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EP0117515B1 - Reactor having a plurality of coaxially disposed windings - Google Patents

Reactor having a plurality of coaxially disposed windings Download PDF

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Publication number
EP0117515B1
EP0117515B1 EP19840101816 EP84101816A EP0117515B1 EP 0117515 B1 EP0117515 B1 EP 0117515B1 EP 19840101816 EP19840101816 EP 19840101816 EP 84101816 A EP84101816 A EP 84101816A EP 0117515 B1 EP0117515 B1 EP 0117515B1
Authority
EP
European Patent Office
Prior art keywords
windings
reactor
winding
disposed
adjacent
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
EP19840101816
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0117515A1 (en
Inventor
Toshimitsu Obata
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 EP0117515A1 publication Critical patent/EP0117515A1/en
Application granted granted Critical
Publication of EP0117515B1 publication Critical patent/EP0117515B1/en
Expired 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
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • H01F37/005—Fixed inductances not covered by group H01F17/00 without magnetic core
    • 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
    • H01F30/08—Fixed transformers not covered by group H01F19/00 characterised by the structure without magnetic core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00

Definitions

  • the present invention relates to reactors of the air-core type and the iron-core type for use in electric installations, such as substations, power stations, and more particularly to the arrangement of windings in such reactors.
  • a reactor such as an air-core reactor, an iron-core reactor having a gap called gapped core type reactor
  • one winding is provided for each phase as shown in Figs. 3 and 7 of Japanese Patent Application Laid-open No. 43820/80 and in Figs. 3 and 4 of Japanese Patent Application Laid-open No. 22837/80.
  • a multi-layer winding arrangement is known which is constituted by inner and outer windings 1 and 2 of substantially cylindrical form coaxially disposed and connected in series to each other, as shown in Fig. 1 of the present application.
  • the reference numeral 6 designates a magnetic shielding constituted, generally, by a silicon steel plate, and the inner and outer windings 1 and 2 are supported by a supporting member, such as a winding insulator tube, (not shown).
  • the inductance value of the reactor is determined as a necessity if a necessary capacity (voltagexcurrent) with respect to a predetermined circuit voltage is determined, and a reactor having such an inductance value is produced and disposed in a substation or in a power station. Accordingly, if the necessary capacity of the reactor is required to be increased, a further reactor is newly produced and disposed side by side with the previously disposed reactor, and the two reactors are connected in series or in parallel with each other. In the case where the necessary capacity of the reactor is to be decreased, on the other hand, another reactor has to be produced so that the existing reactor is replaced by the newly produced reactor.
  • An object of the present invention is to eliminate the defects in the prior art as described above and to provide a reactor which can cope with the alteration of required capacity, which requires a narrow area for the installation thereof, and which can be manufactured economically.
  • CA-A-614,443 discloses a reactor with the features contained in the first part of claim 1. This document, however, is concerned with devising a reactor of a given electrical interconnection rather than with the possibility of adapting a given structure to varying needs and, accordingly, in all embodiments of the reactor shown in this document, just one pair of external terminals is provided for connection to the power source.
  • GB-A-364,200 discloses an arrangement of two cylindrical chokes mounted concentrically in relation to each other.
  • the chokes are subdivided and interconnected so that the self-inductances of the two chokes are equal to each other. Again, this document is not concerned with the object underlying the present invention.
  • an inner winding 1 of cylindrical form and an outer winding 2 of cylindrical form are coaxially disposed and connected in series with each other through a connecting wire C.
  • the windings 1 and 2 are wound in the same direction.
  • Terminals 3 and 4 to be connected to an external power source are connected to one and the other end or the upper and lower end of the winding 1, in the drawing, respectively, and a terminal 5 to be connected to the external power source is connected to the lower end of the winding 2, in the drawing, that is to one end of the winding 2 which is in opposition to the other end CP of the same winding 2 to which the other or lower end of the winding 1 is connected.
  • a magnetic shielding 6 is provided to substantially surround the inner and outer windings 1 and 2.
  • the inductance L of the reactor is expressed by the following equation: where N represents the number of turns of a winding, S represents the effective area of magnetic flux, and I represents the length of the gap.
  • a first inductance value L 1 which is the inductance of the winding 1 and which is expressed by the following equation (2), can be obtained by selectively using the terminals 3 and 4: where N 1 represents the number of turns of the winding 1, S 1 represents the sectional area with respect to the average diameter 0 1 of the winding 1.
  • a second inductance value L 2 which is larger than the inductance value L 1 , that is the combined inductance value of the windings 1 and 2 can be obtained as shown in the following equation (3) by selectively using the terminals 3 and 5: where N 2 represents the number of turns of the winding 2 and S 12 represents the sectional area with respect to the mean diameter D 12 of the resultant winding of the combined windings 1 and 2.
  • a third inductance value L 3 different from each of the above-mentioned inductance values L, and L 2 , that is the inductance value of the winding 2 can be obtained by selectively using the terminals 4 and 5, as expressed in the following equation (4): where S 2 represents the sectional area with respect to the mean diameter D 2 of the winding 2.
  • an inner winding 1 and an outer winding 2 are coaxially disposed and connected in series through a connecting wire C, similarly to the winding arrangement shown in Fig. 3.
  • the windings 1 and 2 are wound in the same direction.
  • Terminals 3 and 4 to be connected to an external power source are connected to one and the other end or the upper and lower end of the winding 1, in the drawing, respectively, and a terminal 5 to be connected to the external power source is connected to the lower end of the winding 2, in the drawing, that is one end of the winding 2 which is in opposition to the other end CP of the same winding 2 to which the other or lower end of the winding 1 is connected.
  • a yoke 7 is provided substantially to surround the windings 1 and 2, and a block core 8, which is constituted by a plurality of blocks, is provided coaxially with the windings 1 and 2.
  • Reference numeral 9 designates a minute gap between adjacent blocks.
  • the effective sectional area S in the equation (1) is determined to a fixed value substantially depending on the sectional area of the block core 8 in the direction perpendicularly crossing the axial direction of the windings, and, therefore, several kinds of inductance values can be obtained only by changing the number of turns N of each winding. This applies to the case where a reactor is provided with three or more windings provided coaxially with each other.
  • the gap length I can be obtained by multiplying the length All of each of the minute gaps 9 by the number n of the gaps 9.
  • a first inductance value of the reactance when the terminals 3 and 4 are selected can be expressed by the following equation (5):
  • a second inductance value L 2 of the reactance expressed by the following equation (6) can be obtained by selectively using the terminals 3 and 5:
  • a third inductance value L 3 of the reactance when the terminals 4 and 5 are selected, can be expressed as the equation (7) as follows:
  • inductance values L 1 , L 2 and L 3 can be obtained in a single reactor, in the same manner as the first embodiment.
  • the windings 1 and 2 are wound in the opposite direction to each other differing from the first and second embodiments, while the windings 1 and 2 are disposed coaxially.
  • the series connection between the windings 1 and 2 may be performed by connecting the respective lower ends of the windings 1 and 2, in the drawing, by a connecting lead C so that the length of the connecting lead C can be reduced in comparison with the first and second embodiments.
  • the terminal 5 is provided at the upper end of the winding 2 as seen in the drawing.
  • Fig. 6 shows an embodiment in which the present invention is applied to a reactor of the air-core type, it is a matter of course that the present invention can be applied to a reactor of the iron-core type in the same manner as the embodiment of Fig. 6.
  • Fig. 7 shows an embodiment in which three windings, 1, 2 and 11 are concentrically disposed.
  • the effect similar to the previous embodiments can be obtained in this embodiment. That is, six kinds of inductance values can be obtained by selecting any two of four terminals 3, 4, 5 and 10.
  • the number of the coaxially disposed windings is not limited to two or three but can be selected to four or more.
  • the current flowing in the respective winding varies depending on the selection of terminal when the applied voltage is constant. That is, for example in the first embodiment, assume that the inductance value is selected merely between L 1 and L 2 , and that a current 1 1 flows only in the winding 1 when the inductance value L, while current 1 2 flows in the windings 1 and 2 when the inductance value L 2 is selected.
  • the current 1 2 is smaller than the current 11,
  • the sectional area S b of the winding 2 is set to a value obtained by the following equation (8):

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Transformers For Measuring Instruments (AREA)
EP19840101816 1983-02-25 1984-02-21 Reactor having a plurality of coaxially disposed windings Expired EP0117515B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP29440/83 1983-02-25
JP2944083A JPS59155910A (ja) 1983-02-25 1983-02-25 リアクトル

Publications (2)

Publication Number Publication Date
EP0117515A1 EP0117515A1 (en) 1984-09-05
EP0117515B1 true EP0117515B1 (en) 1987-05-13

Family

ID=12276189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840101816 Expired EP0117515B1 (en) 1983-02-25 1984-02-21 Reactor having a plurality of coaxially disposed windings

Country Status (3)

Country Link
EP (1) EP0117515B1 (ja)
JP (1) JPS59155910A (ja)
DE (1) DE3463704D1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0832171B2 (ja) * 1990-02-14 1996-03-27 株式会社村田製作所 多出力スイッチングレギュレータ
US6417753B1 (en) * 2000-02-17 2002-07-09 Koninklijke Philips Electronics N.V. Planar magnetic device without center core leg

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA614443A (en) * 1961-02-14 J. Mackinnon Lloyd Electrical reactor
GB364200A (en) * 1930-01-25 1932-01-07 Siemens Ag Improvements in choking coils for heavy current networks
DE1151869B (de) * 1960-07-11 1963-07-25 Licentia Gmbh Kernlose Starkstromdrosselspule mit magnetisch leitenden Jochen
CH408196A (de) * 1962-12-07 1966-02-28 Smit & Willem & Co Nv Drosselspule, insbesondere für hohe Spannung und grosse Leistung
DE2159111A1 (de) * 1971-01-19 1972-09-07 Viszek Villamosipari Szolgalta Drosselspule mit Eisenkern

Also Published As

Publication number Publication date
DE3463704D1 (en) 1987-06-19
EP0117515A1 (en) 1984-09-05
JPS59155910A (ja) 1984-09-05

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