EP0710965A2 - Transformer structure and equipment therefor - Google Patents

Transformer structure and equipment therefor Download PDF

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Publication number
EP0710965A2
EP0710965A2 EP95307848A EP95307848A EP0710965A2 EP 0710965 A2 EP0710965 A2 EP 0710965A2 EP 95307848 A EP95307848 A EP 95307848A EP 95307848 A EP95307848 A EP 95307848A EP 0710965 A2 EP0710965 A2 EP 0710965A2
Authority
EP
European Patent Office
Prior art keywords
transformers
transformer
molded
frames
phase
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.)
Withdrawn
Application number
EP95307848A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0710965A3 (enrdf_load_stackoverflow
Inventor
Makoto Yamamoto
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0710965A2 publication Critical patent/EP0710965A2/en
Publication of EP0710965A3 publication Critical patent/EP0710965A3/xx
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
    • 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
    • H01F27/02—Casings
    • H01F27/022—Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/16—Cascade transformers, e.g. for use with extra high tension

Definitions

  • the present invention relates to a transformer structure and equipment therefor wherein the installation area required for power distribution transformers installed inside a cubicle can be reduced.
  • transformers used for the measurement of electric current Inside cubicles which are installed at substations, etc., current transformers used for the measurement of electric current, instrument transformers used for the measurement of voltage, and relays, etc. are installed in a prescribed layout around transformers used for power distribution, and these respective components are connected by cables.
  • transformers oil-containing transformers, in which a steel box is filled with an insulating oil and a transformer main body is immersed in such an oil, are generally known.
  • Figure 9 is a circuit diagram of a transformer system which has generally been used in the past for three-phase/single-phase transformation, and a plurality of relays VCB and switches PCS are required therein. In the case of this system, furthermore, there is an extremely high danger of burning damage to the transformers when the load on the secondary side increases.
  • the transformer structure of this application is constructed so that molded transformers 2, which are formed by molding transformers by a molding material 1 consisting of an insulating material such as a synthetic resin or synthetic rubber, etc., are positioned and fastened in place inside frames 3, and a plurality of such frames are stacked in a vertical direction.
  • molded transformers 2 which are formed by molding transformers by a molding material 1 consisting of an insulating material such as a synthetic resin or synthetic rubber, etc.
  • the molded transformers 2 are installed inside the frames 3 so that the central axes P of the windings of each transformer Tr are positioned vertically as shown in Figure 8. Accordingly, when a plurality of frames 3 are stacked, the lines of magnetic force (indicated by two-dot chain lines) from the molded transformers 2, 2 installed above and below interfere with each other as shown in Figure 7, thus causing the frames 3 to vibrate which leads to problems such as the generation of noise and the generation of heat.
  • the present invention is devised in light of the drawbacks encountered in the prior art described above and is proposed for the purpose of solving these problems in a suitable manner.
  • the object of the present invention is to provide a transformer structure and equipment thereof which make it possible to accomplish a smaller size by reducing the installation area to be occupied by the transformers inside a cubicle and which also make it possible to prevent the generation of vibrational noise and heat.
  • the transformer structure of the invention of the present application is characterized in that: transformers used for power distribution are molded by an insulating material such as a synthetic resin, synthetic rubber, etc., the thus molded transformers are positioned and fastened in place inside frames so that the central axes of the windings of such molded transformers are placed horizontally, and a plurality of such frames that contain such molded transformers are stacked in the vertical direction, and the respective transformers are connected to each other by wires.
  • the transformer structure of another invention of the present application is characterized in that: single-phase transformers used for power distribution are molded by an insulating material such as a synthetic resin, synthetic rubber, etc., the thus molded transformers are positioned and fastened in place inside frames so that the central axes of the windings of such molded transformers are placed horizontally, and a plurality of such frames that contain such molded transformers are stacked in the vertical direction, and the respective single-phase transformers are connected to each other by V-V wiring.
  • an insulating material such as a synthetic resin, synthetic rubber, etc.
  • the equipment for the transformer structure of still another invention of the present application is characterized in that: molded transformers, each of which is formed by molding a power distribution transformer by an insulating material such as a synthetic resin, synthetic rubber, etc. and current and instrument transformers, which are connected to such a molded transformer, are molded into integral units by an insulating material such as a synthetic resin, synthetic rubber, etc.
  • the thus obtained transformer structures are respectively installed inside frames so that the central axes of the windings of such transformers are placed horizontally, and a transformer apparatus, which is obtained by stacking a plurality of such frames in the vertical direction and by connecting the transformers of the transformer structures which are installed inside such frames to each other by means of wires, is installed inside a cubicle.
  • Figure 1 is a front view of the schematic layout of an equipment for transformer structures constituting an embodiment of one invention of the present application.
  • Figure 2 is an explanatory diagram which illustrates the schematic structure of a transformer apparatus constituting an embodiment of one invention of the present application.
  • Figure 3 is an explanatory diagram which illustrates the internal structure of a molded transformer used in an embodiment of one invention of the present application.
  • Figure 4 is a wiring diagram of a transformer used in an embodiment of one invention of the present application.
  • FIG. 5 is a circuit diagram of a transformer apparatus constituting an embodiment of the invention of the present application.
  • Figure 6 is a front view of the schematic layout of transformer equipment that uses a transformer structure, constituting another embodiment of the invention of the present application.
  • Figure 7 in a front view of the schematic layout of transformer equipment that uses a transformer structure proposed in a previous application filed by the present applicant.
  • Figure 8 is an explanatory diagram which illustrates the internal structure of the molded transformer shown in Figure 7.
  • Figure 9 is a circuit diagram of a transformer system constituting prior art.
  • FIG 1 shows the schematic layout of the transformer equipment for a transformer structure according to the embodiment, and a transformer apparatus 16, which is formed by stacking and connecting two frames 14, 14, each containing a transformer structure 12, in the vertical direction, is installed inside a cubicle 10.
  • each of the frames 14 is formed as a rectangular frame including an upper frame member 18 and a lower frame member 20, and a transformer structure 12 is positioned and fastened in between.
  • the upper frame 14 and the lower frame 14 are connected by fastening the lower frame member 20 of the upper frame 14 to the upper frame member 18 of the lower frame 14 by means of bolts in a multiple number of locations.
  • Each of the transformer structures 12 consists of a single-phase transformer Tr used for power distribution, a current transformer CT and an instrument transformer PT; and these respective transformers are connected to each other. More specifically, as shown in Figure 2, the single-phase transformer Tr is molded by a molding material 26, which is an insulating material, so as to obtain a molded transformer 23, and the current transformer CT and the instrument transformer PT are connected to the primary side of the single-phase transformer Tr which is inside the molded transformer 23. Furthermore, the molded transformer 23, current transformer CT and instrument transformer PT are all molded into an integral unit by a molding material 28, which consists of an insulating material such as a synthetic resin, synthetic rubber, etc., so that no high-voltage parts are exposed to the outside.
  • a molding material 28 which consists of an insulating material such as a synthetic resin, synthetic rubber, etc.
  • the transformer structures 12 which are molded by the molding material 28 are extremely safe structures, since there is absolutely no danger of fire due to the leakage of oil which is caused by transformers falling over as in conventional oil-containing transformers.
  • the molding materials 26 and 28 may be a synthetic resin such as an epoxy, polyester resin, etc. or a synthetic rubber such as a butyl rubber, ethylene-propylene rubber, etc.
  • the molded transformers 23 are installed inside the corresponding frames 14 so that as shown in Figure 3 the central axes P of the windings 30 of the transformer Tr are oriented horizontally.
  • the transformer structures 12, 12 are stacked as shown in Figure 1, the lines of magnetic force (indicated by two-dot chain lines) generated by the molded transformers 23, 23 positioned above and below are prevented from interfering with each other.
  • vibrational noise and heat caused by the interference of lines of magnetic force can be prevented.
  • An ammeter A which is connected to the current transformer CT and a voltmeter V which is connected to the instrument transformer PT are disposed outside the molding material 28. These ammeter A and voltmeter V are digital instruments which can perform measurements using a small current. The heat dissipating effect can be improved by forming through-holes in the molding material 28 in positions corresponding to the current transformer CT and instrument transformer PT.
  • the single-phase transformer Tr in the molded transformer 23 of the upper transformer structure 12 and the single-phase transformer Tr in the molded transformer 23 of the lower transformer structure 12 are as shown in Figure 4 connected by V-V wiring; and three-phase AC transformation is performed by U, V, W-u, v, w, and a single-phase alternating current is extracted from o.
  • the wiring is different-capacity V-V wiring wherein, for example, a 200 KVA single-phase transformer Tr is installed on the upper side and a 300 KVA single-phase transformer Tr is installed on the lower side.
  • a relay VCB is connected to the current transformer CT and to the instrument transformer PT which are connected to the primary side of the single-phase transformer Tr in the molded transformer 23.
  • the relay VCB is separated from the transformer structure 12; however, it would be possible to mold the relay VCB integrally with the transformer structure 12.
  • this embodiment of the transformer apparatus 16 is extremely simple and is able to withstand the load applied to the secondary side of the transformers so that burning damage to the transformers Tr can be prevented.
  • the reference numeral 32 in Figure 1 indicates blowers such as silocco fans, etc., which are installed in the cubicle 10.
  • a cooling effect can be obtained by using the blowers 32 so as to introduce outside air into the cubicle 10.
  • An air exhaust port (not shown) is formed in the side of the cubicle 10.
  • the blowers 32 on the frames 14 which contain the transformer structures 12 so that air is blown directly onto the transformer structures 12 by such blowers 32.
  • each individual transformer structure 12 is constructed by using the molding material 28 so as to mold the molded transformer 23, current transformer CT and instrument transformer PT into an integral unit.
  • a plurality of such transformer structures 12 can be stacked in the vertical direction, and the installation area occupied by the transformers inside the cubicle 10 can be reduced.
  • the cubicle 10 can be installed either outdoors or indoors, and the space in the installation location can be effectively utilized as a result of the reduction in the installation area.
  • the electrical wiring system can be supplied as a system for a single transformer structure 12.
  • the transformer structures by installing the transformer structures in a stacked fashion, the lines of magnetic force generated by the molded transformers 23, 23 positioned above and below are prevented from interfering with each other; accordingly, vibrational noise and heat generated by such interference of lines of magnetic force can be prevented.
  • the transformer apparatus 16 in which, for example, a 200 KVA transformer Tr is installed above and a 300 KVA transformer Tr is installed below can be quickly and simply converted into a transformer apparatus 16 in which, for example, a 300 KVA transformer Tr is installed above and a 500 KVA transformer Tr is installed below.
  • working time can be shortened and costs can be reduced.
  • the current transformers CT and instrument transformers PT are also molded, it is possible to increase the useful life of these transformers. As a result, there is almost no need for maintenance or inspection; and the working characteristics of the system do not suffer despite the fact that the transformer structures can be stacked in the vertical direction.
  • two transformer structures which are equipped with single-phase transformers are stacked; however, as shown in Figure 6, it would be possible to stack, for example, three transformer structures 12 that contain single-phase transformers. In addition, it would also be possible to stack four or more transformer structures. Moreover, it would also be possible to stack transformer structures equipped with three-phase transformers or to stack a combination of transformer structures equipped with single-phase transformers and transformer structures equipped with three-phase transformers. In addition, it would also be possible to integrally mold AVR's (automatic voltage regulators), LRD's, WW's, etc. inside the transformer structures.
  • AVR's automatic voltage regulators

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Patch Boards (AREA)
  • Insulating Of Coils (AREA)
  • Transformers For Measuring Instruments (AREA)
EP95307848A 1994-11-04 1995-11-02 Transformer structure and equipment therefor Withdrawn EP0710965A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6295848A JPH08138953A (ja) 1994-11-04 1994-11-04 トランス構造および変電設備
JP295848/94 1994-11-04

Publications (2)

Publication Number Publication Date
EP0710965A2 true EP0710965A2 (en) 1996-05-08
EP0710965A3 EP0710965A3 (enrdf_load_stackoverflow) 1996-06-12

Family

ID=17825978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95307848A Withdrawn EP0710965A2 (en) 1994-11-04 1995-11-02 Transformer structure and equipment therefor

Country Status (5)

Country Link
EP (1) EP0710965A2 (enrdf_load_stackoverflow)
JP (1) JPH08138953A (enrdf_load_stackoverflow)
KR (1) KR960019352A (enrdf_load_stackoverflow)
CN (1) CN1128395A (enrdf_load_stackoverflow)
TW (1) TW255072B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014039031A (ja) * 2012-08-10 2014-02-27 Sts Spezialwagen-Trnaformatoren Stockach Gmbh & Co Kg 中波変圧器

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6198374B1 (en) * 1999-04-01 2001-03-06 Midcom, Inc. Multi-layer transformer apparatus and method
CN111180181B (zh) * 2019-12-20 2021-05-11 中国航天时代电子有限公司 一种双堆叠结构1553b总线隔离变压器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH295423A (de) * 1951-11-20 1953-12-31 Oerlikon Maschf Messwandlerkaskade.
DE1488280B2 (de) * 1963-04-10 1970-06-11 Raupach, Dr.-Ing. E.h. Friedrich, 8600 Bamberg Transformator-Anordnung aus drei Einzeltransformatoren in Isoliermantelbauweise
US3761853A (en) * 1972-11-13 1973-09-25 Hipotronics Mechanically variable modular high reactivity power inductor for high a. c. voltage resonant testing of capacitive loads
JPS63292612A (ja) * 1987-05-26 1988-11-29 Tokyo Electric Power Co Inc:The 計器用変圧変流器およびその交換方法
JPH06292308A (ja) * 1993-04-05 1994-10-18 Makoto Yamamoto 変電設備

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014039031A (ja) * 2012-08-10 2014-02-27 Sts Spezialwagen-Trnaformatoren Stockach Gmbh & Co Kg 中波変圧器
US9437356B2 (en) 2012-08-10 2016-09-06 Sts Spezial-Transformatoren-Stockach Gmbh & Co. Kg Medium frequency transformer

Also Published As

Publication number Publication date
TW255072B (en) 1995-08-21
KR960019352A (ko) 1996-06-17
EP0710965A3 (enrdf_load_stackoverflow) 1996-06-12
JPH08138953A (ja) 1996-05-31
CN1128395A (zh) 1996-08-07

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