EP0026158B1 - Transformer with variable ratio and static compensator with flipflop - Google Patents

Transformer with variable ratio and static compensator with flipflop Download PDF

Info

Publication number
EP0026158B1
EP0026158B1 EP80810293A EP80810293A EP0026158B1 EP 0026158 B1 EP0026158 B1 EP 0026158B1 EP 80810293 A EP80810293 A EP 80810293A EP 80810293 A EP80810293 A EP 80810293A EP 0026158 B1 EP0026158 B1 EP 0026158B1
Authority
EP
European Patent Office
Prior art keywords
transformer
control
variable ratio
winding
turns
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
Application number
EP80810293A
Other languages
German (de)
French (fr)
Other versions
EP0026158A1 (en
Inventor
Gérald Roberge
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.)
Hydro Quebec
Original Assignee
Hydro Quebec
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 Hydro Quebec filed Critical Hydro Quebec
Publication of EP0026158A1 publication Critical patent/EP0026158A1/en
Application granted granted Critical
Publication of EP0026158B1 publication Critical patent/EP0026158B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias

Definitions

  • the present invention relates to a control transformer which can be used in particular as or for the production of a transformer with variable transformation ratio as well as for the production of a static rocker compensator.
  • the subject of the present invention is a control transformer applying the general principle of variable inductance for single-phase and three-phase circuits already described in European patent application No. 79400766.6 filed on October 19, 1979 in the name of the applicant and published April 30, 1980.
  • the present invention therefore relates to a control transformer which can advantageously be used as it is as a variable ratio transformer or which can be optionally coupled to a traditional transformer to form a variable ratio transformer where the load which the control transformer has to bear is decreased.
  • the first and second magnetic circuits are arranged with respect to each other so as to define at least two common magnetic spaces in which the respective alternating and continuous magnetic fields are superposed orthogonally to orient the magnetic dipoles of the common spaces in a direction predetermined by the intensity of the direct current magnetic field of the second circuit and thus controlling the permeability of the first magnetic field circuit in alternating field.
  • this control transformer can be coupled to a traditional transformer comprising N 1 turns at the primary and N 2 turns at the secondary, N 1 and N 2 being chosen so as to respect the inequality
  • the respective primary and secondary are connected in series, thus forming the primary and secondary of a variable ratio transformer capable of withstanding heavy loads.
  • variable ratio transformer can be used in a three-phase circuit.
  • a variable ratio transformer is used for each phase.
  • Tertiary windings can be added to control transformers. These windings have the effect of filtering the flow of 3rd harmonic if the transformer is used in its saturation zone.
  • the three control transformers or the three traditional transformers can also be mounted in a single unit.
  • FIG. 1 represents a developed view of the circumference of a control transformer for a three-phase circuit
  • Figure 2 shows a phase of a variable ratio transformer
  • Figure 3 shows a graph showing the results of an application of the variable ratio transformer illustrated in FIG. 2
  • FIG. 4 represents a phase of a static rocker compensator
  • FIG. 5 represents the connections to a phase of the static compensator illustrated in FIG. 4
  • FIG. 6 represents an oscillogram showing the results of an application of the compensator.
  • the control transformer illustrated in Figure 1 has a cylindrical core 1 whose circumference is a view developed for the purpose of simplification.
  • This core 1 comprises three legs 3, two rings 5 and a control core 7 perpendicular to the legs 3. From the mechanical point of view, the core 1 can be separated into several blocks in order to facilitate its construction, as described in detail. in the above-mentioned patent application No. 79400766.6.
  • the exact shape of the core can be varied. However, certain specific characteristics can improve the performance of the transformer.
  • the sheets will preferably be tangent to the rings forming the core, by concentric superposition of the sheets, for example.
  • the nuclei carrying the continuous field will preferably cut the nuclei carrying the alternating field (by manufacturing the nuclei of the alternative in two parts fixed to the nuclei of the continuous, for example) or the two types of nuclei will intersect mutually (by alternating the two series of sheets in the common region).
  • the cross section of the cores of the continuous will be equal to or greater than that of the cores of the alternative.
  • the control transformer comprises three primary windings A-A ', B-B' and C-C 'and three secondary windings a-a', b-b 'and c-c'.
  • Each set of primary and secondary windings is located on a particular leg 3 of the core.
  • Each leg also carries a tertiary winding 4.
  • These three tertiary windings connected in delta, can be used to filter the flow of third harmonic, if the transformer must work in saturation zone.
  • a control winding 9 surrounds the control core 7.
  • This control transformer operates in a similar fashion to the variable inductance described in co-pending application No. 79400766.6. It is thus possible to vary the inductance of the alternating circuit and consequently the transformation ratio of the transformer causing the circulating current to vary. lant in the control winding 9.
  • control transformer illustrated in Figure 1 can be used for the realization of a variable ratio transformer capable of supporting high loads.
  • This variable ratio transformer 10 comprises a control transformer 11 as previously described and a traditional transformer 13.
  • a single production phase with three-phase circuit is presented in FIG. 2, for the purpose of simplification.
  • the primary 15 of the control transformer 11, comprising n 1 turns, is connected in series with the primary 21 of the traditional transformer 13 comprising N 1 turns.
  • An alternating voltage source 25 is connected to the terminals of the primaries 15 and 21. The voltage Vp is measured there.
  • the secondary 17 of the control transformer 11, comprising n 2 turns, is connected in series with the secondary 23 of the traditional transformer 13, comprising N 2 turns.
  • a load 27 is connected to the terminals of the secondary 17 and 23. The voltage Vs is measured there.
  • variable ratio transformer it is necessary that be different from Indeed, if is equal to the control current has no effect on the load voltage.
  • the tertiary 19 of the control transformer 11 can be connected in delta with the tertiary of the other phases (not shown), depending on the operating range of the transformer. This connection reduces the flow of the third harmonic.
  • the control current Ic flowing in the control winding 9 is also measured.
  • variable ratio transformer can be applied to the production of a static rocker compensator 29.
  • the compensator 29 comprises a control transformer 11 as previously described and a traditional transformer 31 having a socket 33 to N 2 turns, a socket 35 to N 3 turns and a socket 37 to N 4 turns.
  • a return socket 39, at the secondary input of the control transformer, is also provided.
  • n 1 , n 2 , N 1 , N 2 , N 3 and N 4 are chosen so as to meet the following conditions:
  • a fixed capacitor C is connected to the socket 33 and a fixed or variable inductance L to the socket 37, the return being common (socket 39).
  • this arrangement behaves like a load which can take a capacitive value or an inductive value depending on the magnitude of the control current.
  • the tertiary winding 19 can be used or omitted.
  • the compensator can also serve, and simultaneously, as a power transformer.
  • FIG. 5 An assembly illustrating the behavior of the static rocker compensator is presented in FIG. 5 and an oscillogram illustrating the results appears in FIG. 6.
  • variable ratio transformer is presented as a single unit.
  • a voltage Vp is applied to the primary, and a current Ip is measured.
  • the direct current Icc supplied by a source Vcc is applied to a control winding.
  • sockets V 1 , V 2 , V 3 and N correspond to sockets 33, 35, 37 and 39 of the circuit in Figure 4.
  • the inductance is crossed by the current I L , the resistive load R by Ir and the capacitor C by lc.
  • the inductive current I L and the capacitive current Ic change immediately. This results in a variation of the angle of the power factor.
  • This compensator is therefore functional.
  • the current Ir of the resistive load has not changed. It is therefore possible to use the same device both as a compensator and as a power transformer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)
  • Ac-Ac Conversion (AREA)

Description

La présente invention a pour objet un transformateur de contrôle qui peut être notamment utilisé comme ou pour la réalisation d'un transformateur à rapport de transformation variable ainsi que pour la réalisation d'un compensateur statique à bascule.The present invention relates to a control transformer which can be used in particular as or for the production of a transformer with variable transformation ratio as well as for the production of a static rocker compensator.

Plus précisément, la présente invention a pour objet un transformateur de contrôle appliquant le principe général de l'inductance variable pour circuits monophasés et triphasés déjà décrite dans la demande européene de brevet No. 79400766.6 déposée le 19 octobre 1979 au nom de la demanderesse et publiée le 30 avril 1980.More specifically, the subject of the present invention is a control transformer applying the general principle of variable inductance for single-phase and three-phase circuits already described in European patent application No. 79400766.6 filed on October 19, 1979 in the name of the applicant and published April 30, 1980.

Il a maintenant été découvert qu'en dotant le noya principal de l'inductance variable décrite dans cette demande d'un enroulement supplémentaire, il était possible d'étendre considérablement la gamme d'application de cette invention en particulier pour les circuits triphasés.It has now been discovered that by providing the main core with the variable inductance described in this application with an additional winding, it was possible to considerably extend the range of application of this invention, in particular for three-phase circuits.

La présente invention concerne donc un transformateur de contrôle qui peut avantageusement être utilisé tel quel comme transformateur à rapport variable ou qui peut être le cas échéant couplé à un transformateur traditionnel pour former un transformateur à rapport variable où la charge que doit supporter le transformateur de contrôle est diminuée.The present invention therefore relates to a control transformer which can advantageously be used as it is as a variable ratio transformer or which can be optionally coupled to a traditional transformer to form a variable ratio transformer where the load which the control transformer has to bear is decreased.

Le transformateur de contrôle selon l'invention comporte:

  • - un premier circuit magnétique fermé, formé d'un premier noyau ferromagnétique à travers lequel circule un champ magnétique alternatif, ce premier noyau ferromagnétique supportant un enroulement primaire de n1 tours et un enroulement secondaire de n2 tours, et
  • - un second circuit magnétique fermé, formé d'un second noyau ferromagnétique, à travers lequel circule un champ magnétique à courant continu réglable.
The control transformer according to the invention comprises:
  • a first closed magnetic circuit formed from a first ferromagnetic core through which an alternating magnetic field circulates, this first ferromagnetic core supporting a primary winding of n 1 turns and a secondary winding of n 2 turns, and
  • - a second closed magnetic circuit, formed of a second ferromagnetic core, through which a magnetic field with adjustable direct current flows.

Selon l'invention, les premier et second circuits magnétiques sont disposés l'un par rapport à l'autre de façon à définir au moins deux espaces magnétiques communs dans lesquels les champs magnétiques alternatif et continu respectifs se superposent orthogonalement pour orienter les dipôles magnétiques des espaces communs suivant une direction prédéterminée par l'intensité du champ magnétique à courant continu du second circuit et ainsi contrôler la perméabilité du premier circuit magnétique à champ alternatif.According to the invention, the first and second magnetic circuits are arranged with respect to each other so as to define at least two common magnetic spaces in which the respective alternating and continuous magnetic fields are superposed orthogonally to orient the magnetic dipoles of the common spaces in a direction predetermined by the intensity of the direct current magnetic field of the second circuit and thus controlling the permeability of the first magnetic field circuit in alternating field.

Selon un premier mode de réalisation particulière de l'invention, ce transformateur de contrôle peut être couplé à un transformateur traditionnel comportant N1 tours au primaire et N2 tours au secondaire, N1 et N2 étant choisis de façon à respecter l'inéquationAccording to a first particular embodiment of the invention, this control transformer can be coupled to a traditional transformer comprising N 1 turns at the primary and N 2 turns at the secondary, N 1 and N 2 being chosen so as to respect the inequality

Figure imgb0001
Figure imgb0001

Les primaires et secondaires respectifs sont reliés en série, formant ainsi les primaire et secondaire d'un transformateur à rapport variable capable de supporter de fortes charges.The respective primary and secondary are connected in series, thus forming the primary and secondary of a variable ratio transformer capable of withstanding heavy loads.

Ce type de transformateur à rapport variable peut être utilisé dans un circuit triphasé. Dans ce cas, un transformateur à rapport variable est employé pour chaque phase. Des enroulements tertiaires peuvent être ajoutés aux transformateurs de contrôle. Ces enroulements ont pour effet de filtrer le flux de 3ème harmonique si le transformateur est utilisé dans sa zone de saturation.This type of variable ratio transformer can be used in a three-phase circuit. In this case, a variable ratio transformer is used for each phase. Tertiary windings can be added to control transformers. These windings have the effect of filtering the flow of 3rd harmonic if the transformer is used in its saturation zone.

On peut également monter les trois transformateurs de contrôle ou les trois transformateurs traditionnels en une seule unité.The three control transformers or the three traditional transformers can also be mounted in a single unit.

Selon un second mode de réalisation particulière de l'invention, en ajoutant une prise au secondaire du transformateur à rapport variable précédemment décrit, on peut constituer un compensateur statique ayant un temps de réponse très court.According to a second particular embodiment of the invention, by adding a socket to the secondary of the variable ratio transformer previously described, it is possible to constitute a static compensator having a very short response time.

Le compensateur statique à bascule selon l'invention ainsi comprend:

  • -un transformateur à rapport variable présentant une première prise à Nz tours et une seconde prise à un nombre de tours N4 inférieur à N2 sur l'enroulement secondaire du transformateur traditionnel, n1, n2, N1, N2 et N4 étant choisis de façon à ce que
    Figure imgb0002
  • - un condensateur relié d'un côté à l'une des prises et de l'autre côté à l'entrée du secondaire du transformateur de contrôle; et
  • ­ υne inductance reliée d'un côté à l'autre des prises et de l'autre côté à l'entrée du secondaire du transformateur de contrôle.
The tilting static compensator according to the invention thus comprises:
  • a variable ratio transformer having a first tap at N z turns and a second tap at a number of turns N 4 less than N 2 on the secondary winding of the traditional transformer, n 1 , n 2 , N 1 , N 2 and N 4 being chosen so that
    Figure imgb0002
  • - a capacitor connected on one side to one of the sockets and on the other side to the secondary input of the control transformer; and
  • An inductor connected from one side to the other of the sockets and on the other side to the secondary input of the control transformer.

La présente invention sera mieux comprise au moyen de la description d'exemples de réalisation donnés à titre non limitatif. Cette description sera faite en référence aux dessins annexés, où
la figure 1 représente une vue développée de la circonférence d'un transformateur de contrôle pour circuit triphasé; la figure 2 représente une phase d'un transformateur à rapport variable; la figure 3 représente un graphique donnant les résultats d'une application du transformateur à rapport variable illustré à la figure 2; la figure 4 représente une phase d'un compensateur statique à bascule; la figure 5 représente les connections à une phase du compensateur statique illustré à la figure 4; et la figure 6 représente un oscillogramme montrant les résultats d'une application du compensateur.The present invention will be better understood by means of the description of exemplary embodiments given without limitation. This description will be made with reference to the accompanying drawings, where
FIG. 1 represents a developed view of the circumference of a control transformer for a three-phase circuit; Figure 2 shows a phase of a variable ratio transformer; Figure 3 shows a graph showing the results of an application of the variable ratio transformer illustrated in FIG. 2; FIG. 4 represents a phase of a static rocker compensator; FIG. 5 represents the connections to a phase of the static compensator illustrated in FIG. 4; and FIG. 6 represents an oscillogram showing the results of an application of the compensator.

Le transformateur de contrôle illustré à la figure 1 présente un noyau cylindrique 1 dont la circonférence est une vue développée dans un but de simplification. Ce noyau 1 comprend trois jambes 3, deux bagues 5 et un noyau de contrôle 7 perpendiculaire aux jambes 3. Du point de vue mécanique, le noyau 1 peut être séparé en plusieurs blocs afin d'en faciliter la construction, tel que décrit en détail dans la demande de brevet No. 79400766.6 ci-dessus mentionnée.The control transformer illustrated in Figure 1 has a cylindrical core 1 whose circumference is a view developed for the purpose of simplification. This core 1 comprises three legs 3, two rings 5 and a control core 7 perpendicular to the legs 3. From the mechanical point of view, the core 1 can be separated into several blocks in order to facilitate its construction, as described in detail. in the above-mentioned patent application No. 79400766.6.

La forme exacte du noyau peut être variée Toutefois, certaines caractéristiques particulières peuvent améliorer les performances du transformateur. Les tôles seront préférablement tangentes aux anneaux formant le noyau, par superposition concentrique des tôles, par exemple. Les noyaux portant le champ continu couperont préférablement les noyaux portant le champ alternatif (en fabriquant les noyaux de l'alternatif en deux parties fixées aux noyaux du continu, par exemple) ou les deux types de noyaux s'entrecouperont mutuellement (en alternant les deux séries de tôles dans la région commune). La section droite des noyaux du continu sera égale ou plus grande que celle des noyeau de l'alternatif.The exact shape of the core can be varied. However, certain specific characteristics can improve the performance of the transformer. The sheets will preferably be tangent to the rings forming the core, by concentric superposition of the sheets, for example. The nuclei carrying the continuous field will preferably cut the nuclei carrying the alternating field (by manufacturing the nuclei of the alternative in two parts fixed to the nuclei of the continuous, for example) or the two types of nuclei will intersect mutually (by alternating the two series of sheets in the common region). The cross section of the cores of the continuous will be equal to or greater than that of the cores of the alternative.

La présence d'une ouverture dans la région contenant les espaces magnétiques communs améliorera également les performances.The presence of an opening in the region containing the common magnetic spaces will also improve performance.

Evidemment, l'absence de ces caractéristiques réduira seulement l'efficacité du transformateur, sans en annuler les performances.Obviously, the absence of these characteristics will only reduce the efficiency of the transformer, without canceling its performance.

Le transformateur de contrôle comprend trois enroulements primaires A-A', B-B' et C-C' et trois enroulements secondaires a-a', b-b' et c-c'. Chaque ensemble d'enroulements primaire et secondaire est situé sur une jambe particulière 3 du noyau. Chaque jambe porte également un enroulement tertiaire 4. Ces trois enroulements tertiaires 4, reliés en delta, peuvent être employés pour filtrer le flux de troisième harmonique, si le transformateur doit travailler en zone de saturation.The control transformer comprises three primary windings A-A ', B-B' and C-C 'and three secondary windings a-a', b-b 'and c-c'. Each set of primary and secondary windings is located on a particular leg 3 of the core. Each leg also carries a tertiary winding 4. These three tertiary windings 4, connected in delta, can be used to filter the flow of third harmonic, if the transformer must work in saturation zone.

Un enroulement de contrôle 9 entoure le noyau de contrôle 7. Ce transformateur de contrôle fonctionne de façon semblable à l'inductance variable décrite dans la demande No. 79400766.6 en co-instance. On peut ainsi faire varier l'inductance du circuit alternatif et par conséquent le rapport de transformation du transformateur faisant varier le courant circu-. lant dans l'enroulement de contrôle 9.A control winding 9 surrounds the control core 7. This control transformer operates in a similar fashion to the variable inductance described in co-pending application No. 79400766.6. It is thus possible to vary the inductance of the alternating circuit and consequently the transformation ratio of the transformer causing the circulating current to vary. lant in the control winding 9.

Le transformateur de contrôle illustré sur la figure 1 peut être utilisé pour la réalisation d'un transformateur à rapport variable capable de supporter de fortes charges. Ce transformateur à rapport variable 10 comprend un transformateur de contrôle 11 tel que précédemment décrit et un transformateur traditionnel 13. Une seule phase de réalisation avec circuit triphasé est présentée à la figure 2, dans un but de simplification.The control transformer illustrated in Figure 1 can be used for the realization of a variable ratio transformer capable of supporting high loads. This variable ratio transformer 10 comprises a control transformer 11 as previously described and a traditional transformer 13. A single production phase with three-phase circuit is presented in FIG. 2, for the purpose of simplification.

Le primaire 15 du transformateur de contrôle 11, comprenant n1 tours, est connecté en série avec le primaire 21 du transformateur traditionnel 13 comprenant N1 tours. Une source de tension alternative 25 est connectée aux bornes des primaires 15 et 21. On y mesure la tension Vp.The primary 15 of the control transformer 11, comprising n 1 turns, is connected in series with the primary 21 of the traditional transformer 13 comprising N 1 turns. An alternating voltage source 25 is connected to the terminals of the primaries 15 and 21. The voltage Vp is measured there.

Le secondaire 17 du transformateur de contrôle 11, comprenant n2 tours, est connecté en série avec le secondaire 23 du transformateur traditionnel 13, comprenant N2 tours. Une charge 27 est connectée aux bornes des secondaires 17 et 23. On y mesure la tension Vs.The secondary 17 of the control transformer 11, comprising n 2 turns, is connected in series with the secondary 23 of the traditional transformer 13, comprising N 2 turns. A load 27 is connected to the terminals of the secondary 17 and 23. The voltage Vs is measured there.

Il est à signaler que, dans le cas de ce transformateur à rapport variable, il faut que

Figure imgb0003
soit différent de
Figure imgb0004
En effet, si
Figure imgb0005
est égal à
Figure imgb0006
le courant de contrôle n'a pas d'effet sur la tension de la charge.It should be noted that, in the case of this variable ratio transformer, it is necessary that
Figure imgb0003
 be different from
Figure imgb0004
 Indeed, if
Figure imgb0005
 is equal to
Figure imgb0006
 the control current has no effect on the load voltage.

Le tertiaire 19 du transformateur de contrôle 11 peut être connecté en delta avec le tertiaire des autres phases (non représentées), selon la plage de fonctionnement du transformateur. Cette connexion permet de réduire le flux de troisième harmonique.The tertiary 19 of the control transformer 11 can be connected in delta with the tertiary of the other phases (not shown), depending on the operating range of the transformer. This connection reduces the flow of the third harmonic.

Le courant de contrôle Ic circulant dans l'enroulement de contrôle 9 est aussi mesuré.The control current Ic flowing in the control winding 9 is also measured.

Un graphique de la tension Vs en fonction du courant de contrôle Ic est présenté à la figure 3 pour diverses charges. Pour la réalisation de ce graphique, on a utilisé un transformateur à rapport variable dont les primaires étaient connectés en Y avec neutre à la masse et les secondaires en Y avec neutre flottant. Les tertiaires étaient ouverts et les conditions expérimentales les suivantes:

Figure imgb0007
Figure imgb0008
Tension de saturation sur N,=500V (environ) Tension de saturation sur n1=65V

  • Vp=100 Volts
  • Vs mesuré en Volts
  • Ic mesuré en Amp-tours c.c.
A graph of the voltage Vs as a function of the control current Ic is presented in FIG. 3 for various loads. For the realization of this graph, we used a variable ratio transformer whose primaries were connected in Y with ground neutral and the secondary in Y with floating neutral. The tertiary sector was open and the following experimental conditions:
Figure imgb0007
Figure imgb0008
 Saturation voltage on N, = 500V (approx.) Saturation voltage on n 1 = 65V
  • Vp = 100 Volts
  • Vs measured in Volts
  • Ic measured in Amp-turns cc

On peut voir, sur les courbes, que la tension Vs mesurée au secondaire varie selon la grandeur du courant de contrôle Ic. Il est aussi à remarquer que la nature capacitive ou inductive de la charge a une influence sur le sens de la variation.It can be seen on the curves that the voltage Vs measured at the secondary varies according to the magnitude of the control current Ic. It should also be noted that the capacitive or inductive nature of the load has an influence on the direction of the variation.

Tel qu'illustré à la figure 4, le transformateur à rapport variable précédemment décrit peut être appliqué à la réalisation d'un compensateur statique à bascule 29. Le compensateur 29 comprend un transformateur de contrôle 11 tel que précédemment décrit et un transformateur traditionnel 31 présentant une prise 33 à N2 tours, une prise 35 à N3 tours et une prise 37 à N4 tours. Une prise de retour 39, à l'entrée du secondaire du transformateur de contrôle, est aussi prévue. n1, n2, N1, N2, N3 et N4 sont choisis de façon à respecter les conditions suivantes:As illustrated in FIG. 4, the variable ratio transformer previously described can be applied to the production of a static rocker compensator 29. The compensator 29 comprises a control transformer 11 as previously described and a traditional transformer 31 having a socket 33 to N 2 turns, a socket 35 to N 3 turns and a socket 37 to N 4 turns. A return socket 39, at the secondary input of the control transformer, is also provided. n 1 , n 2 , N 1 , N 2 , N 3 and N 4 are chosen so as to meet the following conditions:

Figure imgb0009
Figure imgb0009

Il est à remarquer l'inversion des signes d'inégalité pour N2 et N4, de façon à inverser l'action de la partie capacitive par rapport à l'action de la partie inductive. L'égalite dans le cas de N3 permet de mettre une charge qui ne subisse pas l'influence du courant de contrôle.Note the inversion of the signs of inequality for N 2 and N 4 , so as to reverse the action of the capacitive part with respect to the action of the inductive part. The equality in the case of N 3 makes it possible to put a load which is not subjected to the influence of the current of control.

Un condensateur fixe C est relié à la prise 33 et une inductance fixe ou variable L à la prise 37, le retour étant commun (prise 39).A fixed capacitor C is connected to the socket 33 and a fixed or variable inductance L to the socket 37, the return being common (socket 39).

En faisant varier l'intensité du courant de contrôle dans le transformateur de contrôle, on obtient une augmentation du courant capacitif et une diminution du courant inductif ou vice-versa.By varying the intensity of the control current in the control transformer, one obtains an increase in the capacitive current and a decrease in the inductive current or vice versa.

Vu du primaire, cet arrangement se comporte comme une charge pouvant prendere une valeur capacitive ou une valeur inductive selon la grandeur du courant de contrôle.Seen from the primary, this arrangement behaves like a load which can take a capacitive value or an inductive value depending on the magnitude of the control current.

Selon la plage de régulation requise, l'enroulement tertiaire 19 peut être utilisé ou omis.Depending on the required regulation range, the tertiary winding 19 can be used or omitted.

La prise à N3 tours du compensateur statique permet la connexion d'une charge qui ne subirait pas l'influence du courant de contrôle. De cette façon, le compensateur peut aussi servir, et simultanément, de transformateur de puissance.Taking the static compensator at N 3 turns allows the connection of a load which would not be influenced by the control current. In this way, the compensator can also serve, and simultaneously, as a power transformer.

Un montage illustrant le comportement du compensateur statique à bascule est présenté à la figure 5 et un oscillogramme en illustrant les résultats apparaît à la figure 6.An assembly illustrating the behavior of the static rocker compensator is presented in FIG. 5 and an oscillogram illustrating the results appears in FIG. 6.

Dans ce montage, le transformateur à rapport variable se présente comme une seule unité.In this arrangement, the variable ratio transformer is presented as a single unit.

Une tension Vp est appliquée au primaire, et un courant Ip est mesuré.A voltage Vp is applied to the primary, and a current Ip is measured.

Le courant continu Icc fourni par une source Vcc est appliqué à un enroulement de contrôle.The direct current Icc supplied by a source Vcc is applied to a control winding.

Du côté du secondaire, des prises V1, V2, V3 et N correspondent aux prises 33, 35, 37 et 39 du circuit de la figure 4.On the secondary side, sockets V 1 , V 2 , V 3 and N correspond to sockets 33, 35, 37 and 39 of the circuit in Figure 4.

L'inductance est traversée par le courant IL, la charge résistive R par Ir et le condensateur C par lc.The inductance is crossed by the current I L , the resistive load R by Ir and the capacitor C by lc.

Un échelon de tension est appliqué à la source Vcc, fournissant le courant de contrôle, durant 5 cycles environ. Les résultats suivants ont été enregistrés:

Figure imgb0010
A voltage step is applied to the source Vcc, supplying the control current, for approximately 5 cycles. The following results were recorded:
Figure imgb0010

Comme on peut le constater, dés que l'échelon est appliqué, les courants inductif IL et capacitif Ic changent immédiatement. Il en résulte une variation de l'angle du facteur de puissance. Ce compensateur est donc fonctionnel. De plus, on constate que le courant Ir de la charge résistive n'a pas changé. Il est donc possible d'utiliser le même appareil à la fois comme compensateur et comme transformateur de puissance.As can be seen, as soon as the step is applied, the inductive current I L and the capacitive current Ic change immediately. This results in a variation of the angle of the power factor. This compensator is therefore functional. In addition, it can be seen that the current Ir of the resistive load has not changed. It is therefore possible to use the same device both as a compensator and as a power transformer.

Claims (13)

1. Control transformer comprising a first closed magnetic circuit consisting of a first ferromagnetic core (3) through which an alternating current magnetic field circulates, said first ferromagnetic core (3) supporting a primary winding having n1 turns and a secondary winding having n2 turns, and a second closed magnetic circuit consisting of a second ferromagnetic core (7) through which an adjustable direct current magnetic field circulates characterized in that said first and second magnetic circuits are located with respect to each other so as to define at least two common magnetic spaces in which the respective alternating and direct current magnetic fields are superposed orthogonally so as to orient the magnetic c ipoles of said common spaces along a direction determined by the amplitude of said direct current magnetic field of the second circuit and for controlling the permeability of said first alternating magnetic circuit to said alternating field.
2. Variable ratio transformer characterized in that it comprises a conventional transformer (13) including a primary winding of N1 turns and a secondary winding of N2 turns; and a control transformer (11) as defined in claim 1, said control transformer having its primary winding (n,) connected in series with the primary winding (N1) of the conventional transformer and its secondary winding (n2) connected in series with the secondary winding (Nz) of the conventional transformer, said primary and secondary windings of said conventional and control transformers being chosen such that the ratio
Figure imgb0019
is different from the ratio
Figure imgb0020
said primary and secondary windings forming together the primary and secondary windings of said variable ratio transformer (11), said ratio being controlled by said direct current forming said direct current magnetic field.
3. Variable ratio transformer adapted for a three-phase circuit, characterized in that it comprises a variable ratio transformer according to claim 2 for each phase of the circuit, each of the control transformers of said variable ratio transformers including a tertiary winding (19), said tertiary windings of the three control transformers being delta-connected.
4. Variable ratio transformer adapted for a phase circuit according to claim 3, characterized in that the control transformers (11) form a single unit with a single control winding (9).
5. Variable ratio transformer adapted for a phase circuit according to either claim 3 or claim 4, characterized in that the conventional transformers form a single unit.
6. Static balance compensator characterized in that it comprises a variable ratio transformer as defined in claim 2, said variable ratio transformer comprising a first tap at N2 turns and a second tap at N4 turns, N4 being less than N2 on the secondary winding of the conventional transformer (31, fig. 4) n1, n2, N1, N2. and N4 being chosen such that
Figure imgb0021
a capacitor (c) connected at one end to one (33) of said taps and at the other end to the inlet of secondary winding (n2) of the control transformer (11), and an inductor connected at one end to the other (37) of said taps and at the other end to the inlet of the secondary of winding (n2) of the control transformer.
7. Static balance compensator according to claim 6, characterized in that the variable ratio transformer includes a third tap (35) at N3 turns on the secondary winding of its conventional transformer (31), N3 being between N2 and N4 with N3 being chosen in accordance with the equation
Figure imgb0022
8. Static balance compensator adapted for a three-phase circuit, characterized in that it comprises a static balance compensator according to either claim 6 or 7 for each phase of the circuit, each of the control transformers of said static balances including a tertiary winding (19), said tertiary windings (19) of said three control transformers being delta-connected.
9. Transformer according to claim 1 characterized in that said common magnetic spaces are perforated.
10. Transformer according to claim 1, characterized in that the cores form rings and are made of a plurality of concentrical iron sheets tangent to the rings.
11. Transformer according to claim 1 characterized in that the cross-section of the first core is not larger than the cross-section of the second core.
12. Transformer according to claim 1, characterized in that the first core is made of two half-rings fixed to the second core.
13. Static compensator according to claim 6, wherein the inductor is variable.
EP80810293A 1979-09-19 1980-09-18 Transformer with variable ratio and static compensator with flipflop Expired EP0026158B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA335,971A CA1126357A (en) 1979-09-19 1979-09-19 Variable ratio transformer and static compensator
CA335971 1979-09-19

Publications (2)

Publication Number Publication Date
EP0026158A1 EP0026158A1 (en) 1981-04-01
EP0026158B1 true EP0026158B1 (en) 1984-02-15

Family

ID=4115170

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80810293A Expired EP0026158B1 (en) 1979-09-19 1980-09-18 Transformer with variable ratio and static compensator with flipflop

Country Status (4)

Country Link
US (1) US4445082A (en)
EP (1) EP0026158B1 (en)
CA (1) CA1126357A (en)
DE (1) DE3066610D1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4970656A (en) * 1986-11-07 1990-11-13 Alcon Laboratories, Inc. Analog drive for ultrasonic probe with tunable phase angle
US5001649A (en) * 1987-04-06 1991-03-19 Alcon Laboratories, Inc. Linear power control for ultrasonic probe with tuned reactance
US5523673A (en) * 1994-03-04 1996-06-04 Marelco Power Systems, Inc. Electrically controllable inductor
EP0969486A4 (en) * 1997-12-17 2001-03-07 Tohoku Electric Power Co Flux-controlled variable tranformer
TW535175B (en) 2000-10-16 2003-06-01 Primarion Inc System and method for orthogonal inductance variation
NO322286B1 (en) * 2004-12-23 2006-09-11 Magtech As Device and method for reducing harmonics in a three-phase power supply
TW201117543A (en) * 2009-11-06 2011-05-16 Green Solution Tech Co Ltd Power supply converter
JP4800451B1 (en) * 2011-06-10 2011-10-26 株式会社精電製作所 High frequency transformer
US9343996B2 (en) 2014-02-04 2016-05-17 Pavel Dourbal Method and system for transmitting voltage and current between a source and a load

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB474209A (en) * 1936-04-06 1937-10-27 British Thomson Houston Co Ltd Improvements in and relating to electric transformers
FR991932A (en) * 1949-08-04 1951-10-11 Asea Ab Transducer
FR1124831A (en) * 1955-05-18 1956-10-18 Femarc Magnetic shunt transformer adjustable by auto-saturation
US2844804A (en) * 1955-07-06 1958-07-22 Letourneau Westinghouse Compan Control transformer
US3087108A (en) * 1957-01-03 1963-04-23 Dominic S Toffolo Flux switching transformer
DE1126986B (en) * 1960-02-05 1962-04-05 Fuji Electric Co Ltd Transformer set with a main transformer and a regulating transformer connected to its neutral point
GB1058407A (en) * 1965-01-06 1967-02-08 Gen Electric Co Ltd Improvements in or relating to saturable reactors
DE1565795B1 (en) * 1966-04-04 1970-07-02 Secheron Atel Arc welding arrangement
US3617858A (en) * 1969-07-07 1971-11-02 Warren Petroleum Corp Excitation of alternating current machinery
US3622868A (en) * 1970-02-06 1971-11-23 Joachim H Todt Regulating power transformer with magnetic shunt
US3757201A (en) * 1972-05-19 1973-09-04 L Cornwell Electric power controlling or regulating system
IN144527B (en) * 1976-10-06 1978-05-13 Inst Elektroswarki Patona
CA1095601A (en) * 1978-08-28 1981-02-10 Alfred M. Hase Regulating transformer with magnetic shunt

Also Published As

Publication number Publication date
US4445082A (en) 1984-04-24
DE3066610D1 (en) 1984-03-22
CA1126357A (en) 1982-06-22
EP0026158A1 (en) 1981-04-01

Similar Documents

Publication Publication Date Title
EP0109096B1 (en) Variable inductance device
EP0026158B1 (en) Transformer with variable ratio and static compensator with flipflop
US6317021B1 (en) Variable inductor
CA2092084A1 (en) Phase-shifting transformer system
EP2847774B1 (en) Three-phase rotary magnetic shell-type transformer with three magnetic cores
WO2013167829A1 (en) Three-phase/two-phase rotary transformer
EP3678151B1 (en) Polyphase inductive filter
FR2569880A1 (en) EXTRUSION APPARATUS FOR FLUIDS
US2399872A (en) Electrically operating regulating device
WO2020204686A1 (en) Electrical self-induction transformer
CH233014A (en) Circuit with a magnetic amplifier.
FR2619735A1 (en) DEVICE FOR COMPENSATING REACTIVE CURRENT IN RELATION TO THE CHARGE FOR A TRANSFORMER, PARTICULARLY FOR A WELDING TRANSFORMER
RU1835590C (en) Multi-phase magnetic amplifier
EP0184493A1 (en) DC-DC converter with a chopping switch and transformer
FR3112886A1 (en) Assembly comprising at least a first and a second inductor
DE428873C (en) Bridge circuit with induction coils with a magnetic core for frequency multiplication or control of transmitters for wireless telegraphy and telephony
BE441290A (en)
BE401888A (en)
CH238735A (en) Secondary voltage transformer continuously adjustable in magnitude and sign.
BE402966A (en)
BE364335A (en) Device for adjusting the voltage of power transformers or lines under load
BE387750A (en)
FR2570867A1 (en) Inductor, in particular for microwave monolithic integrated circuits
BE358947A (en)
BE628907A (en)

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

Designated state(s): BE CH DE FR GB SE

17P Request for examination filed

Effective date: 19810707

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): BE CH DE FR GB LI SE

REF Corresponds to:

Ref document number: 3066610

Country of ref document: DE

Date of ref document: 19840322

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19840830

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19840930

Year of fee payment: 5

Ref country code: BE

Payment date: 19840930

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19841026

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19841204

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19860919

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19860930

Ref country code: CH

Effective date: 19860930

Ref country code: BE

Effective date: 19860930

BERE Be: lapsed

Owner name: HYDRO-QUEBEC

Effective date: 19860930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19870527

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19870602

GBPC Gb: european patent ceased through non-payment of renewal fee
REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19881118

EUG Se: european patent has lapsed

Ref document number: 80810293.3

Effective date: 19870812