EP0216500A1 - Elektromagnetischer Induktionsapparat - Google Patents

Elektromagnetischer Induktionsapparat Download PDF

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Publication number
EP0216500A1
EP0216500A1 EP86306422A EP86306422A EP0216500A1 EP 0216500 A1 EP0216500 A1 EP 0216500A1 EP 86306422 A EP86306422 A EP 86306422A EP 86306422 A EP86306422 A EP 86306422A EP 0216500 A1 EP0216500 A1 EP 0216500A1
Authority
EP
European Patent Office
Prior art keywords
winding
transformer
tap
electromagnetic induction
reactor
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.)
Granted
Application number
EP86306422A
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English (en)
French (fr)
Other versions
EP0216500B1 (de
Inventor
Kentaro C/O Ako Works Taninouchi
Katsuji C/O Ako Works Sokai
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.)
Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
Publication date
Priority claimed from JP5811186A external-priority patent/JPS62122113A/ja
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0216500A1 publication Critical patent/EP0216500A1/de
Application granted granted Critical
Publication of EP0216500B1 publication Critical patent/EP0216500B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings

Definitions

  • This invention relates to an electromagnetic induction apparatus which comprises a transformer and which is utilized for power transmission and distribution systems, etc., and more particularly to an electromagnetic induction apparatus which does not require the installation of a shunt reactor.
  • Fig. 20 is a circuit diagram showing the single-line connection state of a substation which employs and electromagnetic induction apparatus comprising a transformer as has heretofore been utilized in a power transmission or distribution system
  • Fig. 21 is a perspective view showing a practical construction in the case where the circuit in Fig. 20 is three phases.
  • a primary side switching device 2 is connected to the primary winding la, a primary side transmission or distribution line 3 has one end connected to the primary side switching device 2 and the other end connected to an external circuit (not shown), and a capacitance 4 is formed between the primary side transmission or distribution line 3 and ground.
  • a secondary side switching device 5 is connected to the secondary winding lb, a secondary side transmission or distribution line 6 has one end connected to the secondary side switching device 5 and the other end connected to an external circuit (not snown), and a capacitance 7 is formed between the secondary side transmission or distribution line 6 and ground.
  • a tertiary side switching device 8 is connected to the tertiary winding lc, and a shunt reactor 9 has one end connected to the tertiary side switching device 8 and the other end grounded or which is star- or delta-connected in three phases. The flows 10 and 11 of "leading" reactive powers are supplied from the shunt reactor 9 to the respective capacitances 4 and 7 when the switching devices 2, 5 and 8 are closed.
  • the switching devices 2, 5 and 8 are closed, so that the "leading" reactive powers are supplied from the shunt reactor 9 through the transformer 1 to the capacitance 4 of the primary side transmission or' distribution line 3 and the capacitance 7 of the secondary side transmission or distribution line 6 respectively as indicated by the arrows 10 and 11.
  • the switching devices 2, 5 and 8 are opened, and the transformer 1 and the shunt reactor 9 are separated from the power system.
  • Fig. 22 is a circuit diagram showing the single-line connection state of another prior-art example
  • wnile Fig. 23 is a perspective view showing a practical construction in the case where the circuit in Fig. 22 is used in three phases.
  • Symbols 2 - 7 denote the same constituents as those shown in Figs. 20 and 21.
  • a transformer 20 has a primary winding 20a and a secondary winding 20b, a switching device 12 on the primary side is connected to the primary side transmission or distribution line 3, and a shunt reactor 13 on the primary side has one end connected to the switching device 12 and the other end grounded or which is star- or delta-connected in three phases.
  • a switching device 14 on the secondary side is connected to the secondary side transmission or distribution line 6, and a shunt reactor 15 on the secondary side has one end connected to the switching device 14 and the other end grounded or which is star-or delta-connected in three phases.
  • the flows 16 and 17 of "leading" reactive powers are respectively supplied from the shunt reactors 13, 15 through the switching devices 12, 14 to tne capacitances 4, 7 wnen the switching devices 12, 14 are closed.
  • the switching devices 2, 5, 12 and 14 are closed, so that the "leading" reactive powers are supplied from the shunt reactors 13 and 15 througn the corresponding transmission or distribution lines 3 and 6 to the respective capacitances 4 and 7 as indicated by tne arrows 16 and 17.
  • the switching devices 2, 5, 12 and 14 are opened, and the transformer 20 and the shunt reactors 13, 15 are separated from the power system.
  • the transmission or distribution lines 3 and 6 are overhead lines of long distances or where they are constructed of cables even when they are of short distances, they have great capacitances 4 and 7, wnich consume "leading" reactive powers.
  • the supply of the reactive powers from a power station (not shown) in a remote place results in inflicting heavy power losses on the power transmission or distribution system and spoiling the stability of this system.
  • the "leading" reactive powers which the transmission or distribution lines 3 and 6 require are supplied from the substation near these lines 3 and 6 by disposing the phase modifying means, namely, the shunt reactor 9 or shunt reactors 13, 15 as shown in Figs. 20 - 23.
  • Fig. 24 is an equivalent circuit diagram of the transformer 20 having the two windings as shown in Fig. 22, and Fig. 26 is a horizontal partial sectional view of the transformer 20.
  • 21 indicates the primary side terminal of the transformer 20, 22 the secondary side terminal of the transformer 20, 23 a magnetic space defined between the primary winding 20a and the secondary winding 20b, 24 a leakage flux generated in the space 23 by the primary winding 20a and the secondary winding 20b, X the leakage reactance of the transformer 20 induced by the leakage flux 24, r the winding resistance of the transformer 20, and Zm the excitation impedance of the transformer 20.
  • the winding resistance r can be neglected as it is sufficiently small, and the excitation impedance Zm can be regarded as being infinitely large, so that the equivalent circuit in Fig. 24 is simplified as shown in Fig. 25. Accordingly, the shunt reactors (reactances connected in parallel with the power transmission or distribution system) do not exist equivalently.
  • the equivalent circuit of the transformer 20 is expressed by only the leakage reactance X as shown in Fig. 25, so that the connection of the respective transmission or distribution lines 3 and 6 to the terminals 21 and 22 corresponds to connecting "a reactor whose reactance is X" in series with the power transmission or distribution system.
  • 25 indicates the primary side terminal of the transformer 1, 26 the secondary side terminal thereof, and 27 the tertiary side terminal thereof.
  • the prior-art electromagnetic induction apparatus in the substation is equipped with the shunt reactor 9 or shunt reactors 13, 15 as the phase modifying means for compensating the "leading" reactive powers which are consumed by the capacitances 4, 7 between the respective transmission or distribution lines 3, 6 and ground. Therefore, it has nad several problems to be explained below:
  • This invention has been made in crder to solve all the problems as mentioned above, and has for its object the provision of an electromagnetic induction apparatus which is so constructed as to have the function of supplying "leading" reactive powers without the installation of a shunt reactor, thereby to reduce the space and to lower the power loss.
  • Another ooject of this invention is to make the capacity of an equivalent shunt reactor which functions to supply "leading" reactive powers variable.
  • An electromagnetic induction apparatus comprises a short-circuit winding which is electromagnetically coupled to at least two windings.
  • An electromagnetic induction apparatus in another aspect of performance of this invention comprises a reactor winding which is electromagnetically coupled to at least two windings including a tap winding and which is inserted between one end of the tap winding and a tap.
  • two windings operate as an ordinary transformer, while a leakage flux appears in the magnetic space between the two windings and a short-circuit winding, and it equivalently functions as a shunt reactor, to supply "leading" reactive powers to transmission or distribution lines and capacitances.
  • a tap voltage whicn is lower than tne open-circuit voltage of a reactor winding is forcibly applied from a tap to the reactor winding, to generate a desired magnitude of leakage flux between the reactor winding and a tap winding.
  • Fig. 1 is a circuit diagram in a single-line connection state showing the embodiment of this invention as a transformer which has, for example, three windings
  • Fig. 2 is a perspective view showing a practical construction corresponding to Fig. 1
  • Fig. 3 is a horizontal partial sectional view corresponding to Fig. 2
  • Fig. 4 is a circuit diagram showing in a single-line connection state a case where the transformer in Fig. 1 is applied to a substation
  • Fig. 5 is a perspective view showing a case where tne circuit in Fig. 4 is used in three phases
  • Fig. 6 is an equivalent circuit diagram corresponding to Fig. 1, Fig.
  • FIG. 7 is a perspective view showing an embodiment in which the transformer is constructed of a core type transformer
  • Fig. 8 is a horizontal partial sectional view showing an embodiment in which a magnetic space is formed of a gapped core
  • Fig. 9 is a circuit diagram showing a single-line connection state in the case wnere an embodiment having a switching device added to a short-circuit winding is applied to a substation
  • Fig. 10 is a perspective view showing a case where the circuit in Fig. 9 is used in three phases
  • Figs. 11 and 12 are horizontal partial sectional views respectively showing the states in which the switching device in Fig. 9 is opened and closed.
  • la-lc, 2-7, 10 and 11 indicate the same portions as in the prior art examples stated before, and 1A indicates a transformer corresponding to the transformer 1.
  • the core of the transformer 1A is denoted by ld and S is a short-circuit line which short-circuits both the ends of the tertiary winding lc and due to which the tertiary winding lc becomes a short-circuit winding.
  • a leakage flux 18 is induced between the tertiary winding lc and the primary winding la or secondary winding lb by the short-circuit current of the tertiary winding lc, and tnougn not shown, such a leakage flux is also generated between the primary winding la and the secondary winding lb.
  • the leakage flux 18 passes through a magnetic space 19 which is illustrated only between the secondary winding lb and the tertiary winding lc nere.
  • a switching device 29 added to the short-circuit line S may well be connected between one end of the tertiary winding lc and ground by leading the terminal of the tertiary winding lc out of the transformer 1A as shown in Fig. 9, or between the lines of the tertiary winding connected in three phases.
  • a power source V 0 such as a power station (not shown) or the like is connected to the primary winding la, and a magnetic flux 18A is generated in the core ld by the power source V 0 when the switching device 29 has been opened.
  • the tertiary winding lc falls into an unshorted state, and a snunt reactor function vanishes.
  • the switcning device 29 is closed as depicted in Fig. 12
  • the tertiary winding lc serves as the short-circuit winding and gives rise to the shunt reactor function, quite similarly to the state in which the short-circuit line S is provided as illustrated in Figs. 1 and 2. That is, the supply of the "leading" reactive powers 10, 11 can be on-off-controlled as is necessary by means of the switching device 29.
  • the power source V 0 of the power station (not shown) is connected to the primary winding la to excite the transformer lA.
  • the magnetic flux 18A is generated in the core ld and interlinks with the primary winding la, secondary winding 1b and tertiary winding lc in common.
  • voltages proportional, to the numbers of turns of the respective windings are generated across the primary winding la, secondary winding lb and tertiary winding lc. That is, in the state of Fig.
  • the output terminals of the secondary winding lb are connected to the external circuit (not shown), thereby to operate as the output terminals of the ordinary transformer.
  • the tertiary winding lc since the tertiary winding lc is in the open state, it is merely generating the voltage. Accordingly, no current flows through the tertiary winding lc, and the tertiary winding lc is not supplying electric power externally.
  • magnetic energy Q is generated in the magnetic space 19, and the value thereof is expressed by" where f denotes the frequency of the power source V 0 , B the flux density of the magnetic space 19 and V the volume of the magnetic space 19.
  • a short-circuit current 1 3 of a magnitude establishing a magnetic field of the flux density B in the magnetic space 19 flows through the tertiary winding lc.
  • currents I 1 and I 2 satisfying the following flow through the primary winding la and the secondary winding 2b in accordance with a transformer operation: where N 1 : number of returns of the primary winding la,
  • the leakage flux 18 functions equally to the shunt reactor(s) 9 or 13, 15 in tne prior-art examples shown in Figs. 20 to 23 and supplies the "leading" reactive powers 10, 11 to the capacitances 4, 7 of the primary side and secondary side transmission or distribution lines 3, 6 as shown in Figs. 4, 5, 9 and 10.
  • the leakage flux 24 appears also in the two-winding transformer 20 or three-winding transformer 1 of the prior-art construction. As illustrated in the equivalent circuit of Fig. 25 or 27, however, the leakage reactance functions as the series reactance which is connected in series with the circuit.
  • tne equivalent circuit of the transformer 1A with tne tertiary winding lc short-circuited is expressed as in Fig. 6.
  • 25-27 and X 1 -X 3 are the same as in Fig. 27.
  • the reactance X 3 on the tertiary side functions as a parallel reactance which is connected in parallel with the circuit. That is, connecting the primary side transmission or distribution line 3 and the secondary side transmission or distribution line 6 to the primary side terminal 25 and tne secondary side terminal 26 respectively corresponds to connecting "a shunt reactor whose reactance has the magnitude 1 3 " in parallel with the power transmission or distribution system. This signifies nothing but the fact that the magnetic space 19 shown in Figs. 3 and 12 functions physically as the magnetic space of the shunt reactor in the prior art.
  • the two-winding transformer when it is further provided with the tertiary winding lc which is electromagnetically coupled to the primary winding la and the secondary winding lb, it becomes identical to the construction of the three-winding transformer 1A and can also be operated similarly to the shunt reactor.
  • the three-winding transformer 1A with both the ends of the tertiary winding lc short-circuited functions also as the shunt reactor whose reactance has the magnitude X 3 , without spoiling the original voltage transformation function of the transformer and can supply the "leading" reactive powers to the capacitances 4, 7 of the transmission or distribution lines 3, 6.
  • the voltage of the tertiary winding lc can be selected at will irrespective of the voltages of the primary transmission cr distribution line 3 and the secondary transmission or distribution line 6. Therefore, when the voltage across the tertiary winding lc is rendered sufficiently low, the transformer 1A need not be especially enlarged.
  • the transformer 1A is constructed as a shell type
  • the transformer may also be constructed with a core type one as shown in Fig. 7.
  • a gapped-core structure may well be adopted by interposing a gapped core 28 as shown in Fig. 8.
  • transformer 1A of the three windings has been explained as an example, it is needless to say that, even when the invention is applied to a transformer of four or more windings not shown, an electromagnetic induction apparatus having the same functional effect as stated above can be realized by short-circuiting the tertiary winding.
  • FIG. 13 is a circuit diagram showing the embodiment of another aspect of performance of this invention
  • Fig. 14 is a perspective view showing a practical construction corresponding to Fig. 13
  • Figs. 15 and 16 are horizontal partial sectional views respectively showing the states in which a tertiary winding in Fig. 14 is opened and is connected to a tap.
  • ia-ld, 18 and 19 denote portions similar to those described before
  • 1B denotes a transformer corresponding to the transformer lA.
  • the secondary winding lb is provided with a plurality of taps 30, and owing to wnich the secondary winding lt becomes a tap winding.
  • the tertiary winding lc has one end connected tc one end of the secondary winding l b at a node P and has the other end connected to one of the plurality of taps 30, thereby to become a reactor winding.
  • the primary side transmission or distribution line namely, the power source V 0 of a power station or the like be connected to the primary winding la in the state in which the tertiary winding lc as the reactor winding is open as depicted in F ig. 15.
  • the magnetic flux 18A of a magnitude ⁇ 0 is generated in the core ld and interlinks with the primary winding la, secondary winding lb and tertiary winding lc in common.
  • This state is the same as in the case of Fig. 11.
  • a voltage equal to the supply voltage V 0 is generated across the primary winding la, and voltages according to the numbers of turns N l -N 3 of the respective windings la-lc are generated across the secondary winding lb and tertiary winding lc.
  • the voltages generated across the windings la-lc, denoted by V 10 -V 30 respectively are expressed as follows: wnere K: constant. Accordingly, the secondary winding lb can be used for the ordinary transformer when connected to the secondary side transmission or distribution line, namely, the external circuit. Besides, since the tertiary winding lc is in the open state, it is merely generating the voltage V 30 and does not execute the reactor function at all.
  • one end of the tertiary winding lc is connected to one end of the secondary winding lb through the node P, and the other end of the tertiary winding lc is connected to one of the taps 30, whereby a tap voltage V 3 lower than the open-circuit voltage V 30 as evaluated with Eqs. (3) and (5) is forcibly applied to the tertiary winding lc.
  • the magnitude ⁇ of the magnetic flux 18B interlinking with the tertiary winding lc becomes a value satisfying the equation: in which V 3 and ⁇ are respectively substituted for V 30 and ⁇ 0 in Eq. (5). Accordingly, holds.
  • the magnitude to of the magnetic flux 18A in the open-circuit condition becomes: in accordance with Eq. (5).
  • the value ⁇ of the magnetic flux 18B upon being connected to the tap is expressed relative to the value ⁇ 0 of the magnetic flux 18A in the open-circuit condition as follows:
  • the leakage flux 18C of the magnitude ⁇ flows through the magnetic space 19, whereby predetermined magnetic energy is generated to effect the shunt reactor function.
  • the value : of the magnetic flux 18B interlinking with the tertiary winding lc varies in proportion to the tap voltage V 3 .
  • the value ⁇ of the leakage flux 18C flowing through the magnetic space 19 changes simultaneously, so that the magnitude of the magnetic energy of the magnetic space 19 changes to change the capacity cf the shunt reactor.
  • the state in which the tap voltage V 3 is rendered zero is the same as tne case illustrated in Fig. 12.
  • the value ⁇ 0 of the magnetic flux 18A in the open-circuit condition flows entirely to the magnetic space 19 upon being connected to the tap and the capacity of the shunt reactor becomes the maximum.
  • an electromagnetic induction apparatus comprising a shunt reactor of variable capacity can be realized even with a transformer of four or more windings by using one of the windings as a reactor winding and another as a tap winding.
  • a changer 31 for changing the taps 30 in an on-load condition may well be disposed between the other end of the tertiary winding lc and the taps 30 as shown in a circuit diagram of Fig. 17.
  • the change of the taps 30, in other words, tne alteration cf the capacity of the shunt reactor can be performed in the energized state.
  • the magnetic space 19 through which the leakage flux 18C passes has been illustrated as the air-core structure as depicted in Fig. 16, it may well be a gapped-core structure with a gap core 28 interposed therein as depicted in Fig. 18.
  • transformer 1B as the electromagnetic induction apparatus has been illustrated as the shell type transformer, it may well be a core type one as shown in Fig. 19.
  • a short-circuit winding which is electromagnetically coupled to at least two windings is disposed.
  • a reactor winding whicn is electromagnetically coupled to at least two windings, one being a tap winding, and whicn is connected between one end of the tap winding and a tap is disposed, and the difference flux of respective magnetic fluxes appearing when tne reactor winding is opened and is connected to the tap is generated in a magnetic space.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP86306422A 1985-08-19 1986-08-19 Elektromagnetischer Induktionsapparat Expired - Lifetime EP0216500B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP180489/85 1985-08-19
JP18048985 1985-08-19
JP58111/86 1986-03-18
JP5811186A JPS62122113A (ja) 1985-08-19 1986-03-18 電磁誘導機器

Publications (2)

Publication Number Publication Date
EP0216500A1 true EP0216500A1 (de) 1987-04-01
EP0216500B1 EP0216500B1 (de) 1992-06-03

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EP86306422A Expired - Lifetime EP0216500B1 (de) 1985-08-19 1986-08-19 Elektromagnetischer Induktionsapparat

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2827073A1 (fr) * 2001-07-06 2003-01-10 Aristide Polisois Transformateur electrique a flux reduit
FR2881266A1 (fr) * 2005-01-27 2006-07-28 Areva T & D Sa Transformateur pour vehicule moteur multicourant
WO2007133169A1 (en) * 2006-05-12 2007-11-22 Great Man Made River Co. For Reclamation And Construction Description electro-ageeb electrical safety device
EP3267444A1 (de) * 2016-07-06 2018-01-10 Tamura Corporation Transformator und schaltnetzteilvorrichtung
EP3267445A1 (de) * 2016-07-06 2018-01-10 Tamura Corporation Transformator und schaltnetzteilvorrichtung
US20180013350A1 (en) 2016-07-05 2018-01-11 Tamura Corporation Transformer and switched-mode power supply apparatus
US10262789B2 (en) 2016-07-05 2019-04-16 Tamura Corporation Transformer and switched-mode power supply apparatus

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191105190A (en) * 1911-03-01 1912-02-29 Arthur Francis Berry Improvements in or relating to Electrical Transformers.
FR488384A (fr) * 1917-01-26 1918-09-24 Westinghouse Electric Corp Bobines tertiaires pour transformateurs
FR45888E (fr) * 1935-03-04 1935-12-27 Fr De Materiel Electr Soc Perfectionnements apportés aux postes de transformateurs électriques
US2221619A (en) * 1939-12-28 1940-11-12 Westinghouse Electric & Mfg Co Electrical induction apparatus
FR891965A (fr) * 1942-03-09 1944-03-24 Licentia Gmbh Transformateur à haute tension, bobine de self ou transformateur de mesure
CH306155A (de) * 1951-08-24 1955-03-31 Bbc Brown Boveri & Cie Leistungstransformator mit einer Einrichtung zur Blindleistungskompensation.
GB1244219A (en) * 1967-08-24 1971-08-25 Licentia Gmbh Inductive devices for compensating capacitive currents
FR2290012A1 (fr) * 1974-10-25 1976-05-28 Smit Nijmegen Bv Systeme de transformateurs polyphase reglable pour le couplage de deux reseaux de distribution electriques
EP0149169A2 (de) * 1984-01-13 1985-07-24 BBC Aktiengesellschaft Brown, Boveri & Cie. Stromrichtertransformator

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191105190A (en) * 1911-03-01 1912-02-29 Arthur Francis Berry Improvements in or relating to Electrical Transformers.
FR488384A (fr) * 1917-01-26 1918-09-24 Westinghouse Electric Corp Bobines tertiaires pour transformateurs
FR45888E (fr) * 1935-03-04 1935-12-27 Fr De Materiel Electr Soc Perfectionnements apportés aux postes de transformateurs électriques
US2221619A (en) * 1939-12-28 1940-11-12 Westinghouse Electric & Mfg Co Electrical induction apparatus
FR891965A (fr) * 1942-03-09 1944-03-24 Licentia Gmbh Transformateur à haute tension, bobine de self ou transformateur de mesure
CH306155A (de) * 1951-08-24 1955-03-31 Bbc Brown Boveri & Cie Leistungstransformator mit einer Einrichtung zur Blindleistungskompensation.
GB1244219A (en) * 1967-08-24 1971-08-25 Licentia Gmbh Inductive devices for compensating capacitive currents
FR2290012A1 (fr) * 1974-10-25 1976-05-28 Smit Nijmegen Bv Systeme de transformateurs polyphase reglable pour le couplage de deux reseaux de distribution electriques
EP0149169A2 (de) * 1984-01-13 1985-07-24 BBC Aktiengesellschaft Brown, Boveri & Cie. Stromrichtertransformator

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2827073A1 (fr) * 2001-07-06 2003-01-10 Aristide Polisois Transformateur electrique a flux reduit
FR2881266A1 (fr) * 2005-01-27 2006-07-28 Areva T & D Sa Transformateur pour vehicule moteur multicourant
WO2006079744A1 (fr) * 2005-01-27 2006-08-03 Areva T & D Sa Transformateur pour vehicule moteur multicourant
EP1841616B1 (de) 2005-01-27 2016-12-21 Alstom Grid SAS Transformator für mehrfachstromfahrzeug
WO2007133169A1 (en) * 2006-05-12 2007-11-22 Great Man Made River Co. For Reclamation And Construction Description electro-ageeb electrical safety device
GB2452203A (en) * 2006-05-12 2009-02-25 Great Man Made River Co For Re Description electro-ageeb electrical safety device
US20180013350A1 (en) 2016-07-05 2018-01-11 Tamura Corporation Transformer and switched-mode power supply apparatus
US10249430B2 (en) 2016-07-05 2019-04-02 Tamura Corporation Transformer and switched-mode power supply apparatus
US10262789B2 (en) 2016-07-05 2019-04-16 Tamura Corporation Transformer and switched-mode power supply apparatus
EP3267444A1 (de) * 2016-07-06 2018-01-10 Tamura Corporation Transformator und schaltnetzteilvorrichtung
EP3267445A1 (de) * 2016-07-06 2018-01-10 Tamura Corporation Transformator und schaltnetzteilvorrichtung

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