DE523014C - Earth fault relay for n-phase AC lines to which the sum of the currents of all phases is fed in an asymmetrical circuit - Google Patents

Earth fault relay for n-phase AC lines to which the sum of the currents of all phases is fed in an asymmetrical circuit

Info

Publication number
DE523014C
DE523014C DEA51604D DEA0051604D DE523014C DE 523014 C DE523014 C DE 523014C DE A51604 D DEA51604 D DE A51604D DE A0051604 D DEA0051604 D DE A0051604D DE 523014 C DE523014 C DE 523014C
Authority
DE
Germany
Prior art keywords
currents
earth fault
phases
fault relay
sum
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
DEA51604D
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
Publication date
Priority to DEA51604D priority Critical patent/DE523014C/en
Application granted granted Critical
Publication of DE523014C publication Critical patent/DE523014C/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

Es ist üblich, den Erdschlußrelais die Summe der Ströme aller Phasen durch in Asymmetrieschaltung angeordnete Stromwandler zuzuführen. Benutzt man zu diesem Zwecke weniger genaue Stromwandler, ζ. Β. Durchführungsstromwandler, so wird infolge unvermeidlicher Unterschiede zwischen den Wandlern die Summe der Ströme nie genau gleich Null sein. Es wird also auch bei gesundem Netz immer ein kleiner Strom durch das Erdschlußrelais fließen.It is common for the earth fault relay to calculate the sum of the currents of all phases through in Supply current transformer arranged asymmetrical circuit. If less accurate current transformers are used for this purpose, ζ. Β. Bushing current transformer, as a result of inevitable differences between the Converters, the sum of the currents will never be exactly zero. So it will also be with healthy ones Mains a small current will always flow through the earth fault relay.

Man kann nun diesen Fehler nicht einfach dadurch kompensieren, daß man, wie dies sonst in der Meßtechnik üblich ist, zu den Sekundärwicklungen aller Wandler oder mindestens zu (w"-1) Wandlern, wobei η die Phasenzahl ist, regelbare Ohmsche oder induktive Widerstände parallel schaltet; denn bei den üblichen Asymmetrieschaltungen, bei denen die Stromwandler aller Phasen an beiden Enden direkt miteinander verbunden sind, würden diese Widerstände auf die Größe des von jedem Stromwandler gelieferten Stromes keinen Einfluß haben.One cannot compensate for this error simply by having controllable ohmic or inductive resistances parallel to the secondary windings of all converters or at least to (w "- 1 ) converters, where η is the number of phases, as is otherwise customary in measurement technology switches; because with the usual asymmetrical circuits in which the current transformers of all phases are directly connected to one another at both ends, these resistances would have no influence on the magnitude of the current supplied by each current transformer.

Erfindungsgemäß wird die erforderliche Kompensation dadurch erreicht, daß man außer diesen Parallelwiderständen noch andere Ohmsche oder induktive Belastungswiderstände in Reihe mit jeder Sekundärwick- lung der Stromwandler legt. Diese Reihenwiderstände kann man entweder eigens zu diesem Zweck einbauen, oder man kann auch dafür die Wicklungen vorhandener Relais, Meßinstrumente ο. dgl. benutzen. -According to the invention, the required Compensation is achieved by adding, in addition to these parallel resistances other ohmic or inductive load resistances in series with each secondary winding the current transformer sets. These series resistors you can either install it specifically for this purpose, or you can also use the windings of existing relays, Measuring instruments ο. use. -

In der Zeichnung ist ein Ausführungsbeispiel dargestellt. In die drei Phasen einer Drehstromleitung sind Stromwandler eingebaut. Die Sekundärwicklungen α von zweien dieser Wandler sind mit einem Parallelwiderstand b versehen. In Reihe mit den Sekundärwicklungen liegen Überstromrelais c. Das Erdschlußrelais ist mit d bezeichnet. Durch Änderung des Wertes der Widerstände b kann man den Strom in dem Erdschlußrelais so abgleichen, daß er über den ganzen in Betracht kommenden Bereich in zulässigen Grenzen von Null abweicht.An exemplary embodiment is shown in the drawing. Current transformers are built into the three phases of a three-phase line. The secondary windings α of two of these converters are provided with a parallel resistor b . Overcurrent relays c are in series with the secondary windings. The earth fault relay is labeled d. By changing the value of the resistors b , the current in the earth fault relay can be adjusted so that it deviates from zero within permissible limits over the entire range in question.

Claims (2)

Patentansprüche:Patent claims: 1. Erdschlußrelais für ß-Phasen-Wechselstromleitungen, dem die Summe der Ströme aller Phasen in Asymmetrieschaltung zugeführt wird, dadurch gekennzeichnet, daß in Serie mit jeder Sekundärwicklung der diese Ströme liefernden Stromwandler ein Ohmscher oder induktiver Widerstand und parallel zu mindestens (n — 1) Sekundärwicklungen regelbare Ohmsche oder induktive Widerstände angeordnet sind.1. Earth fault relay for ß-phase alternating current lines, to which the sum of the currents of all phases is fed in an asymmetrical circuit, characterized in that in series with each secondary winding of the current transformer delivering these currents, an ohmic or inductive resistance and parallel to at least (n - 1 ) Secondary windings adjustable ohmic or inductive resistances are arranged. 2. Erdschlußrelais nach Anspruch I, dadurch gekennzeichnet/ daß als •Serienwiderstände die Wicklungen von Überstromi'elais, Meßinstrumenten ο. dgl. dienen.2. Earth fault relay according to claim I, characterized / that as • series resistors the windings of overcurrent relays, measuring instruments ο. like. serve. *J Von dem Patentsucher ist als der Erfinder angegeben worden: * J The patent seeker stated as the inventor: Otto Mayr in Berlin-Karlshorst.Otto Mayr in Berlin-Karlshorst. Hierzu 1 Blatt Zeichnungen1 sheet of drawings
DEA51604D Earth fault relay for n-phase AC lines to which the sum of the currents of all phases is fed in an asymmetrical circuit Expired DE523014C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA51604D DE523014C (en) Earth fault relay for n-phase AC lines to which the sum of the currents of all phases is fed in an asymmetrical circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA51604D DE523014C (en) Earth fault relay for n-phase AC lines to which the sum of the currents of all phases is fed in an asymmetrical circuit

Publications (1)

Publication Number Publication Date
DE523014C true DE523014C (en) 1931-04-18

Family

ID=6938036

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA51604D Expired DE523014C (en) Earth fault relay for n-phase AC lines to which the sum of the currents of all phases is fed in an asymmetrical circuit

Country Status (1)

Country Link
DE (1) DE523014C (en)

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