[go: up one dir, main page]

DK161284B - FAULT CURRENT PROTECTION SWITCH, RESPONSE TO FAULT CURRENT WITH CURRENT CURRENT COMPONENTS - Google Patents

FAULT CURRENT PROTECTION SWITCH, RESPONSE TO FAULT CURRENT WITH CURRENT CURRENT COMPONENTS Download PDF

Info

Publication number
DK161284B
DK161284B DK026783A DK26783A DK161284B DK 161284 B DK161284 B DK 161284B DK 026783 A DK026783 A DK 026783A DK 26783 A DK26783 A DK 26783A DK 161284 B DK161284 B DK 161284B
Authority
DK
Denmark
Prior art keywords
induction
current
fault
winding
abstat
Prior art date
Application number
DK026783A
Other languages
Danish (da)
Other versions
DK26783A (en
DK161284C (en
DK26783D0 (en
Inventor
Helmut Roesch
Reinhard Solleder
Karl-Heinz Stich
Original Assignee
Siemens 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 Siemens Ag filed Critical Siemens Ag
Publication of DK26783D0 publication Critical patent/DK26783D0/en
Publication of DK26783A publication Critical patent/DK26783A/en
Publication of DK161284B publication Critical patent/DK161284B/en
Application granted granted Critical
Publication of DK161284C publication Critical patent/DK161284C/en

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
    • H02H3/33—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
    • H02H3/332—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 with means responsive to DC component in the fault current

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Control Of Eletrric Generators (AREA)
  • Breakers (AREA)
  • Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
  • Protection Of Transformers (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

1. An earth leakage circuit breaker which responds to fault currents with direct current components, - whose magnetic core (13) of the summation current transformer (2) has an induction stroke which is sufficiently great for a pulsing d.c. fault current flowing in its primary winding (3) to induce in the secondary winding (4) a voltage necessary for actuating the magnetic release device (6) by means of its release winding (5), - which has a capacitor (9) connected between the secondary winding (4) and the release winding (5), - wherein the oscillation circuit thus formed can be set to the frequency of the voltage which is induced in the secondary winding (4) by a pulsing d.c. fault current flowing in the primary winding (3) of the summation current transformer (2), - and wherein the magnetic core (13) has a dynamic differential induction, delta Bdym, between the maximum induction Bmax, and the dynamic residual induction, Brdyn, of see diagramm : EP0084814,P4,F1 and in that - the ratio of the static differential induction, delta Bstat, between the maximum induction Bmax, and the static residual induction, Brstat, to the dynamic differential induction, delta Bdyn, satisfies the equation : see diagramm : EP0084814,P4,F2 characterised in that in an earth leakage circuit breaker - for a nominal fault current of 300 or 500 mA leading to release, the amplitude of the magnetic field strength with alternating current is approximately ^H apprch= 0,03 A/cm and the associated magnetic induction lies approximately at ^B >= 0,5 T, and that - for a nominal fault current leading to release that is smaller than or equal to 10 mA, the ratio of the static differential induction with direct current superimposition, delta Bstat with-direct, to the static differential induction without direct current superimposition, delta Bstat-without-direct, does not fall below a value of 0.85 according to the equation see diagramm : EP0084814,P4,F3

Description

-1 --1 -

DK 161284 BDK 161284 B

Opfindelsen angår en fejlstrømsbeskyttelseafbryder Ifølge indledningen til patentkravet, i overensstemmelse med den teknik, som fremgår af dansk fremlæggelsesskrift 156 352.The invention relates to a fault current protection switch according to the preamble of the claim, in accordance with the technique disclosed in Danish Patent Specification 156 352.

Der kendes en fejlstrømbeskyttelsesafbryder, som reagerer på fej 1-5 strømme ved jævnstrømskomponenter, hvis magnetkerne i sumstrømtransfor-matoren har et induktionsudslag, som for en i dens primærvikling løbende pulserende jævnstrømsfejlstrøm er tilstrækkelig stor til i sekundærviklingen at inducere en spænding, som er tilstrækkelig til påvirkning af udløsemagneten ved hjælp af dens udløsevikling (DE-fremlæggelses-10 skrift 20 44 302).An error current protection switch is known which responds to faults 1-5 currents by direct current components if the magnetic core of the sum current transformer has an inductance which, for a pulsed direct current fault current, is sufficiently large to induce a sufficient voltage in the secondary winding. actuation of the trigger magnet by its trigger winding (DE presentation 10, writing 20 44 302).

Der kendes endvidere en fejlstrømsbeskyttelsesafbryder, som mellem sekundærvikling og udløsevikling har den kondensator, hvorhos den derved dannede svingkreds er afstemt efter frekvensen af den spænding, som i sekundærviklingen induceres af en i primærviklingen af sumstrømtrans-15 formatoren løbende pulserende jævnstrømsfejlstrøm (DE-patentskrift 20 36 497).Furthermore, there is known a fault current protection switch which has between the secondary winding and the trigger winding the capacitor in which the resulting circuit is tuned according to the frequency of the voltage induced in the secondary winding by a pulsating DC current 20 in the primary winding of the current transformer 497).

Der er allerede foreslået en kombination af de nævnte foranstaltninger med en magnetkerne, som har en dynamisk differensinduktion, ABdyn, mellem den maksimale induktion, Bmax, og den dynamiske remanens-20 induktion, Brdyn, påA combination of the aforementioned measures has already been proposed with a magnetic core having a dynamic difference induction, ABdyn, between the maximum induction, Bmax, and the dynamic residual 20 induction, Brdyn, of

ABdyn £ 0,1 TABdyn £ 0.1 T

og hvor forholdet for den statiske differensinduktions, ABstat, mellem 25 den maksimale induktion, Bmax, og den statiske remanensinduktion,and wherein the ratio of the static differential induction, ABstat, between the maximum induction, Bmax, and the static residual induction,

Brstat, til den dynamiske differensinduktion, ABdyn, opfylder relatio__ nen ABstat 30 - i 1,3 ABdyn ifølge dansk fremlæggelsesskrift 156 352.Brstat, for the dynamic difference induction, ABdyn, satisfies the relationship ABstat 30 - in 1.3 ABdyn according to Danish submission 156 1562.

En sådan fejlstrømsbeskyttelsesafbryder reagerer på vekselstrømsfejlstrømme samt på pulserende fejlstrømme, altså på jævnstrømskom-^5 ponenter.Such a fault current protection circuit breaker responds to AC fault currents as well as to pulsating fault currents, that is, to DC components.

Til grund for opfindelsen ligger den opgave at videreudforme enThe object of the invention lies in the task of further designing one

DK 161284 BDK 161284 B

- 2 - fejlstrømsbeskyttelseafbryder af den indledningsvis nævnte art således, at den også ved serieproduktion reagerer sikkert på de forskellige fejlstrømsformer, især på sådanne, som er defineret i VDE-Vorschrift 0664 fra 1981.- 2 - fault current protection circuit breaker of the type mentioned in the introduction so that it also reacts safely to the various fault current forms in series production, in particular to those defined in 1981 VDE-Vorschrift 0664.

5 Løsningen på den stillede opgave ligger i en fejlstrømsbeskyttel sesafbryder med ejendommeligheder ifølge den kendetegnende del af patentkravet. Ifølge denne er amplituden af den magnetiske feltstyrke ved vekselstrøm omtrent H s 0,03 amp. pr. cm. endvidere ved en fejlstrømsbeskyttelsesafbryder til en til udløsning førende nominal fejl strøm på 10 300 mA eller 500 mA i overensstemmelse med VDE 0664 T.1/5.81. Den tilhørende magnetiske induktion ligger ifølge dette omtrent ved § £ 0,5 T.5 The solution to the posed task lies in a fault current protection switch with peculiarities according to the characteristic part of the patent claim. According to this, the amplitude of the magnetic field strength at alternating current is about H s 0.03 amp. per. cm. in addition, a fault current protection switch for a nominal fault current of 10 300 mA or 500 mA in accordance with VDE 0664 T.1 / 5.81. Accordingly, the associated magnetic induction is approximately at £ 0.5 T.

15 Ifølge opfindelsen underskrider forholdet af den statiske diffe rensinduktion, ABstat-med-jævn, til den statiske differensstrøminduk-tion uden jævnstrømsoverlejring, ABstat-uden-jævn, ikke en værdi -på 0,85 ved en udløsenominal fejl strøm mindre end eller lig med 10 mA, ifølge VDE 0664 T. 1/5. 81. Der gælder altså relationen: 20 ABstat-med-jævn > q 85i ABstat-uden-jævnAccording to the invention, the ratio of the static diffusive induction, ABstat-with-even, to the static differential current induction without direct current overlay, ABstat-without-equal, does not underestimate a value of 0.85 at a trigger nominal current less than or equal to 10 mA, according to VDE 0664 T. 1/5. 81. The relation thus applies: 20 ABstat-with-even> q 85i ABstat-without-even

En sådan fejlstrømsbeskyttelsesafbryder med nominal fejl strøm 10 mA 25 udløser ved en halvbølgestrøm som fejlstrøm ifølge VDE forskrift 0664 del 1/5.81 (1,4 x nominal fejl strømmen + 6 mA = 20 mA) i overensstemmelse hermed også, når en glat jævnstrømsfejlstrøm på 6 mA (= en feltstyrke på 7,5mA pr.cm) samtidig er overlejret halvbølgestrømmen. Ved fejlstrømsbeskyttelsesafbrydere med nominal fejl strøm 10 mA andrager den 30 overlej rede jævnstrøm på 6 mA herved allerede 60% af nominal fejl strømmen. Fejlstrømsbeskyttelsesafbryderen ifølge opfindelsen reagerer også sikkert ved denne overlejrede jævnstrømsfejlstrøm, ifølge de foran beskrevne udløseværdier i overensstemmelse med forskriften.Such a fault current protection switch with nominal fault current 10 mA 25 triggers at a half-wave current as fault current according to VDE regulation 0664 part 1 / 5.81 (1.4 x nominal fault current + 6 mA = 20 mA) accordingly also when a smooth direct current fault current of 6 mA (= a field strength of 7.5mA per cm) is superimposed on the half-wave current. In the case of fault current protection switches with nominal fault current 10 mA, the 30 superimposed DC of 6 mA thus already accounts for 60% of the nominal fault current. The fault current protection switch of the invention also responds safely to this superimposed direct current fault current, according to the triggering values described above in accordance with the regulation.

Opfindelsen forklares i det følgende ved hjælp af et på tegningen 35 groft skematisk gengivet udførelseseksempel. På tegningen viser: - 3 -The invention is explained in the following by means of an exemplary embodiment illustrated in the drawing 35. The drawing shows: - 3 -

DK 161284 BDK 161284 B

Fig. 1 den principielle konstruktion af fejlstrømsbeskyttelsesafbryderen fig. 2 et diagram, på hvis abscisse feltstyrken og på hvis ordinat den magnetiske induktion af materialet i sum-5 strømtransformatorens kerne er indtegnet.FIG. 1 shows the principle construction of the fault current protection switch FIG. 2 is a diagram on which the abscissa field strength and on whose ordinate the magnetic induction of the material into the sum of the sum transformer core is plotted.

Fejlstrømsbeskyttelsesafbryderen 1 ifølge fig. 1 består i det væsentlige af sumstrømtransformatoren 2 med de gennemførte ledere, som skal overvåges, som udgør primærviklingen 3, og sekundær viklingen 4, 10 som er forbundet med udløseviklingen 5 i udløseren 6. Udløseren 6 kan være en holdemagnet. Forbrugeren, som skal overvåges, og forsyningsnettet kan valgfrit tilsluttes klemmerne 7 eller 8.The fault current protection switch 1 of FIG. 1 is essentially comprised of the sum current transformer 2 with the conductors to be monitored constituting the primary winding 3 and the secondary winding 4, 10 connected to the trigger winding 5 of the trigger 6. The trigger 6 may be a holding magnet. The consumer to be monitored and the supply network can optionally be connected to terminals 7 or 8.

Mellem sekundærviklingen 4 og udløseviklingen 5 er der indkoblet en kondensator 9, som kan ligge parallelt eller i serie. Den derved 15 dannede svingningskreds er afstemt efter frekvensen af den spænding, som induceres i sekundærviklingen 4 af en i primærviklingerne 3 i sumstrømtransformatoren løbende pulserende jævnstrømsfejlstrøm. Udløseren 6, fx. en holdemagnet, virker via en mekanisk forbindelsesdel 10 på afbryderlåsen 11. Når afbryderlåsen 11 udløses, åbnes kontakterne 12 og 20 forbrugeren, som skal overvåges kobles fra nettet.Between the secondary winding 4 and the release winding 5, a capacitor 9 is connected which can be parallel or in series. The oscillation circuit thus formed is tuned to the frequency of the voltage induced in the secondary winding 4 by a pulse dc current flowing in the primary winding 3 of the sum current transformer. The trigger 6, e.g. a holding magnet, operates via a mechanical connector 10 on the switch latch 11. When the switch latch 11 is released, contacts 12 and 20 open the consumer, which must be monitored disconnected from the network.

Det er herunder væsentligt, at materialet i magentkernen 13 i sumstrømtransformatoren 2 overholder relationerne: ABdyn £ 0,1 T, 25 ABstat^i)3.It is important, then, that the material in the magnetic core 13 of the sum-current transformer 2 adheres to the relationships: ABdyn £ 0.1 T, 25 ABstat ^ i) 3.

ABdyn På fig. 2 vises de i den forannævnte relation indeholdte størrelser i princippet, men på grund af anskueligheden dog ikke selve rela-30 tionen. Den magnetiske induktion er betegnet med T i enheden Tesia i formlen. Afstemningen af resonanskredsen kan ske på den måde, som det er gengivet i DE-patentskrift 20 36 497. Med den førnævnte særlige udformning af magnetkernen kan man også forøge følsomheden overfor jævnstrømskomponenter uden en resonansafstemning, dog ikke i den overra-35 skende grad, som det er tilfældet med kombinationen af de angivne foranstaltninger. I diagrammet ifølge fig. 2 er den dynamiske hysterese- - 4 -ABdyn In fig. 2, the sizes contained in the aforementioned relation are shown in principle, but due to the nature, not the relation itself. The magnetic induction is denoted by T in the unit Tesia in the formula. The resonant circuit can be tuned in the manner set forth in DE patent specification 20 36 497. With the aforementioned special design of the magnetic core, it is also possible to increase the sensitivity to direct current components without a resonant tuning, but not to the surprising degree which this is the case with the combination of the measures indicated. In the diagram of FIG. 2 is the dynamic hysteresis - 4 -

DK 161284 BDK 161284 B

sløjfe betegnet med 20 og den statiske hysteresesløjfe med 21.loop denoted by 20 and the static hysteresis loop with 21.

Ifølge opfindelsen er der ved en til udløsning førende nominalfejl strøm på 300 eller på 500 mA yderligere regnet med, at amplituden af den magnetiske feltstyrke ved vekselstrøm andrager omtrent 0,03 A 5 per cm. Den tilhørende magnetiske induktion ligger ifølge dette ved en værdi, som er større end eller lig med 0,5 Tesia. Der gælder altså relationen: H = 0,03 Amp. pr. cm, og at 10 B > 0,5 T.According to the invention, at a nominal fault current of 300 or 500 mA, the amplitude of the alternating current magnetic field strength is assumed to be approximately 0.03 A 5 per cm. Accordingly, the associated magnetic induction is at a value greater than or equal to 0.5 Thesia. The relation thus applies: H = 0.03 Amp. per. cm, and that 10 B> 0.5 T.

Ved en til udløsning førende nominalfejlstrøm, som er mindre end 1 eller lig med 10 mA, opnår man særligt gode udløseforhold, fx. ved halvbølgestrømme som fejlstrøm og samtidig overlejret glat jævnstrøms-15 fejlstrøm på 6 mA, hvis forholdet for den statiske differensinduktion med jævnstrømsoverlejring til den statiske differensstrøminduktion uden jævnstrømsoverlejring ikke underskrider en værdi på 0,85. Der gælder altså relationen 20 ABstat-med-jævn > g Q5# ABstat-uden-jævnAt a nominal failure current leading to less than 1 or equal to 10 mA, particularly good triggering conditions are obtained, e.g. at half-wave currents as fault current, and at the same time superimposed smooth DC fault current of 6 mA if the ratio of the static differential induction with direct current overload to the static differential current without direct current does not fall below a value of 0.85. The relation 20 ABstat-with-even> g Q5 # ABstat-without-even applies

Resultatet af opfindelsen gør det muligt blandt det i handlen værende kernemateriale at udvælge det mest gunstige.The result of the invention enables the most favorable core material to be selected from the commercially available core material.

2525

Claims (2)

1. Fejlstrømsbeskyttelsesafbryder, som reagerer på fejlstrømme med jævnstrømskomponenter, og hvis magnetkerne (13) i sumstrømtransformatoren (2) har et 1nduk-5 tionsudslag, som for en i dens primærvikling (3) løbende pulseren de jævnstrømsfejlstrøm er tilstrækkelig stor til i sekundærviklingen (4) at inducere en spænding, som er tilstrækkelig til påvirkning af udløsemagneten (6) ved hjælp af dens udløsevikling (5) som mellem sekundærvikling (4) og udløsevikling (5) har konden-10 satoren (9) hvorhos den derved dannede svingkreds er afstemt efter frekvensen af den spænding, som i sekundærviklingen (4) induceres af en i primærviklingen (3) af sumstrømtransformatoren (2) løbende, pulserende jævnstrømsfejlstrøm, 15. med en magnetkerne (13), som har en dynamisk differensinduktion, ABdyn, mellem den maksimale induktion, Bmax, og den dynamiske remanensinduktion, Brdyn, på ABdyn >. 0,1 T, 20 og at forholdet for den statiske differensinduktions, ABstat, mellem den maksimale induktion, Bmax, og den statiske remanensinduktion,1. A fault current protection switch which responds to fault currents with direct current components, and if the magnetic core (13) of the sum current transformer (2) has a 1 inductance which for a pulse running in its primary winding (3) is sufficiently large for the second current (4) ) to induce a voltage sufficient to actuate the trigger magnet (6) by its release winding (5) which between secondary winding (4) and release winding (5) has the capacitor (9) to which the pivot circuit thus formed is tuned according to the frequency of the voltage induced in the secondary winding (4) by a pulsed dc current current (2) running in the primary winding (3), with a magnetic core (13) having a dynamic differential induction, ABdyn, between the maximum induction, Bmax, and the dynamic residue induction, Brdyn, on ABdyn>. 0.1 T, 20 and the ratio of the static differential induction, ABstat, between the maximum induction, Bmax, and the static residual induction, 25 Brstat, til den dynamiske differensinduktion, ABdyn, opfylder relationen ABstat ^ 3 ABdyn 30 kendetegnet ved, at amplituden af den magnetiske feltstyrke ved vekselstrøm endvidere omtrent er 35 i) s 0,03 Amp. pr. cm. - 6 - DK 161284 B og den tilhørende magnetiske induktion ifølge dette omtrent ligger ved BkO,5T. 5 ved en fejlstrømsbeskyttelsesafbryder til en til udløsning førende nominal fejl strøm på 300 mA eller 500 mA i overensstemmelse med VDE 0664 T.1/5.81, og at 10. forholdet for den statiske differensinduktion, ABstat-med-jævn, til den statiske differensstrøminduktion uden jævnstrømsoverlejring, ABstat-uden-jævn, ikke underskrider en værdi på 0,85 ved en udløsenominal fejl strøm mindre end eller lig med 10 mA, ifølge relationen: 15 ABstat-med-jævn ^ o 85 ABstat-uden-jævn 2025 Brstat, for the dynamic difference induction, ABdyn, satisfies the relation ABstat ^ 3 ABdyn 30, characterized in that the amplitude of the magnetic field strength at alternating current is also approximately 35 i) s 0.03 Amp. per. cm. - 6 - DK 161284 B and the corresponding magnetic induction according to this is approximately at BkO, 5T. 5 by a fault current protection switch to a 300 mA or 500 mA nominal fault current in accordance with VDE 0664 T.1 / 5.81 and 10. the ratio of the static differential induction, ABstat-with-even, to the static differential current induction without DC overlay, ABstat-without-equal, does not fall below a value of 0.85 at a trigger nominal current less than or equal to 10 mA, according to the relation: 15 ABstat-with-equal ^ o 85 ABstat-without-equal 20
DK026783A 1982-01-26 1983-01-25 FAULT CURRENT PROTECTION SWITCH, RESPONSE TO FAULT CURRENT WITH CURRENT CURRENT COMPONENTS DK161284C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3202320 1982-01-26
DE19823202320 DE3202320A1 (en) 1982-01-26 1982-01-26 Fault current protection switch that responds to fault currents with direct current components

Publications (4)

Publication Number Publication Date
DK26783D0 DK26783D0 (en) 1983-01-25
DK26783A DK26783A (en) 1983-07-27
DK161284B true DK161284B (en) 1991-06-17
DK161284C DK161284C (en) 1991-12-09

Family

ID=6153886

Family Applications (1)

Application Number Title Priority Date Filing Date
DK026783A DK161284C (en) 1982-01-26 1983-01-25 FAULT CURRENT PROTECTION SWITCH, RESPONSE TO FAULT CURRENT WITH CURRENT CURRENT COMPONENTS

Country Status (7)

Country Link
EP (1) EP0084814B1 (en)
JP (1) JPS58130722A (en)
AT (1) ATE12861T1 (en)
DE (1) DE3202320A1 (en)
DK (1) DK161284C (en)
ES (1) ES8402981A2 (en)
ZA (1) ZA83477B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0575639B1 (en) * 1992-06-16 1996-09-04 Siemens Aktiengesellschaft Ground fault circuit interrupter
DE4429007A1 (en) * 1994-08-16 1996-02-22 Siemens Ag Residual current circuit breaker with energy storage circuit
EP1154539A1 (en) * 2000-05-10 2001-11-14 Siemens Aktiengesellschaft Fault current breaker with summation transformer
CN103078291B (en) * 2012-12-27 2015-07-01 江苏创能电器有限公司 Intelligent residual current leakage sudden-change protection method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH532855A (en) * 1970-07-23 1973-01-15 Siemens Ag Residual current circuit breaker
DE2044302B2 (en) * 1970-09-08 1975-01-23 Siemens Ag, 1000 Berlin Und 8000 Muenchen Residual current circuit breaker
DE2062694B2 (en) * 1970-09-08 1975-05-28 Siemens Ag, 1000 Berlin Und 8000 Muenchen Residual current circuit breaker
DE3028595A1 (en) * 1980-07-28 1982-02-25 Siemens AG, 1000 Berlin und 8000 München Fault current protection switch that responds to fault currents with direct current components

Also Published As

Publication number Publication date
ATE12861T1 (en) 1985-05-15
ZA83477B (en) 1983-10-26
ES519278A0 (en) 1984-02-16
DE3202320C2 (en) 1990-07-05
DK26783A (en) 1983-07-27
JPH0353844B2 (en) 1991-08-16
DE3202320A1 (en) 1983-07-28
EP0084814A1 (en) 1983-08-03
DK161284C (en) 1991-12-09
DK26783D0 (en) 1983-01-25
JPS58130722A (en) 1983-08-04
EP0084814B1 (en) 1985-04-17
ES8402981A2 (en) 1984-05-01

Similar Documents

Publication Publication Date Title
Blume et al. Transformer magnetizing inrush currents and influence on system operation
US4685022A (en) Ground fault circuit interrupter capable of deriving energy from ground fault current in order to achieve circuit interruption in the presence of a reduced supply voltage
US4052751A (en) Ground fault interrupter circuit
CA1048136A (en) Ground fault receptacle
US3636482A (en) Modular circuit breakers and panelboards with ground-fault protection
US3376477A (en) Protective circuit
US3566189A (en) Circuit breaker with loosely coupled deenergizing means for high overload currents
GB830018A (en) Protective device for electrical circuits and apparatus
US4000444A (en) Electric circuit breaker with ground fault protection
US4811153A (en) Circuit protector
US2863100A (en) Protective relaying equipment
DK161284B (en) FAULT CURRENT PROTECTION SWITCH, RESPONSE TO FAULT CURRENT WITH CURRENT CURRENT COMPONENTS
US3579038A (en) Electrical fault protection system
ATE2986T1 (en) RESIDUAL CURRENT CIRCUIT BREAKER THAT ALSO RESPONDS TO DC FAULT CURRENT.
ES463586A1 (en) Means for detecting a loss of vacuum in vacuum-type circuit interrupters used in polyphase a.c. vacuum circuit breaker
US3275889A (en) Protection network
US3345539A (en) Static overcurrent tripping system having phase-to-phase and phase-to-ground fault protection
US3723818A (en) Direct acting overcurrent system for high voltage circuit breakers
US2929963A (en) Protective relaying system for direct current equipment
EP1014413B1 (en) Electronic driving circuit for a bistable actuator
US2290101A (en) Protective arrangement
US3414772A (en) Differential relay with restraining means responsive to transformer bank voltage
US3617809A (en) Electronic safety system
US3493839A (en) Reverse current monitor
US3144590A (en) Frequency selective networks