DE897730C - Protective circuit for double earth fault detection - Google Patents

Protective circuit for double earth fault detection

Info

Publication number
DE897730C
DE897730C DEA7114D DEA0007114D DE897730C DE 897730 C DE897730 C DE 897730C DE A7114 D DEA7114 D DE A7114D DE A0007114 D DEA0007114 D DE A0007114D DE 897730 C DE897730 C DE 897730C
Authority
DE
Germany
Prior art keywords
earth fault
fault detection
relay
protective circuit
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
DEA7114D
Other languages
German (de)
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.)
AEG AG
Original Assignee
AEG 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 AEG AG filed Critical AEG AG
Priority to DEA7114D priority Critical patent/DE897730C/en
Application granted granted Critical
Publication of DE897730C publication Critical patent/DE897730C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0038—Details of emergency protective circuit arrangements concerning the connection of the detecting means, e.g. for reducing their number
    • H02H1/0046—Commutating the detecting means in dependance of the fault, e.g. for reducing their number

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Description

Es ist bereits bekannt, daß den Distanzrelais zur Doppelerdschlußerfässung statt der verketteten Spannungen und Ströme die Spannungen und Ströme der Schleife Leiter-Erde zugeführt werden. Die Umschaltung der Distanzrelais kann durch ihre Anregeglieder oder durch besondere Hilfsrelais erfolgen. Diese Hilfsrelais, als Erdschlußrelais gekennzeichnet, werden ihrerseits durch die Nullpunktspannung oder durch den Unsymmetriestrom (Summenstrom des Mehrphasensystems) erregt. Die Erregung durch den Unsymmetriestrom wird allgemein bevorzugt und erfolgt in der hek'annten Summennstromwandlerschaltung.It is already known that the distance relay for double earth fault detection instead of the linked voltages and currents, the voltages and currents of the loop Conductor-earth are fed. The switching of the distance relays can be done by their Pick-up elements or by special auxiliary relays. These auxiliary relays, as Earth fault relays are marked in turn by the zero point voltage or excited by the asymmetry current (total current of the multi-phase system). The excitement due to the unbalance current is generally preferred and takes place in the usual manner Summation current transformer circuit.

Diese bekannte Anordnung hat jedoch den Nachteil, daß am Erdschlußrelais während des Di@stanzschutzabläufes ein Spannungsabfall entsteht, .der idie Strom- und Spannungsmeßgrößen, bezogen auf ihre Größe und Phasenlage, so ungünstig becinflußt, .daß eine selektive Kurzschlußerfassung nicht möglich ist.However, this known arrangement has the disadvantage that on the ground fault relay a voltage drop occurs during the gap protection process, which i the current and voltage measurement quantities, related to their size and phase position, so unfavorably influenced, .that selective short-circuit detection is not possible.

Dieser Nachfeil wird erfindungsgemäß dadurch beseitigt, daß bei der vorgenannten Summenstromwandlerschaltung nach dem Ansprechen .des Erdschlußrelais .die starren Punkte der - Stromwandlersch.altung kurzgeschlossen werden. Die Kurzschlußverbindung kann .dabei vom Erdschlußrelais selbst oder einem Hilfsrelais vorgenommen werden.This disadvantage is eliminated according to the invention that in the The aforementioned summation current transformer circuit after the earth fault relay has responded .the rigid points of the - current transformer circuit are short-circuited. The short circuit can be done by the earth fault relay itself or an auxiliary relay.

Nachstehend wird .die Erfindung an Hand der Zeichnung noch näher erläutert.The invention is explained in more detail below with reference to the drawing.

Auf dieser sind in den Leitungen R, S und T eines Mehrphasensystems die Stromwandler 1, 2 und 3 eingeschaltet. Die Wandler sind auf der Sekundärseite 4n Stern geschaltet und über die Stromkreise der Distanzrelais 4, 5 und 6 miteinander verbunden. Hierbei können die Schaltzeichen 4 bis 6 auch Widerstände sein, an denen eine stromproportionale Spannung etwa wie 7 oder ß zur Steuerung der Distanzrelais abgegriffen werden. Das Erdschlußrelais 9 ist nun, wie bekannt, zwischen :den beiden Sternpunkten io und i i eingeschaltet und wird damit im Erdschlußf.alle vom Summenstrom der Stromwandler durchflossen. Dadurch können aber durch Erdschlußrelais die vorstehenden nachteiligen Erscheinungen hervorgerufen werden.This is in the lines R, S and T of a multi-phase system the current transformers 1, 2 and 3 switched on. The converters are on the secondary side 4n star and connected to each other via the circuits of distance relays 4, 5 and 6 tied together. The circuit symbols 4 to 6 can also be resistors at which a current-proportional voltage such as 7 or ß to control the distance relay be tapped. The earth fault relay 9 is now, as is known, between: the two Star points io and i i switched on and is thus all of the total current in the earth fault the current transformer flowed through. However, this can cause the above adverse phenomena are caused.

Deshalb wird: erfindungsgemäß .das Erdschlußrelais 9 nach erfolgtem Ansprechen vom Kontakt 12 kurzgeschlossen und damit der Spannungsabfall während des Distanzschutzablaufes zwischen den beiden Sternpunkten io und 11 beseitigt.Therefore: according to the invention. The earth fault relay 9 after Response from contact 12 short-circuited and thus the voltage drop during of the distance protection process between the two star points io and 11 eliminated.

Claims (2)

PATENTANSPRÜCHE: i. Schutzschaltung für Doppelerdschlußerfassung mit angeschlossenem Erdschlußrielai.s, .das von einer Summenstro.mwandlerschaltung erregt wird, dadurch gekennzeichnet, daß nach ,dem Ansprechen des Erdschlußrelais (9) die Sternpunkte (io, ii)- der Stromwandlerschaltung kurzgeschlossen werden. PATENT CLAIMS: i. Protection circuit for double earth fault detection with connected earth leakage rielai.s, .that is excited by a summation current converter circuit is, characterized in that after the response of the earth fault relay (9) the Star points (io, ii) - the current transformer circuit is short-circuited. 2. Schutzschaltung nach Anspruch i, dadurch gekennzeichnet, daß .das Kurzschließen vom Erdschlußrelais (9) selbst oder von einem Hilfrelais vorgenommen wird.2. Protection circuit according to claim i, characterized in that the short-circuiting of the earth-fault relay (9) is carried out by itself or by an auxiliary relay.
DEA7114D 1942-05-15 1942-05-15 Protective circuit for double earth fault detection Expired DE897730C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA7114D DE897730C (en) 1942-05-15 1942-05-15 Protective circuit for double earth fault detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA7114D DE897730C (en) 1942-05-15 1942-05-15 Protective circuit for double earth fault detection

Publications (1)

Publication Number Publication Date
DE897730C true DE897730C (en) 1953-11-23

Family

ID=6921162

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA7114D Expired DE897730C (en) 1942-05-15 1942-05-15 Protective circuit for double earth fault detection

Country Status (1)

Country Link
DE (1) DE897730C (en)

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