DE586575C - Resonance circuit for the simultaneous suppression of harmonics and compensation of magnetization currents - Google Patents
Resonance circuit for the simultaneous suppression of harmonics and compensation of magnetization currentsInfo
- Publication number
- DE586575C DE586575C DEE39235D DEE0039235D DE586575C DE 586575 C DE586575 C DE 586575C DE E39235 D DEE39235 D DE E39235D DE E0039235 D DEE0039235 D DE E0039235D DE 586575 C DE586575 C DE 586575C
- Authority
- DE
- Germany
- Prior art keywords
- relay
- current
- resonance circuit
- frequency
- harmonics
- 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
- H01F27/42—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
- H01F38/32—Circuit arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Description
Resonanzkreis zur gleichzeitigen Unterdrückung von Oberwellen und Kompensierung von Magnetisierungsströmen Im Patent 535 000 ist ein Resonanzkreis beschrieben, der auf der Sekundärseite von Transformatoren in Starkstromanlagen, z. B. von. Strom- und Spannungswandlern, liegt und die beiden Aufgaben erfüllt: .einerseits die Empfindlichkeit der Relais von Schutzeinrichtungen beim Auftreten eines Stromes einer bestimmten Frequenz, z. B. der Grundwelle, zu ,erhöhen und andererseits für Ströme anderer Frequenz einen Nebenschluß mit geringem Widerstand zu bilden. Der gleiche Resonanzkreis kann auch dazu dienen, den Sekundärkreis des Transformators bei einer bestimmten Frequenz so zu belasten, wie dies mit Rücksicht auf Phasenschwenkung, Dämpfung usw. erforderlich ist, und gleichzeitig den Stromeiner störenden Frequenz von dem Meßinstrument oder Relais fernzuhalten. An Stelle der im Patent 535 ooo angegebenen Reihenschaltung von Induktivität; Ohmschem Widerstand und Kapazität kann man nach der Erfindung auch' einen Stromresonanzkreis, der aus einer Parallelschaltung von Induktivität, Ohmschem Widerstand und Kapazität besteht, vor das Relais oder Meßinstrument schalten und auf diese Weise die gleichen Wirkungen erzielen. Eine oder mehrere Relaisspulen können dabei die Induktivität bzw. den Ohmschen Widerstand ganz oder teilweise ersetzen. Wenn man also einen Stromresonanzkreis, bestehend aus Induktivität und dazu parallel geschalteter Kapazität, in Reihe mit .einem Relais schaltet, kann man ihn erfindungsgemäß derart abgleichen, daß er bei der störenden Frequenz in Resonanz arbeitet, also in diesem Falle wie ein sehr hoher Widerstand wirkt, so daß durch das Relais kein Strom fließt, der es fälschlicherweise zum Ansprechen bringen kann, während bei einer anderen Frequenz, z. B. der Betriebsfrequent, der Stromresonanzkreis mit der Relaisspule in Spannungsresonanz gerät, so daß in diesem Falle der größtmögliche Strom durch das Relais fließt. Dadurch wird die Ansprechempfindlichkeit des Relais oder des Instruments wesentlich gesteigert, eine Störung durch eine überlagerte, von der Betriebsfrequenz verschiedene Frequenz aber vermieden. Selbstverständlich kann man auch hier so abstimmen, daß beispielsweise bei der Betriebsfrequenz nicht Spannungsresonanz herrscht, sondern eine bestimmte vorgeschriebene Phasenverschiebung zwischen Strom und Spannung erreicht wird.Resonance circuit for the simultaneous suppression of harmonics and compensation of magnetizing currents. Patent 535 000 describes a resonance circuit that is used on the secondary side of transformers in power systems, e.g. B. from. Current and voltage transformers, and fulfills the two tasks: on the one hand, the sensitivity of the relays of protective devices when a current of a certain frequency occurs, e.g. B. the fundamental wave, to increase and on the other hand to form a shunt with low resistance for currents of other frequencies. The same resonant circuit can also be used to load the secondary circuit of the transformer at a certain frequency as required with regard to phase shifting, attenuation, etc., and at the same time to keep the current of an interfering frequency away from the measuring instrument or relay. Instead of the series connection of inductance indicated in patent 535,000; Ohmic resistance and capacitance can, according to the invention, also be connected to a current resonance circuit, which consists of a parallel connection of inductance, ohmic resistance and capacitance, in front of the relay or measuring instrument and in this way achieve the same effects. One or more relay coils can completely or partially replace the inductance or the ohmic resistance. So if you connect a current resonance circuit, consisting of inductance and capacitance connected in parallel, in series with a relay, you can adjust it according to the invention in such a way that it works in resonance at the interfering frequency, i.e. in this case acts like a very high resistance so that no current flows through the relay, which can make it falsely respond, while at a different frequency, z. B. the operating frequency, the current resonance circuit with the relay coil in voltage resonance, so that in this case the greatest possible current flows through the relay. This significantly increases the response sensitivity of the relay or the instrument, but prevents interference from a superimposed frequency that differs from the operating frequency. Of course, you can also vote here so that, for example, there is no voltage resonance at the operating frequency, but a certain prescribed phase shift between current and voltage is achieved.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEE39235D DE586575C (en) | 1929-05-11 | 1929-05-11 | Resonance circuit for the simultaneous suppression of harmonics and compensation of magnetization currents |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEE39235D DE586575C (en) | 1929-05-11 | 1929-05-11 | Resonance circuit for the simultaneous suppression of harmonics and compensation of magnetization currents |
Publications (1)
Publication Number | Publication Date |
---|---|
DE586575C true DE586575C (en) | 1933-10-25 |
Family
ID=7078562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEE39235D Expired DE586575C (en) | 1929-05-11 | 1929-05-11 | Resonance circuit for the simultaneous suppression of harmonics and compensation of magnetization currents |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE586575C (en) |
-
1929
- 1929-05-11 DE DEE39235D patent/DE586575C/en not_active Expired
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