WO2014098272A1 - Bobine à basse tension de transformateur et transformateur - Google Patents

Bobine à basse tension de transformateur et transformateur Download PDF

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Publication number
WO2014098272A1
WO2014098272A1 PCT/KR2012/011017 KR2012011017W WO2014098272A1 WO 2014098272 A1 WO2014098272 A1 WO 2014098272A1 KR 2012011017 W KR2012011017 W KR 2012011017W WO 2014098272 A1 WO2014098272 A1 WO 2014098272A1
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WO
WIPO (PCT)
Prior art keywords
voltage coil
low voltage
transformer
coil
high voltage
Prior art date
Application number
PCT/KR2012/011017
Other languages
English (en)
Inventor
Seung-Chul Lee
Jong-Yun Lim
Chang-Hyeon Lee
Original Assignee
Abb Technology 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 Abb Technology Ltd filed Critical Abb Technology Ltd
Priority to PCT/KR2012/011017 priority Critical patent/WO2014098272A1/fr
Publication of WO2014098272A1 publication Critical patent/WO2014098272A1/fr

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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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2847—Sheets; Strips
    • H01F27/2852—Construction of conductive connections, of leads
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • H01F2027/328—Dry-type transformer with encapsulated foil winding, e.g. windings coaxially arranged on core legs with spacers for cooling and with three phases

Definitions

  • the present invention relates generally to the field of transformer technology, and in particular, relates to a low voltage coil of a transformer and also to a transformer, especially a triangular transformer using such a low voltage coil.
  • Triangular core transformers have many benefits such as lower losses, reduced noise level, lower weight, smaller inrush current, smaller foot print, more manageable external magnetic radiation field and lower third harmonics in a three-phase distribution system.
  • triangular cores for three-phase distribution transformers 100 typically consist of three core frames 101, which are essentially a group of one or more loops of magnetic steel or a similar, low magnetic reluctance material.
  • the core frames are fit together such that when viewed from above, the core takes the form of a triangle.
  • Each phase of the transformer fits on a single core leg, through which two of the loops pass through.
  • the triangular cores are located in a low voltage coil 102.
  • the low voltage coil 102 is located in a high voltage coil 103 with an air gap between them. The air gap is for electrical strength.
  • the low voltage coil 102 needs two lead bars 111, 112 for further connection to its both ends.
  • the both lead bars 111, 112 are located together as show in FIG. 1 and FIG. 2a and FIG. 2b. That means both lead bars are located at the same place on the perpendicular direction of the low voltage core axis 119.
  • low voltage coil outer diameter should be increased by low voltage lead bars 111, 112.
  • the low voltage coil thickness 120 is calculated by the thickest part. See FIG. 2a, that is the two-lead bar part. It increases additional High-Low air clearance.
  • One of the objectives of the embodiments of the present invention is to provide a transformer low voltage coil, which at least minimizes the low voltage coil and consequently minimizes the core of the transformer and saves the cost.
  • a transformer low voltage coil comprising a low voltage coil and at least two lead bars and said at least two lead bars are located separately in a way that the projection towards the redial direction of each of the at least two lead bars on the internal surface of the low voltage coil are non-overlapped.
  • the transformer low voltage coil further comprises a triangular core.
  • the transformer low voltage is dry type. Said low voltage coil is located in a high voltage coil, and the high voltage coil further comprises a connection support for delta connection or Y connection.
  • each end of said low voltage coil and high voltage coil are fixed by three coil blocks. Comparing with using four coil blocks in the prior art, this can also save cost. By reducing one block in the center position of the delta core transformer, the heat dissipating efficiency is highly increased.
  • a triangular core transformer In another aspect of the present invention, there is provided a triangular core transformer. It comprises a triangular core, a low voltage coil and a high voltage coil, wherein the low voltage coil further comprises two lead bars which are located separately in perpendicular direction to the axial of the low voltage coil.
  • each end of said low voltage coil and the high voltage coil are fixed by three coil blocks.
  • the high voltage coil further comprises a high voltage connection support for delta connection or Y connection.
  • the high voltage coil is made by foil disc winding.
  • the high voltage coil is made by horizontally casting a high voltage coil disc winding.
  • FIG. 1 is a triangular core transformer with a prior low voltage coil
  • FIG. 2a is a sectional view of a prior low voltage coil
  • Fig. 2b is a sectional view of a prior low voltage coil with a triangular core
  • FIG. 3a is a sectional view of a low voltage coil according to a preferred embodiment of the present invention
  • Fig. 3b is a sectional view of a low voltage coil with triangular core according to a preferred embodiment of the present invention
  • FIGs. 4a-4b show the longest semi-diameter comparison between the a prior low voltage coil and a low voltage coil according to a preferred embodiment of the present invention
  • FIGs. 4c-4d show the triangular core length comparison and the High-Low gap comparison between the a prior low voltage coil and a low voltage coil according to a preferred embodiment of the present invention
  • FIG. 5 is a perspective view of a triangular core transformer with a low voltage coil according to the present invention and only three coil blocks;
  • FIG.6 is a front view of a triangular core transformer with a low voltage coil of the present invention and a high voltage connection support.
  • the present invention will be described in more details by a triangular transformer, but the design and the improvement according to the present invention is applicable to all types of transformers.
  • FIG. 1 shows structure of a triangular core transformer.
  • the triangular cores are located in a low voltage coil 102.
  • the low voltage coil 102 is located in a high voltage coil 103 with an air gap between them.
  • the low voltage coil outer diameter is increased by low voltage lead bars 111, 112. See FIG. 2a, the low voltage coil thickness 120 is calculated by the thickest part.
  • the transformer low voltage coil comprises a low voltage coil 102 and at least two lead bars 211, 212, wherein said at least two lead bars 211, 212 are located separately in a way that the projection towards the radial direction 118 of each of the at least two lead bars 211, 212 on the internal surface of the low voltage coil 102 are non-overlapped.
  • the radial direction 118 means a direction perpendicular to and towards the axial 119 of the low voltage coil 102. See FIGs. 2a and 3a.
  • the two lead bars 211, 212 are preferred to be separated in an angle of 90°-120° to the axial 119 of the low voltage coil.
  • the separated angle is not limited to above scope.
  • the preferred angle of 90°-120° is easy for assembling. But any angle which can separate the two lead bars 211, 212 in perpendicular direction 118 to the axial 119 of the low voltage coil is applicable.
  • the prior thickest part 120 By separating two lead bars 211, 212 in perpendicular direction 118 to the axial 119, the prior thickest part 120, as shown in FIG. 2a, can be reduced to the thickest part 220 according to the present invention.
  • the thickest part of the low voltage coil can reduce from a thickness of a lead bar 211 or 212. See FIG. 3a.
  • the high voltage coil can reduce a semi-diameter of the thickness of a lead bar 211 or 212, and each frame of the delta core 101 can reduce a length of twice thickness of a lead bar 211 or 212.
  • FIG. 4a shows the comparison between the prior transformer low voltage coil and the transformer low voltage coil of the present invention.
  • a triangular transformer of 1MVA, 22.9kV/0.38kV as example, all distances in FIG. 4a and FIG. 4b are shown in the following chart.
  • the dimension of a lead bar is 100mm in length and 12mm in thickness.
  • the longest distance D11 for Bended & Trimmed Bar or Bended & non-Trimmed Bar are both 183 mm.
  • the longest distance D13 for Flat & non-Trimmed Bar is 189 mm.
  • the distance of D12 is 177mm, D14 is 159mm.
  • the longest distance D21 for Bended & Trimmed Bar or Bended & non-Trimmed Bar are both 171 mm.
  • the longest distance D23 for Flat & non-Trimmed Bar is 179 mm.
  • the distance of D22 is 165mm, D24 is 178mm.
  • a thickness of 12mm can be saved by separating the two lead bars in the perpendicular direction 118 to the axial 119 of the low voltage coil.
  • the perpendicular direction 118 to the axial 119 of the low voltage coil means a direction on the section view and towards the center of the low voltage coil.
  • the saved thickness is exactly the thickness of a lead bar.
  • the saved thickness looks not tremendous. However, it can save a big mount of cost. See FIG. 4c and FIG. 4d, by separating the two lead bars in the perpendicular direction 118 to the axial 119 of the low voltage coil, the prior longest diameter D33 of the low voltage coil is reduced to the present longest diameter D43.
  • D33 is 340mm and D43 is 328mm. If we maintain the diameter D32 of the low voltage coil and the diameter D31 high voltage coil the same in the present invention with the prior transformers.
  • the High-Low coil gap is increased from D34 i.e. 25mm to D44 i.e. 38mm.
  • D31 is 530mm and D32 is 220mm.
  • the cores are always quite huge ones. And as the coppers, silicon steel and other materials for manufacturing the cores, the high voltage coil and the low voltage coils are very expensive. Thus, even saving the diameter of the cores, the high voltage coil and the low voltage coils in millimeters, the cost saving is a big amount.
  • a triangular core transformer comprising a low voltage coil 102 of the present invention as described above is provided.
  • the low voltage coil 102 comprises two lead bars 211, 212 which are located separately in perpendicular direction 118 to the axial 119 of the low voltage coil. As shown in FIG. 3a, FIG. 3b.
  • the transformer is a triangular core transformer, in particular it is dry type one.
  • the present invention is applicable to all types of transformers and not limited to dry transformer or triangular core transformer.
  • each end of said low voltage coil 102 and high voltage coil 103 are fixed by three coil blocks. Comparing with using four coil blocks in the prior art, this can also save cost. By reducing one block in the center position of the delta core transformer, the heat dissipating efficiency is highly increased.
  • the low voltage coil 102 is located in a high voltage coil 103, and the high voltage coil 103 further comprising a connection support 109 for delta connection or Y connection.
  • the connection support 109 makes the high voltage coil 103 easy for delta connection or Y connection.
  • the high voltage coil 103 is made by foil disc winding.
  • the high voltage foil 103 is made by horizontally casting a high voltage coil disc winding.

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

Abstract

La présente invention concerne une bobine à basse tension de transformateur qui réduit la taille de la bobine à basse tension et réduit par conséquent la taille du noyau du transformateur et permet d'économiser des coûts. La bobine à basse tension de transformateur comprend une bobine à basse tension et au moins deux barres en plomb et lesdites au moins deux barres en plomb (211, 212) sont positionnées séparément de telle sorte que les projections dans le sens radial (118) de chacune des au moins deux barres en plomb (211, 212) sur la surface interne de la bobine à basse tension (102) ne se chevauchent pas. La présente invention concerne également un transformateur à noyau triangulaire employant une telle bobine à basse tension. La bobine à haute tension comprend en outre un support de connexion pour un branchement en triangle ou un branchement en étoile. Chaque extrémité de ladite bobine à basse tension et de la bobine à haute tension est fixée par trois blocs de bobine.
PCT/KR2012/011017 2012-12-17 2012-12-17 Bobine à basse tension de transformateur et transformateur WO2014098272A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2012/011017 WO2014098272A1 (fr) 2012-12-17 2012-12-17 Bobine à basse tension de transformateur et transformateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2012/011017 WO2014098272A1 (fr) 2012-12-17 2012-12-17 Bobine à basse tension de transformateur et transformateur

Publications (1)

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WO2014098272A1 true WO2014098272A1 (fr) 2014-06-26

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105161262A (zh) * 2015-07-07 2015-12-16 广东广特电气有限公司 一种立体卷铁心变压器的低压y引线结构
WO2018176869A1 (fr) * 2017-04-01 2018-10-04 海鸿电气有限公司 Nouvelle structure conductrice basse tension de noyau enroulé tridimensionnel de transformateur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003270272A (ja) * 2002-03-20 2003-09-25 Mitsubishi Electric Corp 電流測定器
JP2009064941A (ja) * 2007-09-06 2009-03-26 Nichicon Corp 三相乾式変圧器
US20110156851A1 (en) * 2008-08-25 2011-06-30 Seiden Mfg. Co., Ltd. Three-Phase High Frequency Transformer
EP2367181A1 (fr) * 2010-03-20 2011-09-21 ABB Technology AG Transformateur de type sec à haute performance et triphasées avec bobines isolées d'époxy et son procédé de fabrication
US20120169450A1 (en) * 2009-08-19 2012-07-05 Abb Technology Ag Lead-out tube

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003270272A (ja) * 2002-03-20 2003-09-25 Mitsubishi Electric Corp 電流測定器
JP2009064941A (ja) * 2007-09-06 2009-03-26 Nichicon Corp 三相乾式変圧器
US20110156851A1 (en) * 2008-08-25 2011-06-30 Seiden Mfg. Co., Ltd. Three-Phase High Frequency Transformer
US20120169450A1 (en) * 2009-08-19 2012-07-05 Abb Technology Ag Lead-out tube
EP2367181A1 (fr) * 2010-03-20 2011-09-21 ABB Technology AG Transformateur de type sec à haute performance et triphasées avec bobines isolées d'époxy et son procédé de fabrication

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105161262A (zh) * 2015-07-07 2015-12-16 广东广特电气有限公司 一种立体卷铁心变压器的低压y引线结构
WO2018176869A1 (fr) * 2017-04-01 2018-10-04 海鸿电气有限公司 Nouvelle structure conductrice basse tension de noyau enroulé tridimensionnel de transformateur
US11315722B2 (en) 2017-04-01 2022-04-26 Haihong Electric Co., Ltd. Low-voltage lead structure for three-dimensional wound core of transformer

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