DE721843C - Transformer in which the 5th and 7th harmonic are compensated by regulating the 3rd harmonic - Google Patents
Transformer in which the 5th and 7th harmonic are compensated by regulating the 3rd harmonicInfo
- Publication number
- DE721843C DE721843C DEA79027D DEA0079027D DE721843C DE 721843 C DE721843 C DE 721843C DE A79027 D DEA79027 D DE A79027D DE A0079027 D DEA0079027 D DE A0079027D DE 721843 C DE721843 C DE 721843C
- Authority
- DE
- Germany
- Prior art keywords
- transformer
- harmonic
- auxiliary
- harmonics
- compensated
- 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)
- Supply And Distribution Of Alternating Current (AREA)
- Ac-Ac Conversion (AREA)
- Regulation Of General Use Transformers (AREA)
Description
Transformator, bei dem die 5. und 7. Oberwelle auf dem Wege der Regelung der 3. Oberwelle kompensiert wird Es äst bekannt, die 5. Harmonische in einem Kerntransformator dadurch zu unterdrücken, daß durch Anbri bgung eines oder mehrerer Rückschlußschenkel die sich bildende 3. Harmonische im Fluß auf einen passenden Wert eingestellt wird. Man hat auch bereits die Rückschlußschenkel, mit Hilfswicklungen versehen und an diese eine induktive oder kapazitive Last angeschlossen, je nachdem ob der Fluß dreifacher Frequenz verkleinert :oder vergrößert werden soll. Bei den bekannten Anordnungen ist es schwierig, mit genügender Genauigkeit den Umkehrpunkt reinzustellen, bei welchem gerade die 5. Harmonische verschwindet. Man hat daher bereits die an die Hilfswicklungen angeschlossene Induktivität selbsttätig derart einstellbar gemacht, daß die Oberwellen möglichst verschwinden. Diesem Zweck dient ein Relais, welches in Abhängigkeit von der Größe der an dem Transformator herrschenden Spannung bzw. in Abhängigkeit von der Größe des Magnetisierungsstromes die Einstellung der Induktivität bewirkt.Transformer in which the 5th and 7th harmonics are on the way of regulation the 3rd harmonic is compensated It is known that the 5th harmonic in a core transformer to be suppressed by attaching one or more back yoke legs the 3rd harmonic that forms in the flow is set to a suitable value. The yoke legs have already been provided with auxiliary windings and on this connected an inductive or capacitive load, depending on whether the flux three times the frequency reduced: or should be increased. With the known Arrangements, it is difficult to set the reversal point with sufficient accuracy, at which the 5th harmonic just disappears. So you already have them on the auxiliary windings connected inductance made automatically adjustable in such a way, that the harmonics disappear as possible. A relay serves this purpose, which depending on the size of the voltage or the setting of the inductance depending on the magnitude of the magnetizing current causes.
Mit diesen Anordnungen wird also lediglich der Oberwellenbetrag des jeweiligen Transformators kompensiert. Eine überkompensation, d. h. eine Kompensation evtl. noch parallel geschalteter Transformatoren oder auch des Netzes selbst, das im allgemeinen eine stark positive Harmonische aufweist, ist nicht möglich.With these arrangements, only the harmonic magnitude of the compensated for the respective transformer. An overcompensation, i.e. H. a compensation possibly transformers connected in parallel or the network itself, the generally has a strongly positive harmonic is not possible.
Erfindungsgemäß wird nun auch dieserreicht, indem der erforderliche Betrag der 3. Oberwelle im Kraftfluß durch die Hilfsspannung eines solchen Gerätes eingestellt wird, durch dessen Regelung der Fluß dreifacher Frequenz auch über den normalen Betrag, der sich bei freiem magnetischem Rückschluß einstellt, hinaus sowohl verkleinert als auch vergrößert werden kann. Jetzt ist nicht nur eine Kompensation des Transformators selbst, sondern auch die gleichzeitige Kompensation des Netzes parallel geschalteter Transformatoren o. dgl. möglich.According to the invention, this is now also achieved by the required Amount of the 3rd harmonic in the power flow through the auxiliary voltage of such a device is set, by the regulation of the flux of three times the frequency over the normal amount that occurs with free magnetic return, in addition to both can be reduced as well as enlarged. Now is not just a compensation of the transformer itself, but also the simultaneous compensation of the network transformers or the like connected in parallel are possible.
Die Hilfsspannung wird man zweckmäßigerweise einem als Frequenzwandler arbeitenden hochgesättigten Transformator entnehmen. Man fügt sie vorteilhaft in leinen Stromkreis ein, in welchem sich die Summenspannung der Grundwelle zu Null ergänzt, beispielsweise bei einem Fünfschenkelkern der auf den Außenschenkeln hegenden Hilfswicklung oder einer auf den Hauptschenkeln liegenden Dreieckwicklung. Der Hilfstransformator ist so geschaltet, daß sich die von ihm benötigten Oberwellen von den Restoberwellen des Haupttransformators subtrahieren. Diese Bedingung kann durch Zickzackschaltung seiner Primärwicklung erfüllt werden.The auxiliary voltage is expediently used as a frequency converter remove working highly saturated transformer. It is beneficial to add them in A circuit in which the total voltage of the fundamental wave is zero supplemented, for example, in the case of a five-limb core, the one lying on the outer thighs Auxiliary winding or a triangular winding lying on the main legs. The auxiliary transformer is switched in such a way that the from him required harmonics of subtract the residual harmonics of the main transformer. This condition can go through Zigzag circuit of its primary winding can be met.
In der Abbildung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es ist a der Kern eines Drehstromtransformators mit einem q.. und 5. Hilfsschenkel b1, b2. Diese tragen die Hilfswicklungen cl, c2, welche in Serie geschaltet und an den Frequenzumformerd angeschlossen sind. Die Hauptwicklungen sind der Deutlichkeit halber fortgelassen.In the figure, an embodiment of the invention is shown. It is a the core of a three-phase transformer with a q .. and 5th auxiliary leg b1, b2. These carry the auxiliary windings cl, c2, which are connected in series and are connected to the frequency converterd. The main windings are of clarity omitted for the sake of
Die vorstehenden für die 5. Oberwelle angestellten Überlegungen gelten sinngemäß auch für die 7. Oberwelle.The above considerations for the 5th harmonic apply analogously also for the 7th harmonic.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA79027D DE721843C (en) | 1936-04-05 | 1936-04-05 | Transformer in which the 5th and 7th harmonic are compensated by regulating the 3rd harmonic |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA79027D DE721843C (en) | 1936-04-05 | 1936-04-05 | Transformer in which the 5th and 7th harmonic are compensated by regulating the 3rd harmonic |
Publications (1)
Publication Number | Publication Date |
---|---|
DE721843C true DE721843C (en) | 1942-06-20 |
Family
ID=6947610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEA79027D Expired DE721843C (en) | 1936-04-05 | 1936-04-05 | Transformer in which the 5th and 7th harmonic are compensated by regulating the 3rd harmonic |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE721843C (en) |
-
1936
- 1936-04-05 DE DEA79027D patent/DE721843C/en not_active Expired
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