DE576370C - Arrangement for superimposing heavy current networks with audio-frequency currents - Google Patents
Arrangement for superimposing heavy current networks with audio-frequency currentsInfo
- Publication number
- DE576370C DE576370C DEM97790D DEM0097790D DE576370C DE 576370 C DE576370 C DE 576370C DE M97790 D DEM97790 D DE M97790D DE M0097790 D DEM0097790 D DE M0097790D DE 576370 C DE576370 C DE 576370C
- Authority
- DE
- Germany
- Prior art keywords
- arrangement
- audio
- superimposing
- arrangement according
- frequency
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Description
Die Überlagerung von Strömen höherer Periodenzahl auf Gleich- oder Drehstromnetzen ist bekanntlich entweder durch Paralleloder Serienschaltung der Netzstrom- und der Überlagerungsstromquelle möglich.The superposition of currents with a higher number of periods on direct or three-phase networks is known to either be connected in parallel or in series with the mains current and the Overlay current source possible.
Für die Parallelschaltung ist (nach Abb. 1) die Vorschaltung eines Kondensators C vorgeschlagen worden, welcher den Zweck hat, die Überlagerungsstromquelle Q gegen den Netzstrom kapazitiv abzuriegeln. Mittels dieser bekannten Anordnung ist es indessen nicht möglich, durch, richtige Wahl der Kondensatorgröße Spannungsresonanz zu erzielen, da die parallel liegenden Verbraucher wechselnde Wirk- und Scheinwiderstände hervorrufen, so daß die Abgleichung der Induktanzen des Netzes Λ' durch, die (feste) Kapazität des Vorschaltkondensators nicht möglich, ist.For the parallel connection, the upstream connection of a capacitor C has been proposed (according to Fig. 1), which has the purpose of capacitively isolating the superimposed current source Q from the mains current. By means of this known arrangement, however, it is not possible to achieve voltage resonance through the correct choice of the capacitor size, since the loads lying in parallel cause alternating active and apparent resistances, so that the adjustment of the inductances of the network Λ 'through the (fixed) capacitance of the Ballast capacitor is not possible.
Erfindungsgemäß wird dies erreicht, indem hinter den Kondensator C eine Induktanz (D in Abb. 2) geschaltet wird, welche groß ist im Vergleich, mit den Indulctanzen des Netzes W; dadurch, daß die variablen Netzinduktanzen klein sind gegenüber der Vorschaltinduktanz, kann praktisch unabhängig vom Belastungszustand des Netzes N erreicht werden, daß die induktive und die kapazitive Reaktanz gleich sind; somit herrscht in dem durch. C und Z> gebildeten Schwingungskreise Spannungsresonanz. Werden Ströme verschiedener Periodenzahlen überlagert, so wird der aus Kapazität C und Induktivität D bestehende Schwingungskreis der Frequenz nach geregelt; besonders günstig ist dies durch Variation der Induktivität (Phasenschieber) bei fester Kapazität, und zwar entsprechend der Frequenz, was am einfachsten zwangsläufig mit der Regelung der Drehzahl des Überlagerungsgenerators vorgenommen wird.According to the invention, this is achieved in that an inductance (D in Fig. 2) is connected behind the capacitor C, which is large in comparison with the inductances of the network W; Because the variable network inductances are small compared to the series inductance, it can be achieved practically independently of the load condition of the network N that the inductive and capacitive reactance are the same; thus prevails in that. C and Z> formed oscillation circuits voltage resonance. If currents of different numbers of periods are superimposed, the oscillating circuit consisting of capacitance C and inductance D is regulated according to the frequency; This is particularly favorable by varying the inductance (phase shifter) with a fixed capacitance, specifically in accordance with the frequency, which is most simply carried out inevitably by regulating the speed of the superimposition generator.
Die beschriebene Anordnung hat vor denThe arrangement described has before the
bekannten Anordnungen den weiteren Vorteil, daß sie zur automatischen Kompensation der bei Wechsel der Belastung auftretenden Überlagerungsspannungsschwankungen des Netzes verwendet werden kann.known arrangements have the further advantage that they are used to automatically compensate for the Overlay voltage fluctuations that occur when the load changes of the network can be used.
Beispielsweise erzielt man dies vorteilhaft dadurch, daß man den kapazitiven Widerstand des Kondensators C etwas kleiner wählt als den induktiven Widerstand des Leerlauf-Stromkreises (Abb. 2 links vom punktierten Striche). Da bei Anschaltung von Netzbelastungen/V die Gesamtinduktivität verringert wird, so nähert sich bei wachsender Belastung die Abstimmung immer mehr dem reinen Resonanzfalle, wodurch eine Überlagerungspannungserhöhung an den Sammelschienen und somit eine Kompensation des durch die Belastung gleichzeitig hervorgerufenen Spannungsabfalles eintritt.For example, this is advantageously achieved by choosing the capacitive resistance of the capacitor C to be somewhat smaller than the inductive resistance of the no-load circuit (Fig. 2 to the left of the dotted line). Since the total inductance is reduced when mains loads / V are connected, as the load increases, the tuning approaches the pure resonance trap, which results in an increase in superimposed voltage on the busbars and thus a compensation for the voltage drop caused by the load at the same time.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM97790D DE576370C (en) | Arrangement for superimposing heavy current networks with audio-frequency currents |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM97790D DE576370C (en) | Arrangement for superimposing heavy current networks with audio-frequency currents |
Publications (1)
Publication Number | Publication Date |
---|---|
DE576370C true DE576370C (en) | 1933-05-10 |
Family
ID=7323617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEM97790D Expired DE576370C (en) | Arrangement for superimposing heavy current networks with audio-frequency currents |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE576370C (en) |
-
0
- DE DEM97790D patent/DE576370C/en not_active Expired
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