AT121912B - Procedure for overlaying extensive power networks with control currents. - Google Patents
Procedure for overlaying extensive power networks with control currents.Info
- Publication number
- AT121912B AT121912B AT121912DA AT121912B AT 121912 B AT121912 B AT 121912B AT 121912D A AT121912D A AT 121912DA AT 121912 B AT121912 B AT 121912B
- Authority
- AT
- Austria
- Prior art keywords
- districts
- frequency
- station
- overlaying
- procedure
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B37/00—Tables adapted for other particular purposes
- A47B2037/005—Tables specially adapted for laboratories
Landscapes
- Devices For Supply Of Signal Current (AREA)
Description
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Verfahren zur Überlagerung von ausgedehnten Starkstromnetzen mit Steuerströmen.
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Sind zwei Netzbezirke vielfach miteinander vermischt, so dass die Absperrung zu grosse Kosten verursachen würde, so kann man unter Umständen auf die Absperrung ganz oder teilweise verzichten, jedem Bezirk eine besondere Überlagerungsstation zuteilen, die Überlagerungsstationen gleichzeitig betreiben, aber in der Weise, dass wenigstens die Steuerfrequenz der einen Station in kleinen Intervallen um die benötigte Frequenz pendelt. Es tritt dann in der Sendezeit, beispielsweise je einmal in der Minute, ein Betriebszustand ein, wo die Spannungsvektoren der beiden Stationen miteinander in Phase sind. Bei diesem Zustand summieren sich an allen Stellen der beiden Bezirke, insbesondere auch an den Bezirks-
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nicht notwendig. Die Absperrung der einzelnen Netzbezirke kann bei Gleichstromnetzen z.
B. durch Drosselspulen erfolgen, bei Wechselstromnetzen durch Transformatoren mit Haupt-und Gegenwieklung. wobei die Hauptwicklung in den Netzleiter eingeschaltet ist, während die Gegenwicklung von einer Hilfsspannungsquelle mit Netzfrequenz oder im Nebenschluss zu einem im Netzleiter eingeschalteten Widerstand, insbesondere im Nebenschluss zur Hauptwieklung, gespeist wird und einen frequenzabhängigen Widerstand solcher Art enthält, dass das Gleichgewicht der Amperewindungen der Haupt-und Gegenwicklung nur bei Netzfrequenz, nicht aber bei Steuerfrequenz vorhanden ist. Ein solcher Transformator wirkt für den Netzstrom in der Hauptsache nur wie ein Ohmseher Widerstand, für den Steuerstrom da-
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frequenz abgestimmten Schwingungskreis ausbilden.
Bei Absperrung der Bezirke durch Gegenspannungs- quellen mit Steuerfrequenz wird an der Bezirksgrenze ungefähr dieselbe Spannung abgesetzt, die in der Überlagerungsstation aufgedrückt wird. Man kann aber auch die Absperrung mit Sperrkreisen, die auf die Steuerfrequenz abgestimmt sind, durchführen.
PATENT-ANSPRÜCHE :
1. Verfahren zur Überlagerung von ausgedehnten Starkstromnetzen. deren Leiter zum Teil frequenzabhängige, den Durchgang bestimmter Frequenzen sperrende Widerstände enthalten, mit Steuerströmen netzfremder Frequenz, dadurch gekennzeichnet, dass durch diese Widerstände das Starkstromnetz für die Steuerströme in wenigstens zwei Bezirke unterteilt wird. die je von einem Speisepunkt getrennt mit tonfrequenten Steuerströmen überlagert werden.
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Procedure for overlaying extensive power networks with control currents.
EMI1.1
If two network districts are mixed with one another so that the barring would cause excessive costs, it may be possible to completely or partially dispense with barring, assign a special overlay station to each district, operate the overlay stations at the same time, but in such a way that at least the Control frequency of one station fluctuates around the required frequency in small intervals. During the transmission time, for example once a minute, an operating state occurs where the voltage vectors of the two stations are in phase with one another. In this situation, add up at all points in the two districts, in particular also at the district
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unnecessary. The isolation of the individual network districts can be done in direct current networks z.
B. by choke coils, in AC networks by transformers with main and counterweight. where the main winding is switched on in the mains conductor, while the counter-winding is fed by an auxiliary voltage source with mains frequency or in a shunt to a resistor connected in the mains conductor, in particular in a shunt to the main circuit, and contains a frequency-dependent resistor such that the balance of the ampere turns of the main -and reverse winding is only present at mains frequency, but not at control frequency. Such a transformer acts mainly like an ohmic resistor for the mains current;
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Form a frequency-matched oscillation circuit.
When the districts are blocked by counter-voltage sources with a control frequency, approximately the same voltage is applied to the district boundary as is applied in the overlay station. But you can also shut off with blocking circuits that are matched to the control frequency.
PATENT CLAIMS:
1. Procedure for overlaying extensive power networks. the conductors of which contain partly frequency-dependent resistors blocking the passage of certain frequencies, with control currents of non-network frequency, characterized in that the high-voltage network for the control currents is divided into at least two areas by these resistors. which are each superimposed separately from a feed point with audio-frequency control currents.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE121912T | 1929-01-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT121912B true AT121912B (en) | 1931-03-25 |
Family
ID=29277186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT121912D AT121912B (en) | 1929-01-07 | 1930-01-04 | Procedure for overlaying extensive power networks with control currents. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT121912B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE739264C (en) * | 1936-02-26 | 1943-09-17 | Siemens Ag | Method for the remote control of receiving relays connected to a power network with the aid of intermediate relays |
-
1930
- 1930-01-04 AT AT121912D patent/AT121912B/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE739264C (en) * | 1936-02-26 | 1943-09-17 | Siemens Ag | Method for the remote control of receiving relays connected to a power network with the aid of intermediate relays |
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