DE569159C - Device for selectively indicating or switching off an earth fault - Google Patents
Device for selectively indicating or switching off an earth faultInfo
- Publication number
- DE569159C DE569159C DEA61435D DEA0061435D DE569159C DE 569159 C DE569159 C DE 569159C DE A61435 D DEA61435 D DE A61435D DE A0061435 D DEA0061435 D DE A0061435D DE 569159 C DE569159 C DE 569159C
- Authority
- DE
- Germany
- Prior art keywords
- earth
- earth fault
- current
- zero point
- connection
- 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
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
- H02H3/347—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system using summation current transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
DEUTSCHES REICHGERMAN EMPIRE
AUSGEGEBEN AM
30. JANUAR 1933ISSUED ON
JANUARY 30, 1933
-REICHSPATENTAMT- GERMAN PATENT OFFICE
PATENTSCHRIFTPATENT LETTERING
KLASSE 21 c GRUPPE 6850CLASS 21 c GROUP 6850
Patentiert im Deutschen Reiche vom 2. April 1931 abPatented in the German Empire on April 2, 1931
Zum selektiven Erfassen eines Erdschlusses sind Einrichtungen bekanntgeworden, welche die innerhalb des zu überwachenden Apparates zur Erde abfließenden Ströme zur Anzeige bringen. Es wird dazu der in den Anlageteil hineinfließende Summenstrom gemessen. Bei nichtgeerdeten Stromerzeugern oder Umformern, Generatoren oder Transformatoren hat man zur Erhöhung der Empfindlichkeit an das Netz einen belastbaren Nullpunkt angeschlossen und über Widerstände geerdet. Bei geerdeten Apparaten vergleicht man meist den in den Anlageteil hineinfließenden Summenstrom mit dem in der Erdschlußverbindung auftretenden Strom durch eine Differentialschaltung, welche beim Auftreten einer Differenz die Einrichtung zum Ansprechen bringt. Zur Erhöhung der Empfindlichkeit wird auch vielfach noch die Erdschlußspannung herangezogen.For the selective detection of a ground fault devices have become known which display the currents flowing to earth within the apparatus to be monitored. It becomes the one in the Total current flowing into the system part measured. For non-earthed power generators or converters, generators or transformers are used to increase the sensitivity A loadable zero point is connected to the network and grounded via resistors. Compare for earthed devices usually the total current flowing into the system part with the current occurring in the earth fault connection a differential circuit which, when a difference occurs, the device for Appeals. The earth fault voltage is also often used to increase the sensitivity used.
Bei derartigen Einrichtungen wirkt sich nun die Kapazität der Wicklungen gegen Erde schädlich aus insofern, als dadurch ein Kapazitätsstrom entsteht, der in allen Phasen gleichgerichtet ist und somit einen Asymmetriestrom oder einen Erdschlußstrom darstellt. Dieser kapazitive Strom täuscht demnach für die Schutzeinrichtung einen Erdschluß vor und führt somit zu unwillkommenen Auslösungen.In such devices, the capacitance of the windings now counteracts Earth harmful insofar as it creates a capacity current that flows in all Phases is rectified and thus an asymmetry current or a ground fault current represents. This capacitive current therefore deceives the protective device as a ground fault and thus leads to unwelcome trips.
Diese Nachteile werden durch die Erfindung dadurch vermieden, daß der Nullpunkt des zu überwachenden Apparates ohne Rücksicht auf eine weitere Erdschlußverbindung über eine Induktivität mit Erde verbunden wird, die der Kapazität der Wicklungen gegen das Gehäuse ganz oder nahezu entspricht. Diese Induktivität kompensiert demnach die Kapazität der Wicklung gegen das Gehäuse in derselben Weise wie die bekannte Petersen-Spule die Kapazität des Netzes gegen Erde. Die Anordnung ist unabhängig davon, ob eine weitere Erdschlußverbindung besteht oder nicht.These disadvantages are avoided by the invention in that the zero point of the apparatus to be monitored regardless of a further earth fault connection is connected to earth via an inductance that opposes the capacitance of the windings the housing corresponds completely or nearly. This inductance therefore compensates for the Capacity of the winding against the housing in the same way as the well-known Petersen coil the capacity of the network to earth. The arrangement is independent of whether there is another earth fault connection or not.
In Abb. ι ist ein Ausführungsbeispiel der Erfindung dargestellt. An das Netz RST ist ein Generator 1 geschaltet, in dessen Verbindungsleitung drei Stromwandler 2 gelegt sind, deren Sekundärkreise in Holmgren-Schaltung liegen und zu einem amperemetrischen oder wattmetrischen Erdschlußrelais 3 geführt sind. Der Nullpunkt des Generators 1 ist dann nach der Erfindung über eine Induktivität 4 geerdet, die der Kapazität der Wicklungen des Generators 1 gegen das Gehäuse entspricht. Da diese Erdverbindung auf den Nullpunkt nahezu isolierend wirkt, ist zur Beeinflussung des Erdschlußstromes in bekannter Weise an das Netz ein belastbarer Nullpunkt 5 angeschlossen, der über entsprechend bemessene Widerstände 6 geerdet ist. Ist das Erdschlußrelais 3 wattmetrisch ausgebildet, dann kann seine Spannungsspule an die Induktivität 4In Fig. Ι an embodiment of the invention is shown. A generator 1 is connected to the network RST , in the connecting line of which three current transformers 2 are placed, the secondary circuits of which are in Holmgren circuit and are led to an amperometric or wattmetric earth-fault relay 3. The zero point of the generator 1 is then grounded according to the invention via an inductance 4, which corresponds to the capacitance of the windings of the generator 1 with respect to the housing. Since this earth connection has an almost isolating effect on the zero point, a loadable zero point 5 is connected to the network in a known manner in order to influence the earth fault current and is earthed via appropriately dimensioned resistors 6. If the earth fault relay is 3 wattmetric, then its voltage coil can be connected to the inductance 4
*) Von dem Patentsucher ist als der Erfinder angegeben worden:*) The patent seeker stated as the inventor:
Dr. Rolf Wideröe in Berlin-Karlshorst.Dr. Rolf Wideröe in Berlin-Karlshorst.
oder die Widerstandskombination 6 angeschlossen werden.or the resistor combination 6 can be connected.
In Abb. 2 ist ein Ausführungsbeispiel der Erfindung für einen geerdeten Generator ι gezeigt. Die Zuleitungen und die Erdschlußverbindung sind in bekannter Weise über einen gemeinsamen Wandler 7 geführt, an dessen Sekundärwicklung das Erdschlußrelais 3 angeschlossen ist. Nach der Erfindung ist nun der Nullpunkt des Generators 1 außer durch die eigentliche Erdverbindung über eine Drosselspule 4 an Erde angeschlossen. Die Spannung des Erdschlußrelais 3 ist an der Erdschlußspule 4 abgenommen. In Fig. 2 is an embodiment of the Invention for a grounded generator ι shown. The supply lines and the earth fault connection are performed in a known manner via a common converter 7 the secondary winding of which the earth fault relay 3 is connected. According to the invention is now the zero point of generator 1 except through the actual earth connection connected to earth via a choke coil 4. The voltage of the earth leakage relay 3 is removed from the ground fault coil 4.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEA61435D DE569159C (en) | 1931-04-02 | 1931-04-02 | Device for selectively indicating or switching off an earth fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEA61435D DE569159C (en) | 1931-04-02 | 1931-04-02 | Device for selectively indicating or switching off an earth fault |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE569159C true DE569159C (en) | 1933-01-30 |
Family
ID=6942578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEA61435D Expired DE569159C (en) | 1931-04-02 | 1931-04-02 | Device for selectively indicating or switching off an earth fault |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE569159C (en) |
-
1931
- 1931-04-02 DE DEA61435D patent/DE569159C/en not_active Expired
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