GB423618A - Improvements in and relating to electric transformers and choking coils - Google Patents
Improvements in and relating to electric transformers and choking coilsInfo
- Publication number
- GB423618A GB423618A GB29576/33A GB2957633A GB423618A GB 423618 A GB423618 A GB 423618A GB 29576/33 A GB29576/33 A GB 29576/33A GB 2957633 A GB2957633 A GB 2957633A GB 423618 A GB423618 A GB 423618A
- Authority
- GB
- United Kingdom
- Prior art keywords
- limbs
- coils
- flux
- harmonics
- windings
- 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
Links
Classifications
-
- 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
- H01F27/385—Auxiliary core members; Auxiliary coils or windings for reducing harmonics
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
423,618. Transformers; changing wave form. SIEMENS - SCHUCKERTWERKE AKT.-GES., Siemensstadt,- Berlin. Oct. 25, 1933, No. 29576. Convention date, Oct. 25, 1932. [Class 38 (ii)] [See also Group XXXVI] In arrangements for obtaining a high magnetization output from induction apparatus two or more magnetically saturated three phase choking coils or transformers are connected in series the windings of the choking coils or transformers being arranged in star or zig-zag, and a magnetic short-circuit path for the harmonics of the flux divisible by three being provided. Fig. 1 shows two saturated three phase choking coils 1 and 2 supplied from the mains 3 and so arranged in series in star-zig-zag on a common core structure that the fundamental waves of the fluxes in the aligned limbs of the structure are 30‹ out of phase, and no fifth or seventh harmonics arise in the resulting current or potential. The current taken by the coils 1 and 2 is then of sine form, as is the potential between the lines connecting the coils to the mains 3 while a magnetic short-circuit path, for the harmonics of the flux divisible by three, is provided by the unwound limbs. The flux waves of the coils thus contain a pronounced third harmonic and are substantially rectangular. A high magnetization output of the induction apparatus is thus obtained and the phase potentials of the separate choking coils or transformers contain a marked peak in each half wave, the voltage peaks in windings on any two aligned limbs differing in phase by 30‹. Transformers of this character may therefore be used for controlling the grids of rectifying apparatus &c. In Fig. 3, two sets of series connected choking coils are shown arranged in star-zig-zag, on a common core structure, and so connected to the mains that the fundamental flux waves produced in the two sets are of opposite sign. The harmonics of the flux divisible by three produced in one set are then of opposite sign to those produced in the other set, and additional unwound limbs are therefore not provided. In a modification, series connected polarizing windings supplied with direct current through a variable resistance, are arranged on each limb of the core structure. These windings are arranged to produce a constant flux of the same amount and in the same direction in each of the wound limbs, thereby preventing the formation of even harmonics, and additional unwound limbs are provided to form a return path for this constant flux. In a further modification the two sets of coils are so connected to the mains that their fundamental fluxes have the same sign, the additional unwound limbs providing a return path for the harmonics of the flux divisible by three, while the series connected windings supplied with direct current are arranged on each limb so that the constant fluxes in adjacent limbs are in opposite directions and no even harmonics are produced. An arrangement comprising four choking coils having their windings connected in series and arranged each on a separate set of limbs of a common core structure is described and is stated to permit compensation of all the harmonics up to the 23rd.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE423618X | 1932-10-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB423618A true GB423618A (en) | 1935-02-05 |
Family
ID=6471422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB29576/33A Expired GB423618A (en) | 1932-10-25 | 1933-10-25 | Improvements in and relating to electric transformers and choking coils |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB423618A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2533225A (en) * | 1944-04-05 | 1950-12-12 | Int Standard Electric Corp | Regulated rectifier |
US5182535A (en) * | 1989-12-19 | 1993-01-26 | Dhyanchand P John | Summing transformer core for star-delta inverter having a separate secondary winding for each primary winding |
US5355296A (en) * | 1992-12-10 | 1994-10-11 | Sundstrand Corporation | Switching converter and summing transformer for use therein |
EP3043362A1 (en) * | 2015-01-07 | 2016-07-13 | ABB Technology AG | Voltage-regulation-transformer |
-
1933
- 1933-10-25 GB GB29576/33A patent/GB423618A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2533225A (en) * | 1944-04-05 | 1950-12-12 | Int Standard Electric Corp | Regulated rectifier |
US5182535A (en) * | 1989-12-19 | 1993-01-26 | Dhyanchand P John | Summing transformer core for star-delta inverter having a separate secondary winding for each primary winding |
US5355296A (en) * | 1992-12-10 | 1994-10-11 | Sundstrand Corporation | Switching converter and summing transformer for use therein |
EP3043362A1 (en) * | 2015-01-07 | 2016-07-13 | ABB Technology AG | Voltage-regulation-transformer |
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