DE2700683A1 - Current transformer with delayed action - has additional voltage increasing coil, rectifier, RC element and Zener diodes - Google Patents

Current transformer with delayed action - has additional voltage increasing coil, rectifier, RC element and Zener diodes

Info

Publication number
DE2700683A1
DE2700683A1 DE19772700683 DE2700683A DE2700683A1 DE 2700683 A1 DE2700683 A1 DE 2700683A1 DE 19772700683 DE19772700683 DE 19772700683 DE 2700683 A DE2700683 A DE 2700683A DE 2700683 A1 DE2700683 A1 DE 2700683A1
Authority
DE
Germany
Prior art keywords
current
zener diodes
rectifier
current transformer
transformer
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.)
Withdrawn
Application number
DE19772700683
Other languages
German (de)
Inventor
Heinz Dr Ing Kraeft
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.)
Ritz Messwandler GmbH and Co KG
Original Assignee
Ritz Messwandler GmbH and Co KG
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 Ritz Messwandler GmbH and Co KG filed Critical Ritz Messwandler GmbH and Co KG
Priority to DE19772700683 priority Critical patent/DE2700683A1/en
Publication of DE2700683A1 publication Critical patent/DE2700683A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • 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
    • H02H3/33—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 using summation current transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

In order to attain selectivity between a main switch and series connected switches a current transformer with an additional coil is used. This increases the voltage in a transformer of normal core side. The transformer contains also an RC element and Zener diodes. The current supplied by the secondary winding attains its final value only after a corresponding delay period. In case of faulty current the RC element is supplied with a time-proportional reduced current via the rectifier. The Zener diodes safeguard the time delay also for heavier current values.

Description

Verzögert wirkende Stromwandler Delayed current transformers

Um Selektivität zwischen einem liauptschalter und nachgeschalteten Schaltern zu erreichen ( z.B. für den FI-Schutz ), wird das jeweils verwendete Stromrelais mit einer Verzögerungseinrichtung versehen.To ensure selectivity between a main switch and a downstream switch To reach switches (e.g. for FI protection), the current relay used in each case provided with a delay device.

Solche Relais sind relativ teuer und erfordern teurere Stromwandler mit größerem Kern.Such relays are relatively expensive and require more expensive current transformers with a larger core.

Nach der Anmeldung können - z.B. im Falle des FI-Schutzes - normale Relais und Stromwandler mit ncrmaler Kerngröße verwendet werden: Die Stromwandler erhalten eine Zusatzwicklung, einen Gleichrichter, ein RC-Glied und Zener-Dioden. Mittels der genannten Zusatzwicklung wird die für den Gleichrichter erforderliche größere Spannung gewonnen. Beim Auftreten eines Fehlerstromes fließt ein zeitlich abnehmender Strom über den Gleichrichter in das RC-Glied, so daß die F1-Auslösung erst nach der vorgesehenen Zeit t (z.B. nach 0, 1 s eintritt. Bei Stromwerten oberhalb des Ansprech-Fehlerstromes sprechen die Zener-Dioden an, so daß die vorgesehene Zeit t auch bei größerem Strom eingehalten wird.After logging in - e.g. in the case of FI protection - normal Relays and current transformers with a small core size are used: The current transformers receive an additional winding, a rectifier, an RC element and Zener diodes. By means of the mentioned additional winding, the one required for the rectifier is achieved gained greater tension. When a fault current occurs, a flows in time decreasing current through the rectifier into the RC element, so that the F1 trip occurs only after the specified time t (e.g. after 0.1 s. With current values above of the response fault current speak to the Zener diodes, so that the intended Time t is adhered to even with a larger current.

Kondensator und Elektronik-Teile können außerhalb des Stromwandlers untergebracht werden. Auch kann eine Lasche zum Unwirksamwerden der Verzögerung vorgesehen werden.Capacitor and electronic parts can be outside the current transformer be accommodated. A tab can also be used to disable the delay are provided.

Claims (1)

Patentansprucht Anspruch 1 Stromwandler d. g., daß eine Zusatzwicklung zur Spannungserhöhung, ferner ein Gleichrichter, ein RC-Glied und Zener-Dioden vorgesehen sind, wodurch der von der eigentlichen Sekundärwicklung abgegebene Strom seinen Endwert erst nach dieser entsprechenden Verzögerungszeit erreicht. Claim 1 current transformer d. g. that an additional winding to increase the voltage, a rectifier, an RC element and Zener diodes are also provided are, whereby the current delivered by the actual secondary winding its Final value only reached after this corresponding delay time.
DE19772700683 1977-01-08 1977-01-08 Current transformer with delayed action - has additional voltage increasing coil, rectifier, RC element and Zener diodes Withdrawn DE2700683A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19772700683 DE2700683A1 (en) 1977-01-08 1977-01-08 Current transformer with delayed action - has additional voltage increasing coil, rectifier, RC element and Zener diodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772700683 DE2700683A1 (en) 1977-01-08 1977-01-08 Current transformer with delayed action - has additional voltage increasing coil, rectifier, RC element and Zener diodes

Publications (1)

Publication Number Publication Date
DE2700683A1 true DE2700683A1 (en) 1978-07-20

Family

ID=5998358

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19772700683 Withdrawn DE2700683A1 (en) 1977-01-08 1977-01-08 Current transformer with delayed action - has additional voltage increasing coil, rectifier, RC element and Zener diodes

Country Status (1)

Country Link
DE (1) DE2700683A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2622368A1 (en) * 1987-10-23 1989-04-28 Serd Soc Et Realisa Disjonct SELECTIVE DIFFERENTIAL SWITCH WITH DEFAULT CURRENT

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2622368A1 (en) * 1987-10-23 1989-04-28 Serd Soc Et Realisa Disjonct SELECTIVE DIFFERENTIAL SWITCH WITH DEFAULT CURRENT

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Legal Events

Date Code Title Description
8139 Disposal/non-payment of the annual fee