WO2022091447A1 - Transformateur moulé - Google Patents

Transformateur moulé Download PDF

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Publication number
WO2022091447A1
WO2022091447A1 PCT/JP2021/009918 JP2021009918W WO2022091447A1 WO 2022091447 A1 WO2022091447 A1 WO 2022091447A1 JP 2021009918 W JP2021009918 W JP 2021009918W WO 2022091447 A1 WO2022091447 A1 WO 2022091447A1
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WO
WIPO (PCT)
Prior art keywords
winding
mold resin
windings
outside
primary winding
Prior art date
Application number
PCT/JP2021/009918
Other languages
English (en)
Japanese (ja)
Inventor
浩司 三本
俊明 高橋
純一 五百川
大毅 関谷
孝平 佐藤
敦 鈴木
Original Assignee
株式会社日立産機システム
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 株式会社日立産機システム filed Critical 株式会社日立産機システム
Publication of WO2022091447A1 publication Critical patent/WO2022091447A1/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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings

Definitions

  • the present invention relates to a mold transformer with improved impulsion resistance.
  • transformer there is a molded transformer in which the winding inside the transformer is impregnated with resin and the outside of the winding is covered with resin.
  • the molded transformer does not use insulating oil for cooling and is covered with flame-retardant resin, so there is less risk of fire, and since there is no need for a tank to hold insulating oil, it is a compact and lightweight transformer. It can be a vessel.
  • Patent Document 1 states that "improving the potential distribution in the winding against an intrusion lightning surge, reducing the shared voltage in the section near the line end, and locally The electric field strength is lowered, the insulation characteristics are excellent, the high space factor of the winding is achieved, the material used is not expensive, and the winding of the static induction electric machine with excellent workability is obtained. The electric field strength is most concentrated.
  • the high cell cap winding where the strands that generate the maximum potential difference between the sections are arranged second from the inside in order to achieve the purpose of electric field relaxation on the inner circumference side of the winding near the line end, which is the weak point of the winding.
  • the method of the lightning impulse withstand voltage test of the transformer is defined in JEC-0301 (static induction device impulse withstand voltage test). For example, a voltage having a waveform similar to the lightning impulse voltage of 60,000 V is wound at high voltage. In addition, observe whether insulation breakdown occurs.
  • a three-phase tripod type molded transformer two inner cores are juxtaposed and outer cores are arranged so as to surround the two inner cores to form a tripod core, and each of the three core legs is molded.
  • a secondary winding (low pressure winding) covered with resin is arranged, and a primary winding (high pressure winding) covered with mold resin is arranged outside the secondary winding (low pressure winding) to form a transformer.
  • a primary winding high pressure winding
  • mold resin low pressure winding
  • the high cell cap winding in order to achieve electric field relaxation on the inner peripheral side of the winding near the line end, the high cell cap winding has a substantially strand shape between the innermost strand and the second strand from the inside. Highly elastic plastic spacing pieces formed in the shape of the primary winding are inserted, and prevention of dielectric breakdown at the outer end of the primary winding is not considered, and the winding method is complicated. Workability is not considered.
  • An object of the present invention is to provide a molded transformer having improved impulse resistance by a simple winding method by improving the winding structure of the primary winding.
  • the primary winding has a number of windings in the radial direction of the windings on both upper and lower ends, which is smaller than the number of windings in the radial direction of the winding in the central portion.
  • the thickness of the mold resin covering the outside of the windings on both the upper and lower ends is thicker than the thickness of the mold resin covering the outside of the windings in the center.
  • FIG. 1 It is a perspective view which shows the appearance of a general three-phase tripod type mold transformer. It is sectional drawing of the three-phase tripod type mold transformer of FIG. 1 seen from the front of the iron core and the winding part. It is a figure which shows the primary winding of the cylindrical winding system of a general coil transformer. It is a figure which shows the primary winding of the cylindrical winding system of the mold transformer of Example 1. FIG. It is a figure which shows the primary winding of the disk winding system of the coil transformer of Example 2. FIG. It is sectional drawing of the general single-phase type mold transformer.
  • FIG. 1 shows a perspective view of a general three-phase tripod type mold transformer 100.
  • FIG. 2 shows a cross-sectional view of a three-phase tripod type mold transformer seen from the front of the iron core and the winding portion.
  • the three-phase tripod type mold transformer 100 two inner cores 30b are juxtaposed and outer cores 30a are arranged so as to surround the two inner cores 30b to form a tripod core. Then, secondary windings (low pressure windings) 20u, 20v, 20w covered with an insulating mold resin are arranged on each of the three iron core legs, and the outside thereof is covered with the insulating mold resin.
  • a transformer is configured by arranging primary windings (high pressure windings) 10u, 10v, 10w.
  • 40a and 40b are metal upper fasteners and lower fasteners
  • 50 is a secondary terminal board. Although the terminal of the primary winding is not shown, it is drawn out from the front side of the primary winding.
  • the distance d1 between the primary windings 10u, 10v, 10w and the yoke portion of the iron core is shortened at the portion where the two primary windings are adjacent to each other, and a lightning surge invades. If this is the case, dielectric breakdown is likely to occur.
  • FIG. 3 shows the primary winding of the cylindrical winding method of a general mold transformer.
  • FIG. 3A shows a perspective view of a primary winding assembly covered with a mold resin
  • FIG. 3B shows a cross-sectional view of a portion AB of FIG. 3A.
  • the winding conductor 13 of the first layer is wound by sequentially shifting the winding conductor 13 of the primary winding 10 from top to bottom in the axial direction, and then winding the second layer on the outside of the first layer.
  • the wire conductor 13 is sequentially shifted from the bottom to the top and wound around, and this is repeated to form the winding 11.
  • the winding conductor 13 is provided with wire insulation 14.
  • the winding 11 is covered with the insulating mold resin 16 to form the primary winding 10.
  • 11S indicates the winding start end of the winding
  • 11E indicates the winding end end of the winding.
  • the distance between the 400th conductor corresponding to the winding end end 11E of the winding 11 and the upper end portion of the mold resin 16 is L0, and the 400th conductor and the mold resin are formed.
  • the distance from the outer surface of the primary winding covered with, that is, the thickness of the mold resin on the outside of the primary winding is as thin as T0.
  • Inner cores 30b are arranged above and below the winding 11. Since the dielectric strength of air is lower than the dielectric strength of the mold resin, when a lightning surge enters the primary winding (high pressure winding) 10, it becomes a winding conductor at the outer end of the primary winding. Discharge may occur between the iron core and the air layer (gas discharge). Further, there is a possibility that electric discharge may occur along the creeping surface of the mold resin 16 (creepial discharge). Then, these discharges cause dielectric breakdown.
  • the present invention improves the impulse resistance characteristics by a simple winding method by improving the winding structure of the primary winding.
  • FIG. 4A shows a perspective view in which only the primary winding 10 included in the mold transformer 100 shown in FIG. 1 is taken out.
  • FIG. 4B shows a cross-sectional view taken along the line AB of FIG. 4A, showing the configuration of the winding of the cylindrical winding method.
  • the cylindrical winding method is a method in which the winding is wound in the axial direction of the winding (height direction in the figure).
  • the winding conductor 13 of the first layer is started to be wound from the winding start end 11S, is wound by sequentially shifting from top to bottom in the axial direction of the winding, and then wound on the outside of the first layer.
  • the second-layer winding conductor 13 is sequentially shifted from bottom to top and wound. Then, this is repeated to form the winding 11.
  • one or more layers of windings on the outer side near the winding end end 11E of the winding 11 are wound around the center of the primary winding 10 without being wound on both upper and lower ends. It is characterized by.
  • the windings of the two layers outside the primary winding are wound only in the central portion.
  • the mold resin 16 is formed so as to cover the upper and lower ends and the inner and outer sides of the winding 11.
  • the distance between the 351st conductor corresponding to the upper end of the outermost layer of the winding 11 and the upper end of the mold resin 16 is L1, and the conductor at the upper end of the layer on the inner peripheral side of the winding 11 (1st, 200th). , 201st conductor) and the upper and lower ends of the mold resin, the distance is larger than the distance L0.
  • the distance L1 between the 400th conductor corresponding to the lower end portion and the lower end portion of the mold resin 16 also increases.
  • the thickness of the mold resin at the upper end is as thick as T1.
  • the impulsive resistance can be improved by a simple winding method.
  • the molded transformer of the second embodiment of the present invention will be described with reference to FIG.
  • the difference from the first embodiment is that the winding method of the primary winding is a disk winding method.
  • the disc winding method is a method in which the winding conductor 13 is wound in the radial direction of the primary winding. As shown in FIG. 5B, the first layer on the upper end side is wound inward in the radial direction from the winding start end 11S of the winding 11, and then the second layer is diametered on the lower side of the first layer. Wind outward in the direction. Then, this is repeated to form the winding 11.
  • the number of windings of the windings of several layers above and below near the winding start end 11S and the winding end end 11E of the winding 11 is made smaller than the number of windings in the central portion of the primary winding 10. It is characterized by.
  • the windings of the three layers on the upper and lower ends of the primary winding are reduced by two from the windings of the central layer. Then, the mold resin 16 is formed so as to cover the upper and lower ends and the inner and outer sides of the winding 11.
  • the distance between the 14th conductor corresponding to the upper end portion in the outermost layer of the central portion of the winding 11 and the upper end portion of the mold resin 16 is L1, and the upper end on the inner peripheral side of the winding 11 is formed.
  • the distance between the conductors (first, second, and third conductors) and the upper end of the mold resin is larger than the distance L0.
  • the distance L1 between the 387th conductor corresponding to the lower end portion and the lower end portion of the mold resin 16 also increases.
  • the thickness of the mold resin is as thick as T1.
  • the impulse resistance can be improved by a simple winding method.
  • the molded transformer of the third embodiment of the present invention will be described with reference to FIG.
  • the difference from the first embodiment is that it is a single-phase type molded transformer.
  • secondary windings (low-pressure windings) 20a and 20b covered with an insulating mold resin are arranged on each of the two core legs of the rectangular iron core, and insulation is provided on the outside thereof.
  • Primary windings (high-pressure windings) 10a and 10b covered with a resin mold resin are arranged to form a transformer.
  • the impulse resistance can be improved by a simple winding method.
  • the present invention can be applied to other molded transformers such as a three-phase five-legged molded transformer.
  • the present invention is not limited to the above-described embodiment, and includes various modifications.
  • the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner. Not limited to.
  • the number of winding layers on the upper and lower end sides of the cylindrical winding method of Example 1 is assumed to be 3 and the central portion is assumed to be 5 layers, the description is not limited to this.
  • the number of windings on the winding start end side and the winding end end side of the disc winding method of the second embodiment is described assuming that the winding is performed 3 times in the radial direction and the central portion is wound 5 times in the radial direction. However, this is not the case.

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

Abstract

Transformateur moulé dans lequel la structure d'enroulement de l'enroulement primaire est améliorée pour augmenter une caractéristique de résistance aux impulsions à l'aide d'un schéma d'enroulement simple. Le transformateur moulé comprend un noyau de fer, un enroulement secondaire recouvert par une résine de moulage disposé sur une partie patte du noyau, et un enroulement primaire recouvert par une résine de moulage disposé sur l'extérieur de l'enroulement secondaire. Dans l'enroulement primaire, le nombre de tours de l'enroulement dans la direction radiale au niveau des extrémités supérieure et inférieure est plus petit que le nombre de tours de l'enroulement dans la direction radiale au niveau de la partie centrale, et l'épaisseur de la résine de moulage recouvrant l'extérieur de l'enroulement au niveau des extrémités supérieure et inférieure est supérieure à l'épaisseur de la résine de moulage recouvrant l'extérieur de l'enroulement au niveau de la partie centrale.
PCT/JP2021/009918 2020-10-27 2021-03-11 Transformateur moulé WO2022091447A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-180030 2020-10-27
JP2020180030A JP2022070768A (ja) 2020-10-27 2020-10-27 モ－ルド変圧器

Publications (1)

Publication Number Publication Date
WO2022091447A1 true WO2022091447A1 (fr) 2022-05-05

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PCT/JP2021/009918 WO2022091447A1 (fr) 2020-10-27 2021-03-11 Transformateur moulé

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JP (1) JP2022070768A (fr)
WO (1) WO2022091447A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52145726A (en) * 1976-05-29 1977-12-05 Toshiba Corp Induction winding electrical appliance
JPS5373413U (fr) * 1976-11-22 1978-06-20
JPS59145017U (ja) * 1983-03-18 1984-09-28 日新電機株式会社 空心限流リアクトル
JP2003158018A (ja) * 2001-11-20 2003-05-30 Hitachi Ltd モールドコイル及びモールド変圧器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52145726A (en) * 1976-05-29 1977-12-05 Toshiba Corp Induction winding electrical appliance
JPS5373413U (fr) * 1976-11-22 1978-06-20
JPS59145017U (ja) * 1983-03-18 1984-09-28 日新電機株式会社 空心限流リアクトル
JP2003158018A (ja) * 2001-11-20 2003-05-30 Hitachi Ltd モールドコイル及びモールド変圧器

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JP2022070768A (ja) 2022-05-13

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