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EP3664108B1 - Appareil électrique à induction statique - Google Patents

Appareil électrique à induction statique Download PDF

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Publication number
EP3664108B1
EP3664108B1 EP19770905.8A EP19770905A EP3664108B1 EP 3664108 B1 EP3664108 B1 EP 3664108B1 EP 19770905 A EP19770905 A EP 19770905A EP 3664108 B1 EP3664108 B1 EP 3664108B1
Authority
EP
European Patent Office
Prior art keywords
winding
tertiary
divided
impedance
lta
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.)
Active
Application number
EP19770905.8A
Other languages
German (de)
English (en)
Other versions
EP3664108A1 (fr
EP3664108A4 (fr
Inventor
Mototaka Sato
Manabu Saijo
Haruhiko Shinonaga
Kazuhiro Muto
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
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Publication date
Application filed by Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Publication of EP3664108A1 publication Critical patent/EP3664108A1/fr
Publication of EP3664108A4 publication Critical patent/EP3664108A4/fr
Application granted granted Critical
Publication of EP3664108B1 publication Critical patent/EP3664108B1/fr
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Anticipated expiration legal-status Critical

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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
    • H01F30/02—Auto-transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings
    • 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
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • 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
    • H01F30/10—Single-phase transformers
    • 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
    • H01F30/12—Two-phase, three-phase or polyphase transformers

Definitions

  • the present invention relates to a stationary induction electric apparatus including a tertiary winding for use in aluminum refining and the like.
  • a single-phase autotransformer including a single-phase three-legged iron core consisting of a main leg and two side legs, in which divided common windings and series windings are arranged on the main leg and on one of the side legs, a tap winding is connected in series to the series windings or the common windings, and a tertiary winding is arranged between the main leg and one of the common windings (for example, see PTL 1).
  • JP S62 257711 A discloses a transformer with a first ternary winding, a primary winding, a second ternary winding, a tap winding and secondary winding.
  • JP S61 46116 A discloses a transformer with a relay device for a transformer.
  • the present invention has been made in view of the problem of the conventional technology, and it is an object of the present invention to provide a stationary induction electric apparatus capable of reducing inductance of a tertiary winding to near zero.
  • a stationary induction electric apparatus is a stationary induction electric apparatus according to claim 1, including a common winding, a series winding, and a tertiary winding arranged on a main leg iron core, in which the tertiary winding is divided, and one of divided tertiary windings is arranged between the common winding and the series winding.
  • a three-phase three-legged autotransformer includes the stationary induction electric apparatus including the above structure.
  • the tertiary winding is divided, and one of divided tertiary windings is arranged between the common winding and the series winding, whereby separation impedance of the tertiary winding can be reduced to near zero.
  • the separation impedance of the three-phase tertiary winding can be reduced.
  • the stationary induction electric apparatus is formed by a three-phase three-legged autotransformer.
  • a three-legged iron core 11 As illustrated in FIG. 1 , in a three-phase three-legged autotransformer 10, a three-legged iron core 11, a U-phase winding 12U, a V-phase winding 12V, and a W-phase winding 12W, respectively, are wound on a U-phase main leg iron core 11U, a V-phase main leg iron core 11V, and a W-phase main leg iron core 11W of the three-legged iron core 11.
  • the U-phase winding 12U, the V-phase winding 12V, and the W-phase winding 12W have the same structure, and thus, as a representative thereof, the U-phase winding 12U will be described below.
  • the U-phase winding 12U includes one divided tertiary winding LTb of a tertiary winding LT divided into two, a common winding LC, a tap winding Ltap, an other divided tertiary winding LTa of the tertiary winding LT, and a series winding LS that are coaxially arranged in this order outwardly on the main leg iron core 11U.
  • connections of the respective windings are made such that a three-phase AC U-phase primary side terminal U is connected to one end of the series winding LS, the other end of the series winding LS is connected to one end of the common winding LC, and the other end of the common winding LC is connected to a middle point O of a star connection via the tap winding Ltap.
  • the tap winding Ltap is provided with an unillustrated tap selector, and a tap selected by the tap selector is connected to a U-phase secondary side terminal u.
  • one end of the divided tertiary winding LTa of the tertiary winding LT is connected to a terminal a
  • the other end of the divided tertiary winding LTa is connected to one end of the divided tertiary winding LTb of the tertiary winding LT
  • the other end of the divided tertiary winding LTb is connected to a terminal b.
  • the divided tertiary windings Lta and LTb are connected in series between the terminals a and b.
  • the divided tertiary winding LTa, the common winding LC, the tap winding Ltap, the divided tertiary winding LTb, and the series winding LS are arranged on the main leg iron core in this order.
  • the divided tertiary windings LTa and LTb are connected in series between terminals b and c
  • the divided tertiary windings LTa and LTb are connected in series between the terminals c and a. Accordingly, the tertiary windings LT of the U-phase, the V-phase, and the W-phase are delta-connected.
  • the autotransformer is structured such that the two divided tertiary windings LTa and divided tertiary windings LTb formed by dividing the tertiary winding LT into two are connected in series, in which the one divided tertiary winding LTa is arranged between the common winding LC and the series winding LS, and the other divided tertiary winding LTb is arranged between the common winding LC and the main leg iron core 11.
  • separation impedance (%Zt) of the entire tertiary winding LT can be set to substantially zero.
  • the separation impedance (%Zt) of the tertiary winding LT can be set to substantially zero by setting the number of turns of each of the divided tertiary windings LTa and LTb to be, for example, 50% when the number of turns of the entire tertiary winding LT is 100%.
  • the separation impedance (% Zt) of the tertiary winding LT can be set to substantially zero, as described above, with reference to a separate winding transformer 20 illustrated in FIG. 3 .
  • a primary winding L1, a tertiary winding L3, a secondary winding L2, and a tap winding Ltap are coaxially arranged in this order on a main leg iron core 21, as illustrated in FIG. 3 .
  • the primary winding L1 is separated from the primary winding L2.
  • the separation impedance (%Z) of the tertiary winding L3 can be set to substantially zero by arranging the tertiary winding L3 in the intermediate position between the primary winding L1 and the secondary winding L2.
  • the separation impedance (% Z) of each winding is represented by %Z ⁇ n 2 ⁇ L, where n represents the number of turns, and L represents inter-winding distance, that is, the separation impedance (%Z) is proportional to the product of the square of the number n of turns and the inter-winding distance L.
  • the numbers n of turns of the primary winding L1, the secondary winding L2, and the tertiary winding L3 are set equal, and also an inter-winding distance L13 between the primary winding L1 and the tertiary winding L3 and an inter-winding distance L32 between the tertiary winding L3 and the secondary winding L2 are set equal.
  • a primary winding-to-tertiary winding impedance is %Z13
  • a tertiary winding-to-secondary winding impedance is %Z32
  • the leakage magnetic flux distribution of the separate winding transformer 20 has a trapezoidal shape with a long top side between the primary winding L1 and the secondary winding L2, and has a trapezoidal shape with a short top side between the primary winding L1 and the tertiary winding L3 and between the tertiary winding L3 and the secondary winding L2.
  • the impedance %Z3 of the tertiary winding L3 can be made substantially zero by merely arranging the tertiary winding L3 between the primary winding L1 and the secondary winding L2.
  • the relationship between inter-winding impedance and tap position in this case is such that while the primary winding-to-secondary winding impedance and the secondary winding-to-tertiary winding impedance are both reduced as the tap number decreases from the maximum tap number, the tertiary winding-to-secondary winding impedance has substantially a constant value regardless of the tap number.
  • the separation impedance of the primary winding L1 is about 12%, which is constant, and the separation impedance of the secondary winding L2 is irregularly reduced from 12% as the tap number decreases from the maximum tap number.
  • the separation impedance of the tertiary winding L3 is maintained constant at about 2%, which is near zero, regardless of the tap number.
  • the primary winding is formed by a part of the series winding LS and a part of the common winding LC, and the common winding LC forms the secondary winding.
  • the primary winding is formed by a part of the series winding LS and a part of the common winding LC, and the secondary winding is formed by the common winding LC.
  • the tertiary winding LT is divided into two to form the divided tertiary windings LTa and LTb.
  • the one divided tertiary winding LTa is arranged between the common winding LC and the series winding LS, and the other divided tertiary winding LTb is arranged between the common winding LC and the main leg iron core 11, whereby the impedance %Z3 of the tertiary winding LT can be set to substantially zero.
  • this autotransformer has a trapezoidal shape with a wide top side between the common winding LC and the series winding LS corresponding to between the primary winding and secondary winding of the separate winding transformer, the magnetic flux distribution thereof corresponding to between the primary winding and the tertiary winding becomes negative in the divided tertiary winding LTb, and has a fluctuation waveform whose peaks are appearing in positions of the tap winding Ltap and the series winding LS between the common winding LC and the series winding LS.
  • the leakage magnetic flux distribution thereof corresponding to between the secondary winding and the tertiary winding becomes negative in the divided tertiary winding LTb, has a positive peak in the position of the common winding LC, and then is reduced to become negative again in the divided tertiary winding LTa, resulting in a fluctuation waveform.
  • the leakage magnetic flux distribution exhibits irregularity.
  • inter-winding impedances respectively corresponding to impedance between the primary winding and the secondary winding and impedance between the secondary winding and the tertiary winding gently increase in sawtooth waveforms as the tap number decreases, whereas impedance between the tertiary winding and the primary winding is constant at about 15%, as illustrated in FIG. 6A .
  • the separation impedance (%Z1) corresponding to the primary winding L1 gently increases as the tap number decreases, whereas the separation impedance (%Z2) corresponding to the secondary winding L2 increases while fluctuating in a sawtooth waveform.
  • the separation impedance (%Zt) of the tertiary winding LT corresponding to the tertiary winding L3 gently decreases as the tap number decreases from 2.5% at the maximum tap number, and can be substantially zero when the tap number becomes half or less.
  • the separation impedance %Zt of the tertiary winding LT can be adjusted in accordance with the number of turns of the entire tertiary winding LT and the individual numbers of turns of the divided tertiary windings LTa and LTb.
  • the tertiary separation impedance (%Zt) of the tertiary winding LT can be finely adjusted by making the numbers of turns of the divided tertiary windings LTa and LTb different.
  • an extreme difference between the numbers of turns of the divided tertiary windings LTa and LTb causes a loss of balance, which affects the reduction of the tertiary separation impedance (%Zt).
  • the maximum range of difference between the numbers of turns of the divided tertiary windings LTa and LTb is preferably about 60% to 40%.
  • setting of the tertiary separation impedance (%Zt) of the tertiary winding LT to substantially zero is not limited to being determined by only the numbers of turns of the divided tertiary windings LTa and LTb.
  • the tertiary separation impedance (%Zt) may be controlled by setting the numbers of turns so that the tertiary separation impedance of the tertiary winding LT becomes negative and connecting a current limiting reactor to the tertiary winding LT.
  • one of the divided tertiary windings LTa and LTb obtained by dividing the tertiary winding LT into two is arranged between the common winding LC and the series winding LS, and the other one thereof is arranged between the common winding LC and the main leg iron core 11, whereby the tertiary impedance of the entire tertiary winding LT can be set to substantially zero.
  • the tertiary separation impedance can be adjusted not only in the case of setting the ratio between the numbers of turns of the divided tertiary windings LTa and LTb to 50%, which is equal to each other, but also in the case of setting the numbers of turns thereof different, so that great flexibly in setting the tertiary separation impedance can be provided.
  • the series winding LS can be arranged on the inner side, and the common winding LC can be arranged on the outer side.
  • the invention is not limited thereto, and the divided tertiary windings LTa and LTb can be connected in parallel. In this case, it is necessary to equalize the numbers of turns of the divided tertiary windings LTa and LTb. Additionally, since the tertiary currents are in parallel, currents flowing through the divided tertiary windings LTa and LTb may be set to half of a value in the case of series connection, and the numbers of turns thereof may be set to a value twice that in the case of series connection. However, when connecting the divided tertiary windings LTa and LTb in parallel, it is necessary to be careful not to cause current imbalance.
  • the present invention is not limited to the above structure. As illustrated by a dotted line in FIG. 2 , reversing the winding direction of the divided tertiary winding LTb allows for wiring from the divided tertiary winding LTa to the divided tertiary winding LTb by passing under the tap winding Ltap and the common winding LC.
  • the tap winding Ltap may be arranged between the common winding LC and the divided tertiary winging LTa.
  • the tap winding Ltap may be divided into two and arranged inside and outside the common winding LC.
  • the divided tap windings Ltap may be connected either in series or in parallel. However, in the case of parallel connection, it is necessary to be careful not to cause current imbalance.
  • a side leg iron core may be provided in addition to a main leg iron core, and a tap winding together with an excitation winding may be arranged on the side leg iron core.
  • the tap winding may be one or may be divided.
  • the present invention is not limited thereto.
  • the present invention is also applicable to a three-phase five-legged autotransformer and a single-phase three-legged autotransformer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Claims (6)

  1. Appareil électrique à induction stationnaire, dans lequel l'appareil électrique à induction stationnaire, dans lequel l'appareil électrique à induction stationnaire est un autotransformateur, l'appareil comprenant un enroulement commun (LC), un enroulement en série (LS), et un enroulement tertiaire (LT) agencés sur un noyau de fer de patte principale (11U),
    dans lequel l'enroulement tertiaire (LT) est divisé, et un premier enroulement tertiaire divisé (LTa) de l'enroulement tertiaire (LT) est agencé entre l'enroulement commun (LC) et l'enroulement en série (LS),
    dans lequel l'appareil électrique à induction stationnaire est caractérisé en ce qu'un second enroulement tertiaire divisé (LTb) de l'enroulement tertiaire (LT), l'enroulement commun (LC), le premier enroulement tertiaire divisé (LTa) de l'enroulement tertiaire (LT) et l'enroulement en série (LS) sont agencés de manière coaxiale dans cet ordre vers l'extérieur sur le noyau de fer de patte principale (11U).
  2. Appareil électrique à induction stationnaire selon la revendication 1, dans lequel l'enroulement tertiaire (LT) est divisé en deux.
  3. Appareil électrique à induction stationnaire selon la revendication 1 ou 2, dans lequel les enroulements tertiaires divisés (LTa, LTb) sont connectés en série.
  4. Appareil électrique à induction stationnaire selon la revendication 1 ou 2, dans lequel les enroulements tertiaires divisés (LTa, LTb) sont connectés en parallèle.
  5. Appareil électrique à induction stationnaire selon l'une quelconque des revendications 1 à 4, dans lequel un nombre de spires de chacun des enroulements tertiaires divisés (LTa, LTb) est agencé de telle sorte qu'une impédance en court-circuit de l'enroulement tertiaire (LT) est définie à zéro.
  6. Appareil électrique à induction stationnaire selon l'une quelconque des revendications 1 à 5, dans lequel un enroulement de prise (Ltap) est agencé entre l'enroulement commun (LC) et l'un des enroulements tertiaires divisés (LTa, LTb).
EP19770905.8A 2018-03-19 2019-03-06 Appareil électrique à induction statique Active EP3664108B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018051673 2018-03-19
PCT/JP2019/008957 WO2019181520A1 (fr) 2018-03-19 2019-03-06 Appareil électrique à induction statique

Publications (3)

Publication Number Publication Date
EP3664108A1 EP3664108A1 (fr) 2020-06-10
EP3664108A4 EP3664108A4 (fr) 2020-12-09
EP3664108B1 true EP3664108B1 (fr) 2021-11-10

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Application Number Title Priority Date Filing Date
EP19770905.8A Active EP3664108B1 (fr) 2018-03-19 2019-03-06 Appareil électrique à induction statique

Country Status (3)

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EP (1) EP3664108B1 (fr)
JP (1) JP6825745B2 (fr)
WO (1) WO2019181520A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7575896B2 (ja) * 2020-08-27 2024-10-30 川崎重工業株式会社 変圧器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6028371B2 (ja) * 1978-07-31 1985-07-04 株式会社東芝 変圧器
JPS58184826U (ja) * 1982-06-02 1983-12-08 富士電機株式会社 高インピ−ダンス多巻線変圧器
JPS6146116A (ja) * 1984-08-09 1986-03-06 株式会社日立製作所 変圧器保護継電装置
JPH067531B2 (ja) * 1986-04-30 1994-01-26 富士電機株式会社 三巻線変圧器の巻線配置
JPH0644538B2 (ja) * 1986-05-29 1994-06-08 株式会社日立製作所 単巻変圧器
JPS63124725U (fr) * 1987-02-04 1988-08-15
JPH05159948A (ja) 1991-10-08 1993-06-25 Fuji Electric Co Ltd 負荷時タップ切換単相単巻変圧器

Also Published As

Publication number Publication date
JP6825745B2 (ja) 2021-02-03
WO2019181520A1 (fr) 2019-09-26
EP3664108A1 (fr) 2020-06-10
EP3664108A4 (fr) 2020-12-09
JPWO2019181520A1 (ja) 2020-10-08

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