Variable transformer, reactor and method of their control
First Claim
1. In a transformer, the combination comprising:
- core means combining at least two complete core elements with at least one core yoke common for both said core elements;
primary winding means including at least two phase sets of independently fed coils with each phase set having at least one coil wound in the direction opposite to the associated coil of other set, carried by symmetrical core legs of each said core elements and separated by said common yoke;
secondary winding means including at least one phase set having at least one coil with at least two coil portions wound in opposite direction, carried by said symmetrical core legs of each said core elements and separated by said common yoke;
means for applying power to said primary winding phase sets including means for selectively controlling the application of power to at least one said phase set relatively to the other for enabling control of one of the currents therein and phase shift of the currents therein relative to the other said phase set to control operating parameters of said transformer.
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Abstract
A variable transformer, reactor having a core combining at least two complete core elements wiht a common yoke; primary winding divided into two independently fed sets of phase coils wound in opposite direction, arranged on symmetrical legs of core elements and separated by the common yoke; secondary winding with each phase coil divided into two wound in opposite direction portions carried by symmetrical core legs, adjacent to the primary coils and separated by common yoke. The secondary short-circuited reactor winding is reduced to at least one close loop member with loop portions separated by the common yoke. The single, polyphase apparatus has at least one primary coil per set that includes a controllable device in circuit relation therewith to enable control of one primary coil relative to the other, either in current magntidue or in current phase shift. The controllable device being either a silicon control rectifier, triac or transistor. By continuous control of the controllable device an apparatus variable output parameters are obtained.
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Citations
37 Claims
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1. In a transformer, the combination comprising:
- core means combining at least two complete core elements with at least one core yoke common for both said core elements;
primary winding means including at least two phase sets of independently fed coils with each phase set having at least one coil wound in the direction opposite to the associated coil of other set, carried by symmetrical core legs of each said core elements and separated by said common yoke; secondary winding means including at least one phase set having at least one coil with at least two coil portions wound in opposite direction, carried by said symmetrical core legs of each said core elements and separated by said common yoke; means for applying power to said primary winding phase sets including means for selectively controlling the application of power to at least one said phase set relatively to the other for enabling control of one of the currents therein and phase shift of the currents therein relative to the other said phase set to control operating parameters of said transformer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15)
- core means combining at least two complete core elements with at least one core yoke common for both said core elements;
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10. The combination according to claim3 wherein said control device means includes at least one silicon controlled rectifier.
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16. In a transformer, the combination comprising:
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core means formed of at least two complete core elements with at least one, common for both said core elements, core yoke for carrying at least two independently established magnetic fluxes; primary winding means including at least two phase sets of independently fed, oppositely disposed, carried by symmetrical core legs, and separated by said common yoke coils for independently establishing at least two magnetic fluxes; secondary winding means including at least one phase set having at least one coil with at least two oppositely disposed portions, carried by said symmetrical core legs, and separated by said common yoke, wherein said coil compounds elecromotive forces induced in said coil portions linked by said fluxes; means for applying power to said primary winding phase sets including (a) means for applying power to said at least one phase coil of one of said phase sets and (b) means for controlling the application of power to the other said, at least one, phase coil of the other said phase set for enabling control of at least one of (i) the current therein relative to the other said at least one phase coil and (ii) the phase shift of the current therein relative to the other said, at least one, phase coil for controlling the operating parameters of said transformer. - View Dependent Claims (17, 18, 19)
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20. A method for controlling the output parameters of a transformer comprising the steps of:
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(a) independently establishing at least two magnetic fluxes in said transformer core carring at least two primary phase coils; (b) linking said fluxes by at least one secondary phase coil having at least two portions; (c) compounding by said secondary coil electromotive forces induced in said coil portions, linked by said fluxes; (d) varying a sum of said electromotive forces by shifting a relative phase and a magnitude of said fluxes, and currents producing said fluxes; (e) controlling said relative phase and magnitude of said currents by varying firing angle of controllable semiconductor devices installed in circuit relation with at least one of said primary phase coils.
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21. In a reactor, the combination comprising:
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core means formed of at least two complete core elements with at least one, common for both said core elements, core yoke for carrying at least two independently established magnetic fluxes; primary winding means including at least two phase sets of independently fed, oppositely disposed, carried by symmetrical core legs, separated by said common yoke coils for independently establishing at least two magnetic fluxes; secondary winding means including at least one phase set having at least one short-circuited coil with at least two oppositely disposed portions, carried by said symmetrical core legs, and separated by said common yoke, wherein said coil compounds elecromotive forces induced in said coil portions linked by said fluxes; means for applying power to said primary winding phase sets including (a) means for applying power to said at least one phase coil of one of said phase sets and (b) means for controlling the application of power to the other said, at least one, phase coil of the other said phase set for enabling control of at least one of (i) the current therein relative to the other said at least one phase coil and (ii) the phase shift of the current therein relative to the other said, at least one, phase coil for controlling the operating parameters of said reactor. - View Dependent Claims (22, 23, 24, 25)
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26. A method for controlling the impedance of a reactor comprising the steps of:
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(a) independently establishing at least two magnetic fluxes in said reactor core carring at least two primary phase coils; (b) linking said fluxes by at least one secondary short-circuited phase coil having at least two portions; (c) compounding by said secondary coil electromotive forces induced in said coil portions, linked by said fluxes; (d) varying a sum of said electromotive forces by shifting a relative phase and a magnitude of said fluxes, and currents producing said fluxes; (e) controlling said relative phase and magnitude of said currents by varying firing angle of controllable semiconductor devices installed in circuit relation with at least one of said primary phase coils.
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27. In a reactor, the combination comprising:
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core means combining at least two complete core elements with at least one core yoke common for both said core elements; primary winding means including at least two phase sets of independently fed coils with each phase set having at least one coil wound in direction opposite to the coil of other set and carried by symmetrical core legs separated by said common yoke; secondary winding means including at least one phase short-circuited coil having at least two coil portions wound in opposite direction, carried by symmetrical core legs of each core element and separated by said common yoke; means for applying power to said primary winding phase sets including means for selectively controlling the application of power to at least one said set relatively to the other for enabling control of one of the current therein and phase shift of the current therein relative to the other said phase set to control operating parameters of said reactor. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 36, 37)
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35. The combination according to claim27 wherein said means for selectively controlling the application of power includes controllable semiconductor device means.
Specification