DE296839C - - Google Patents
Info
- Publication number
- DE296839C DE296839C DENDAT296839D DE296839DA DE296839C DE 296839 C DE296839 C DE 296839C DE NDAT296839 D DENDAT296839 D DE NDAT296839D DE 296839D A DE296839D A DE 296839DA DE 296839 C DE296839 C DE 296839C
- Authority
- DE
- Germany
- Prior art keywords
- capacitor
- current
- current transformer
- load
- winding
- 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.)
- Active
Links
- 238000004804 winding Methods 0.000 claims description 8
- 230000005415 magnetization Effects 0.000 claims description 7
- 210000003127 Knee Anatomy 0.000 claims description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 10
- 230000001419 dependent Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable Effects 0.000 description 1
Classifications
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- 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
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
- H01F27/422—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers
- H01F27/427—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers for current transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
Description
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
Bei einem Stromwandler kann man bekanntlich dadurch, daß man ihn sekundär mit einem Kondensator belastet, erreichen, daß bei allen Werten der Nutzbelastung der Phasenwinkel zwischen den Vektoren der primären Stromstärke und der sekundären Nutzstromstärke sich dem theoretisch richtigen Werte von i8o° nähert, bei bestimmten Werten der Nutzbelastung ihm sogar genau gleich wird.In the case of a current transformer, as is well known, one can use it secondary with a Capacitor loaded, achieve that at all values of the useful load the phase angle between the vectors of the primary amperage and the secondary useful amperage approaches the theoretically correct value of 180 °, with certain values of the useful load it even becomes exactly the same.
ίο Die dabei im allgemeinen noch bleibenden Abweichungen des Phasenwinkels von i8o° können verringert werden, wenn man den Stromwandler sekundär noch mit einer eisenhaltigen Drosselspule belastet, deren Eisenkern so bemessen ist, daß sie bei voller Nutzbelastung des Stromwandlers über dem Knie der Magnetisierungskurve arbeitet.ίο The ones that remain in general Deviations in the phase angle of 180 ° can be reduced if the Secondary current transformer still loaded with a ferrous choke coil, its iron core is dimensioned so that it is above the knee of the at full load of the current transformer Magnetization curve works.
Um die Wirkung dieser Einrichtung zu erklären, wird zunächst daran erinnert, daß der günstige Einfluß des Kondensators darauf beruht, daß die Magnetisierungskomponente des Leerlaufstromes des Stromwandlers durch die Rückwirkung des Kondensatorstromes auf die Primärwicklung kompensiert wird. Einer der Gründe, aus denen der Kondensator den Phasenwinkel nicht .allgemein auf 180 ° bringen kann, liegt darin, daß die Magnetisierungskomponente des Leerlaufstromes bsi steigenden Werten des wirksamen Feldes im Wandler langsamer wächst wie dies Feld.In order to explain the effect of this device, it is first recalled that the favorable influence of the capacitor is based on the fact that the magnetization component of the No-load current of the current transformer due to the effect of the capacitor current on the Primary winding is compensated. One of the reasons that the capacitor changes the phase angle cannot .generally bring it to 180 ° is that the magnetization component of the no-load current bsi increases Values of the effective field in the converter grows more slowly as this field.
Da nämlich der Kondensatorstrom proportional dem wirksamen Felde wächst, so ist die Kompensation der Magnetisierungskomponente des Leerlaufstromes durch den Kondensatorstrom nur bei einem Werte des wirksamen Feldes möglich.Since the capacitor current increases proportionally to the effective field, so is the compensation of the magnetization component of the no-load current by the capacitor current only possible with one value in the effective field.
Die sekundär angeschlossene, mit hoher Sättigung arbeitende Drosselspule bewirkt nun das Auftreten eines zusätzlichen Leerlaufstromes in der Primärwicklung des Transformators, dessen Magnetisierungskomponente bei steigenden Werten des wirksamen Feldes rascher wächst wie dies Feld. Die Magnetisierungskomponente des ganzen Leerlaufstromes setzt sich dann zusammen aus einem Teil, der langsamer wächst wie das wirksame Feld, und aus einem zweiten Teil, der rascher wächst wie das wirksame Feld. Infolgedessen nähert sich die Beziehung zwischen ihr und dem wirksamen Feld der Proportionalität, also dem Gesetz, das für die vollkommene Wirkung des Kondensators Voraussetzung ist.The secondary connected, high saturation inductor now causes the occurrence of an additional no-load current in the primary winding of the transformer, its magnetization component more rapidly with increasing values of the effective field grows like this field. The magnetization component of the entire no-load current is set is then composed of a part that grows more slowly than the effective field, and from a second part, which grows faster than the active field. As a result, is approaching the relationship between it and the effective field of proportionality, i.e. the Law that is a prerequisite for the capacitor to work perfectly.
Auch für sich allein verwendet, wirkt die angegebene Drosselspule auf die Unveränderlichkeit des Phasenwinkels bei verschiedenen Nutzbelastungen hin; nur ist dann der Phasenwinkel nicht mehr i8o°, und der Stromwandler wird von der Induktivität der Nutzbelastung stärker abhängig als beim Vorhandensein eines Kondensators.Also used on its own, the specified inductor acts on the immutability the phase angle at different useful loads; only then is the phase angle no more i8o °, and the current transformer is dependent on the inductance of the useful load more dependent than in the presence of a capacitor.
Die Drosselspule kann unmittelbar an die Sekundärwicklung des Stromwandlers oder an eine besondere Sekundärwicklung angeschlossen werden, oder, wenn eine besondere Sekundär-The choke coil can be connected directly to the secondary winding of the current transformer or to a special secondary winding must be connected, or, if a special secondary winding
wicklung für einen Kondensator vorhanden ist, auch parallel zum Kondensator an diese Wicklung.winding for a capacitor is available, also parallel to the capacitor to this Winding.
Claims (1)
Publications (1)
Publication Number | Publication Date |
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DE296839C true DE296839C (en) |
Family
ID=551189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DENDAT296839D Active DE296839C (en) |
Country Status (1)
Country | Link |
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DE (1) | DE296839C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4705789A (en) * | 1983-09-17 | 1987-11-10 | Bayer Aktiengesellschaft | Solutions of lactic acid salts of piperazinylquinolone- and piperazinyl-azaquinolone-carboxylic acids |
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0
- DE DENDAT296839D patent/DE296839C/de active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4705789A (en) * | 1983-09-17 | 1987-11-10 | Bayer Aktiengesellschaft | Solutions of lactic acid salts of piperazinylquinolone- and piperazinyl-azaquinolone-carboxylic acids |
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