EP0509936B1 - Homopolarer Transformator mit gegen mechanischen Beanspruchungen unempfindlichem magnetischem Kreis, und Herstellungsverfahren - Google Patents

Homopolarer Transformator mit gegen mechanischen Beanspruchungen unempfindlichem magnetischem Kreis, und Herstellungsverfahren Download PDF

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Publication number
EP0509936B1
EP0509936B1 EP92420074A EP92420074A EP0509936B1 EP 0509936 B1 EP0509936 B1 EP 0509936B1 EP 92420074 A EP92420074 A EP 92420074A EP 92420074 A EP92420074 A EP 92420074A EP 0509936 B1 EP0509936 B1 EP 0509936B1
Authority
EP
European Patent Office
Prior art keywords
magnetic circuit
shells
base
enclosure
homopolar
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.)
Expired - Lifetime
Application number
EP92420074A
Other languages
English (en)
French (fr)
Other versions
EP0509936A2 (de
EP0509936A3 (en
Inventor
Jacques Vallot
Marc Paupert
Alain Germain
Claude Burnot
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 SE
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 EP0509936A2 publication Critical patent/EP0509936A2/de
Publication of EP0509936A3 publication Critical patent/EP0509936A3/fr
Application granted granted Critical
Publication of EP0509936B1 publication Critical patent/EP0509936B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 imbalance 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 imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/266—Fastening or mounting the core on casing or support
    • 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

  • the invention relates to a zero sequence transformer, in particular for a differential switch or circuit breaker, comprising a cylindrical magnetic circuit formed by the winding of a ferromagnetic strip having a high magnetic permeability, in particular an iron-nickel alloy and an envelope made of molded insulating material, constituted by the assembly of two conjugate half-shells delimiting an annular internal space for housing the magnetic circuit, one of the front faces of the cylindrical magnetic circuit being secured to the bottom of one of the half-shells by bonding means, the other faces of the magnetic circuit are separated from the envelope by functional clearances
  • the toroids used as totalizing current transformers in differential protection devices generally use alloys based on iron-nickel having very high magnetic permeabilities, in particular between 50,000 and 500,000. These materials are very sensitive to lateral mechanical stresses which can arise from a variation in pressure, shock or vibration. The effect can result in a decrease in the permeability of the material constituting the magnetic circuit, with a corresponding rise in the differential triggering threshold, to the detriment of the sensitivity of the differential protection device.
  • the opposite end faces of the cylindrical magnetic circuit 10 are protected by means of a pair of annular washers 12, 14 made of polyurethane foam.
  • These washers 12,14 are in abutment against the bottom of each half-shell 16,18 of the insulating casing 20, and are shaped as dampers between the magnetic circuit 10 and the casing 20.
  • the damping effect of washers 12,14 is exerted in the axial direction, and the casing 20 has a transverse functional clearance 21 arranged to prevent any transmission of mechanical stresses in the radial direction.
  • the positioning of the foam washers 12, 14 inside the half-shells 16, 18 is carried out manually before the insertion of the magnetic circuit 10.
  • An adhesive strip 22 is then bonded to the external interface of the half-shells. shells 16,18 butted together to close the envelope 20.
  • the mounting of such a zero sequence transformer is possible by manual. Automation of the assembly would require automatic distribution and positioning operations, which are difficult to achieve with the use of foam washers.
  • Document JP-A-3,019,307 describes a homopolar transformer with wound magnetic toroid fixed on the bottom of the envelope by means of a gel based on silicone rubber.
  • the gel overflows on the lateral sides of the torus, and after polymerization risks transmitting lateral mechanical stresses which affect the stability of the permeability of the ferromagnetic material.
  • Document JP-A-2,039,403 relates to the fixing of a magnetic core between two half-shells after interposition of an adhesive material on the opposite upper and lower faces.
  • the object of the invention consists in making a zero sequence transformer insensitive to mechanical stresses, and in manufacturing said transformer with an automatic mounting process.
  • the zero sequence transformer according to the invention is characterized in that the bonding means consist of three drops of glue arranged at 120 degrees on the annular bottom of the half-shell, so as to form an elastic suspension connection preventing any propagation of external shocks towards the magnetic circuit.
  • the elastic suspension of the magnetic circuit inside the internal space frees it from any mechanical stress due to shocks or vibrations from outside.
  • the permeability of the ferromagnetic material then remains invariable.
  • Figure 1 is a schematic sectional view of a zero sequence transformer according to the prior art, the primary and secondary windings not being shown.
  • Figure 2 is an identical view to Figure 1 of a transformer according to the invention.
  • the magnetic circuit 10 with a wound strip of iron-nickel alloy is secured by one 24 of its front faces on the bottom 26 inside the half-shell 18.
  • the fixing of the magnetic circuit 10 is made by gluing with three drops 28 of silicone glue deposited at 120 degrees on the annular base 26, prior to the installation of the magnetic circuit 10.
  • the upper front face 30 of the magnetic circuit 10 is separated from the bottom 32 of the half-shell 16 by an axial functional clearance 34.
  • the three drops 28 of silicone adhesive on the bottom 26 ensure an elastic suspension without constraint of the magnetic circuit 10 inside the annular internal space 36 of the envelope 20.
  • the assembly ends of the half-shells 16,18 comprise latching means 38 male and female, avoiding the use of adhesive tape at the end of the mounting of the zero sequence transformer.
  • silicone glue can be replaced by any other equivalent elastic fixing means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Coils Or Transformers For Communication (AREA)

Claims (3)

  1. Fehlerstromwandler, insbesondere für einen Fehlerstromschutzschalter oder Fehlerstromleistungsschalter, mit einem zylindrischen Magnetkreis (10) in Form einer Wicklung aus einem ferromagnetischen Band mit hoher magnetischer Permeabilität, insbesondere aus einer Eisen-Nickel-Legierung, und einem Isolierstoffgehäuse (20), das aus zwei zusammengesetzten, komplementär geformten und einen ringförmigen Innenraum (36) zur Aufnahme des Magnetkreises (10) bildenden Halbschalen (16, 18) besteht, wobei eine der Stirnseiten (24) des zylindrischen Magnetkreises (10) über Klebemittel (28) am Boden (26) einer der Halbschalen (18) befestigt ist und zwischen den übrigen Seiten des Magnetkreises (10) und dem Gehäuse (20) geeignete Zwischenräume (21, 34) ausgebildet sind, dadurch gekennzeichnet, daß die Klebemittel (28) aus drei um 120 Grad versetzt auf dem ringförmigen Boden (26) der Halbschale (18) aufgebrachten Tropfen eines Klebstoffs bestehen, so daß eine elastische Aufhängeverbindung entsteht, die jegliche Übertragung von äußeren Stößen auf den Magnetkreis (10) verhindert.
  2. Fehlerstromwandler nach Anspruch 1, dadurch gekennzeichnet, daß die Klebemittel (28) in Form eines Klebstoff auf Silikonbasis ausgeführt sind, der vor dem Einsetzen des Magnetkreises (10) auf dem Boden (26) der Halbschale (18) aufgebracht werden kann.
  3. Fehlerstromwandler nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Stoßflächen für den Zusammenbau der beiden Halbschalen (16, 18) positiv und negativ geformte Schnappmittel (38) aufweisen und daß das Gehäuse (20) nach dem Einsetzen des seitlich auf den Boden (26) aufgeklebten Magnetkreises (10) durch Ineinanderschnappen der beiden Halbschalen (16, 18) verschlossen werden kann.
EP92420074A 1991-03-27 1992-03-13 Homopolarer Transformator mit gegen mechanischen Beanspruchungen unempfindlichem magnetischem Kreis, und Herstellungsverfahren Expired - Lifetime EP0509936B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9103831A FR2674674B1 (fr) 1991-03-27 1991-03-27 Transformateur homopolaire a circuit magnetique insensible a des contraintes mecaniques, et procede de fabrication.
FR9103831 1991-03-27

Publications (3)

Publication Number Publication Date
EP0509936A2 EP0509936A2 (de) 1992-10-21
EP0509936A3 EP0509936A3 (en) 1993-05-19
EP0509936B1 true EP0509936B1 (de) 1995-08-30

Family

ID=9411259

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92420074A Expired - Lifetime EP0509936B1 (de) 1991-03-27 1992-03-13 Homopolarer Transformator mit gegen mechanischen Beanspruchungen unempfindlichem magnetischem Kreis, und Herstellungsverfahren

Country Status (4)

Country Link
EP (1) EP0509936B1 (de)
DE (1) DE69204346T2 (de)
ES (1) ES2079164T3 (de)
FR (1) FR2674674B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007034532A1 (de) 2007-07-24 2009-02-05 Vacuumschmelze Gmbh & Co. Kg Magnetkern, Verfahren zu seiner Herstellung sowie Fehlerstromschutzschalter

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9312004U1 (de) * 1993-08-11 1993-11-25 Siemens Matsushita Components Elektrisches Bauelement in Chip-Bauweise
JPH09246034A (ja) * 1996-03-07 1997-09-19 Alps Electric Co Ltd パルストランス磁心
DK0907190T3 (da) * 1997-09-29 2002-10-14 Epcos Ag Induktiv komponent og fremgangsmåde til fremstilling deraf
DE10134056B8 (de) 2001-07-13 2014-05-28 Vacuumschmelze Gmbh & Co. Kg Verfahren zur Herstellung von nanokristallinen Magnetkernen sowie Vorrichtung zur Durchführung des Verfahrens
KR101228497B1 (ko) * 2011-11-25 2013-01-31 주식회사 이랜텍 결합 강도가 개선된 트랜스포머
DE102012201002B4 (de) 2012-01-24 2022-10-06 Siemens Aktiengesellschaft Summenstromwandlergehäuse, Summenstromwandler und Fehlerstromschutzschalter
KR101966749B1 (ko) * 2015-12-11 2019-04-08 주식회사 아모그린텍 자기차폐형 변류기
CN105976992A (zh) * 2016-07-05 2016-09-28 佛山诺亚电器有限公司 高过载内保护配电变压器
DE102018106449A1 (de) * 2018-03-20 2019-09-26 Vacuumschmelze Gmbh & Co. Kg Magnetische Baugruppe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2523766A1 (fr) * 1982-03-22 1983-09-23 Merlin Gerin Dispositif de protection differentielle pour la detection d'un courant residuel alternatif et/ou continu sur deux voies distinctes
NL8401185A (nl) * 1984-04-13 1985-11-01 Philips Nv Transformator met coaxiale spoelkokers.
JPH0239403A (ja) * 1988-07-28 1990-02-08 Nagano Japan Radio Co 磁心の固定方法
JPH0266908A (ja) * 1988-08-31 1990-03-07 Nippon Ferrite Ltd 磁心
JPH0654738B2 (ja) * 1989-06-16 1994-07-20 日立フェライト株式会社 磁 心

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 14, No. 241 (E-931)(4148), 22 Mai 1990 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007034532A1 (de) 2007-07-24 2009-02-05 Vacuumschmelze Gmbh & Co. Kg Magnetkern, Verfahren zu seiner Herstellung sowie Fehlerstromschutzschalter
US8344830B2 (en) 2007-07-24 2013-01-01 Vaccumschmelze Gmbh & Co. Kg Magnet core; method for its production and residual current device

Also Published As

Publication number Publication date
FR2674674A1 (fr) 1992-10-02
FR2674674B1 (fr) 1993-10-22
DE69204346D1 (de) 1995-10-05
EP0509936A2 (de) 1992-10-21
DE69204346T2 (de) 1996-04-18
ES2079164T3 (es) 1996-01-01
EP0509936A3 (en) 1993-05-19

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