DE601098C - Method for monitoring the coordination of earth fault extinguishing devices - Google Patents
Method for monitoring the coordination of earth fault extinguishing devicesInfo
- Publication number
- DE601098C DE601098C DE1930601098D DE601098DD DE601098C DE 601098 C DE601098 C DE 601098C DE 1930601098 D DE1930601098 D DE 1930601098D DE 601098D D DE601098D D DE 601098DD DE 601098 C DE601098 C DE 601098C
- Authority
- DE
- Germany
- Prior art keywords
- monitoring
- coordination
- earth fault
- auxiliary voltage
- extinguishing devices
- 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
Verfahren zur Überwachung der Abstimmung von Erdschlußlöschvorrichtungen Methoden zur Überwachung der Abstimmung von Erdschlußlöscheinrichtüngen mit Hilfe von Betriebsfrequenz bereiten Schwierigkeiten, weil sie durch die im Netz vorhandene Unsymmetrie beeinflußt werden. Durch letztere wird dem Sternpunkt eine Spannung aufgedrückt, deren Phasenlage unbekannt ist, und welche sich mit der Hilfsspannung, die durch eine künstliche Hilfsspannungsquelle oder durch Erdung einer Phase über einen Widerstand erzeugt wird, zu einer resultierenden Spannung von unbekannter Größe und Phasenlage zusammensetzt. Dieselben Schwierigkeiten treten auf, wenn man den Kompensationsgrad mit Hilfe eines cos cp-Zeigers und Frequenzmessers mißt, da dann im Falle der Resonanz die natürliche Spannungsverlagerung der Netze das Meßergebnis fälscht.Procedure for monitoring the coordination of earth fault extinguishing devices Methods for monitoring the coordination of earth fault extinguishing devices with the help of operating frequency cause difficulties because they are due to the existing in the network Asymmetry can be influenced. The latter creates a voltage at the star point pressed, whose phase position is unknown, and which is related to the auxiliary voltage, by an artificial auxiliary voltage source or by earthing a phase over a resistance is created, to a resulting voltage of unknown Size and phase position composed. The same difficulties arise when one measures the degree of compensation with the help of a cos cp pointer and frequency meter, since then in the case of resonance the natural tension shift of the networks the measurement result fakes.
Es ist vorgeschlagen worden, um sich davon frei zu machen, mit höherer als Netzfrequenz zu arbeiten. Gemäß der Erfindung wird mit zwei von der Netzfrequenz abweichenden Frequenzen die Überwachung der Abstimmung durchgeführt. Dies kann beispielsweise in der Weise geschehen, daß man bei konstanter Spannung' und bekannten Freqenzen den Strom, insbesondere die Blindstromkomponente des Hilfsgenerators oder der Erdschlußspule, mißt, woraus sich die Kapazität und die zur Kompensierung des Erdschlusses erforderliche Induktivität ergibt. Man kann auch die Skalen der Strommesser unmittelbar in Induktivität oder Windungszahl der Löscheinrichtung eichen, wenn man eine Abstimmung bei den beiden von der Netzfrequenz abweichenden Frequenzen vornimmt, von denen eine zweckmäßig unterhalb und die andere oberhalb der Betriebsfrequenz liegt, und hieraus die richtige Abstimmung für die Betriebsfrequenz, beispielsweise aus einem grapbischen Bild, ermitteln. Dies läßt sich auch, wie es für Doppelzeigerinstrumente und Differenzspannungsmesser bekannt ist, durch zwei Meßsysteme vornehmen, welche einen Faden über einer Kurventafel einstellen.It has been suggested to get rid of it with higher to work as a network frequency. According to the invention, with two of the network frequency monitoring of the vote is carried out at deviating frequencies. This can be, for example done in such a way that at constant voltage 'and known frequencies the current, in particular the reactive current component of the auxiliary generator or the earth fault coil, measures what is the capacitance and that required to compensate for the earth fault Inductance results. You can also see the ammeter scales directly in inductance or the number of turns of the extinguishing device, if you have a vote at the carries out two frequencies that differ from the mains frequency, one of which is expedient below and the other above the operating frequency, and from this the correct one Voting for the operating frequency, for example from a graphic image, determine. This can also be done, as is the case for double-pointer instruments and differential voltmeters is known to make by two measuring systems, which a thread over a curve table to adjust.
Die Einführung der Meßspannung mit netzfremder Frequenz kann sowohl derart erfolgen, daß die Hilfsspannungsquelle in Reihe mit der Löscheinrichtung liegt oder daß sie zu ihr oder einem Teil derselben parallel liegt. Man kann auch einen künstlichen Sternpunkt im Netz bilden und über diesen den drei Phasenleitern die Meßspannung zuführen.The introduction of the measuring voltage with a frequency external to the network can be used both take place in such a way that the auxiliary voltage source is in series with the quenching device or that it is parallel to it or a part of it. One can also Form an artificial star point in the network and above this the three phase conductors Apply the measuring voltage.
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE601098T | 1930-06-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE601098C true DE601098C (en) | 1934-08-08 |
Family
ID=6574657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1930601098D Expired DE601098C (en) | 1930-06-01 | 1930-06-01 | Method for monitoring the coordination of earth fault extinguishing devices |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE601098C (en) |
-
1930
- 1930-06-01 DE DE1930601098D patent/DE601098C/en not_active Expired
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