EP0558428B1 - Toroidal transformer for class A differential sensor - Google Patents

Toroidal transformer for class A differential sensor Download PDF

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Publication number
EP0558428B1
EP0558428B1 EP19930420079 EP93420079A EP0558428B1 EP 0558428 B1 EP0558428 B1 EP 0558428B1 EP 19930420079 EP19930420079 EP 19930420079 EP 93420079 A EP93420079 A EP 93420079A EP 0558428 B1 EP0558428 B1 EP 0558428B1
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EP
European Patent Office
Prior art keywords
winding
primary
insulating case
transformer
class
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
EP19930420079
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German (de)
French (fr)
Other versions
EP0558428A1 (en
Inventor
Michel Merlin Gerin Vieux
Claude Merlin Gerin Vivarat-Martin
Jean-Louis Merlin Gerin Ducroquet
Elhoussaine Merlin Gerin Elfarissi
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Schneider Electric SE
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Schneider Electric SE
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Publication date
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Publication of EP0558428A1 publication Critical patent/EP0558428A1/en
Application granted granted Critical
Publication of EP0558428B1 publication Critical patent/EP0558428B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/16—Toroidal transformers
    • 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
    • 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 present invention relates to a toroidal transformer for a differential sensor operating in Class A, that is to say a differential sensor sensitive to rectified currents or to continuous components.
  • this transformer comprises the primary wire winding, which generally comprises the phase wire or wires and the neutral wire of the electrical power supply line, and which passes through the central orifice of the first annular casing.
  • the primary wire winding passes either directly into this central orifice without creating turns, or on the contrary passes through it by making one or more turns around the second insulating housing.
  • the secondary winding is the seat of an induced voltage which allows this fault to be recognized.
  • the secondary winding, and the second insulating box are distributed over an angular sector of the order of 180 degrees.
  • transformer 1 in the form of a torus for differential sensor operating in Class A, such a transformer being more simply called “Class A torus" in professional language.
  • a magnetic core 4 visible in FIGS. 3 and 4, in the form of an annular torus with rectangular section, this magnetic core 4 being enveloped by a first insulating protective casing 5, of a shape corresponding to that of the core 4, which is composed of two nested half-shells, 5A and 5B.
  • the secondary winding 6 consists of a winding with a large number of turns which, according to the invention, is distributed only over an angular sector A of the order of a semicircle. In the case shown, this angular sector A extends over a little more than 180 degrees.
  • the secondary winding 6 has rectangular turns, wound on the first box 5, but this winding is only carried out on the first angular sector A.
  • the primary windings 2 and 3 comprising in this example a turn SP of the phase wire and a turn SN of the neutral wire, can then be wound on the second portion 5S thus remaining visible from the first insulating unit 5, which provides a significant gain in space for this transformer.
  • the two turns, SP and SN, of the phase wire and the neutral wire are wound around the portion remained free 5S of the housing 5 so as to bear against the edge 8 of the second housing 7, which makes it possible to maintain the latter in position and to reinforce the solidity of the assembly.
  • the angle A could be much greater than 180 degrees instead of being close to it, provided that it leaves free a sector 5S sufficient to allow the winding of the primary turns, such as the turns SP and SN shown, around the portion that remains visible from the first insulating box 5.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Transformers For Measuring Instruments (AREA)

Description

La présente invention se rapporte à un transformateur en forme de tore pour capteur différentiel fonctionnant en Classe A, c'est-à-dire un capteur différentiel sensible à des courants redressés ou à des composantes continues.The present invention relates to a toroidal transformer for a differential sensor operating in Class A, that is to say a differential sensor sensitive to rectified currents or to continuous components.

Un tore pour capteur différentiel de Classe A est un transformateur conçu spécialement pour, contrairement aux transformateurs les plus courants, être sensible aux composantes continues ou aux courants redressés. Un tel transformateur est classiquement composé, successivement de l'intérieur vers l'extérieur :

  • . d'un noyau magnétique en forme de tore annulaire;
  • . d'un premier boitier isolant, de forme annulaire, qui entoure, et donc protège contre les chocs, ce noyau magnétique;
  • . d'un bobinage fil secondaire uniformément réparti sur 360 degrés et enroulé autour de ce premier boitier isolant; et
  • . d'un deuxième boitier isolant de forme annulaire, en deux demi-coquilles, qui entoure totalement ce bobinage fil secondaire et sert donc d'enveloppe, ou coquille, annulaire de protection pour l'ensemble.
A toroid for Class A differential sensor is a transformer specially designed to, unlike the most common transformers, be sensitive to direct components or rectified currents. Such a transformer is conventionally composed, successively from the inside to the outside:
  • . a magnetic core in the form of an annular torus;
  • . a first insulating housing, of annular shape, which surrounds, and therefore protects against impact, this magnetic core;
  • . a secondary wire winding uniformly distributed over 360 degrees and wound around this first insulating box; and
  • . a second annular insulating case, in two half-shells, which completely surrounds this secondary wire winding and therefore serves as an envelope, or shell, annular protection for the assembly.

Enfin, ce transformateur comporte le bobinage fil primaire, qui comprend généralement le ou les fils de phase et le fil de neutre de la ligne d'alimentation en énergie électrique, et qui passe dans l'orifice central du premier boitier annulaire. Selon le cas, le bobinage fil primaire passe soit directement dans cet orifice central sans création de spires, soit passe au contraire à travers celui-ci en effectuant un ou plusieurs tours autour du deuxième boitier isolant.Finally, this transformer comprises the primary wire winding, which generally comprises the phase wire or wires and the neutral wire of the electrical power supply line, and which passes through the central orifice of the first annular casing. Depending on the case, the primary wire winding passes either directly into this central orifice without creating turns, or on the contrary passes through it by making one or more turns around the second insulating housing.

En cas de fuite à la terre soit d'un fil de phase, soit du fil de neutre, l'enroulement secondaire est le siège d'une tension induite qui permet de reconnaître ce défaut.In the event of an earth leakage either of a phase wire or of the neutral wire, the secondary winding is the seat of an induced voltage which allows this fault to be recognized.

Cette nécessité d'enrouler le bobinage primaire autour du deuxième boitier entraine un encombrement relativement important pour ce transformateur, ce qui pénalise le capteur différentiel pour certaines implantations, et en particulier offre souvent peu de latitude pour monter en calibre.This need to wind the primary winding around the second box causes a relatively large size for this transformer, which penalizes the differential sensor for certain locations, and in particular often offers little leeway to increase in size.

L'invention vise à remédier à cet inconvénient. Elle se rapporte à un transformateur en forme de tore pour capteur différentiel fonctionnant en Classe A, ce transformateur comportant d'une part un noyau magnétique annulaire qui est entouré d'un premier boitier isolant de forme annulaire servant de passage pour l'enroulement primaire par exemple constitué par au moins une spire d'au moins un fil de phase et/ou du fil de neutre d'une ligne d'alimentation en énergie électrique, et comportant d'autre part un enroulement secondaire qui est bobiné autour de ce premier boitier isolant et qui est lui-même protégé par un second boitier isolant qui l'entoure. Conformément à l'invention, et afin de permettre une réduction de l'encombrement total de ce transformateur :

  • . l'enroulement secondaire est réparti sur un secteur angulaire inférieur à 360°, et en tous cas suffisant pour laisser, dans le secteur restant ainsi non bobiné, la place pour l'enroulement primaire;
  • . le second boitier isolant est réalisé en forme de secteur angulaire correspondant à celui de cet enroulement secondaire; et
  • . l'enroulement primaire est alors bobiné autour du premier boitier isolant et dans le secteur laissé libre par le second boitier isolant.
The invention aims to remedy this drawback. It relates to a transformer in the form of a torus for differential sensor operating in Class A, this transformer comprising on the one hand an annular magnetic core which is surrounded by a first insulating housing of annular shape serving as a passage for the primary winding by example consisting of at least one turn of at least one phase wire and / or neutral wire of an electric power supply line, and comprising on the other hand a secondary winding which is wound around this first box insulator and which is itself protected by a second insulating case which surrounds it. In accordance with the invention, and in order to allow a reduction in the total size of this transformer:
  • . the secondary winding is distributed over an angular sector less than 360 °, and in any case sufficient to leave, in the remaining sector thus unwound, the place for the primary winding;
  • . the second insulating box is produced in the form of an angular sector corresponding to that of this secondary winding; and
  • . the primary winding is then wound around the first insulating box and in the sector left free by the second insulating box.

Selon une forme avantageuse de réalisation, l'enroulement secondaire, et le second boitier isolant, sont répartis sur un secteur angulaire de l'ordre de 180 degrés.According to an advantageous embodiment, the secondary winding, and the second insulating box, are distributed over an angular sector of the order of 180 degrees.

De toute façon, l'invention sera bien comprise, et ses avantages et autres caractéristiques ressortiront, lors de la description suivante d'un exemple non limitatif de réalisation d'un transformateur torique pour capteur différentiel fonctionnant en Classe A, en référence au dessin schématique annexé dans lequel :

  • . Figure 1 est une vue d'ensemble en perspective de ce transformateur;
  • . Figure 2 en est une vue de côté;
  • . Figure 3 en est une vue en coupe selon III-III de Figure 2; et
  • . Figure 4 en est une vue en perspective éclatée.
In any case, the invention will be well understood, and its advantages and other characteristics will emerge during the following description of a nonlimiting example of an toroidal transformer for a differential sensor operating in Class A, with reference to the schematic drawing annexed in which:
  • . Figure 1 is an overall perspective view of this transformer;
  • . Figure 2 is a side view;
  • . Figure 3 is a sectional view along III-III of Figure 2; and
  • . Figure 4 is an exploded perspective view.

En se référant à l'ensemble des Figures, il s'agit d'un transformateur 1 en forme de tore pour capteur différentiel fonctionnant en Classe A, un tel transformateur étant plus simplement appelé "Tore Classe A" en langage de métier.Referring to all of the Figures, it is a transformer 1 in the form of a torus for differential sensor operating in Class A, such a transformer being more simply called "Class A torus" in professional language.

Dans cet exemple, il s'agit d'un capteur différentiel monophasé et le transformateur torique 1 est traversé par le fil de phase et par le fil de neutre constituant respectivement l'enroulement primaire de phase 2 et l'enroulement primaire de neutre 3.In this example, it is a single-phase differential sensor and the toroidal transformer 1 is crossed by the phase wire and by the neutral wire constituting respectively the primary phase winding 2 and the primary neutral winding 3.

Il comporte un noyau magnétique 4, visible sur les Figures 3 et 4, en forme de tore annulaire à section rectangulaire, ce noyau magnétique 4 étant enveloppé d'un premier boitier isolant de protection 5, de forme correspondante à celle du noyau 4, qui est composé de deux demi-coquilles emboitées, 5A et 5B.It comprises a magnetic core 4, visible in FIGS. 3 and 4, in the form of an annular torus with rectangular section, this magnetic core 4 being enveloped by a first insulating protective casing 5, of a shape corresponding to that of the core 4, which is composed of two nested half-shells, 5A and 5B.

L'enroulement secondaire 6 est constitué d'un bobinage à grand nombre de spires qui, conformément à l'invention, n'est réparti que sur un secteur angulaire A de l'ordre d'un demi-cercle . Dans le cas de figure représenté, ce secteur angulaire A s'étend sur un peu plus de 180 degrés.The secondary winding 6 consists of a winding with a large number of turns which, according to the invention, is distributed only over an angular sector A of the order of a semicircle. In the case shown, this angular sector A extends over a little more than 180 degrees.

Un second boitier 7 isolant, en forme de secteur de même angle A que l'enroulement secondaire 6, est prévu pour servir d'enveloppe protectrice pour cet enroulement 6. Il est constitué de deux demi-secteurs emboitables 7A et 7B et sa forme correspond à celle du bobinage 6.A second insulating box 7, in the form of a sector with the same angle A as the secondary winding 6, is provided to serve as a protective envelope for this winding 6. It is made up of two nestable half-sectors 7A and 7B and its shape corresponds to that of the winding 6.

L'enroulement secondaire 6 est à spires rectangulaires, bobiné sur le premier boitier 5, mais ce bobinage n'est réalisé que sur le premier secteur angulaire A.The secondary winding 6 has rectangular turns, wound on the first box 5, but this winding is only carried out on the first angular sector A.

Dans ces conditions, on constate que les enroulements primaires 2 et 3, comprenant dans cet exemple une spire SP du fil de phase et une spire SN du fil de neutre, peut alors être bobiné sur la deuxième portion 5S ainsi restée apparente du premier boitier isolant 5, ce qui procure un gain d'encombrement non négligeable pour ce transformateur.Under these conditions, it can be seen that the primary windings 2 and 3, comprising in this example a turn SP of the phase wire and a turn SN of the neutral wire, can then be wound on the second portion 5S thus remaining visible from the first insulating unit 5, which provides a significant gain in space for this transformer.

Préférentiellement, les deux spires, SP et SN, du fil de phase et du fil de neutre sont enroulées autour de la portion restée libre 5S du boitier 5 de manière à prendre appui contre la tranche 8 du deuxième boitier 7, ce qui permet de maintenir ce dernier en position et de renforcer la solidité de l'ensemble.Preferably, the two turns, SP and SN, of the phase wire and the neutral wire are wound around the portion remained free 5S of the housing 5 so as to bear against the edge 8 of the second housing 7, which makes it possible to maintain the latter in position and to reinforce the solidity of the assembly.

Comme il va de soi, l'invention n'est pas limitée à l'exemple de réalisation qui vient d'être décrit. C'est ainsi par exemple que l'angle A pourrait être nettement supérieur à 180 degrés au lieu d'en être voisin, pourvu qu'il laisse libre un secteur 5S suffisant pour permettre l'enroulement des spires primaires, telles que les spires SP et SN représentées, autour de la portion restée apparente du premier boitier isolant 5.It goes without saying that the invention is not limited to the embodiment which has just been described. Thus, for example, the angle A could be much greater than 180 degrees instead of being close to it, provided that it leaves free a sector 5S sufficient to allow the winding of the primary turns, such as the turns SP and SN shown, around the portion that remains visible from the first insulating box 5.

Claims (3)

  1. A transformer in the form of a toroid used in a differential sensor operating in Class A, and comprising :
    - an annular magnetic core (4) surrounded by a first annular insulating case (5) on which there is arranged a primary phase winding (2) and a primary neutral winding (3),
    - a secondary winding (6) wound around the first insulating case (5),
    - and a second insulating case (7) surrounding the secondary winding (6),
    characterized in that
    the secondary winding (6) is arranged on the first case (5) along a first angular sector (A) less than 360°, that the primary windings (2, 3) are wound around the first insulating case (5) along a complementary second sector (5S) left free, and that the second insulating case (7) is arranged as an angular sector of conjugate shape to the first sector (A).
  2. The transformer according to claim 1, characterized in that the first angular sector (A) of the secondary winding (6) extends over about 180 degrees.
  3. The transformer according to one of the claims 1 or 2, characterized in that the phase primary winding (2) and neutral primary winding (3) press against the end edges (8) of the second insulating case (7).
EP19930420079 1992-02-24 1993-02-19 Toroidal transformer for class A differential sensor Expired - Lifetime EP0558428B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9202200A FR2687831B1 (en) 1992-02-24 1992-02-24 TORQUE TRANSFORMER FOR A CLASS A DIFFERENTIAL SENSOR
FR9202200 1992-02-24

Publications (2)

Publication Number Publication Date
EP0558428A1 EP0558428A1 (en) 1993-09-01
EP0558428B1 true EP0558428B1 (en) 1996-09-04

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EP19930420079 Expired - Lifetime EP0558428B1 (en) 1992-02-24 1993-02-19 Toroidal transformer for class A differential sensor

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EP (1) EP0558428B1 (en)
DE (1) DE69304370T2 (en)
FR (1) FR2687831B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19534560C2 (en) * 1995-09-18 1999-09-02 Siemens Ag Toroidal current transformer
EP1884966A1 (en) * 2006-08-01 2008-02-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Insulator transformer
CN102013308A (en) * 2009-09-04 2011-04-13 奥斯兰姆有限公司 Electronic transformer
US10320358B2 (en) * 2017-02-14 2019-06-11 Hamilton Sundstrand Corporation Magnetically coupled contactless damper
DE102018106449A1 (en) * 2018-03-20 2019-09-26 Vacuumschmelze Gmbh & Co. Kg Magnetic assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2147816B1 (en) * 1971-07-30 1975-02-07 Landis & Gyr Ag
DE3220737A1 (en) * 1982-06-02 1983-12-08 Siemens AG, 1000 Berlin und 8000 München COLUMN-LOW RADIO EMISSION CONTROL
DE3307262A1 (en) * 1983-03-02 1984-09-06 Vogt Gmbh & Co Kg, 8391 Erlau Annular core suppression inductor with a directed scatter field

Also Published As

Publication number Publication date
FR2687831B1 (en) 1994-04-08
DE69304370T2 (en) 1997-02-20
FR2687831A1 (en) 1993-08-27
EP0558428A1 (en) 1993-09-01
DE69304370D1 (en) 1996-10-10

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