US1719892A - Transformer for feeding polyphase rectifiers - Google Patents

Transformer for feeding polyphase rectifiers Download PDF

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Publication number
US1719892A
US1719892A US53372922A US1719892A US 1719892 A US1719892 A US 1719892A US 53372922 A US53372922 A US 53372922A US 1719892 A US1719892 A US 1719892A
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US
United States
Prior art keywords
transformer
legs
groups
feeding
rectifiers
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 - Lifetime
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English (en)
Inventor
Kubler Johann
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.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
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 Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US1719892A publication Critical patent/US1719892A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/068—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
    • 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
    • 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
    • H01F30/12—Two-phase, three-phase or polyphase transformers

Definitions

  • the secondaryavindings of the several transform ers may have a common neutralpoint, while the primary windings may each be differently connected to produce the desired rotation oft-he secondary phases.
  • the primary winding of one transformer may be star-connected, that of the second transformer may be delta-connected, and that of the third transformer-may be connected in zig-zag, and so on.
  • the numher-of the primary connections varies with the number of the desired secondary phases.
  • each transformer core which constitutes a closed circuit with respect to the fundamental frequency currents flowing therein, is thus only a part of an open mag? netic circuit with respect to the harmonic currents. Consequently, the choking field induced by the harmonics will be relatively weak and large harmonic currents will, as a result, circulate in the transformer.
  • a strong choking of the higher currents could be produced by the use of a fourth unwound core for closing the magnetic circuit that is open as regards the higher third harmonic, so that a strong higher harmonic field can be formed.
  • a fourth leg increases considerably the quantity of material required for, and also the cost of manufacture of, the transformer, es-
  • a magnetic return circuit for the higher harmonic fields is provided by a combination of the several transformers into a single transformer having a. greater number. of legs;
  • the invention has thus for its object the provision of an improved transformer for feeding polyphase rectifiers from a trlphase supply circuit, having as'rts chief characteristics a plurality of wound legs equal in number to a multiple of the number three and the arrangement of the legs in groups of three, with the windings thereon so connected that the magnetic fluxes corresponding to the higher third waves of one group will find a closed iron path in the core legs and yokesof different groups.
  • Fig. 1 being for In'the drawing N is a triphase. supply circuit; 1, 2, 3 are the the'transform'er; g
  • a, b, 0, (Z1, 6, f, are the primary windings
  • the two groups of legs I, II, III and IV, V, VI have the two common yo-kes j, and j, in common.
  • the higher harmonic ampere turns comprised in each single groupof legs have a common direction whereas, also viewed from the same point, the ampere turns in one group are directed oppositely from those in the other group, so that they have a completely closed magnetic circuit that is composed of the parallel legs I, II, III, the yoke j,, the parallel legs IV, V, VI and the yoke j ly the magnetic field of the third harmonic can develop to its full strength, and eifective- 1y choke the higher harmonic currents.
  • a transformer for feeding polyphas rectifiers from a three-phase supply circuit including six core legs, arranged in groups ofthree, yokes common to said legs, a threephase primary winding on each of said groups arranged as a one-phase winding on each leg, and a secondary winding on eachof said legs, the groups of primary windings being so arranged that the E, M. 'F.s of the Consequentwindings which are connected to the same main phase are in phase opposition, respectively to the same yoke, all the secondary windings being connected in symmetrical star connection, the free, ends of said second ary windings being adapted to be'connected to the respective anodes of a rectifier.
  • a plurality of polyphase transformer groups each of saidrgroups having a core portion constituting in itself a substantially closed magnetic circuit with respect to the fundamental alternating currents, and a substantially open circuit with respect to certain harmonic currents'tending to flow therein, the individual groups being so connected with each of said groups and constituting a:
  • the core means of each of said groups constituting portions of an open magnetic circuit with respect to higher harmonics tending to V flow in the associated windings, the cores of the individual transformer groups and the associated windings being so connected that the incomplete magnetic circuit for the higher harmonics of one group is closed circuited by the magnetic circuit of another group.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
US53372922 1921-02-18 1922-02-02 Transformer for feeding polyphase rectifiers Expired - Lifetime US1719892A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1719892X 1921-02-18

Publications (1)

Publication Number Publication Date
US1719892A true US1719892A (en) 1929-07-09

Family

ID=4566025

Family Applications (1)

Application Number Title Priority Date Filing Date
US53372922 Expired - Lifetime US1719892A (en) 1921-02-18 1922-02-02 Transformer for feeding polyphase rectifiers

Country Status (3)

Country Link
US (1) US1719892A (de)
CH (1) CH94755A (de)
FR (1) FR547382A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5070441A (en) * 1990-12-24 1991-12-03 Ashley James R Distribution of power from a six phase powerline to one- and three- phase loads
US5343080A (en) * 1991-11-15 1994-08-30 Power Distribution, Inc. Harmonic cancellation system
US5434455A (en) * 1991-11-15 1995-07-18 Power Distribution, Inc. Harmonic cancellation system
US11450477B2 (en) * 2020-03-31 2022-09-20 Karma Automotive Llc Phase-shift autotransformer, multi-pulse rectifier systems and fast charging

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5070441A (en) * 1990-12-24 1991-12-03 Ashley James R Distribution of power from a six phase powerline to one- and three- phase loads
US5343080A (en) * 1991-11-15 1994-08-30 Power Distribution, Inc. Harmonic cancellation system
US5434455A (en) * 1991-11-15 1995-07-18 Power Distribution, Inc. Harmonic cancellation system
US11450477B2 (en) * 2020-03-31 2022-09-20 Karma Automotive Llc Phase-shift autotransformer, multi-pulse rectifier systems and fast charging

Also Published As

Publication number Publication date
CH94755A (de) 1922-05-16
FR547382A (fr) 1922-12-09

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