but the invention also applies to devices comprising transformers with several secondary windings and / or with several shunts.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
EP95410110A 1994-09-29 1995-09-19 Auslösevorrichtung mit mindestens einem Stromwandler Expired - Lifetime EP0704867B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9411814A FR2725320B1 (fr) 1994-09-29 1994-09-29 Dispositif de declenchement comportant au moins un transformateur de courant
FR9411814 1994-09-29

Publications (2)

Publication Number Publication Date
EP0704867A1 true EP0704867A1 (de) 1996-04-03
EP0704867B1 EP0704867B1 (de) 1999-12-01

Family

ID=9467528

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95410110A Expired - Lifetime EP0704867B1 (de) 1994-09-29 1995-09-19 Auslösevorrichtung mit mindestens einem Stromwandler

Country Status (9)

Country Link
US (1) US5726846A (de)
EP (1) EP0704867B1 (de)
JP (1) JP3868522B2 (de)
KR (1) KR100337677B1 (de)
CN (1) CN1052103C (de)
DE (1) DE69513612T2 (de)
ES (1) ES2139865T3 (de)
FR (1) FR2725320B1 (de)
MY (1) MY113940A (de)

Cited By (3)

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EP0859395A3 (de) * 1997-02-07 1999-04-14 Siemens Aktiengesellschaft Niederspannungs-Leistungsschalter mit Wahlweise einbaubarem Messwandler
WO2020070316A1 (en) * 2018-10-05 2020-04-09 Abb Schweiz Ag Magnetic core arrangement, inductive device and installation device
EP3613066A4 (de) * 2017-04-19 2020-12-02 Narayan Powertech Pvt. Ltd. Stromwandler mit stromzweigen auf primärleiter

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GB9612504D0 (en) * 1996-06-14 1996-08-14 Smiths Industries Ltd Current transformer assemblies
CA2333616A1 (en) * 1998-05-07 1999-11-11 Airpax Corporation, L.L.C. Ac current sensor having high accuracy and large bandwidth
FR2802017B1 (fr) 1999-12-03 2004-05-14 Schneider Electric Ind Sa Appareillage de coupure triphase de forte intensite a deux poles jumeles par phase, muni de circuits magnetiques de compensation
US6433981B1 (en) * 1999-12-30 2002-08-13 General Electric Company Modular current sensor and power source
US6459349B1 (en) 2000-03-06 2002-10-01 General Electric Company Circuit breaker comprising a current transformer with a partial air gap
DE10240351A1 (de) * 2002-08-28 2004-03-11 Siemens Ag Wandleranordnung zur Speisung eines Auslösemagneten
EP1647498A1 (de) 2003-07-23 2006-04-19 Kiyari Co. Ltd. Schale für tiefgefrorene nahrungsmittel, verpackung für tiefgefrorene nahrungsmittel, verpackung für tiefgefrorenes sushi und verfahren zum auftauen von tiefgefrorenem sushi
US8355230B2 (en) * 2003-12-08 2013-01-15 Siemens Industry, Inc. Extended instantaneous protection
ITBG20030062A1 (it) * 2003-12-30 2005-06-30 Abb Service Srl Dispositivo di alimentazione per un dispositivo di protezione elettronico da impiegarsi in un interruttore di bassa tensione.
US8538560B2 (en) * 2004-04-29 2013-09-17 Rosemount Inc. Wireless power and communication unit for process field devices
US7561387B2 (en) * 2005-10-19 2009-07-14 Eaton Corporation Current transformer including a low permeability shunt and a trip device employing the same
KR100792484B1 (ko) 2006-09-13 2008-01-08 피에스텍주식회사 전자식 전력 수급용 계기용 변성기
FR2910173B1 (fr) * 2006-12-18 2012-05-04 Schneider Electric Ind Sas Dispositif de mesure de courant a isolation electrique, declencheur electronique, et disjoncteur comportant un tel dispositif
FR2910162B1 (fr) * 2006-12-18 2009-12-11 Schneider Electric Ind Sas Dispositif de couplage de signal de mesure a isolation electrique et appareil electrique comportant un tel dispositif
AT506454B1 (de) * 2008-02-22 2015-10-15 Egston System Electronics Eggenburg Gmbh Wandleranordnung
EP2310918B1 (de) * 2008-06-17 2014-10-08 Rosemount, Inc. Rf adapter für feldgerät mit variabeln spannungsabfall
US8929948B2 (en) * 2008-06-17 2015-01-06 Rosemount Inc. Wireless communication adapter for field devices
US8694060B2 (en) 2008-06-17 2014-04-08 Rosemount Inc. Form factor and electromagnetic interference protection for process device wireless adapters
CA2726707C (en) * 2008-06-17 2016-01-19 Rosemount Inc. Rf adapter for field device with low voltage intrinsic safety clamping
DE102008049432B4 (de) * 2008-09-25 2018-02-08 Siemens Aktiengesellschaft Leistungsschalter und Stromwandler für einen Leistungsschalter
US8456782B2 (en) 2009-05-08 2013-06-04 Rockwell Automation Technologies, Inc. Cost effective design for a current transformer with an integrated magnetic actuator
EP2249368B1 (de) * 2009-05-08 2018-06-13 Rockwell Automation Technologies, Inc. Leistungsschaltersystem
US8681466B2 (en) 2009-05-08 2014-03-25 Rockwell Automation Technologies, Inc. Magnetic core coupling in a current transformer with integrated magnetic actuator
US9674976B2 (en) * 2009-06-16 2017-06-06 Rosemount Inc. Wireless process communication adapter with improved encapsulation
US8626087B2 (en) * 2009-06-16 2014-01-07 Rosemount Inc. Wire harness for field devices used in a hazardous locations
CN101908413B (zh) * 2010-07-27 2012-10-03 上海诺雅克电气有限公司 给电子装置供电用电流互感器
US10761524B2 (en) 2010-08-12 2020-09-01 Rosemount Inc. Wireless adapter with process diagnostics
DE102010061766A1 (de) 2010-11-23 2012-01-19 Siemens Aktiengesellschaft Schalter, insbesondere Leistungsschalter für Niederspannungen
CN102136358B (zh) * 2011-01-13 2012-12-19 上海诺雅克电气有限公司 电子式保护用供电电流互感器
CN102800471A (zh) * 2011-05-26 2012-11-28 北京人民电器厂有限公司 速饱和电流互感器
DE102011077707B4 (de) 2011-06-17 2015-02-12 Siemens Aktiengesellschaft Schalter, insbesondere Leistungsschalter, und Verfahren zum Auslösen eines Schalters
DE102011082170A1 (de) 2011-09-06 2013-03-07 Siemens Aktiengesellschaft Stromwandler
US9310794B2 (en) 2011-10-27 2016-04-12 Rosemount Inc. Power supply for industrial process field device
JP2013130447A (ja) * 2011-12-21 2013-07-04 Tamura Seisakusho Co Ltd 電流センサ用ループコア及び電流センサ
TR201809367T4 (tr) * 2014-02-06 2018-07-23 Abb Spa Önceden belirlenen bir akım eşiğine göre bir birincil iletkenin bir akımının izlenmesi için cihaz ve ilgili trip tertibatı ve anahtarlama cihazı.
CN105336484B (zh) 2014-08-06 2018-05-01 上海电科电器科技有限公司 电流互感器
US9953790B1 (en) * 2016-10-11 2018-04-24 Eaton Intelligent Power Limited Electrical switching apparatus and sensing assembly therefor
KR102003943B1 (ko) * 2018-01-25 2019-07-31 엘에스산전 주식회사 회로차단기의 파워 변류기 어셈블리
FR3089340B1 (fr) * 2018-11-29 2020-10-30 Schneider Electric Ind Sas Transformateur de courant, dispositif de protection et disjoncteur électrique comportant un tel transformateur
KR102153970B1 (ko) * 2018-12-26 2020-09-09 엘에스일렉트릭(주) 기중회로차단기의 변류기
DE102022202957A1 (de) * 2022-03-25 2023-09-28 Siemens Aktiengesellschaft DC/DC-Wandler
WO2024165239A1 (en) * 2023-02-10 2024-08-15 Eaton Intelligent Power Limited Power supply unit and circuit breaker

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EP0039485A1 (de) * 1980-05-07 1981-11-11 Licentia Patent-Verwaltungs-GmbH Zeilentransformator für einen Fernsehempfänger
EP0254464A1 (de) * 1986-07-17 1988-01-27 Vickers Systems Limited Elektrische Speisungsregelung

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GB1094225A (en) * 1964-06-19 1967-12-06 Oerlikon Maschf Improvements relating to current transformers
DE1638602B1 (de) * 1967-09-12 1970-09-24 Siemens Ag Stromwandler mit einem Eisenkernsystem,das einen mittels mindestens eines Luftspaltes gescherten Eisenkern enthaelt
US3962661A (en) * 1975-04-22 1976-06-08 International Telephone And Telegraph Corporation Magnetically shunted current transformer
EP0012629A1 (de) * 1978-12-19 1980-06-25 Fanuc Ltd. Drosselspulen
WO1981001218A1 (en) * 1979-10-26 1981-04-30 S Trolle An inductance coil having a core of magnetic material
EP0039485A1 (de) * 1980-05-07 1981-11-11 Licentia Patent-Verwaltungs-GmbH Zeilentransformator für einen Fernsehempfänger
EP0254464A1 (de) * 1986-07-17 1988-01-27 Vickers Systems Limited Elektrische Speisungsregelung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0859395A3 (de) * 1997-02-07 1999-04-14 Siemens Aktiengesellschaft Niederspannungs-Leistungsschalter mit Wahlweise einbaubarem Messwandler
EP3613066A4 (de) * 2017-04-19 2020-12-02 Narayan Powertech Pvt. Ltd. Stromwandler mit stromzweigen auf primärleiter
US12374487B2 (en) 2017-04-19 2025-07-29 Narayan Powertech Pvt. Ltd. Current transformer with current branches on primary conductor
WO2020070316A1 (en) * 2018-10-05 2020-04-09 Abb Schweiz Ag Magnetic core arrangement, inductive device and installation device

Also Published As

Publication number Publication date
ES2139865T3 (es) 2000-02-16
KR960012057A (ko) 1996-04-20
MY113940A (en) 2002-06-29
DE69513612D1 (de) 2000-01-05
KR100337677B1 (ko) 2002-10-31
CN1052103C (zh) 2000-05-03
FR2725320B1 (fr) 1996-10-31
CN1129347A (zh) 1996-08-21
JP3868522B2 (ja) 2007-01-17
DE69513612T2 (de) 2000-05-31
US5726846A (en) 1998-03-10
JPH08180790A (ja) 1996-07-12
EP0704867B1 (de) 1999-12-01
FR2725320A1 (fr) 1996-04-05

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