DE876427C - Frame closure protection device - Google Patents

Frame closure protection device

Info

Publication number
DE876427C
DE876427C DES3059D DES0003059D DE876427C DE 876427 C DE876427 C DE 876427C DE S3059 D DES3059 D DE S3059D DE S0003059 D DES0003059 D DE S0003059D DE 876427 C DE876427 C DE 876427C
Authority
DE
Germany
Prior art keywords
capacitors
protection device
star point
relay
earth
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
Application number
DES3059D
Other languages
German (de)
Inventor
Leopold Dipl-Ing Ferschl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DES3059D priority Critical patent/DE876427C/en
Application granted granted Critical
Publication of DE876427C publication Critical patent/DE876427C/en
Expired legal-status Critical Current

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
    • H02H3/16—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 fault current to earth, frame or mass
    • H02H3/162—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 fault current to earth, frame or mass for ac systems
    • H02H3/165—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 fault current to earth, frame or mass for ac systems for three-phase systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Description

Bei einem Generator, der durch einen Transformator vom Netz und von anderen Generatoren getrennt ist (Blöckschaltung), hat man, bereits vorgeschlagen, um auch Fehler im Sternpunkt oder in der Nähe :des Sternpunktes .des Generators zu erfassen, die dritten Oberwellen heranizuzielhen. Zu diesem Zweck hat man einen künstlichen Sternpunkt durch Kondensatoren gebildet und den Sternpunkt über eine Drosselspule und ein Relais mit Erde verbunden. Durch die Anwendung der Drosselspule wird erreicht, daß der Strom der dritten Oberwelle im Verhältnis. zum Grundwellenstrom vergrößert wird und daß infolgedessen der auf das Relais einwirkende Strom bei einem Fehler von -der Lage Säer Fehlerstelle nicht mehr so stark abhängig ist wie ohne Anwendung der Drossel.In the case of a generator that is connected to and from the network by a transformer is separated from other generators (block circuit), it has already been proposed that to include errors in the star point or in the vicinity: the star point of the generator to detect, to target the third harmonics. You have one for that purpose artificial star point formed by capacitors and the star point via a Choke coil and a relay connected to ground. By using the choke coil is achieved that the current of the third harmonic in the ratio. to the fundamental wave current is increased and that, as a result, the current acting on the relay at a Error is no longer dependent on the location of the sowing error location as much as without it Application of the throttle.

Durch die gegenseitige Kapazität der Transformatorwicklungen können nun von der Oberspannungsseite .des Transformators Wanderwellen in den Generator eindringen. Um diese Wanderwellen gegen Erde abzuleiten, kann man in an sich bekannter Weise die, Phasen über Kondensatoren erden.Due to the mutual capacitance of the transformer windings you can now traveling waves from the high-voltage side of the transformer into the generator penetration. In order to derive these traveling waves against earth, one can use in itself known Way the, phases ground through capacitors.

Gemäß der Erfindung kann, man. nun diese Schutzkondensatoren .mit in den Erdschlußsehätz einbeziehen, indem man sie nicht unmittelbar mit Erde verbindet, sondern über das Erdschlußrelais.According to the invention, one can. now these protective capacitors .with include in the earth fault line by not connecting them directly to earth, but via the earth fault relay.

In der Zeichnung ist ein, Ausführungsbeispiel der Erfindung dargestellt. Mit z ist der Generator bezeichnet, der über einen Transformator a auf ein Netz 3. arbeitet. Der künstliche Sternpunkt wird gebildet durch Kondensatoren q.. Er ist über eine Drosselspule 5 und die Primärwicklung eines Wandlers 6 geerdet, dessen Sekurndürwicklung das Relais 7 speist. Die Drosselspule und die Kondenisatoren werden so aufeinander abgestimmt, daß sie für die dreifache Frequenz annähernd in Resonanz sind. Zur Ableitung der Überspannungen dienen Schutzkondensatoren B. Der Sternpunkt dieser Kondensatoren ist nicht unmittelbar an Erde gelegt, sondern so angeschlossen, daß der Strom über diese Kondensutoren durch den Wandler 6 fließt.In the drawing, an embodiment of the invention is shown. The generator z is referred to, which is connected to a network via a transformer a 3. works. The artificial star point is formed by capacitors q .. Er is grounded via a choke coil 5 and the primary winding of a converter 6, whose Secondary winding feeds relay 7. The reactor and the capacitors will be matched so that they almost resonate for three times the frequency are. Protective capacitors B are used to divert the overvoltages. The star point this capacitor is not directly connected to earth, but connected in such a way that that the current flows through the converter 6 via these capacitors.

Die Anordnung nach der Erfindung ist auch anwendbar, wenn- mehrere Generatoren unmittelbar parallel arbeiten. und für jeden ein künstlicher Sternpunkt und Schutzkondensatoren vorgesehen sind. Das Erdschlußrelais wird dann so angeschlossen, daß ihm einerseits: der Summenstrom iiv den Zuleitungen zum Generator, andererseits. die Summe der Ströme über dien künstlichen Sternpunkt und die Schützkonidensätoren :derart zugeführt werden, daß die beiden Summenströme in .gleicher Richtung durch das Relais bei einem Fehler im zugehörigen Generator fließen.The arrangement according to the invention can also be used if several Generators work directly in parallel. and an artificial star point for everyone and protective capacitors are provided. The earth fault relay is then connected in such a way that that on the one hand: the total current iiv the supply lines to the generator, on the other hand. the sum of the currents over the artificial star point and the Schützkonidensätoren : are fed in such a way that the two total currents in the same direction through the relay will flow in the event of a fault in the associated generator.

Claims (1)

PATENTANSPRUCH: Drdschlußschutzeinrichtung unter #Terwendung eines aus Kondensatoren, gebildeten künstlichem Sternpunktes, der über eine Drosselspule und ein Relais geerdet ist; dadurch gekennzeichnet, daß bei Vorhandensein von Schutzkondensatoren zum Ableiten von: Überspannungen der Sternpunkt dieser Kondensatoren ebenfalls über das Erdschlußrelais mit Erde verbunden ist.PATENT CLAIM: Earth leakage protection device using a from capacitors, formed artificial star point, which over a choke coil and a relay is grounded; characterized in that in the presence of protective capacitors to divert: overvoltages the star point of these capacitors also over the earth fault relay is connected to earth.
DES3059D 1944-09-26 1944-09-26 Frame closure protection device Expired DE876427C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES3059D DE876427C (en) 1944-09-26 1944-09-26 Frame closure protection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES3059D DE876427C (en) 1944-09-26 1944-09-26 Frame closure protection device

Publications (1)

Publication Number Publication Date
DE876427C true DE876427C (en) 1953-05-11

Family

ID=7469938

Family Applications (1)

Application Number Title Priority Date Filing Date
DES3059D Expired DE876427C (en) 1944-09-26 1944-09-26 Frame closure protection device

Country Status (1)

Country Link
DE (1) DE876427C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3034904A1 (en) * 1980-09-16 1982-04-29 Marine Safe Electronics of Canada Ltd., Concord, Ontario Electric motor low windings resistance protection system - compares windings resistance when motor is at rest with threshold value

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3034904A1 (en) * 1980-09-16 1982-04-29 Marine Safe Electronics of Canada Ltd., Concord, Ontario Electric motor low windings resistance protection system - compares windings resistance when motor is at rest with threshold value

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