DE604877C - Protective device for high-voltage networks provided with earth leakage coils and summation current transformers - Google Patents

Protective device for high-voltage networks provided with earth leakage coils and summation current transformers

Info

Publication number
DE604877C
DE604877C DEA69536D DEA0069536D DE604877C DE 604877 C DE604877 C DE 604877C DE A69536 D DEA69536 D DE A69536D DE A0069536 D DEA0069536 D DE A0069536D DE 604877 C DE604877 C DE 604877C
Authority
DE
Germany
Prior art keywords
current transformers
summation current
resistance
earth fault
voltage networks
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
DEA69536D
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.)
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
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 BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
Priority to DEA69536D priority Critical patent/DE604877C/en
Application granted granted Critical
Publication of DE604877C publication Critical patent/DE604877C/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

Schutzeinrichtung für mit Erdschlußspulen und Summenstromwandler versehene Hochspannungsnetze Zusatz zum Patent 419 072 In mit Erdschlußspulen versehenen Hochspannungsnetzen werden. vielfach Summenstromwandler in die Leitung. eingebaut, welche dazu dienen, die Stromspule eines Erdscbluß, relais mit dem Summenstrom der Leitung zu speisen. Die hierbei verwendeten Wandler stören oft die Symmetrie der Einrichtung, falls ihre Charakteristiken nicht ,genau miteinander übereinstimmen. Die dadurch hervorgerufenen Eigenfehlerströme bewirken, daß auch bei gesundem Netz Bein Summenstrom besteht, der ein. fehlerhaftes Anzeigen, des Erdschlußrelais zur Folge bat.Protection device for high-voltage networks equipped with earth-fault coils and summation current transformers Addendum to patent 419 072 In high-voltage networks equipped with earth-fault coils. often summation current transformers in the line. built-in, which serve to feed the current coil of a Erdscbluß, relay with the total current of the line. The transducers used here often disturb the symmetry of the device if their characteristics do not exactly match one another. The inherent fault currents caused by this have the effect that even with a healthy network there is a total current, the one. incorrect display, the earth fault relay caused.

Um diesen Nachteil zu vermeiden, soll erfindungsgemäß bei mit Erdschlußspulen versehenen Hochspannungsnetzen, bei denen nach dem Hauptpatent im Normalbetrieb des Netzes die Erdschlußspulen mit Hilfswiderständen kombiniert werden und bei denen bei Eintritt eines Erdschlusses die Hilfswiderstände durch selbständige Einrichtungen unwirksam. gemacht werden, welche unter Einfluß der sich bei Erds:chluß ändernden Strom- bzw. Spannungsgrößen stehen, der im Normalbetrieb des Netzes mit der Erdschlußspule kombinierte Ohmsche Widerstand einen solchen. Werterhalten, daß er im Erdschlußfalle in der Zeit bis zum Eingriff der den Widerstand unwirksam machendem Einrichtungen den Wattreststrom auf einer solchen Größe hält, daß die Eigenfehlerströme von in der Leitung liegenden Summenstromwandlern der . Wirkkomponente des Summenstromes gegenüber zu vernachlässigen sind.In order to avoid this disadvantage, according to the invention, with earth fault coils provided high-voltage networks, in which according to the main patent in normal operation of the network the earth fault coils are combined with auxiliary resistors and where in the event of an earth fault, the auxiliary resistors are provided by independent devices ineffective. are made, which under the influence of the changes at the earth: Current or voltage quantities are available in normal operation of the network with the earth fault coil combined ohmic resistance one such. Preserved value that it should be in the event of an earth fault in the period up to the intervention of the institutions which render the resistance ineffective keeps the residual current at such a level that the residual currents of in summation current transformers of the. Active component of the total current are negligible.

Um den Erdschlußschutz nicht zu gefährden, ist es vorteilhaft, den Schalter, welcher den Ohmschen Widerstand im Erdschlußfalle unwirksam macht, als Schnellschalter auszubilden, so daß ein Erdschlußlichtbogen sich nicht ausbilden kann. In diesem Falle werden Erdschlüsse nur dann vom Erdschlußrelais registriert werden, wenn die von ihnen bedingten Stromstöße in der sehr kurzen Zeit vor Öffnung (bzw. Schließung) des Schalters bereits eine ,gewisse Stärke erlangen. Um aber auch neben den kurzzeitigen Erdschlüssen (den sogenannten Wischern) auch Dauererdschlüsse geringerer Intensität sicher zu erfassen, kann der Schalter mit einer Einrichtung versehen sein, die ihn mach Ablauf einer bestimmten Zeit wieder für kurze Zeit schließt, darauf Faber ihn offen hält, solange der Erdschluß besteht. ' Die kurze Schließungszeit des Schalters braucht nur so lang zu sein, als es das Ansprechen des Erdschlußrelais .erfordert.In order not to endanger the earth fault protection, it is advantageous to use the Switch, which makes the ohmic resistance ineffective in the event of a ground fault, as To train high-speed switch, so that a ground fault arc does not form can. In this case, earth faults are only registered by the earth fault relay when the electric surges they cause in the very short time before opening (or closing) of the switch already gain a certain strength. But also to In addition to the short-term earth faults (the so-called wipers) also permanent earth faults The switch with a device can reliably detect lower intensity be provided that closes it again for a short time after a certain time has elapsed, then Faber keeps it open as long as the earth fault persists. 'The short closing time of The switch only needs to be as long as the response of the earth fault relay .requires.

Durch diese Einrichtung wird erreicht, daß eine Spannungsverlagerung des Netzes im Normalbetrieb verhindert ist, daß im Erdschlußfalle ein Erdschlußlichtbogen nicht zustande kommt und daß das Erdschlußrelais auf kurzzeitige und dauernde Erdschlüsse anspricht.This device ensures that a voltage shift of the network in normal operation is prevented from a ground fault arc in the event of a ground fault does not come about and that the earth fault relay for short-term and permanent earth faults appeals to.

Claims (2)

PATENTANSPRÜCHE i. Schutzekrichtung für mit Erdschlußspulen und Summenstromwandlern versehene Hochspannungsnetze nach Patent 419 072, dadurch gekennzeichnet, daß der ün Normalbetrieb des Netzes mit der Erdschlußspule kombinierte Ohmsche Widerstand einen solchen Wert erhält, daß er im Erdschlußfalle in der Zeit bis zum Eingriff der den Widerstand unwirksam machenden Einrichtungen. den Wattreststrom auf einer solchen Größe hält, daß. die Eigenfehlerströme von in der Leitung liegenden Summenstromwandlern der Wirkkomponente des Summenstromes gegenüber zu vernachlässigen: sind. PATENT CLAIMS i. Protective direction for with earth fault coils and summation current transformers provided high-voltage networks according to patent 419 072, characterized in that the ün normal operation of the network with the earth fault coil combined ohmic resistance is given such a value that, in the event of a ground fault, it takes the time up to the intervention of the institutions that render the resistance ineffective. the residual current on a such size holds that. the residual currents of the summation current transformers in the line the active component of the total current is negligible: are. 2. Schutzeinrichtung nach Anspruch i, dadurch gekennzeichnet, daß die den Widerstand -unwirksam machende Einrichtung ein Schnellschalter ist, der mit einem Zeitwerk versehen seien kann, das ihn nach dem .ersten Ansprechen nach Ablauf .einer gewissen Zeit wieder kurzzeitig schließt (bzw. öffnet), ihn darauf aber erneut ansprechen läßt, so daß der Widerstand dann unwirksam bleibt, solange der Erdschluß besteht.2. Protective device according to claim i, characterized in that the one which makes the resistance ineffective Device is a quick switch that can be provided with a timer, after the first response, after a certain period of time closes (or opens), but lets him respond again, so that the resistance then remains ineffective as long as the earth fault exists.
DEA69536D 1933-05-21 1933-05-21 Protective device for high-voltage networks provided with earth leakage coils and summation current transformers Expired DE604877C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA69536D DE604877C (en) 1933-05-21 1933-05-21 Protective device for high-voltage networks provided with earth leakage coils and summation current transformers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA69536D DE604877C (en) 1933-05-21 1933-05-21 Protective device for high-voltage networks provided with earth leakage coils and summation current transformers

Publications (1)

Publication Number Publication Date
DE604877C true DE604877C (en) 1934-10-31

Family

ID=6945004

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA69536D Expired DE604877C (en) 1933-05-21 1933-05-21 Protective device for high-voltage networks provided with earth leakage coils and summation current transformers

Country Status (1)

Country Link
DE (1) DE604877C (en)

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