FR2640076A1 - Current-balancing three-phase/single-phase transformer - Google Patents

Current-balancing three-phase/single-phase transformer Download PDF

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Publication number
FR2640076A1
FR2640076A1 FR8816700A FR8816700A FR2640076A1 FR 2640076 A1 FR2640076 A1 FR 2640076A1 FR 8816700 A FR8816700 A FR 8816700A FR 8816700 A FR8816700 A FR 8816700A FR 2640076 A1 FR2640076 A1 FR 2640076A1
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France
Prior art keywords
phase
current
phases
transformer
neutral
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FR8816700A
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French (fr)
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FR2640076B1 (en
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PITRA LUCIEN
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PITRA LUCIEN
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00Fixed transformers not covered by group H01F19/00
    • H01F30/06Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12Two-phase, three-phase or polyphase transformers
    • H01F30/14Two-phase, three-phase or polyphase transformers for changing the number of phases

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The objective of the invention is to obtain a one-phase alternating voltage from a network or from a three-phase source mounted in star configuration and containing a neutral. This transformer distributes in the primary the current absorbed in the secondary. This is evidenced by a balance of current in the phases of the network as well as by a reduction in current of about 30 % in the phases with respect to what it would be, for the same one-phase power, drawn directly in one phase.

Description

"Transformateur triphasé/monophasé équilibreur d'intensité"
DESCRIPTION DETAILLEE
L'invention a pour objet l'obtention d'une tension alternative monophasée à partir
d'un réseau ou d'une source de courant triphasé montée en étoile et comportant
un neutre.Son but est surtout de neutraliser les inégalités de charge en ligne
en nivelant les intensités dans les trois phases et dans le neutre. Elle ne vise pas un équilibre rigoureux de la puissance. Ce transformateurest remarquable
en trois points
a) En ce qu'il assure une répartition uniforme des intensités absorbées aux
trois phases et au neutre.
"Three-phase / single-phase current balancer transformer"
DETAILED DESCRIPTION
The object of the invention is to obtain a single-phase alternating voltage from
a network or a three-phase current source mounted in a star and comprising
a neutral. Its purpose is above all to neutralize the load inequalities online
by leveling the intensities in the three phases and in the neutral. It does not aim for a rigorous balance of power. This transformer is remarkable
in three points
a) In that it ensures a uniform distribution of the intensities absorbed at
three phases and neutral.

b) En ce que cette réparti Lion des intensité est assurée en un seul bloc - transformateur
c) Le circuit d'utilisation étant indépendant de celui du réseau,se trouve être
isolé de celui-ci.La valeur d'utilisation de la tension peut être définie d'après
le besoin.Le principe de fonctionnement est décrit ci-après;les circuits électriques
et magnétiques sont décrits à titre indicatif et non limitatif en se référant - aux figures 1 et 2 annexées
Ce transformateur se compose de deux circuits magnétiques comportant chacun un
bobinage primaire et un bobinage secondaire.La figure 1 donne la représentation
schématique du transformateur ; la figure 2 donne la représentation graphique
des relstions de phases et d'amplitude des tersons Aecondaires Dars un esprit de synthèse,des repères de phases sont communs a la figure 1 et à la figure 2
Soit,dans la figure l,une source de courant alternatif triphasé comportant
les phases 1- 2 - 3 ainsi qu'un neutre 4,Cette source est reliée aux bobinages
primaires 9 et 1O;;Les bobinages secondaires 11 et 12 sont couplés en série
La somme de heur tension ,recueillie en 5 et 6 aboutit à l'utilisation 8 - Le secondaire 11 traversé par le circuit magnétique 13 le secondaire 12 est traversé par le circuit magnétique 14 . Appelons ( u ) la tension issue du secondaire ( 11 ) et ( u') la tension issue du secondaire ( 12
Les deux tensions ( u ) et ( u') sont décalées de 900 entre-elles.On recueille entre ( 5 ) et ( 6 ) une tension ( U ) hypothénuse telle que Ç t NL2 + yj2 ) - d'où

Figure img00020001
b) In that this Lion intensity distribution is ensured in a single transformer block
c) The circuit of use being independent of that of the network, happens to be
isolated from it The voltage usage value can be set according to
The operating principle is described below; the electrical circuits
and magnetic are described for information and not limitation, with reference to - Figures 1 and 2 attached
This transformer consists of two magnetic circuits each comprising a
primary winding and a secondary winding. Figure 1 gives the representation
schematic of the transformer; figure 2 gives the graphic representation
phase and amplitude relstions of the Aersons tersons In a spirit of synthesis, phase markers are common in Figure 1 and in Figure 2
Or, in Figure l, a three-phase alternating current source comprising
phases 1- 2 - 3 as well as a neutral 4, This source is connected to the windings
primary 9 and 1O ;; secondary windings 11 and 12 are coupled in series
The sum of the voltage hour, collected in 5 and 6 leads to the use 8 - The secondary 11 crossed by the magnetic circuit 13 the secondary 12 is crossed by the magnetic circuit 14. Call (u) the voltage from the secondary (11) and (u ') the voltage from the secondary (12
The two tensions (u) and (u ') are offset by 900 between them. We collect between (5) and (6) a tension (U) hypothénuse such as Ç t NL2 + yj2) - hence
Figure img00020001

Lorsque les deux bobinages ( ll ) et ( 12 ) sont respective -ment calculés de façon à ce que le rapport des tensions ( u ) et ( u') soient:

Figure img00020002
When the two windings (ll) and (12) are respectively calculated so that the ratio of the voltages (u) and (u ') are:
Figure img00020002

La puissance utilisée aux secondaires se répartit d'une façon apparente
dans le même rapport 4 entre les phases ( 1 ) et ( 2 ) d'une part et dans la pisse
( 4 ) ( 3 ) d'autre part. Les intensités sont équilibrées et réparties dans les
trois phases et dans le neutre.La puissance se trouve ainsi répartie , le réseau
se trouve être à la fois équilibré en intensité et moins chargé comparativement
à la même puissance tirée sur une seule phase.Un calcul simple , inutile dans cet
exposé, montre qu'une puissance donnée,tirée sur une seule phase et le neutre
exige une intensité trois fois plus élevée que la même puissance répartie uniformément
sur les trois phases.
The power used in the secondary is distributed in an apparent way
in the same relationship 4 between phases (1) and (2) on the one hand and in the piss
(4) (3) on the other hand. The intensities are balanced and distributed in the
three phases and in the neutral. The power is thus distributed, the network
happens to be both balanced in intensity and less charged comparatively
at the same power drawn on a single phase. A simple calculation, useless in this
exposed, shows that a given power, drawn on a single phase and the neutral
requires three times the intensity of the same power distributed evenly
on the three phases.

La figure ( 2 ) représente , dans la partie gauche
- La grandeur et la direction des phases primaires d'alimentation ( 1-2-3 ) ainsi
que le neutre ( 4
- La résultante ( 5 ) des tensions ( i ) et ( 2 ) déterminée , d'une part avec
le vecteur ( 4-1 ) et d'autre part avec l'inverse ( 4-2bis) du vecteur ( 4-2
- Le point ( 4 ) qui est le neutre primaire est également l'origine d'une projection
s'effectuant vers la droite suivant l'axe ( 4 - 4bis) .A l'extrême droite (4bis)
qui est également un neutre secondaire , sont représentées:
- seulement en directions relatives , les phases ( 1-2-3 - La valeur ( u ) et sa direction qui est la tension du secondaire ( t,
- La valeur ( u') et sa direction qui est la tensiondu secondaire ( 12
- La valeur et la direction de la tension ( U ) d'utilisation, résultante des
tensions ( u ) et ( u') .
The figure (2) represents, on the left side
- The size and direction of the primary feeding phases (1-2-3) as well
that the neutral (4
- The result (5) of the tensions (i) and (2) determined, on the one hand with
the vector (4-1) and on the other hand with the inverse (4-2bis) of the vector (4-2
- The point (4) which is the primary neutral is also the origin of a projection
to the right along the axis (4 - 4bis). To the far right (4bis)
which is also a secondary neutral, are represented:
- only in relative directions, the phases (1-2-3 - The value (u) and its direction which is the secondary voltage (t,
- The value (u ') and its direction which is the secondary voltage (12
- The value and direction of the voltage (U) of use, resulting from
tensions (u) and (u ').

Pour la commodité de l'exposé , on a supposé être mises en phases , les composantes primaires avec celles du secondaire ; ce qui est inexact. Cette relation de phase
étant très variable dans la marge des utilisations comprises entre la marche à
vide et la pleine charge au secondaire. Toutefois , ce fait ne change en rien les
données finales du problème posé. I1 est nécessaire que le rapport des tensions
( u ) et ( u' ) soit égal à #3 àfin d'assurer une absorption convenablement répartie dans les deux primaires ( 9 ) et ( 10 ) de telle sorte que les puissances
absorbées par ces derniers soient dosées dans un rapport similaire. En nous rapportant
à la figure ( 1 ) le calcul de ce transformareur est classique en tenant compte
d'une part , des intensités magnétiques adoptées pour-le fer dans les champs(13)et(ifl
ainsi que des tensions respectives appliquées aux bobinages ( 9 ) et ( 10 ). Il
faut respecter les valeurs relatives des bobines secondaires ( 11 ) et ( 12 )
afin d'obtenir le rapport des tensions indiqué plus haut.....................
For the sake of convenience, we have assumed that the primary components are phased in with those of the secondary; which is incorrect. This phase relationship
being very variable in the range of uses between walking
empty and full load in high school. However, this fact does not change the
final data of the problem posed. It is necessary that the ratio of the tensions
(u) and (u ') is equal to # 3 in order to ensure an absorption suitably distributed in the two primaries (9) and (10) so that the powers
absorbed by them are dosed in a similar ratio. By reporting to us
in figure (1) the calculation of this transformer is classic taking into account
on the one hand, magnetic intensities adopted for iron in fields (13) and (ifl
as well as the respective voltages applied to the windings (9) and (10). he
respect the relative values of the secondary coils (11) and (12)
in order to obtain the voltage ratio indicated above .....................

En définitive , une ultime retouche est nécessaire pour le nombre de spires des
bobinages secondaires , pour neutraliser les faibles divergences subsistant dans
les circuits magnétiques . On obtient alors une judicieuse répartition des puissances ainsi qu'un équilibre rigoureux des intensités dans les trois phases primaires.
Ultimately, a final touch-up is necessary for the number of turns of the
secondary windings, to neutralize the small divergences remaining in
magnetic circuits. We then obtain a judicious distribution of powers as well as a rigorous balance of intensities in the three primary phases.

Claims (1)

REVENDICRTIONCLAIM 1) L'elaboration d'un transformateur statique permettant une uti 1) The development of a static transformer allowing a utility lisation d'un courant monophasé a partir d'un courant triphasé en reading of a single-phase current from a three-phase current in respectant une répartition rigoureuse des intensites en ligne tri respecting a rigorous distribution of online sorting intensities phasee est caracterisée par la definition d'un rapport de tension égal d F entre u et u' des bobinages secondaires Il et 12, par phase is characterized by the definition of an equal voltage ratio d F between u and u 'of the secondary windings Il and 12, by un rapport similaire des bobinages primaires 9 et 10 qui concer a similar ratio of primary windings 9 and 10 which relate to nent l'absorption de l'energie sur le reseau, par la disposition the absorption of energy on the network, by the arrangement symetrique des circuits magnetiques 13 et 14.  symmetrical of the magnetic circuits 13 and 14.
FR8816700A 1988-12-07 1988-12-07 THREE-PHASE TRANSFORMER / MY INTENSITY BALANCER OPHASE Expired - Fee Related FR2640076B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8816700A FR2640076B1 (en) 1988-12-07 1988-12-07 THREE-PHASE TRANSFORMER / MY INTENSITY BALANCER OPHASE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8816700A FR2640076B1 (en) 1988-12-07 1988-12-07 THREE-PHASE TRANSFORMER / MY INTENSITY BALANCER OPHASE

Publications (2)

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FR2640076A1 true FR2640076A1 (en) 1990-06-08
FR2640076B1 FR2640076B1 (en) 1991-05-10

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6084499A (en) * 1996-12-31 2000-07-04 Compaq Computer Corp. Planar magnetics with segregated flux paths
EP1947659A1 (en) * 2007-01-17 2008-07-23 ABB Technology AG Compact power transformer in V-V for electrical traction

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR486755A (en) * 1917-09-12 1918-05-08 Louis Bardon Static converter of two and three-phase current to single-phase current of the same frequency
FR492523A (en) * 1917-10-08 1919-07-10 Humberto Magini Device for a suitable cyclic distribution of a single-phase load on the phases of a polyphase supply circuit
US3129377A (en) * 1960-11-14 1964-04-14 Westinghouse Electric Corp Transformer for connecting a threephase system to a two-phase system
FR1386319A (en) * 1963-11-15 1965-01-22 Electric transformer
DE1638874A1 (en) * 1967-09-07 1970-08-27 Strobel Dipl Ing Christian Phase number converter 3: 1

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR486755A (en) * 1917-09-12 1918-05-08 Louis Bardon Static converter of two and three-phase current to single-phase current of the same frequency
FR492523A (en) * 1917-10-08 1919-07-10 Humberto Magini Device for a suitable cyclic distribution of a single-phase load on the phases of a polyphase supply circuit
US3129377A (en) * 1960-11-14 1964-04-14 Westinghouse Electric Corp Transformer for connecting a threephase system to a two-phase system
FR1386319A (en) * 1963-11-15 1965-01-22 Electric transformer
DE1638874A1 (en) * 1967-09-07 1970-08-27 Strobel Dipl Ing Christian Phase number converter 3: 1

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6084499A (en) * 1996-12-31 2000-07-04 Compaq Computer Corp. Planar magnetics with segregated flux paths
EP1947659A1 (en) * 2007-01-17 2008-07-23 ABB Technology AG Compact power transformer in V-V for electrical traction

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FR2640076B1 (en) 1991-05-10

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