EP1276121A2 - Transformateur de courant - Google Patents

Transformateur de courant Download PDF

Info

Publication number
EP1276121A2
EP1276121A2 EP02015110A EP02015110A EP1276121A2 EP 1276121 A2 EP1276121 A2 EP 1276121A2 EP 02015110 A EP02015110 A EP 02015110A EP 02015110 A EP02015110 A EP 02015110A EP 1276121 A2 EP1276121 A2 EP 1276121A2
Authority
EP
European Patent Office
Prior art keywords
post insulator
magnetic field
current transformer
field sensor
ring
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.)
Pending
Application number
EP02015110A
Other languages
German (de)
English (en)
Other versions
EP1276121A3 (fr
Inventor
Thomas Göhlsch
Christian Vetter
Alexander Eigner
Franz Leitsch
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.)
Elektrotechnische Werke Fritz Driescher & Sohne GmbH
Original Assignee
Elektrotechnische Werke Fritz Driescher & Sohne GmbH
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 Elektrotechnische Werke Fritz Driescher & Sohne GmbH filed Critical Elektrotechnische Werke Fritz Driescher & Sohne GmbH
Publication of EP1276121A2 publication Critical patent/EP1276121A2/fr
Publication of EP1276121A3 publication Critical patent/EP1276121A3/fr
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means

Definitions

  • the invention relates to a current transformer for measurement and protection purposes in Hochoder Medium-voltage networks with busbars guided in post insulators.
  • Such a current transformer is used to detect what is conducted via the line network Electricity to measure electricity consumption or connected components to protect against energy peaks, i.e. it is designed as a measuring or protective transformer.
  • a voltage transducer is usually also provided, with a Meter or relay is supplied with the measured current or voltage values. This measuring device or relay then detects from the measured values whether a impermissibly high power is carried over the network and prevents if necessary damage to connected electrical components due to an interruption the connection.
  • the current transformers conventionally used for this are based on the transformer principle built up, i.e. such a current transformer has a primary and a secondary winding on, with a proportional to the conductor current in the secondary winding Electricity is generated.
  • the resulting benefits are then from Relay added and used to assess the current network performance.
  • a major disadvantage of these known transformer current transformers lies in that they have a considerable size and a corresponding weight. she are thus inconvenient to handle during assembly and especially increase confined space, valuable installation space.
  • Such deliver Transformer current transformer relatively high output signal powers, which for relays newer generations are too high. The output powers of such transducers are therefore either reduced by changing the transformer arrangement accordingly adjusts, but this leads to an increase in the design, or they are before Relay so unused that only the desired input power at the relay is applied.
  • the invention is therefore based on the object of a current transformer for measurement and To provide protective purposes on high or medium voltage networks, its size is significantly reduced compared to the prior art.
  • a current transformer with the features of the claim 1 solved.
  • This is particularly characterized in that a busbar in the area of the head of a post insulator at a distance from one that is not closed Ring of magnetically conductive material is surrounded, which is within the material of the Post insulator is arranged that in the gap between the open ends of the ring Magnetic field sensor is also arranged within the material of the post insulator, and that the leads of the magnetic field sensor through the body of the post insulator out to its foot and can be tapped there.
  • a construction of a current transformer is shown for the first time, which can be integrated in a body in the form of a post insulator.
  • a particularly compact design is also the other Advantage achieved that the connecting lines of the magnetic field sensor by the anyway existing length of the post insulator with sufficient insulation distance from the conductor rail be tapped, so that mutual interference is excluded here can be.
  • the one integrated according to the invention in a support insulator body differs
  • the design of current transformers is not, or only insignificantly, that of conventional ones Post insulators, so that this is also the usual support function for the busbar can take over.
  • the current transformer according to the invention thus combines the Functionality of a conventional post insulator with the measuring function for the at the Conducted rail current.
  • the magnetic field sensor according to the invention despite of the high current to be measured delivers a low-power signal, which as a rule directly by a downstream relay or a corresponding measuring device can be processed. Further adjustment steps of the signals to the downstream ones Measuring devices etc. are therefore not necessary.
  • the current transformer according to the invention is also characterized by its high dielectric strength.
  • partial discharges could destroy the Lead current transformer.
  • the construction of the invention is a first Isolation gap between the busbar and the ring and a second isolation gap provided between the ring and the magnetic field sensor. With a corresponding geometric Dimensioning can thus be a direct breakdown between the conductor rail and magnetic field sensor can be reliably avoided.
  • a current transformer similar in principle of measurement is already from the DE 44 46 258 A1 known.
  • This current transformer has a soft magnetic, however electrically non-conductive core directly on a high-voltage side primary winding on.
  • the core is annular and not closed in such a way that A magnetic field-dependent sensor is arranged in the gap between the ends is by means of which a signal analog to the current carried can be detected.
  • the magnetic field sensor is preferably designed as a Hall sensor, since this is via a wide bandwidth a well usable signal for subsequent measuring devices supplies.
  • a Hall sensor detects all current currents in the same way Way, since it has no iron core, so there is no saturation effect. moreover can therefore fall back on a proven measuring device.
  • the post insulator - in a manner known per se - is screwed to the base with a support rail, the one intended for earthing Connection cable of the magnetic field sensor electrically with that provided for the screw connection Screw socket is connected in the post insulator.
  • the ring is dimensioned so that in the measuring range of the magnetic field sensor No magnetic saturation occurs, the possible area of application and reliability of the current transformer according to the invention can be further improved.
  • a current transformer 1 has a body in the form of a post insulator 2 having a head 21, a body 22 and one 23 foot.
  • a conductor rail 3 is guided through the head 21 of the post insulator 2, which is cast in the electrically insulating material of the post insulator 2.
  • Spaced around this busbar 3 is also within the material of the post insulator 2 a ring 4 made of magnetically conductive material.
  • the one in Fig. 1 not visible ring 4 is indicated schematically with cross hatching. Since the Ring 4 is not in direct contact with the busbar 3, it can also be from a be electrically conductive material.
  • the distance between the busbar 3 and the ring 4 are determined from the mains voltage conducted over the busbar 3 and the dielectric properties of the material of the post insulator 2, which is usually epoxy resin.
  • the ring 4 is not closed in the manner shown in FIG. 1, so that a There is a gap between the open ends of the ring 4. There is a in this gap Magnetic field sensor 5 arranged, which in this embodiment is designed as a Hall sensor is. Connection lines 6 lead away from the magnetic field sensor 5, wherein in FIG. 2 a ground line 61 and two signal lines 62 and 63 are shown. The connecting lines 6 are cast in the post insulator 2 and thus fixed therein, and from the area of the head in which the ring 4 and the magnetic field-dependent sensor 5 are arranged are passed through the body 22 to the foot 23 of the post insulator 2. It is therefore not necessary to pay attention to a specific routing of the connecting lines 6 become.
  • connection base 24 is formed with two connection sockets, which are connected to the two signal lines 62 and 63.
  • the connector base 24 points away from the main axis of the post insulator 2 and is offset by 90 ° arranged to the course of the busbar 3.
  • the ground line 61 is also with a screw bushing 25 which is concentric with the central axis of the post insulator 2 is embedded at the bottom of the foot 23.
  • the screw bushing 25 enables a direct attachment of the support insulator 2 to a carrier rail, not shown here or the like and simultaneously establishes a ground connection.
  • the entire measuring sensor system and the derivatives are in accordance with the dielectric Dimensioned or arranged requirements and in the synthetic resin of the Post insulator 2 cast.
  • the current transformer 1 is thus an integral body, which is almost identical in shape to a conventional post insulator without measuring function is trained.
  • the busbar in the head 21 of the post insulator 3 the ring 4, the magnetic field sensor 5 and its connecting lines 6 are arranged, i.e. there are no further metallic elements in the head 21 which the Function of the current transformer 1 could impair.
  • the current transformer 1 is connected to a line network involved, d. H. current-carrying rails are connected to the current rail 3 e.g. connected by screw connection.
  • the current led over the busbar 3 causes a magnetic field proportional to the current flow, which is bundled by the ring 4 becomes.
  • the ring 4 directs this magnetic field to the magnetic field sensor located in the gap 5, which is proportional to the magnetic field and thus also to the current Output signal delivers. This becomes via the connecting lines 6 to the connection base 24 removed and can be tapped there and fed to a relay or the like become.
  • the conductor rail 3 with a rectangular cross section is in this embodiment provided in the area of the head 21 with rounded edges so that corona or corona discharges can be avoided.
  • the partial discharge onset voltage becomes thereby significantly reduced.
  • the rounded Edges of the busbar 3 produced by a post-processing step. It is also possible to use a busbar with a round cross-section, which, however, usually has a lower tensile strength than the one according to the invention Flat metal made busbar 3 has.
  • the busbar Depressions or through openings can be formed, which flow in or through the casting resin during the pressing process in the course of the manufacture of the post insulator 2 enable.
  • an additional after hardening of the casting resin Fixation of the busbar achieved. So there is a one-sided load as well as any Current transformer 1 can be installed.
  • the Countered danger that the busbar pulled out of the head of the post insulator could be.
  • This type of position fixation or anchoring is also a always given the same position of the busbar relative to the magnetic field sensor, what leads to improved measurement accuracy.
  • the invention thus creates a current transformer 1 for measurement and protection purposes in High or medium voltage networks with busbars guided in post insulators, at which the busbar 3 in the region of the head 21 of the post insulator 2 at a distance of a ring 4 which is not closed is made of magnetically conductive material, which is arranged within the material of the post insulator 2, wherein in the gap between the open ends of the ring 4 of the magnetic field sensor 5 also within the material the support insulator 2 is arranged, and wherein the connecting lines 6 of the Magnetic field sensor 5 through the body 22 of the post insulator 2 to its base 23 managed and can be tapped there.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
EP02015110A 2001-07-12 2002-07-05 Transformateur de courant Pending EP1276121A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10134014 2001-07-12
DE10134014A DE10134014A1 (de) 2001-07-12 2001-07-12 Stromwandler

Publications (2)

Publication Number Publication Date
EP1276121A2 true EP1276121A2 (fr) 2003-01-15
EP1276121A3 EP1276121A3 (fr) 2003-05-28

Family

ID=7691618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02015110A Pending EP1276121A3 (fr) 2001-07-12 2002-07-05 Transformateur de courant

Country Status (3)

Country Link
US (1) US20030011362A1 (fr)
EP (1) EP1276121A3 (fr)
DE (1) DE10134014A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2226816A1 (fr) * 2009-01-27 2010-09-08 Andreas Siemes Transformateur de courant et son procédé de fabrication pour la mesure et la protection dans des réseaux de haute et moyenne tension
DE102009043596A1 (de) * 2009-09-25 2011-03-31 Siemens Aktiengesellschaft Messwandler mit einem elektrischen Wandler
CN104166074A (zh) * 2014-08-07 2014-11-26 上海萌烨电力科技有限公司 输电线路电流数据采集装置
CN107154307A (zh) * 2017-07-06 2017-09-12 正泰电气股份有限公司 一种电流互感器用保护罩
WO2021058089A1 (fr) * 2019-09-24 2021-04-01 Siemens Energy Global GmbH & Co. KG Émission de signaux dans des transformateurs de mesure

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080061915A1 (en) * 2006-09-11 2008-03-13 Rodney Godbey Dry-type transformer with shielded core/coil assembly and method of manufacturing the same
DE102007051579A1 (de) 2007-10-29 2009-05-20 Andreas Siemes Stromwandler für die Messung und den Schutz in Hoch- oder Mittelspannungsnetzen
US7876086B2 (en) * 2008-02-28 2011-01-25 International Components Corporation Current measuring device for measuring the electrical current flowing in an electrical conductor electrically isolated from the current measuring device
KR100875518B1 (ko) 2008-05-14 2008-12-22 경동중전기(주) 개로형 변류기가 내장된 지지애자
US20100321003A1 (en) * 2009-06-23 2010-12-23 Franklin Christiaan Geiger Meter-mounted extender
EP2768396A2 (fr) 2011-10-17 2014-08-27 Butterfly Network Inc. Imagerie transmissive et appareils et procédés associés
WO2013170053A1 (fr) 2012-05-09 2013-11-14 The Regents Of The University Of Michigan Transducteur linéaire à entraînement magnétique pour imagerie ultrasonore
US9667889B2 (en) 2013-04-03 2017-05-30 Butterfly Network, Inc. Portable electronic devices with integrated imaging capabilities

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB833790A (en) * 1956-06-04 1960-04-27 Ite Circuit Breaker Ltd Current transformer
US3793166A (en) * 1970-01-07 1974-02-19 American Smelting Refining Electrical current measurement and rapidly locating and positively identifying cathodes having abnormal electrical conditions associated therewith in an electrolytic copper refining process tankhouse
US4808910A (en) * 1985-03-14 1989-02-28 Sprecher & Schuh Ag High voltage measurement transformer for suspension from a high voltage switching apparatus
US6252389B1 (en) * 1998-03-18 2001-06-26 Mitsubishi Denki Kabushiki Kaisha Current detector having magnetic core for concentrating a magnetic flux near a hall-effect sensor, and power switch apparatus incorporating same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3199026A (en) * 1961-05-01 1965-08-03 Gen Precision Inc D.-c. clamp-on meter including a hall plate flux detector
GB1464047A (en) * 1973-12-07 1977-02-09 Meidensha Electric Mfg Co Ltd Instrument transformer
GB2099159B (en) * 1981-05-22 1985-04-11 Heme International Ltd Measuring probe
GB8603781D0 (en) * 1986-02-15 1986-03-19 Pilkington Brothers Plc Current probe
US4935693A (en) * 1987-10-14 1990-06-19 Square D Company Line secured current and voltage sensing apparatus
CH674089A5 (fr) * 1987-10-16 1990-04-30 Lem Liaisons Electron Mec
JPH03206971A (ja) * 1990-01-09 1991-09-10 Mitsubishi Electric Corp 光変成器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB833790A (en) * 1956-06-04 1960-04-27 Ite Circuit Breaker Ltd Current transformer
US3793166A (en) * 1970-01-07 1974-02-19 American Smelting Refining Electrical current measurement and rapidly locating and positively identifying cathodes having abnormal electrical conditions associated therewith in an electrolytic copper refining process tankhouse
US4808910A (en) * 1985-03-14 1989-02-28 Sprecher & Schuh Ag High voltage measurement transformer for suspension from a high voltage switching apparatus
US6252389B1 (en) * 1998-03-18 2001-06-26 Mitsubishi Denki Kabushiki Kaisha Current detector having magnetic core for concentrating a magnetic flux near a hall-effect sensor, and power switch apparatus incorporating same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2226816A1 (fr) * 2009-01-27 2010-09-08 Andreas Siemes Transformateur de courant et son procédé de fabrication pour la mesure et la protection dans des réseaux de haute et moyenne tension
DE102009043596A1 (de) * 2009-09-25 2011-03-31 Siemens Aktiengesellschaft Messwandler mit einem elektrischen Wandler
CN104166074A (zh) * 2014-08-07 2014-11-26 上海萌烨电力科技有限公司 输电线路电流数据采集装置
CN104166074B (zh) * 2014-08-07 2017-04-12 上海萌烨电力科技有限公司 输电线路电流数据采集装置
CN107154307A (zh) * 2017-07-06 2017-09-12 正泰电气股份有限公司 一种电流互感器用保护罩
CN107154307B (zh) * 2017-07-06 2019-06-11 正泰电气股份有限公司 一种电流互感器用保护罩
WO2021058089A1 (fr) * 2019-09-24 2021-04-01 Siemens Energy Global GmbH & Co. KG Émission de signaux dans des transformateurs de mesure

Also Published As

Publication number Publication date
EP1276121A3 (fr) 2003-05-28
US20030011362A1 (en) 2003-01-16
DE10134014A1 (de) 2003-01-30

Similar Documents

Publication Publication Date Title
DE2363933C3 (de) Kombinierte Strom- und Spannungsmeßeinrichtung
EP1276121A2 (fr) Transformateur de courant
DE3329748A1 (de) Stuetzisolator fuer hochspannung
DE19712900A1 (de) Sensoranordnung zur Strom- und Spannungsmessung
DE69908138T2 (de) Schalterpol mit integriertem optischen stromsensor
DE102016225879A1 (de) Allstromsensitiver Summenstromwandler, elektromechanisches Schutzschaltgerät und Herstellverfahren
DE19755887A1 (de) Spannungswandlereinrichtung für Mittel- bzw. Hochspannungs-Leistungsschalteranlagen
EP1249910A2 (fr) Disjoncteur haute-tension pour une installation de commutation à isolation gaseuse
DE3742610C1 (en) Coupling capacitor for a voltage measuring and/or display device
EP3001204A1 (fr) Traversée pour au moins un conducteur électrique à travers une ouverture
EP3987298B1 (fr) Mesure d'une tension électrique sur un appareillage de commutation à enveloppe métallique
DE102016207292B4 (de) Elektrische Schutzvorrichtung und Transformator mit einer solchen
EP3373313A1 (fr) Transformateur de courant résistant à l'éclatement, en particulier pour automotrice
EP0494151B1 (fr) Interrupteur de mise a la terre pour installation electrique a haute tension isolee a gaz comprime et a blindage metallique
DE19856775A1 (de) Hochspannungsleistungsschalter mit einer Unterbrechereinheit
DE19958782B4 (de) Durchführungsstützer und -stromwandler für metallgekapselte, luftisolierte Mittelspannungs-Schaltanlagen
DE9217807U1 (de) Ringkernstromwandler
DE3521518A1 (de) Hochspannungsstromwandler
DE10258115A1 (de) Breitbandiges Messmodul zur Strommessung an Einrichtungen der Leistungselektronik
EP3400603B1 (fr) Ensemble enroulement muni d'une traversée de type enfichable
AT521644B1 (de) Vorrichtung zur Messung von Stromstärke und Spannung
EP3276647B1 (fr) Unité de mise à la terre pour une installation de commutation
AT399601B (de) Stromwandler für einen hochspannungsleiter
WO1995024723A1 (fr) Transformateur de courant
DE3410726A1 (de) Einphasiges metallgekapseltes wechselstromsystem

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

RIC1 Information provided on ipc code assigned before grant

Ipc: 7G 01R 15/20 B

Ipc: 7H 01F 38/30 A

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20030829

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR