EP2963662B1 - Ölgefüllter transformator - Google Patents

Ölgefüllter transformator Download PDF

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Publication number
EP2963662B1
EP2963662B1 EP13876561.5A EP13876561A EP2963662B1 EP 2963662 B1 EP2963662 B1 EP 2963662B1 EP 13876561 A EP13876561 A EP 13876561A EP 2963662 B1 EP2963662 B1 EP 2963662B1
Authority
EP
European Patent Office
Prior art keywords
coil
thermosetting resin
impregnated fiber
wound
oil
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.)
Not-in-force
Application number
EP13876561.5A
Other languages
English (en)
French (fr)
Other versions
EP2963662A4 (de
EP2963662A1 (de
Inventor
Ryousuke MIKOSHIBA
Hiroyuki Endo
Makoto Shinohara
Toshiaki Takahashi
Tatsunori Sato
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 Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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Filing date
Publication date
Application filed by Hitachi Industrial Equipment Systems Co Ltd filed Critical Hitachi Industrial Equipment Systems Co Ltd
Publication of EP2963662A1 publication Critical patent/EP2963662A1/de
Publication of EP2963662A4 publication Critical patent/EP2963662A4/de
Application granted granted Critical
Publication of EP2963662B1 publication Critical patent/EP2963662B1/de
Not-in-force legal-status Critical Current
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
    • H01F30/06—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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to an oil-filled transformer, and more particularly to a coil.
  • the core and coil assembling phase of the manufacturing process of transformers using amorphous iron cores includes a step of turning the coil sideways, and this might damage insulating paper in varnished coils.
  • large-capacity transformers would have heavier coils and iron cores, and the surface of the insulating paper is fixed with varnish, involving the risk that the paper in the coil might become cracked to cause destruction of insulation.
  • the mechanical force working on the coils in time of short circuiting occurs not only between the high-voltage and low-voltage side windings but also in the coil axis direction on account of a deviation between the center heights of the high-voltage and low-voltage side windings.
  • a conventional oil-filled transformer suppresses the mechanical force working on the coils in time of short circuiting by aligning the center heights of the high-voltage and low-voltage side windings in the coil axis direction, varnishing the coils, and suppressing them with upper and lower metal clamps.
  • the rising positions of tap lines are especially susceptible to the deviation in the center heights of coils and accordingly, the mechanical force working in the axial direction in time of short circuiting increases.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. Sho 61-51811 discloses a resin mold coil for a transformer having such coils that eliminates deformation by the tare weight of coils in the manufacturing process, thereby enhancing the mechanical strength working in the coil axis direction in time of short circuiting.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. Sho 61-51811
  • Patent Literature 1 concerns a technique regarding resin mold coils by which coils for oil-filled transformers are fixed with resin, but does not disclose anything about enhancing the mechanical strength working on the coils for oil-filled transformers in time of short circuiting without varnishing.
  • the present invention is intended, in view of eliminating the possibility of destroying the insulation of varnished coils, to address the weakening of the mechanical strength in the coil axis direction in time of short circuiting in the manufacturing process of coils without varnishing.
  • one or another of the configurations disclosed in the Claims is used.
  • one example is an oil-filled transformer mounted with an iron core formed of an amorphous ribbon or a silicon steel sheet and a coil of which both high-voltage and low-voltage windings are formed of flat or round conductor lead wires wound around the iron core, wherein a thermosetting resin-impregnated fiber is wound in the coil axis direction around the coil in a tap line wire lead part, and further the thermosetting resin-impregnated fiber is wound in the outermost layer of the coil.
  • the thermosetting resin-impregnated fiber may be a glass binding tape using epoxy resin.
  • an oil-filled transformer having cylindrical coils configured of flat or round conductor lead wires on both high-voltage and low-voltage windings can secure sufficient mechanical strength in the coil axis direction in time of short circuiting without varnishing. Furthermore, the dispensability of varnishing contributes to increased reliability of large-capacity transformers using amorphous ribbons because of the absence of the risk of destruction of insulation by the tare weights of coils or iron cores, and highly efficient transformers significantly improved in non-load losses for wind power generation or the like can be made available.
  • FIG. 1A shows a perspective view of a coil iron core assembly to be housed in an oil-filled transformer
  • Fig. 1B a perspective view of partially notched part of the coil iron core assembly of Fig. 1A
  • Fig. 1C an upper clamp
  • Fig. 1D a lower clamp.
  • 101 denotes a coil
  • 102 a tap line wire lead part
  • 103 an iron core
  • 104A an upper clamp
  • 104B a lower clamp
  • 105A and 105B thermosetting resin-impregnated fibers.
  • Fig. 1A shows the inner part of a coil iron core assembly for use in a three-phase five-leg wound iron core transformer, in which the thermosetting resin-impregnated fiber 105A is wound in the coil axis direction around the tap line wire lead part 102 of the coil 101, and further the thermosetting resin-impregnated fiber 105B is wound in the horizontal direction around the outermost circumference of the coil 101.
  • the coil iron core assembly of the oil-filled transformer including a five-leg wound iron core 103 formed of an amorphous ribbon or a silicon steel sheet, the coil 101 in which both the high-voltage (primary side) and the low-voltage (secondary side) windings are formed of flat or round conductor lead wires, and the upper clamp 104A and the lower clamp 104B which press the coil 101 by clamping in the axial direction.
  • the upper clamp 104A has a configuration having a flange formed by bending a plate in a U shape and disposing it on a side in the lengthwise direction as shown in Fig. 1C , and a notch to stay away from the position of the tap line wire lead part 102 of the coil 101 is formed in this flange part.
  • the upper clamp 104A is supposed here to be formed in a U shape, it may instead be shaped as a rectangular box.
  • a plate is bent in a U shape to form a flange on a side in the lengthwise direction, and a notch is formed in this flange part in a position matching the tap line wire lead part of the coil 101.
  • the coil 101 is formed of the thermosetting resin-impregnated fiber 105A wound around the tap line wire lead part 102, which cannot be mechanically pressed in the coil axis direction, in the coil axis direction in the notched position of the upper clamp 104A, and the thermosetting resin-impregnated fiber 105B is also wound around in the horizontal direction of the outermost layer of the coil 101.
  • amorphous ribbon is used for the iron core 103
  • a thin ribbon of about 20 ⁇ m unlike a silicon steel sheet, is stacked between the iron core 103 and the coil 101 in the coil axis direction as shown in the partially expanded perspective view of Fig. 1B
  • the amorphous iron core is susceptible to deformation, and the thermosetting resin-impregnated fiber 105A is wound around in the coil axis direction 101 at portions where the iron core 103 overlaps on the coil 101.
  • thermosetting resin-impregnated fiber is a glass binding tape, which is a binding tape made of epoxy resin, and its advantages include high strength of the hardened product resulting from its heat treatment, excellent adhesiveness and high resistance to heat.
  • the base material is glass tape, featuring high tensile strength.
  • the resin is usually hardened by heating at 150°C for 15 hours.
  • Figs. 2A and 2B show perspective views of a coil iron core assembly that uses a three-phase tripod iron core and in which a thermosetting resin-impregnated fiber 205A is wound around in the vicinity of the tap part 202 of a coil 201 in the coil axis direction, and further a thermosetting resin-impregnated fiber 205B is wound around in the horizontal direction in the outermost layer of the coil 201.
  • 201 denotes a coil
  • 202 a tap line wire lead part
  • 203 an iron core
  • 203A an outer iron core
  • 203B an inner iron core
  • 204A an upper clamp
  • 204B a lower clamp
  • 205A a thermosetting resin-impregnated fiber wound around in the coil axis direction
  • 205B a thermosetting resin-impregnated fiber wound around in the outermost layer of the coil.
  • Fig. 2 further shows the coil iron core assembly of an oil-filled transformer including the coil 201 in which both the high-voltage (primary side) and the low-voltage (secondary side) windings are formed of flat or round conductor lead wires wound around the tripod iron core 203 formed of an amorphous ribbon or a silicon steel sheet, and an upper clamp 204A and a lower clamp 204B that clamp and press the coil 201 in the axial direction.
  • the coil 201 is formed by further winding, in a position where the upper clamp 204A is notched, the thermosetting resin-impregnated fiber 205A wound in the coil axis direction of the tap line wire lead part 202 permitting no mechanical pressing in the coil axis direction and, also in the horizontal direction around the outermost circumference of the coil 201, the thermosetting resin-impregnated fiber 205B is wound around.
  • the thermosetting resin-impregnated fiber 205A is wound around in the axial direction of the coil 201 where the iron core 203 overlaps the coil 201 as well.
  • Fig. 3A shows a perspective view of the coil iron core assembly of an oil-filled transformer.
  • the coil iron core assembly uses a three-phase tripod laminated iron core, winds a thermosetting resin-impregnated fiber 305A in the coil axis direction in the vicinity of a tap part 302 of a coil 301, and further winds a thermosetting resin-impregnated fiber 305B in the horizontal direction around the outermost circumference of the coil 301.
  • 301 denotes the coil; 302, a tap line wire lead part; 303, an laminated iron core; 304A, an upper clamp; 304B, a lower clamp; 305A, the thermosetting resin-impregnated fiber in the vicinity of the tap part 302; and 305B, the thermosetting resin-impregnated fiber in the horizontal direction around the outermost circumference of the coil.
  • Fig. 3 shows the coil 301 in which both the high-voltage (primary side) and the low-voltage (secondary side) windings are formed of flat or round conductor lead wires is wound around the tripod laminated iron core 303 formed of a silicon steel sheet and the coil iron core assembly of the oil-filled transformer from the upper clamp 304A and the lower clamp 304B clamping pressing in the coil axis direction.
  • the coil 301 is formed by winding, in a position where the upper clamp 304A is notched, the thermosetting resin-impregnated fiber 305A wound in the coil axis direction of the tap line wire lead part 302 permitting no mechanical pressing in the coil axis direction and, also in the horizontal direction around the outermost circumference of the coil 301, the thermosetting resin-impregnated fiber 305B is wound around.
  • thermosetting resin-impregnated fiber is wound around a coil in the vicinity of a tap part.
  • Fig. 4(a) shows a perspective view of a thermosetting resin-impregnated fiber 405A wound around in the coil axis direction in the vicinity of a tap part 402 of a coil 401;
  • Fig. 4(b) a thermosetting resin-impregnated fiber tape 405A;
  • Fig. 4(c) a partially expanded perspective view of the tap part 402 of the coil 401;
  • Fig. 4(d) a partially expanded perspective view of Fig. 4(c) .
  • thermosetting resin-impregnated fiber 405A is collectively wound in the coil axis direction.
  • 402C denotes a position in which a tap terminal is to be arranged
  • 405B positions in which the thermosetting resin-impregnated fiber tape 405A is rounded and arranged on edges of cooling ducts 406 and the tape is expanded and pasted within the coil.
  • thermosetting resin-impregnated fiber tape 405A to be wound around the tap part 402 of the coil 401 in the coil axis direction is wound on the flank of the coil 401 in an expanded shape with the adhesive part of the tape pasted; on an end face in the upper part of the coil 401, it takes on a shape 405B in which the tape of the thermosetting resin-impregnated fiber tape 405A is rounded; and inside the coil 401 it is pasted onto the inner flank face in an expanded shape and wound.
  • thermosetting resin-impregnated fiber tape 405A takes on the round shape 405B on an end face of the coil 401 in order to prevent blocking of the cooling ducts 406 arranged in the coil.
  • the cooling ducts in the coil have spaces continuous from one end to the other of the coil. It is a hole for cooling the heat generated from the coil in the oil channel where insulating oil in the transformer passes.
  • thermosetting resin-impregnated fiber tape 405A is pasted in an expanded shape to a coil end face, air may be locked in the tape because its surface is rough and not completely flat.
  • the coil iron core assembly is placed in the oil-filled transformer, the space is filled with insulating oil and the transformer is operated, the insulation may be destroyed by air in the vicinity of the coil.
  • the configuration should be such that no coil can be locked in the oil end face.
  • thermosetting resin-impregnated fiber tape is wound layer by layer of the oil.
  • Fig. 5(a) shows a perspective view of the thermosetting resin-impregnated fiber tape 505A is wound in a first layer
  • Figs. 5(b) and 5(c) show partially expanded perspective views of the tape 505A wound around the tap part of the coil 501.
  • 501 denotes the coil; 502, a tap terminal; and 505A, a thermosetting resin-impregnated fiber.
  • the thermosetting resin-impregnated fiber tape 505A is collectively wound in the first layer of the coil 501 in the coil axis direction.
  • the position of the coil where the thermosetting resin-impregnated fiber 505A is wound also is the position where the tap part is disposed.
  • the tape 505A is wound in the coil axis direction in the position where the tap part of the coil 501 is disposed.
  • the tape is pasted in an expanded state on the flank side of the coil 501, on its end face side and further on the inner flank side of the coil.
  • thermosetting resin-impregnated fiber tape 505A is pasted layer by layer of the coil, and arranged by passing it through the cooling ducts 506 arrayed at equal intervals, bending and pasting it.
  • thermosetting resin-impregnated fiber is wound in part of two or more turns wound layer by layer of the coil.
  • Fig. 6 shows a perspective view of a configuration in which a thermosetting resin-impregnated fiber tape 605A is wound around each layer of a coil 601 in two or more turns (collectively in five turns in the illustrated case).
  • 601 denotes the coil
  • 602B a tap terminal
  • 605A the thermosetting resin-impregnated fiber.
  • the thermosetting resin-impregnated fiber tape is pasted in an expanded state and wound, and on the end face of the coil, the tape is pasted, with the inner flank also pasted in an expanded state and wound.
  • thermosetting resin-impregnated fiber tape 605A are collectively pasted and wound in the second coil layer like the first coil layer. This process is repeated to manufacture the whole coil.
  • thermosetting resin-impregnated fiber tape 605A is wound for a few turns of coil in the vicinity of the tap part.
  • thermosetting resin-impregnated fiber tape is wound in a position where the electromagnetic mechanical force is great in time of short circuiting at the beginning and end of coil winding.
  • Fig. 7 shows a perspective view of the beginning phase of coil winding, and the right-hand part, a perspective view of the ending phase of coil winding.
  • 701 denotes a coil
  • 702A a primary side tap terminal
  • 702B a secondary side tap terminal
  • 705A a thermosetting resin-impregnated fiber.
  • the thermosetting resin-impregnated fiber tape 705A is wound partially.
  • the tap terminal 702B is the secondary side tap terminal, while 702A denotes the primary side tap terminal.
  • 702A denotes the primary side tap terminal.
  • the secondary side tap terminal a few turns of the coil beginning to be wound in the vicinity of the tap are put together, and the thermosetting resin-impregnated fiber tape 705A is wound layer by layer.
  • Fig. 7 shows the secondary side tap terminal, where a few (five in the illustration) turns of the coil are collectively wound in the vicinity of the tap at the winding end, with the thermosetting resin-impregnated fiber tape 705A put together and wound layer by layer.
  • Fig. 8 shows a partially expanded perspective view of a coil of the method at a step where a thermosetting resin-impregnated fiber tape is wound.
  • Fig. 8(a) is a perspective view of cooling ducts arranged;
  • Fig. 8(b) a perspective view of segments of a tape placed between the cooling ducts;
  • Fig. 8(c) a perspective view of flat or round lead wires wound in a horizontal direction in a state in which the tape segments are erected;
  • Fig. 8(d) a perspective view of cooling ducts arranged over insulating paper wound on the coil surface;
  • Fig. 8(e) a perspective view of a configuration in which a thermosetting resin-impregnated fiber tape in an erect state is bent.
  • insulators denotes insulators; 820, rectangular materials; 830, spaces formed by the rectangular materials 820; and 805A, a thermosetting resin-impregnated fiber tape.
  • a cylindrical shape to serve as the base is formed of the insulators 810 within the coil, and the rectangular materials 820, which may be oil-resistant lumber or the like, are arranged at equal intervals on the outer circumference of the cylindrical base.
  • the spaces are formed by these adjoining rectangular materials 820, and insulating oil is passed through these spaces 830 to enable the spaces to serve as the cooling ducts 830 for cooling the coil.
  • thermosetting resin-impregnated fiber tape 805A is pasted to the insulators 810 in the spaces of the rectangular materials 820. Since the tape 805A is folded when it is pasted, one side part of the tape should be kept as it is.
  • a coil 801 is wound in a horizontal direction to form a first layer.
  • a flat or round lead wire is used as the coil and, as shown in Fig. 8(d) , a sheet-shaped insulator 811 is wound around the coil 801, and over it the rectangular materials 820 are further arranged at equal intervals.
  • the spaces 830 are formed between the rectangular materials 820 arranged at equal intervals to serve as the cooling ducts 830.
  • thermosetting resin-impregnated fiber tape 805A to be folded in being pasted into the spaces 830, formed of the rectangular materials 820, are pasted.
  • the configuration is such that the coil 801 is sandwiched between parts of the thermosetting resin-impregnated fiber tape 805A.
  • the whole coil is assembled by repeating the manufacturing steps illustrated in Figs. 8(a) to 8(e) .
  • Fig. 9 shows a perspective view of the oil-filled transformer housing the coil iron core assembly.
  • 900 denotes a tank of an oil-filled transformer body; 910, cooling ribs disposed around the tank; and 920, weld lines fixed to the upper and lower ends of the wavy ribs to strengthen and preventing deformation of the wavy ribs 910; 930, a high-voltage (primary side) terminal, which connects a high voltage supplied from a power plant and is connected to the tap line wire lead parts 102, 202 and 302; and 940, a low-voltage (secondary side) terminal for supplying a voltage generally lowered by the transformer to loads connected to the tap line wire lead parts 402B, 502B and 602B.
  • the present invention is not limited to the embodiments described above, and includes various modifications. For instance, these embodiments are described in detail to help understand the present invention, but they are not limited to embodiments including all the constituent elements described for each. It is also possible to replace part of the configuration of one embodiment to part of another, or to add an element or elements of the configuration of one embodiment to that of another. Further, it is possible to add to, delete from or substitute some element for the configuration of each embodiment.
  • adjoining coils can be fixed by winding with a thermosetting resin-impregnated fiber, and the rounds of thermosetting resin-impregnated fiber winding can be increased or reduced partly.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)

Claims (7)

  1. Ölgefüllter Transformator, ausgestattet mit einem Eisenkern (103), der aus einem amorphen Band oder einer Siliziumstahlblechlage und einer Spule, deren Hochspannungs- und Niederspannungswindungen aus flachen oder runden um den Eisenkern herum gewundenen Leiterdrähten gebildet sind, gebildet ist, wobei eine mit wärmehärtendem Harz imprägnierte Faser (105A) in der vertikalen Spulenachsenrichtung um die Spule in einem Anschlussleitungsdrahtteil (102) der Spule (101) gewunden ist und die mit dem wärmehärtenden Harz imprägnierte Faser (105B) ferner in der horizontalen Richtung um die äußerste Schicht der Spule (101) gewunden ist.
  2. Ölgefüllter Transformator nach Anspruch 1,
    wobei die mit dem wärmehärtendem Harz imprägnierte Faser ein Glasbindungsband unter Verwendung von Epoxidharz ist.
  3. Ölgefüllter Transformator nach Anspruch 1,
    wobei die mit dem wärmehärtendem Harz imprägnierte Faser in der Spulenachsenrichtung dort, wo der Eisenkern die Spule zwischen der Spule und dem Eisenkern überlappt, gewunden ist.
  4. Ölgefüllter Transformator nach Anspruch 1 oder 3,
    wobei die mit dem wärmehärtendem Harz imprägnierte Faser (405A, 505A, 605A) für die Spule kollektiv in der Spulenachsenrichtung gewunden ist.
  5. Ölgefüllter Transformator nach Anspruch 1 oder 3,
    wobei die mit dem wärmehärtendem Harz imprägnierte Faser (605A) in der axialen Richtung um jede Schicht der Spule (601) gewunden ist.
  6. Ölgefüllter Transformator nach Anspruch 1, 2 oder 4,
    wobei die mit dem wärmehärtendem Harz imprägnierte Faser (605A) in der Spulenachsenrichtung um jede Schicht einer Spule in zwei oder mehreren Windungen lediglich in einem Teil der Umgebung der Spulenendfläche gewunden ist.
  7. Ölgefüllter Transformator nach Anspruch 1 oder 2,
    wobei die mit dem wärmehärtendem Harz imprägnierte Faser (705A) in der Spulenachsenrichtung jeweils am Beginn und am Ende der Hochspannungs- und Niederspannungswindungen dort, wo die elektromagnetische mechanische Kraft zum Zeitpunkt eines Kurzschlusses groß ist, gewunden ist.
EP13876561.5A 2013-03-01 2013-03-01 Ölgefüllter transformator Not-in-force EP2963662B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/055744 WO2014132451A1 (ja) 2013-03-01 2013-03-01 油入変圧器

Publications (3)

Publication Number Publication Date
EP2963662A1 EP2963662A1 (de) 2016-01-06
EP2963662A4 EP2963662A4 (de) 2016-11-23
EP2963662B1 true EP2963662B1 (de) 2018-02-14

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EP (1) EP2963662B1 (de)
JP (1) JP6014747B2 (de)
CN (1) CN105074845B (de)
WO (1) WO2014132451A1 (de)

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CN105244148B (zh) 2015-10-30 2017-09-01 江苏华鹏变压器有限公司 一种解决非晶合金变压器抗短路问题的自夹持结构
JP7119646B2 (ja) 2018-06-28 2022-08-17 コクヨ株式会社 座席支持用構造体
CN110111982A (zh) * 2019-05-17 2019-08-09 沈阳工业大学 一种优化铁心绑固结构的非晶合金变压器及其制备方法
CN111584219A (zh) * 2020-06-10 2020-08-25 青岛鼎信通讯股份有限公司 一种应用于电力电子变压器的三相高频变压器
CN117393303B (zh) * 2023-11-17 2024-04-30 山东泰开箱变有限公司 新能源油浸式变压器抱铁心绕线工艺及装置

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Publication number Publication date
WO2014132451A1 (ja) 2014-09-04
EP2963662A4 (de) 2016-11-23
CN105074845A (zh) 2015-11-18
JPWO2014132451A1 (ja) 2017-02-02
CN105074845B (zh) 2017-05-31
JP6014747B2 (ja) 2016-10-25
EP2963662A1 (de) 2016-01-06

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