EP0114648B1 - Onload tap-changing transformer - Google Patents

Onload tap-changing transformer Download PDF

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Publication number
EP0114648B1
EP0114648B1 EP19840100454 EP84100454A EP0114648B1 EP 0114648 B1 EP0114648 B1 EP 0114648B1 EP 19840100454 EP19840100454 EP 19840100454 EP 84100454 A EP84100454 A EP 84100454A EP 0114648 B1 EP0114648 B1 EP 0114648B1
Authority
EP
European Patent Office
Prior art keywords
winding
tap
fine
wound
coarse
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
EP19840100454
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0114648A2 (en
EP0114648A3 (en
Inventor
Minoru Hoshi
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP0114648A2 publication Critical patent/EP0114648A2/en
Publication of EP0114648A3 publication Critical patent/EP0114648A3/en
Application granted granted Critical
Publication of EP0114648B1 publication Critical patent/EP0114648B1/en
Expired legal-status Critical Current

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    • 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
    • H01F27/343—Preventing or reducing surge voltages; oscillations
    • 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

Definitions

  • the present invention relates to an onload tap-changing transformer and, more in particular, to an onload tap-changing transformer of the transfer switch type.
  • JP-A-56-94612 in view of which independent claims 1, 7 and 8 have been worded, discloses an onload tap-changing transformer of the transfer switch type which comprises a low-voltage winding and a high-voltage winding wound on an iron core, and a tap winding connected to the high-voltage winding.
  • the tap winding is divided into a coarse tap winding and a fine tap winding.
  • the low-voltage winding is arranged innermost on the core and the high-voltage winding is disposed outside of the low-voltage winding.
  • the coarse tap winding and the fine tap winding are adjacent to the high-voltage winding in that order.
  • the high-voltage winding is connected with the coarse tap winding and the fine tap winding in the manner shown in the wiring diagram of Fig. 1.
  • the low-voltage winding 1 provides a simple connection to terminals u and o.
  • the high-voltage winding 2 on the other hand, has an end thereof connected to a line terminal U, and another end which is connected to the coarse tap winding 3, and also connected through a transfer switch S, was described later, to the fine tap winding 4 having a plurality of tap terminals 13 to 21:
  • the transfer switch S includes a terminal 11 connected to the junction of the high-voltage winding 2 and one end of the coarse tap winding 3, a terminal 12 connected to another end of the coarse tap winding 3, a terminal 13 connected to the line side (higher potential side) end of the fine tap winding 4, and a contactor 5, with an end connected to the terminal 13 for switching between the terminals 11 and 12.
  • An onload tap changer 5 connects selectively one of a plurality of tap terminals 13 to 21 led out of the fine tap winding 4 to another terminal such as a neutral terminal 0 by the switching operation thereof.
  • the fine tap winding 4 is shown in detail in Fig. 2.
  • a predetermine number of turns of the fine tap winding 4 are connected between each adjacent tap terminals.
  • the onload tap changer 5 includes, as well known, tap selectors (not shown) each having a movable contact and stationary contacts which are connected to the tap terminals so that any one of the tap terminals can be connected to the movable contact and a change-over switch (not shown) for selectively connecting one of the movable contacts of the tap selectors to the neutral terminal 0.
  • An object of the present invention is to provide an onload tap-changing transformer in which the transfer voltage and the potential difference between the coarse tap winding and the fine tap winding due to the transfer voltage are reduced, and in which the adverse effect of the transfer voltage in the coarse tap winding and the fine tap winding is eliminated thereby to prevent a corona or a dielectric breakdown.
  • the winding arrangement of an onload tap-changing transformer may be constructed in a manner as shown in any of Figs. 3 to 6.
  • a low-voltage winding and a high-voltage winding 2 are wound in that order from inside on a core C, and a tertiary winding T may be wound as required on the innermost side.
  • the high-voltage winding 2 includes a stack of circular coils with a strand wound in disc. A center terminal connected to the central position of the stack is connected to the line-side terminal U and end terminals connected to upper and lowerterminals thereof, respectively, are connected in together to the neutral point so that the upper and lower parts of the stack are electrically connected in parallel to each other.
  • the upper and lower terminals of the high-voltage winding 2 are connected to respective integrated units each including a coarse tap winding 3 and a fine tap winding 4 so that the respective units are arranged in parallel to each other so as to provide the aforementioned connection through a transfer switch (not shown), and the terminals of the fine tap windings 4 are selectively connected through the tap changer 5 to the neutral terminal 0.
  • the tertiary winding T and the low-voltage winding 1 wound on the core C are arranged in the same manner as in the embodiment of Fig. 3, and the upper and lower halves of the high-voltage winding 2 are electrically connected in parallel to each other, whereas the integral units of coarse tap winding 3 and fine tap winding 4 are located in juxtaposition with and outside (Fig. 4) or inside (Fig. 5) of the upper and lower parts of the high-voltage winding 2, and connected so as to form a parallel connection of the upper and lower winding parts.
  • the embodiment of Fig. 6 includes an integral unit of a coarse tap winding 3 and a fine tap winding 4 which is disposed at the lower side of the high-voltage winding 2 unlike the embodiments of Figs. 3 to 5.
  • the upper end of the high voltage winding 2 is connected to the line-side terminal U and the lower end thereof is connected to the coarse tap winding 3 and the fine tap winding 4 in a similar manner to Fig. 1.
  • FIG. 7 A connection of the coarse tap winding 3 and the fine tap winding 4 according to the present invention is shown in Fig. 7, in which terminals 11, 12 and tap terminals 13 to 21 are identical to those shown in Figs. 1 and 2.
  • the coarse tap winding 3 is wound between the terminals 11 and 12, and the fine tap winding 4 is also wound together with the coarse tap winding 3 between the tap terminals 13 and 21 with tap terminals 14 to 20 being led out from intermediate points thereof.
  • Fig. 8 which is a sectional view of the coarse tap winding and the fine tap winding are designated by the same reference numerals as those in Fig. 7.
  • Numerals 3 1 to 3 48 designate a sectional view of conductors making up the coarse tap winding 3 between the terminal 11 and 12, in which conductors 3, to 3 3 wound in circular form in that order from outside make up a circular coil D i , while conductors 3 4 to 3 6 make up the next circular coil D 2 .
  • the conductor 3 3 of the circular coil D 1 is connected with the conductor 3 4 of the circular coil D 2 , whereby the conductors 3 1 to 3 6 are wound in series.
  • the circular coils D 3 to D 16 are formed with leading and trailing ends of adjacent circular coils connected in series to make up the coarse tap winding wound.
  • Numerals 4 1 to 4 48 designate a sectional view of conductors making up the fine tap winding 4, which conductors are wound in parallel with the conductors of the coarse tap winding 3 of the circular coils D 1 to D 16 .
  • the conductors in each pair of adjacent circular coils of the fine tap windings are connected to provide a series connection, of which the leading and trailing ends are connected to respective external terminals.
  • the external terminal connected to the trailing end of the series connection of each pair provides one of the taps and also is connected to the external terminal connected to the leading terminal of the series connection of the next pair.
  • the fine tap winding 4 is wound in the form of conductors 4 1 to 4 3 from outside to inside in the circular coil D 1 and conductors 4 4 to 4 6 from inside to outside in the circular coil D 2 .
  • the conductors 4 3 and 4 4 are connected to form a series connection of conductors 4 1 to 4 6 with a tap 14 led out of the conductor 4 6 at the trailing end of the series connection of conductors 4 1 to 4 6 .
  • the conductors 4 7 to 4 12 are similarly wound with the next tap 15 led out of the conductor 4 12 at the trailing end thereof.
  • the trailing end conductor 3g of the circular coil D 2 is connected with the leading end conductor 3 7 of the circular coil D 3 .
  • taps 16 to 21 are led out.
  • the coarse tap winding 3 and the fine tap winding 4 are formed integrally with each other unlike the conventional construction in which the coarse and fine tap windings were constructed and arranged as separate components.
  • the integral arrangement of the coarse tap winding 3 and the fine tap winding 4 described above is manufactured in such a manner that the conductors making up the coarse tap winding 3 and the fine tap winding 4 juxtaposed with each other are wound together to make up a circular coil.
  • a selected number of such circular coils are accumulated in a stack extending axial direction and connected to provide electrical connection among predetermined conductors with taps led out appropriately.
  • the conductors making up the coarse tap winding and the conductors making up the fine tap winding are wound together in juxtaposed relation with each other so as to form a circular winding in which the coarse tap winding and the fine tap winding are integrated with each other.
  • the capacitance between the coarse tap winding and the fine tap winding is increased greatly as compared with the conventional arrangement in which the windings are separated from each other.
  • the transfer voltage and the potential difference due to the transfer voltage are reduced, thereby preventing the corona or dielectric breakdown.
  • the insulation distance between the contacts of the onload tap changer can be reduced, it is allowed to reduce the size of the onload tap changer.
  • the integrated arrangement of the windings is effective to reduce the number of working steps and the cost in production.
  • Fig. 9 showing a connection of the coarse tap winding and the fine tap winding in another embodiment of the present invention
  • the coarse tap winding 3 is wound between terminals 11 and 12.
  • the fine tap winding 4 is wound together with the coarse tap winding 3 only in the upper four circular coils and the lower four circular coils, and taps 13 to 21 are led out at predetermined points.
  • Fig. 10 showing a sectional view of the coarse tap winding and the fine tap winding shown in the connection diagram of Fig. 9, the same terminals as those in Fig. 9 are denoted by the same reference numerals.
  • the fine tap winding 4 is divided into upper and lower parts which are wound together with the respective parts of the coarse tap winding 3 wound in the upper four circular coils D 1 to D 4 and the lower four circular coils D 9 to D 12 , respectively.
  • the fine tap winding 4 are wound with the conductors 4,, 4 2 and 4 3 from outside to inside in the circular coil D i , and with the conductors 4 4 , 4 5 , 4 6 , from inside to outside in the circular coil D 2 , and the conductors 4 3 and 4 4 are connected to each other with the tap 14 led out of the conductor 4 6 at the trailing end.
  • the conductors for the next tap are also wound with the circular coils D 1 and D 2 .
  • the conductors 4y to 4 9 for the next tap are wound, in juxtaposed relation with the conductors 4, to 4 3 , from outside to inside in the circular coil D ⁇ , and the conductors 4 10 to 4 12 , in juxtaposed relation with the conductors 4 4 to 4 6 , from inside to outside in the circular coil D 2 .
  • the conductors 4 9 to 4 10 are connected with each other and the tap 15 is led out of the trailing-end conductor 4, 2 .
  • the trailing-end conductor 4 5 of the first-mentioned conductor group is connected with the leading end conductor 4 7 of this conductor group.
  • the integral arrangement of the coarse tap winding 3 and the fine tap winding 4 is made in such a manner that a strand including the conductors making up the coarse tap winding 3 and two strand including the conductors for the two taps of the fine tap winding 4 are wound together in juxtaposed relation with each other, into a circular coil of first type, and a circular coil of second type is formed of a strand including the conductors making up the coarse tap winding 3 alone. Then as shown in Fig. 10, such coils are laid one over the other in axial direction so that selected number of the circular coils of the first type are laid above and under a stack of the circular coils of the second type, and the predetermined conductors are connected with taps led out.
  • the conductors making up the coarse tap winding are arranged in juxtaposition with the conductors for two taps of conductors making up the fine tap windings to form the circular coil of the first type.
  • the circular coils of the first type are arranged to dispose above and below a stack of the circular coils of the second type including the conductors making up the coarse tap windings alone.
  • the coarse and fine tap windings are integrated into a disc-type winding assembly which has the same advantage as the embodiment mentioned above.
  • the conductors covering a pair of taps are wound in juxtaposed relation with each other, so that the necessary number of the circular coils is reduced thereby to reduce the height of the winding assembly. This feature is effectively used in the case where the height of the device is limited for reasons of design or manufacture.
  • the conductors for one tap of the fine tap winding are wound in two circular coils.
  • the present invention is not limited to such a construction and the conductors for one tap of the fine tap winding may be wound in any even number more than 2 of the circular coils.
  • the arrangement of the circular coils is not limited to the one shown in the above-mentioned embodiment but may be determined appropriately.
  • the conductors making up the coarse tap windings are arranged in juxtaposed relation with the conductors making up the fine tap windings and wound into a circular form thereby to make up an integrated disc winding assembly and taps are led out from predetermined points of the fine tap winding, so that the capacitance between the coarse tap winding and the fine tap winding is increased thereby reducing the transfer voltage and the potential difference between the windings due to the transfer voltage and also preventing the corona or dielectric breakdown. Further since the insulation distance between the contacts of the onload tap changer is shortened, a compact onload tap changer is realized. Furthermore, since the coarse and fine tap windings are integrated it is possible to reduce the manufacturing processes and the production cost.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP19840100454 1983-01-22 1984-01-17 Onload tap-changing transformer Expired EP0114648B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8081/83 1983-01-22
JP808183A JPS59134808A (ja) 1983-01-22 1983-01-22 負荷時タツプ切換変圧器

Publications (3)

Publication Number Publication Date
EP0114648A2 EP0114648A2 (en) 1984-08-01
EP0114648A3 EP0114648A3 (en) 1984-08-29
EP0114648B1 true EP0114648B1 (en) 1987-04-22

Family

ID=11683380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840100454 Expired EP0114648B1 (en) 1983-01-22 1984-01-17 Onload tap-changing transformer

Country Status (4)

Country Link
EP (1) EP0114648B1 (enrdf_load_stackoverflow)
JP (1) JPS59134808A (enrdf_load_stackoverflow)
DE (1) DE3463311D1 (enrdf_load_stackoverflow)
IN (1) IN159670B (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150132B1 (en) * 1984-01-24 1988-08-17 Mitsubishi Denki Kabushiki Kaisha On-load tap changer
CA2585608C (en) * 2004-12-22 2014-05-13 Perkinelmer Singapore Pte Ltd. A method and apparatus for analysing a dynamic sample
DE102012203103B4 (de) 2012-02-29 2018-01-11 Siemens Aktiengesellschaft Spannungsumwandlungsvorrichtung und Schienenfahrzeug mit einer Spannungsumwandlungsvorrichtung
CZ307097B6 (cs) * 2014-11-06 2018-01-10 Vysoká Škola Báňská - Technická Univerzita Ostrava Způsob přepínání zátěže u transformátoru a zapojení transformátoru k provádění tohoto způsobu
CN109473262B (zh) * 2018-12-03 2023-11-21 三变科技股份有限公司 双高压变压器及其调压方法
CN113161132A (zh) * 2021-03-11 2021-07-23 云南电网有限责任公司电力科学研究院 一种组合式绕组变压器、调节方法以及数据关系分析方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE576585A (fr) * 1958-03-27 1959-07-01 Acec Disposition particulière d'enroulements pour autotransformateurs.
NL120489C (enrdf_load_stackoverflow) * 1962-11-28
US3621428A (en) * 1970-09-24 1971-11-16 Westinghouse Electric Corp Electrical windings and method of constructing same
DE2841592C2 (de) * 1978-09-25 1982-05-27 Transformatoren Union Ag, 7000 Stuttgart Stufenwicklung für Transformatoren und Drosseln für sehr große Ströme
JPS5923455B2 (ja) * 1978-11-06 1984-06-02 株式会社日立製作所 ３巻線変圧器

Also Published As

Publication number Publication date
DE3463311D1 (en) 1987-05-27
EP0114648A2 (en) 1984-08-01
JPS59134808A (ja) 1984-08-02
EP0114648A3 (en) 1984-08-29
JPH023285B2 (enrdf_load_stackoverflow) 1990-01-23
IN159670B (enrdf_load_stackoverflow) 1987-05-30

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