EP0117515A1 - Reactor having a plurality of coaxially disposed windings - Google Patents
Reactor having a plurality of coaxially disposed windings Download PDFInfo
- Publication number
- EP0117515A1 EP0117515A1 EP19840101816 EP84101816A EP0117515A1 EP 0117515 A1 EP0117515 A1 EP 0117515A1 EP 19840101816 EP19840101816 EP 19840101816 EP 84101816 A EP84101816 A EP 84101816A EP 0117515 A1 EP0117515 A1 EP 0117515A1
- 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.)
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Classifications
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- 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 (voltage x current) with respect to a predetermined circuit voltage is determined, and a reactor having such an inductance value is produced and disposed in an 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.
- the reactor having a plurality of windings disposed coaxially and connected to form a series circuit and a supporting member for supporting the plurality of windings
- two terminals respectively connected to the opposite ends of a specific one of the plurality of windings and a further terminal connected to one end of each winding other than the specified winding, the terminals being capable of being selectively connected to an external power source.
- the winding arrangement enables to provide various kinds of terminal combinations to be connected to the external power source so that a plurality of inductance values can be selectively obtained by selecting the terminal combinations.
- 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 and 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 l 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 D 1 of the winding 1.
- a second inductance value L 21 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 1 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 t can be obtained by multiplying the length ⁇ l 1 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
- 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 I I flows only in the winding 1 when the inductance value L 1 while current I 2 flows in the windings 1 and 2 when the inductance value L 2 is selected.
- the current I 2 is smaller than the current I 1 . Accordingly, it is not necessary to set the sectional area S b of the winding 2 to a value corresponding to the current I 1 , that is to a value as large as the sectional area S a of the winding 1.
- the sectional area S b may be set to a value not smaller than that obtained by the following equation (8): the sectional area of the conductor of the winding 2 is reduced to the value obtained in the equation (8), the more the conductor material can be reduced.
Abstract
Description
- 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.
- Generally, in 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. Further, 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. In Fig. 1, the reference numeral 6 designates a magnetic shielding constituted, generally, by a silicon steel plate, and the inner andouter windings 1 and 2 are supported by a supporting member, such as a winding insulator tube, (not shown). - In reactor having such a winding arrangement as described above, the inductance value of the reactor is determined as a necessity if a necessary capacity (voltage x current) with respect to a predetermined circuit voltage is determined, and a reactor having such an inductance value is produced and disposed in an 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.
- Considering the recent shortage of land required for a substation and a power station and the possible alteration of the necessary reactor capacity in the future, there is a problem that the required land has to be secured in advance in anticipation of additional provision of a further reactor or a further reactor has to be produced and disposed side by side, resulting in increase in charge of the original investment. Further, it is very uneconomical to produce and dispose a new reactor agreeable to a new requirement of the necessary reactor capacity every time the necessary reactor capacity be altered.
- 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.
- According to the present invention, in the reactor having a plurality of windings disposed coaxially and connected to form a series circuit and a supporting member for supporting the plurality of windings, there are provided two terminals respectively connected to the opposite ends of a specific one of the plurality of windings and a further terminal connected to one end of each winding other than the specified winding, the terminals being capable of being selectively connected to an external power source. The winding arrangement enables to provide various kinds of terminal combinations to be connected to the external power source so that a plurality of inductance values can be selectively obtained by selecting the terminal combinations.
- The above and other objects, features and advantages of the present invention will be apparent from the following detailed description of preferred embodiments thereof taken in conjunction with the accompanying drawings, in which:
- Fig. 1 is a schematic sectional view of a prior art reactor having two windings arranged coaxially;
- Fig. 2 is a plan view of the winding for single phase of an air-core type reactor provided with a magnetic shielding according to a first embodiment of the present invention;
- Fig. 3 is a cross-section along the III-III line of the first embodiment shown in Fig. 2;
- Fig. 4 is a plan view of the winding for single phase of a gapped core type reactor according to a second embodiment of the present invention;
- Fig. 5 is a cross-section along the V-V line of the second embodiment shown in Fig. 4; and
- Figs. 6 and 7 show modifications of the embodiment of Fig. 3.
- Referring to the drawings, `the present invention will be described in detail hereunder.
- Referring to Figs. 2 and 3, 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. Thewindings 1 and 2 are wound in the same direction.Terminals terminal 5 to be connected to the external power source is connected to the lower end of thewinding 2, in the drawing, that is to one end of thewinding 2 which is in opposition to the other end CP of thesame winding 2 to which the other or lower and of the winding 1 is connected. A magnetic shielding 6 is provided to substantially surround the inner andouter windings 1 and 2. The inductance L of the reactor is expressed by the following equation: - In order to obtain various values of inductance, accordingly, it will do to make the winding arragnement to provide various combinations of N, S and ℓ in the equation (1).
- That is, in the reactor arranged as shown in Fig. 3, a first inductance value L1, 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: - Alternatively, a second inductance value L21 which is larger than the inductance value L1, 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 theterminals 3 and 5:winding 2 and S12 represents the sectional area with respect to the mean diameter D12 of the resultant winding of the combinedwindings 1 and 2. - Alternatively, a third inductance value L3 different from each of the above-mentioned inductance values L1 and L2, that is the inductance value of the
winding 2, can be obtained by selectively using theterminals winding 2. - By suitably selecting any two of the three
terminals - Although the description has been made in the embodiment with respect to the arrangement for single phase of a reactor, the same effect can be obtained by arranging the winding for each of phases in the case where the reactor is of the polyphase type.
- Referring to Figs. 4 and 5 showing a second embodiment of the present invention, 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. Thewindings 1 and 2 are wound in the same direction.Terminals terminal 5 to be connected to the external power source is connected to the lower end of thewinding 2, in the drawing, that is one end of thewinding 2 which is in opposition to the other end CP of thesame winding 2 to which the other or lower end of the winding 1 is connected. Ayoke 7 is provided substantially to surround thewindings 1 and 2, and a block core 8, which is constituted by a plurality of blocks, is provided coaxially with thewindings 1 and 2.Reference numeral 9 designates a minute gap between adjacent blocks. - In such a reactor of the iron-core type provided with a gap, 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 t can be obtained by multiplying the length Δℓ1 of each of the
minute gaps 9 by the number n of thegaps 9. That is, assuming that the effective sectional area of magnetic flux is represented by Sconst' the number of turns of the winding 1 is represented by N1' and the number of turns of thewinding 2 is represented by N2', in the embodiment of Fig. 5, a first inductance value of the reactance when theterminals terminals 3 and 5:terminals - Thus, three kinds of inductance values L1, L2 and L3 can be obtained in a single reactor, in the same manner as the first embodiment.
- Referring to Fig. 6, the
windings 1 and 2 are wound in the opposite direction to each other differing from the first and second embodiments, while thewindings 1 and 2 are disposed coaxially. In this arrangement, the series connection between thewindings 1 and 2 may be performed by connecting the respective lower ends of thewindings 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. In this embodiment, theterminal 5 is provided at the upper end of thewinding 2 as seen in the drawing. Although 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 - 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 - It is a matter of course that the number of the coaxially disposed windings is not limited to two or three but can be selected to four or more.
- In each of the embodiments described above, 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 L1 and L2, and that a current II flows only in the winding 1 when the inductance value L1 while current I2 flows in the
windings 1 and 2 when the inductance value L2 is selected. The current I2 is smaller than the current I1. Accordingly, it is not necessary to set the sectional area Sb of thewinding 2 to a value corresponding to the current I1, that is to a value as large as the sectional area Sa of the winding 1. The sectional area Sb may be set to a value not smaller than that obtained by the following equation (8):winding 2 is reduced to the value obtained in the equation (8), the more the conductor material can be reduced. - Although the advantage in reduction of conductor material has been described above in connection with the first embodiment, the similar advantage in reduction of conductor material can be obtained in other embodiments. Furthermore, although the windings of cylindrical form are applied to the embodiments shown in Figs. 2 to 7, square pillar windings can be applied to the present invention.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2944083A JPS59155910A (en) | 1983-02-25 | 1983-02-25 | Reactor |
JP29440/83 | 1983-02-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0117515A1 true EP0117515A1 (en) | 1984-09-05 |
EP0117515B1 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 (en) |
JP (1) | JPS59155910A (en) |
DE (1) | DE3463704D1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001061715A1 (en) * | 2000-02-17 | 2001-08-23 | Koninklijke Philips Electronics N.V. | Magnetic component |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0832171B2 (en) * | 1990-02-14 | 1996-03-27 | 株式会社村田製作所 | Multi-output switching regulator |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB364200A (en) * | 1930-01-25 | 1932-01-07 | Siemens Ag | Improvements in choking coils for heavy current networks |
CA614443A (en) * | 1961-02-14 | J. Mackinnon Lloyd | Electrical reactor | |
DE1151869B (en) * | 1960-07-11 | 1963-07-25 | Licentia Gmbh | Coreless high-voltage choke coil with magnetically conductive yokes |
GB1005120A (en) * | 1962-12-07 | 1965-09-22 | Smit & Willem & Co Nv | Improvements in and relating to chokes for high tension and high power |
CH539936A (en) * | 1971-01-19 | 1973-07-31 | Viszek Villamosipari Szolgalta | Choke coil with iron core |
-
1983
- 1983-02-25 JP JP2944083A patent/JPS59155910A/en active Pending
-
1984
- 1984-02-21 EP EP19840101816 patent/EP0117515B1/en not_active Expired
- 1984-02-21 DE DE8484101816T patent/DE3463704D1/en not_active Expired
Patent Citations (5)
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 (en) * | 1960-07-11 | 1963-07-25 | Licentia Gmbh | Coreless high-voltage choke coil with magnetically conductive yokes |
GB1005120A (en) * | 1962-12-07 | 1965-09-22 | Smit & Willem & Co Nv | Improvements in and relating to chokes for high tension and high power |
CH539936A (en) * | 1971-01-19 | 1973-07-31 | Viszek Villamosipari Szolgalta | Choke coil with iron core |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001061715A1 (en) * | 2000-02-17 | 2001-08-23 | Koninklijke Philips Electronics N.V. | Magnetic component |
US6417753B1 (en) | 2000-02-17 | 2002-07-09 | Koninklijke Philips Electronics N.V. | Planar magnetic device without center core leg |
Also Published As
Publication number | Publication date |
---|---|
DE3463704D1 (en) | 1987-06-19 |
JPS59155910A (en) | 1984-09-05 |
EP0117515B1 (en) | 1987-05-13 |
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