DE643125C - Protective circuit for the selective display or shutdown of an earth fault - Google Patents

Protective circuit for the selective display or shutdown of an earth fault

Info

Publication number
DE643125C
DE643125C DEA62650D DEA0062650D DE643125C DE 643125 C DE643125 C DE 643125C DE A62650 D DEA62650 D DE A62650D DE A0062650 D DEA0062650 D DE A0062650D DE 643125 C DE643125 C DE 643125C
Authority
DE
Germany
Prior art keywords
earth fault
shutdown
selective display
protective circuit
turns
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
DEA62650D
Other languages
German (de)
Inventor
Dr Rolf Wideroee
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 DEA62650D priority Critical patent/DE643125C/en
Application granted granted Critical
Publication of DE643125C publication Critical patent/DE643125C/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
    • H02H3/26—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

Schutzschaltung zum selektiven Anzeigen oder Abschalten eines Erdschlusses Zum selektiven Anzeigen oder Abschalten erdschlußbehafteter Stromerzeuger oder Umformer sind bereits Einrichtungen bekannt, die vom Erdschlußstrom beeinflußt werden. Man hat dabei entweder den in der Erdschlußverbindung des Nullpunktes auftretenden Strom zur Anzeige gebracht oder den in der Verbindungsleitung des zu überwachenden Apparates mit dem Netz auftretenden Summen- Moder Asymmetriestrom. Zur Erhöhung der Selektivität wurden auch bereits beide Ströme miteinander verglichen und erst beim Auftreten einer Differenz -des in den Anlageteil hinein- und aus ihm herausfließenden Erdschlußstromes die Vorrichtung zum Ansprechen gebracht. Dabei besteht die Aufgabe, die Einrichtung so empfindlich zu bauen, daß bereits ganz geringe Ströme eine Betätigung zur Folge haben. Zur Erhöhung der Empfindlichkeit zieht man daher meistens auch noch die Erdschlußspannung heran und bildet die Anzeigerelais nach dem Wattmeterprinzip aus.Protective circuit for the selective display or shutdown of an earth fault For selective display or disconnection of power generators or converters subject to earth faults facilities are already known which are influenced by the earth fault current. Man has either the current occurring in the earth fault connection of the zero point displayed or in the connection line of the device to be monitored cumulative moderate asymmetry current occurring with the network. To increase the selectivity both streams have already been compared with each other and only when they occur a difference of the earth fault current flowing into and out of the system part brought the device to respond. The task here is the establishment To be built so sensitively that even very small currents result in actuation to have. In order to increase the sensitivity, the earth fault voltage is usually also drawn approaches and forms the display relay according to the wattmeter principle.

Eine weit empfindlichere Einrichtung, bei der Relais nur mit einer einzigen Spule erforderlich sind, wird nach der Erfindung dadurch erreicht, daß parallel zu den Sekundärwicklungen der zur Gewinnung des Erdschlußstromes vorgesehenen Wandler, die mit einem magnetischen Kern und einer Sekundärwicklung ausgerüstet sind, deren Win.-dungszahl und ein Bruchteil des Widerstandes des angeschlossenen Stromkreises betragende Widerstand so bemessen sind, daß die sekundären Amperewindungen praktisch keine entmagnetisierenden Wirkungen hervorrufen, mit diesen auf Resonanz abgestimmte Kapazitäten angeordnet sind. Durch die Wahl der Windungszahl und des Widerstandes .der sekundären Wandlerwicklungen werden beim Auftreten von nur geringen Erdschlußströmen bereits relativ hohe Spannungen in der Sekundärwicklung wirksam, die in dem angeschlossenen Relaiskreis nachgewiesen werden können. Als Relais muß dann ein solches hoher Empfindlichkeit und geringer Leistung verwendet werden, damit die Spannung in der Sekundärwicklung nicht zusammenbricht. Damit die hohe Empfindlichkeit nicht zu Fehlauslösungen führt, sind erfindungsgemäß die zu den Spannungsspulen parallel geschalteten Kapazitäten vorgesehen.- Durch diese wird nämlich im Spannungskreis nicht nur die Blindleistung kompensiert, sondern der Einfluß .der Grundwelle wird erhöht im Vergleich zum Einfluß der Oberwellen, die sonst zu einem ungewollten Ansprechen führen könnten. Der Widerstand des angeschlossenen Kreises kann mehr als das Tausendfache des Widerstandes der Sekundärwicklungen der Stromwandler betragen. Das Windungszahlverhältnis der primären zu den sekundären Wicklungen wird möglichst klein gewählt, mindestens kleiner als i :Zoo. Da die magnetische Beanspruchung deraxtiger Wandler infolge des Verschwindens der entmägn ti-: sierenden Wirkung der sekundären l@riIpc:= Windungen sehr klein ist, kann der Qüi'.f -` schnitt des Eisenkreises relativ gering gewählt werden, namentlich dann, wenn als Material Eisen von hoher Permeabilität, wie Permalloy-, Mumetal o. dgl., vorgesehen sind.A far more sensitive device where the relay only has one single coil are required, is achieved according to the invention in that parallel to the secondary windings provided for the generation of the earth fault current Converters equipped with a magnetic core and a secondary winding are, their number of turns and a fraction of the resistance of the connected The resistance of the circuit is dimensioned so that the secondary ampere-turns cause practically no demagnetizing effects, with these on resonance coordinated capacities are arranged. By choosing the number of turns and the Resistance .der secondary converter windings are when only small Earth fault currents already have relatively high voltages in the secondary winding, which can be verified in the connected relay circuit. As a relay must then such a high sensitivity and low power can be used so the voltage in the secondary winding does not collapse. So the high sensitivity does not lead to false tripping, according to the invention are those relating to the voltage coils capacitances connected in parallel are provided not only the reactive power is compensated, but the influence of the fundamental wave is increased compared to the influence of the harmonics, which would otherwise lead to an unwanted response could lead. The resistance of the connected circuit can be more than a thousand times of the resistance of the secondary windings of the current transformers. The number of turns ratio the primary to the secondary Windings will be as small as possible chosen, at least smaller than i: Zoo. Since the magnetic stress of the axtiger Converter as a result of the disappearance of the dismantling effect of the secondary l @ riIpc: = turns is very small, the Qüi'.f -` can cut the iron circle can be chosen relatively low, especially when the material iron is high Permeability, such as permalloy, mumetal or the like. Are provided.

Damit bei auftretenden Kurzschlüssen oder Doppelerdschlüssen die an den Spannungsspulen entstehenden Überspannungen keine schädlichen Einwirkungen zur Folge haben, ist es zweckmäßig, parallel zu den Spulen eine der bekannten L berspannungssicherungen vorzusehen, die aus einer Funkenstrecke oder einer Glimmröhre o. dgl. bestehen kann.So that if short circuits or double earth faults occur, the The overvoltages generated by the voltage coils do not have any harmful effects As a result, it is advisable to have one of the known L overvoltage fuses parallel to the coils to be provided, which can consist of a spark gap or a glow tube or the like.

Claims (1)

PATENTAN SPRUCIi Schutzschaltung zum selektiven Anzeigen oder Abschalten eines Erdschlursses mit Hilfe von Erdschlußrelais, die vom Erdschlußstrom beeinflußt sind, dadurch gekennzeichnet, daß parallel zu den Sekundärwicklungen der zur Erregung der Erdschlußrelais vorgesehenen Wandler, die mit einem magnetischen Kern und einer Sekundärwicklung ausgerüstet sind, deren Windungszahl und nur einen Bruchteil des Widerstandes des angeschlossenen Relaisstromkreises betragender Widerstand so bemessen sind, daß die sekundären Amperewindungen keine eritmagnetisierenden Wirkungen hervorrufen, mit diesen auf Resonanz abgestimmte Kapazitäten angeordnet sind.PATENTAN SPRUCIi protection circuit for selective display or shutdown an earth fault with the help of earth fault relays, which is influenced by the earth fault current are, characterized in that parallel to the secondary windings for excitation the earth fault relay provided transducers with a magnetic core and a Secondary winding are equipped, the number of turns and only a fraction of the Resistance of the connected relay circuit is dimensioned in this way are that the secondary ampere-turns do not cause any erit-magnetizing effects, with these tuned to resonance capacities are arranged.
DEA62650D 1931-07-10 1931-07-10 Protective circuit for the selective display or shutdown of an earth fault Expired DE643125C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA62650D DE643125C (en) 1931-07-10 1931-07-10 Protective circuit for the selective display or shutdown of an earth fault

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA62650D DE643125C (en) 1931-07-10 1931-07-10 Protective circuit for the selective display or shutdown of an earth fault

Publications (1)

Publication Number Publication Date
DE643125C true DE643125C (en) 1937-03-25

Family

ID=6942970

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA62650D Expired DE643125C (en) 1931-07-10 1931-07-10 Protective circuit for the selective display or shutdown of an earth fault

Country Status (1)

Country Link
DE (1) DE643125C (en)

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