EP0828265B1 - Stromwandler und Schutzrelais mit einem solchen Wandler - Google Patents

Stromwandler und Schutzrelais mit einem solchen Wandler Download PDF

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Publication number
EP0828265B1
EP0828265B1 EP19970410098 EP97410098A EP0828265B1 EP 0828265 B1 EP0828265 B1 EP 0828265B1 EP 19970410098 EP19970410098 EP 19970410098 EP 97410098 A EP97410098 A EP 97410098A EP 0828265 B1 EP0828265 B1 EP 0828265B1
Authority
EP
European Patent Office
Prior art keywords
turns
output
transformer
winding
current transformer
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
EP19970410098
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English (en)
French (fr)
Other versions
EP0828265A1 (de
Inventor
Alain Dentella
Robert Tourre
Christian Petit
Pascal Odet
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
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Schneider Electric Industries SAS
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Publication date
Application filed by Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP0828265A1 publication Critical patent/EP0828265A1/de
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    • 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

Definitions

  • the invention relates to a current transformer comprising a magnetic circuit arranged on a primary power conductor and a secondary winding connected to two outputs and comprising a predetermined number of turns wound on the determining magnetic circuit a transformation report.
  • Current transformers used for protective relays, are generally installed on conductors of a power circuit to be protected. They provide circuits electronic devices for triggering low intensity secondary currents proportional to high primary currents. These secondary currents are used to measure the current, and, if the relays have their own current, to supply electrical circuits and said relays.
  • the protection relays must operate in very large current ranges.
  • the transformers current have a powerful magnetic circuit which provides a linear response from the secondary current.
  • certain current limiting devices include a resistor connected in series between a secondary winding of a current transformer and a relay input.
  • This high power resistor can be installed in the same box than the relay.
  • this arrangement can cause excessive heating of the electronic circuits of the relay when the box is of the closed type or without ventilation.
  • the limiting resistor can be arranged on an additional circuit external to the housing. This arrangement does not cause the electronic circuits to heat up but increases the cost of the protection relay.
  • Transformers described in patent applications JP 60 103607 and JP 07 235427 have windings wound in opposite directions to increase the resistance of winding.
  • the object of the invention is a current transformer avoiding the use of resistance limitation arranged on additional circuits while allowing said transformer to have at least two transformation reports, and a protection relay comprising such a transformer.
  • the value of the electrical resistance of the first and second parts of the secondary winding connected in series is greater than five ohms.
  • the first number of turns is greater than three hundred.
  • a first transformation ratio is determined between the first output and the second output by the difference between the first number of turns of the first part and the second number of turns of the second part
  • a second transformation ratio is determined between the first output and the third output by the difference between the sum of the first and third number of turns of the first and third parts and the second number of turns of the second part.
  • the first number of turns in the first part can be greater or less than the second number of turns in the second part.
  • the value of the resistance of the secondary winding is greater than eight ohms between the first output and the second output and greater than twelve ohms between the first exit and third exit.
  • a processing unit comprises at least two inputs connected by two electrical conductors at two outputs of the secondary winding.
  • the processing unit can be inserted in a closed box.
  • the known protection relay shown in Figure 1 includes a transformer current 1 crossed by a primary conductor 2, a resistor 3 and a processing unit 4.
  • a secondary winding 5 wound on a magnetic circuit 6 of the transformer is connected, in series with resistor 3 to two inputs of the processing unit.
  • Resistor 3 is arranged on a circuit 7 separate from the processing unit. This resistance secondary current limit Is when a primary current Ip is very high. She permits thus protecting the electronic circuits of the processing unit.
  • the transformer has a RT transformation ratio predetermined by a number of turns N5 of the secondary winding. Since the primary has only one pass, RT is equal to NS.
  • the winding secondary has a first number of turns wound in a first direction winding and a second number of turns wound in a second winding direction opposite to the first winding direction.
  • the number of turns representative of the difference between the first number and the second number of turns is equivalent to the number of turns NS to determine the transformation ratio.
  • the second number of turns, wound in a direction opposite to the first has the effect of increasing the number of turns of the secondary winding without modify the number of turns concerning the transformation ratio.
  • the second number of turns wound in the opposite direction cancels an equivalent number of turns wound in the first sense.
  • the total increase in the number of turns is intended to increase in the same proportions the total resistance of the secondary winding.
  • the value of the resistance of the secondary winding is increased without decreasing the cross-section of the wire of said winding. This increase in the value of the winding resistance secondary is used to replace the resistor 3 in series with the transformer current and the processing unit.
  • Resistance 3 limitation is achieved by the resistance of the son of all the turns of the secondary winding.
  • the processing unit 4 is directly connected to the secondary winding without additional circuit comprising a resistance of high power limitation.
  • the transformer of current provides a secondary current Is substantially proportional to the primary current Ip flowing in the primary conductor 2 if said primary current is within a range of predetermined operation, or a secondary current attenuated by saturation of the circuit magnetic due to resistance if the primary current is greater than a maximum value of the operating range.
  • FIG. 2 shows a diagram of a protection relay comprising a transformer 8.
  • the secondary winding 5 comprises a first part 5a comprising a first number N1 of turns wound in a first direction and a second part 5b comprising a second number N2 of turns wound in a second direction opposite to the first direction.
  • the first and second parts are connected in series and connected between a first output S1 and a second output S2.
  • the processing unit 4 is connected directly to the first and second outputs S1 and S2 without additional limiting resistance.
  • the transformation ratio of transformer 8 depends on the difference between the first number N1 of turns and the second number N2 of turns. If the primary conductor has only one passage in the transformer, the transformation ratio RT is equal to N1 - N2.
  • the second part 5b comprising a second number N2 of turns wound in the opposite direction of the first, cancels the effects of induction on an equivalent number of turns of the first part Sa.
  • the first part 5a has a first number N1 of turns equivalent to the sum of a number of turns necessary to determine the RT transformation ratio and a number of turns additional equal to the number N2 of turns of the second part 5b.
  • the turns additional of the first part Sa and the turns of the second part 5b are intended to increase the series resistance of the winding and avoid the use of external resistors additional.
  • the total resistance of the winding comprising the first and second parts 5a and 5b connected in series is preferably greater than 5 ohms.
  • the secondary winding has three outputs.
  • the current transformers with three outputs are used to have at least two different transformation ratios depending on the outputs connected to the treatment.
  • the transformer shown in Figure 3 has a first, a second and third outputs respectively S1, S2 and S3 connected to the winding secondary.
  • the secondary winding comprises a first part 5a comprising a first number N1 of turns wound in a first winding direction and a second part 5b comprising a second number N2 of turns wound in a second winding direction opposite to the first.
  • the second part is connected in series with the first one.
  • the secondary winding has a third part 5c comprising a third number N3 of turns wound in the same direction as the turns of the first part 5a.
  • the transformation ratio depends on the difference in the number of turns between the first part 5a and the second part 5b. For example, if the primary has only one pass, a first ratio of transformation RT1 is equal to
  • the limiting resistance is equal to the sum of the resistances of the turns of the first 5a and the second part 5th.
  • a second ratio of RT2 transformation depends on the difference between the sum (N1 + N3) of the number of turns of the first part 5a and of the third part 5c and the number N2 of turns of the second part 5th. If the primary has only one pass, the transformation ratio RT2 is equal to
  • the limiting resistance is equal to the sum of the resistances of the turns of all of the first, second and third parts. Its value is preferably greater than 12 ohms.
  • N1 is greater than N2.
  • the winding resistance is approximately 10 ⁇ between S1 and S2 and approximately 14 ⁇ between S1 and S3.
  • N2 is greater than N1.
  • the total number of turns between S1 and S2 or between S1 and S3 and therefore the values of the limiting resistance are greater than those of the first embodiment.
  • the resistance of the winding is greater than 10 ⁇ between S1 and S2 and greater than 20 ⁇ between S1 and S3.
  • FIG. 4 shows an embodiment of the transformer 15.
  • the magnetic circuit 6 a a toroidal shape and the three parts Sa, 5b and 5c of the secondary winding are each distributed over the entire torus.
  • FIG. 5 represents a diagram of a protection relay.
  • the protection relay comprises three current transformers 9a, 9b and 9c arranged on three conductors of a network to be protected, respectively 2a, 2b and 2c.
  • the secondary winding of each transformer has a first number N1 of turns wound in a first direction and a second number N2 of turns wound in a second direction opposite to the first. The difference between the first N1 and the second N2 number of turns determines the transformation ratio.
  • the limiting resistance of each transformer consists of the resistance of all the turns of each secondary winding.
  • the secondary windings of transformers 9a, 9b and 9c are connected to inputs rectifiers 10a, 10b and 10c respectively.
  • the rectifier outputs are connected to a processing unit 4.
  • Outputs of the processing unit are connected to a relay 11 for controlling the opening of main contacts 12 arranged in series with the conductors 2a, 2b and 2c of the network to be protected.
  • the processing unit 4 and the rectifiers 10a, 10b, and 10c are arranged on a trigger circuit located inside a closed housing 14.
  • the limiting resistances are achieved by the resistance of the secondary windings of the current transformers, in particular by additional turns.
  • the transformation ratios RT, RT1 and RT2 expressed above correspond to the current Ip of the primary conductor 2 with respect to the current Is flowing in the winding secondary. These ratios are theoretical values which do not take account of losses in the magnetic circuit nor the load conditions of the secondary winding. If the number of passages of the primary conductor in the magnetic circuit is greater than one, the transformation ratios will then be inversely proportional to the numbers of passages.
  • the various parts of the secondary windings can be produced in a single operation, for example by reversing the direction of winding during manufacture for the turns of the second part 5b wound in the opposite direction. It is also possible to wind each part independently and then connect the parts according to the direction predetermined winding of their turns.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Emergency Protection Circuit Devices (AREA)

Claims (9)

  1. Stromwandler mit einem, um einen Leistungs-Primärleiter (2) geführten Magnetkern (6) und einer Sekundärwicklung, die
    einen ersten Abschnitt (5a) mit einer ersten Anzahl (N1) von Windungen, welche in einer ersten Wicklungsrichtung um den Magnetkern geführt sind, sowie
    einen zweiten Abschnitt (5b) mit einer zweiten Anzahl (N2) von Windungen umfaßt, welche in einer zur ersten Wicklungsrichtung gegenläufigen zweiten Wicklungsrichtung um den Magnetkern gerührt sind,
    wobei die Differenz zwischen der ersten Windungszahl und der zweiten Windungszahl ein Übersetzungsverhältnis (RT1) bestimmt und
    der Stromwandler dadurch gekennzeichnet ist, daß die Sekundärwicklung
    einen ersten Abgang (S1) der an ein erstes Ende einer, aus dem ersten und dem in Reihe dazu geschalteten zweiten Abschnitt (5a, 5b) bestehenden Anordnung angeschlossen ist,
    einen zweiten Abgang (S2), der an ein zweites Ende der genannten Anordnung angeschlossen ist,
    einen dritten Abschnitt mit einer in der ersten Wicklungsrichtung aufgebrachten dritten Anzahl (N3) von Windungen, der mit einem ersten Ende an ein zweites Ende der Anordnung angeschlossen ist, sowie
    einen dritten Abgang (S3) umfaßt, der an ein zweites Ende des dritten Abschnitts angeschlossen ist.
  2. Stromwandler nach Anspruch 1, dadurch gekennzeichnet, daß die Höhe des elektrischen Widerstands der Reihenschaltung aus dem ersten und dem zweiten Sekundärwicklungsabschnitt größer als fünf Ohm ist.
  3. Stromwandler nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die erste Windungszahl (N1) größer als dreihundert ist.
  4. Stromwandler nach irgendeinem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß
    ein erstes Übersetzungsverhältnis (RT1) zwischen dem ersten Abgang und dem zweiten Abgang durch die Differenz zwischen der ersten Windungszahl (N1) des ersten Abschnitts und der zweiten Windungszahl (N2) des zweiten Abschnitts bestimmt wird und
    ein zweites Übersetzungsverhältnis (RT2) zwischen dem ersten Abgang (S1) und dem dritten Abgang (S3) durch die Differenz zwischen der Summe aus der ersten und der dritten Windungszahl (N1), (N3) des ersten bzw. dritten Abschnitts einerseits und der zweiten Windungszahl (N2) des zweiten Abschnitts andererseits bestimmt wird.
  5. Stromwandler nach irgendeinem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die erste Windungszahl (N1) des ersten Abschnitts größer ist als die zweite Windungszahl (N2) des zweiten Abschnitts.
  6. Stromwandler nach irgendeinem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die erste Windungszahl (N1) des ersten Abschnitts kleiner ist als die zweite Windungszahl (N2) des zweiten Abschnitts.
  7. Stromwandler nach irgendeinem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Wert des elektrischen Widerstands der Sekundärwicklung zwischen dem ersten Abgang (S1) und dem zweiten Abgang (S2) größer als acht Ohm und zwischen dem ersten Abgang (S1) und dem dritten Abgang (S3) größer als zwölf Ohm ist.
  8. Schutzrelais mit einem Stromwandler nach irgendeinem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß es eine Verarbeitungseinheit (4) mit mindestens zwei Eingängen umfaßt, die über zwei elektrische Leiter mit zwei Abgängen (S1, S2, S3) der Sekundärwicklung verbunden sind.
  9. Schutzrelais nach Anspruch 8, dadurch gekennzeichnet, daß die Verarbeitungseinheit (4) in ein geschlossenes Gehäuse (14) eingesetzt ist.
EP19970410098 1996-09-05 1997-09-01 Stromwandler und Schutzrelais mit einem solchen Wandler Expired - Lifetime EP0828265B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9611041A FR2752996B1 (fr) 1996-09-05 1996-09-05 Transformateur de courant et relais de protection comportant un tel transformateur
FR9611041 1996-09-05

Publications (2)

Publication Number Publication Date
EP0828265A1 EP0828265A1 (de) 1998-03-11
EP0828265B1 true EP0828265B1 (de) 2002-11-13

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EP19970410098 Expired - Lifetime EP0828265B1 (de) 1996-09-05 1997-09-01 Stromwandler und Schutzrelais mit einem solchen Wandler

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EP (1) EP0828265B1 (de)
DE (1) DE69717033T2 (de)
ES (1) ES2184976T3 (de)
FR (1) FR2752996B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0990160B1 (de) * 1997-06-16 2001-11-28 Trench Switzerland AG Ringkern-stromwandler mit integriertem messshunt
FR3024601B1 (fr) * 2014-08-01 2016-09-02 Schneider Electric Ind Sas Dispositif d'adaptation d'un signal d'alimentation electrique, systeme d'alimentation electrique et procede d'adaptation d'un signal d'alimentation electrique associes

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3260976A (en) * 1964-06-30 1966-07-12 Gen Electric Current transformer
FR2512264A1 (fr) * 1981-08-26 1983-03-04 Merlin Gerin Capteur de courant hybride compense
DE3218823C2 (de) * 1982-04-22 1984-06-20 LGZ Landis & Gyr Zug AG, Zug Meßwandleranordnung mit zwei Magnetkernen
JPS60103607A (ja) * 1983-11-10 1985-06-07 Hitachi Ltd 地絡電流検出装置
JPH07235427A (ja) * 1994-02-21 1995-09-05 Shirogane Seisakusho:Kk 昇圧トランスおよびその巻線方法

Also Published As

Publication number Publication date
FR2752996B1 (fr) 1998-10-02
DE69717033T2 (de) 2003-07-10
FR2752996A1 (fr) 1998-03-06
ES2184976T3 (es) 2003-04-16
DE69717033D1 (de) 2002-12-19
EP0828265A1 (de) 1998-03-11

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