EP0076999A2 - Arrangement for the avoidance of fault impulses of a summation current transformer - Google Patents

Arrangement for the avoidance of fault impulses of a summation current transformer Download PDF

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Publication number
EP0076999A2
EP0076999A2 EP82109160A EP82109160A EP0076999A2 EP 0076999 A2 EP0076999 A2 EP 0076999A2 EP 82109160 A EP82109160 A EP 82109160A EP 82109160 A EP82109160 A EP 82109160A EP 0076999 A2 EP0076999 A2 EP 0076999A2
Authority
EP
European Patent Office
Prior art keywords
arrangement
current transformer
summation current
avoidance
fault
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.)
Withdrawn
Application number
EP82109160A
Other languages
German (de)
French (fr)
Other versions
EP0076999A3 (en
Inventor
Otto jun Müller
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.)
Siemens AG
Original Assignee
Siemens AG
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 AG filed Critical Siemens AG
Publication of EP0076999A2 publication Critical patent/EP0076999A2/en
Publication of EP0076999A3 publication Critical patent/EP0076999A3/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • H01H2083/146—Provisions for avoiding disadvantages of having asymetrical primaries, e.g. induction of a magnetic field even by zero difference current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • H01H2083/148—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection with differential transformer with primary windings formed of rigid copper conductors

Definitions

  • the invention relates to an arrangement for avoiding false pulses of a summation current transformer on its secondary winding in fault current circuit breakers by means of shields in the interior of the transformer core.
  • Residual current circuit breakers use summation current transformers that have to detect a relatively small difference between two large nominal currents. In many cases, a secondary number of turns in the total current transformer of a few turns is sufficient for this. It is therefore generally not possible to distribute the secondary winding evenly over the entire circumference of the toroid for the summation current transformer.
  • the primary conductors are generally not held in any particular place in the ring opening of the converter, an assignment of the primary conductor and the primary winding to the secondary winding, which consists only of individual turns, can be freely selected. It thus happens in practice that stray fields of the primary windings, the total current of which is zero, are partially chained to the secondary winding of the converter.
  • the invention is therefore based on the object of providing an arrangement with which the faulty shutdowns, in particular at very high currents, can be avoided even more reliably, without having to make a considerable effort.
  • This is achieved in a simple manner in an arrangement of the type mentioned above in that at least one conductor concentrically engages around the other in the region of the converter core.
  • the hollow cylindrical conductor parts are provided with tapering connection projections running in the longitudinal direction.
  • the hollow cylindrical conductor parts are advantageously made of copper.
  • the hollow cylindrical conductor parts can be cast, for example, inside the ring core and the extensions can be provided with screw connections, so that a three-wire cable can be connected without difficulty.
  • the current-carrying primary conductors 3, 4 and 5 are passed through the opening 1 of the annular converter core 2 and the secondary winding 6 is wound through.
  • the primary conductor 5 can be designed as a normal round conductor, whereas the other primary conductors 3 and 4 are arranged concentrically to the primary conductor 5 as hollow cylindrical conductor parts.
  • Longitudinal, tapered connection extensions 7 serve to connect the actual cables, which can be done in the usual way via screw connections. After insertion of the hollow cylindrical conductor parts and the primary conductor 5, these can be cast in the converter core 2 in the usual way, so that additional mounting measures can be omitted.

Abstract

The invention relates to an arrangement for the avoidance of fault impulses of a summation current transformer on its secondary winding (6). In such an arrangement, especially for fault-current protection switches, one lead (3, 4) surrounds the other (5) concentrically, in the region of the transformer core (2). By means of this arrangement, faulty disconnections are avoided, especially in the case of very high currents. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Anordnung zur Vermeidung von Fehlimpulsen eines Summenstromwandlers auf seine Sekundärwicklung bei Fehlerstrom-Schutzschaltern mittels Abschirmungen im Innern des Wandlerkernes.The invention relates to an arrangement for avoiding false pulses of a summation current transformer on its secondary winding in fault current circuit breakers by means of shields in the interior of the transformer core.

Bei Fehlerstrom-Schutzschaltern werden Summenstromwandler benutzt, die eine relativ kleine Differenz zweier großer Nennströme zu erfassen haben. Hierzu reicht in vielen Fällen eine Sekundärwindungszahl im Summenstromwandler von wenigen Windungen aus. Es ist somit im allgemeinen nicht möglich, die Sekundärwicklung gleichmäßig über den gesamten Umfang des Ringkernes für den Summenstromwandler zu verteilen. Da jedoch die Primärleiter im allgemeinen in der Ringöffnung des Wandlers in keiner bestimmten Stelle festgehalten werden, ist also eine Zuordnung des Primärleiters und der Primärwicklung zur Sekundärwicklung, die nur aus einzelnen Windungen besteht, frei wählbar. Es kommt somit in der Praxis vor, daß Streufelder der Primärwicklungen, deren Summenstrom an sich Null ist, mit der Sekundärwicklung des Wandlers teilweise verkettet sind. Dies kann nun einen Fehlimpuls bzw. eine Auslösung des Fehlerstrom-Schutzschalters bedeuten, obwohl kein Fehlerstrom auf der Primärseite des Wandlers vorliegt. Auch treten bei sehr hohen Strömen, z.B. dem Einschaltrush von Transformatoren oder Motoren als einzigem Verbraucher hinter dem Wandler, unkontrollierbare Streufelder auf, die ebenfalls Fehlabschaltungen verursachen. Zur Eingrenzung derartiger Probleme ist eine Anordnung der obengenannten Art bekannt, bei der zwischen Primärwicklung und Sekundärwicklung des Summenstromwandlers eine dünnwandige, magnetisch leitende Abschirmung vorgesehen ist. Diese Anordnung hat zwar eine wesentliche Verbesserung der Fehlabschaltungen mit sich gebracht; sie konnten jedoch im Hinblick auf die asymmetrische Anordnung der Leiter innerhalb des Summenstromwandlers noch nicht sicher genug vermeiden werden.Residual current circuit breakers use summation current transformers that have to detect a relatively small difference between two large nominal currents. In many cases, a secondary number of turns in the total current transformer of a few turns is sufficient for this. It is therefore generally not possible to distribute the secondary winding evenly over the entire circumference of the toroid for the summation current transformer. However, since the primary conductors are generally not held in any particular place in the ring opening of the converter, an assignment of the primary conductor and the primary winding to the secondary winding, which consists only of individual turns, can be freely selected. It thus happens in practice that stray fields of the primary windings, the total current of which is zero, are partially chained to the secondary winding of the converter. This can mean a fault pulse or a triggering of the residual current circuit breaker, although there is no fault current on the primary side of the converter. Even at very high currents, such as the switch-on rush of transformers or motors as the only consumer behind the converter, there are uncontrollable stray fields that also cause faulty shutdowns. To narrow down such problems is one Arrangement of the type mentioned above is known, in which a thin-walled, magnetically conductive shield is provided between the primary winding and the secondary winding of the summation current transformer. Although this arrangement has brought about a substantial improvement in faulty shutdowns; however, with regard to the asymmetrical arrangement of the conductors within the summation current transformer, they could not yet be avoided safely enough.

Der Erfindung liegt somit die Aufgabe zugrunde, eine Anordnung zu schaffen, mit der die Fehlabschaltungen, insbesondere bei sehr hohen Strömen, noch sicherer vermieden werden können, ohne hierbei einen erheblichen Aufwand treiben zu müssen. Dies wird auf einfache Weise bei einer Anordnung der obengenannten Art dadurch erreicht, daß zumindest ein Leiter den anderen im Bereich des Wandlerkerns konzentrisch umgreift. Um auf besondere Anschlußmittel bei den konzentrischen Leitern verzichten zu können, ist es vorteilhaft, wenn die hohlzylinderförmigen Leiterteile mit in Längsrichtung verlaufenden, sich verjüngenden Anschlußfortsätzen versehen sind. Die hohlzylindrischen Leiterteile werden vorteilhafterweise aus'Kupfer hergestellt. Die hohlzylinderförmigen Leiterteile können beispielsweise innerhalb des Ringkernes eingegossen werden und die Fortsätze mit Schraubanschlüssen versehen werden, so daß ohne Schwierigkeiten ein Dreileiterkabel angeschlossen werden kann.The invention is therefore based on the object of providing an arrangement with which the faulty shutdowns, in particular at very high currents, can be avoided even more reliably, without having to make a considerable effort. This is achieved in a simple manner in an arrangement of the type mentioned above in that at least one conductor concentrically engages around the other in the region of the converter core. In order to be able to dispense with special connection means for the concentric conductors, it is advantageous if the hollow cylindrical conductor parts are provided with tapering connection projections running in the longitudinal direction. The hollow cylindrical conductor parts are advantageously made of copper. The hollow cylindrical conductor parts can be cast, for example, inside the ring core and the extensions can be provided with screw connections, so that a three-wire cable can be connected without difficulty.

Anhand der Zeichnung wird ein Ausführungsbeispiel gemäß der Erfindung beschrieben.An exemplary embodiment according to the invention is described with reference to the drawing.

Es zeigen:

  • Fig. 1 eine Schnittdarstellung durch die erfindungsgemäße Anordnung und
  • Fig. 2 eine Seitenansicht.
Show it:
  • Fig. 1 is a sectional view through the arrangement according to the invention and
  • Fig. 2 is a side view.

Durch die Öffnung 1 des ringförmigen Wandlerkerns 2 sind die stromdurchflossenen Primärleiter 3, 4 und 5 hindurchgeführt sowie die Sekundärwicklung 6 hindurchgewickelt. Der Primärleiter 5 kann als normaler Rundleiter ausgebildet sein, wohingegen die übrigen Primärleiter 3 und 4 konzentrisch zum Primärleiter 5 als hohlzylinderförmige Leiterteile angeordnet sind. In Längsrichtung verlaufende, sich verjüngende Anschlußfortsätze 7 dienen dem Anschluß der eigentlichen Kabel, was in üblicher Weise über Schraubanschlüsse erfolgen kann. Nach Einsetzen der hohlzylinderförmigen Leiterteile und des Primärleiters 5 können diese im Wandlerkern 2 in üblicher Weise eingegossen werden, so daß zusätzliche Halterungsmaßnahmen entfallen können.The current-carrying primary conductors 3, 4 and 5 are passed through the opening 1 of the annular converter core 2 and the secondary winding 6 is wound through. The primary conductor 5 can be designed as a normal round conductor, whereas the other primary conductors 3 and 4 are arranged concentrically to the primary conductor 5 as hollow cylindrical conductor parts. Longitudinal, tapered connection extensions 7 serve to connect the actual cables, which can be done in the usual way via screw connections. After insertion of the hollow cylindrical conductor parts and the primary conductor 5, these can be cast in the converter core 2 in the usual way, so that additional mounting measures can be omitted.

Claims (2)

1. Anordnung zur Vermeidung von Fehlimpulsen eines Summenstromwandlers auf seine Sekundärwicklung bei Fehlerstrom-Schutzschaltern mittels Abschirmungen im Innern des Wandlerkernes, dadurch gekennzeichnet , daß zumindest ein Leiter (3,4) den anderen (5) im Bereich des Wandlerkerns (2) konzentrisch umgreift.1. Arrangement for avoiding false pulses of a summation current transformer on its secondary winding in residual current circuit breakers by means of shields in the interior of the transformer core, characterized in that at least one conductor (3, 4) concentrically surrounds the other (5) in the region of the transformer core (2). 2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß die hohlzylinderförmigen Leiterteile (3,4) mit in Längsrichtung verlaufenden, sich verjüngenden Anschlußfortsätzen (7) versehen sind.2. Arrangement according to claim 1, characterized in that the hollow cylindrical conductor parts (3, 4) are provided with tapering connecting extensions (7) running in the longitudinal direction.
EP82109160A 1981-10-14 1982-10-04 Arrangement for the avoidance of fault impulses of a summation current transformer Withdrawn EP0076999A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3140866 1981-10-14
DE19813140866 DE3140866A1 (en) 1981-10-14 1981-10-14 ARRANGEMENT FOR PREVENTING MISTAKE PULSES OF A TOTAL CURRENT TRANSFORMER

Publications (2)

Publication Number Publication Date
EP0076999A2 true EP0076999A2 (en) 1983-04-20
EP0076999A3 EP0076999A3 (en) 1985-10-16

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Family Applications (1)

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EP82109160A Withdrawn EP0076999A3 (en) 1981-10-14 1982-10-04 Arrangement for the avoidance of fault impulses of a summation current transformer

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EP (1) EP0076999A3 (en)
DE (1) DE3140866A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003760A1 (en) * 1994-07-23 1996-02-08 Delta Circuit Protection & Controls Limited Current imbalance sensor
US5841616A (en) * 1994-07-23 1998-11-24 Delta Circuit Protection & Controls Limited Module for use with a miniature circuit breaker
FR2909800A1 (en) * 2006-12-12 2008-06-13 Schneider Electric Ind Sas Differential current detecting toroid for switchgear, has magnetic band, whose end part has unit homogenizing magnetic flux to gradually reduce magnetic coupling between end part and turn towards ends of band
EP3441999A1 (en) * 2017-08-09 2019-02-13 Schneider Electric USA Inc. Integrated arc fault and ground fault current sensing package
EP3442000A1 (en) * 2017-08-09 2019-02-13 Schneider Electric USA, Inc. Differential current sensing bussing method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4410076A1 (en) * 1994-03-23 1995-09-28 Valentron Ag Residual current circuit breaker
DE19653552C2 (en) * 1996-12-20 2000-07-13 Siemens Ag Total current converter arrangement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB719219A (en) * 1951-04-14 1954-12-01 Anderson Boyes & Co Ltd Improvements in or relating to polyphase current transformers for use in earth leakage protective systems
US3665356A (en) * 1969-04-23 1972-05-23 Rucker Co Differential transformer with balancing means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB719219A (en) * 1951-04-14 1954-12-01 Anderson Boyes & Co Ltd Improvements in or relating to polyphase current transformers for use in earth leakage protective systems
US3665356A (en) * 1969-04-23 1972-05-23 Rucker Co Differential transformer with balancing means

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003760A1 (en) * 1994-07-23 1996-02-08 Delta Circuit Protection & Controls Limited Current imbalance sensor
US5841616A (en) * 1994-07-23 1998-11-24 Delta Circuit Protection & Controls Limited Module for use with a miniature circuit breaker
FR2909800A1 (en) * 2006-12-12 2008-06-13 Schneider Electric Ind Sas Differential current detecting toroid for switchgear, has magnetic band, whose end part has unit homogenizing magnetic flux to gradually reduce magnetic coupling between end part and turn towards ends of band
EP1933342A1 (en) * 2006-12-12 2008-06-18 Schneider Electric Industries S.A.S. Toroid and differential detection device
EP3441999A1 (en) * 2017-08-09 2019-02-13 Schneider Electric USA Inc. Integrated arc fault and ground fault current sensing package
EP3442000A1 (en) * 2017-08-09 2019-02-13 Schneider Electric USA, Inc. Differential current sensing bussing method
CN109390907A (en) * 2017-08-09 2019-02-26 施耐德电气美国股份有限公司 Differential current sense bus method
US10622800B2 (en) 2017-08-09 2020-04-14 Schneider Electric USA, Inc. Integrated arc fault and ground fault current sensing package
CN109390907B (en) * 2017-08-09 2020-06-12 施耐德电气美国股份有限公司 Differential current sensing bus method
US10852326B2 (en) 2017-08-09 2020-12-01 Schneider Electric USA, Inc. Differential current sensing bussing method
RU2769969C2 (en) * 2017-08-09 2022-04-12 ШНЕЙДЕР ЭЛЕКТРИК ЮЭсЭй, ИНК. Method for wiring bus connections for differential current detection
US11385300B2 (en) 2017-08-09 2022-07-12 Schneider Electric USA, Inc. Differential current sensing bussing method

Also Published As

Publication number Publication date
EP0076999A3 (en) 1985-10-16
DE3140866A1 (en) 1983-04-21

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