DK147503B - PROTECTION SWITCH CIRCUIT - Google Patents
PROTECTION SWITCH CIRCUIT Download PDFInfo
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- DK147503B DK147503B DK80476A DK80476A DK147503B DK 147503 B DK147503 B DK 147503B DK 80476 A DK80476 A DK 80476A DK 80476 A DK80476 A DK 80476A DK 147503 B DK147503 B DK 147503B
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- DK
- Denmark
- Prior art keywords
- current
- residual
- circuit
- monitoring
- relay
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/001—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of incorrect or interrupted earth connection
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- 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
- H02H3/338—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 also responsive to wiring error, e.g. loss of neutral, break
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Breakers (AREA)
Description
147503147503
Opfindelsen angår et beskyttelsesafbryderkredsløb med en indretning til samtidig overvågning af jordingsmodstanden og af fejlstrømmen i en belastningskreds .The invention relates to a protection switch circuit with a device for simultaneous monitoring of the earthing resistance and of the fault current in a load circuit.
Der kendes en beskyttelsesafbryder, som er udstyret til overvågning af jordingsmodstanden og af fejlstrømmen. Endvidere kendes den elektroniske fejlstrømsovervågning. Overvågningen af isolationsmodstanden til jord med jævnstrøm og under anvendelse af en strømindikator til indikering er kendt som sådan, og ligeledes anvendelsen af sumstrømtransformatorer i fejlstrømsbeskyttelsesafbrydere samt anvendelsen af reed-relæer.A protection switch is known, which is equipped to monitor the ground resistance and the residual current. Furthermore, the electronic residual current monitoring is known. The monitoring of the insulation resistance of earth with direct current and using a current indicator for indication is known as such, as is the use of sum current transformers in residual current circuit breakers as well as the use of reed relays.
Pra CH-patentskrift 36.65.88 kendes en kombination til overvågning af jordingsmodstanden og af fejlstrømmen. Den deri genneførte overvågning af jordingsmodstanden er imidlertid meget ufuldkommen. En afbrydelse af ledningen til - 2 - 147503 jord eller en utilladelig forøgelse af jordingsmodstanden konstateres ikke rettidigt, men meldes først, når isolationsfejlen optræder hos brugeren. Da kan det imidlertid allerede være for sent.Pra CH patent specification 36.65.88 discloses a combination for monitoring the earthing resistance and the fault current. However, the monitoring of grounding resistance implemented therein is very imperfect. A disconnection of the wire to - 2 - 147503 earth or an impermissible increase of the earthing resistance is not detected in time, but is only reported when the insulation fault occurs with the user. Then, however, it may already be too late.
Der kendes endvidere fejlstrømsbeskyttelsesafbrydere, hvis følsomhed over for kapacitive fejlstrømme er mindre end for galvaniske. Den til sumstrømtransformatoren i denne fejlstrømsbeskyttelsesafbryder tilsluttede oprationsforstærker drives med en pulserende jævnspænding.In addition, residual current circuit breakers are known whose sensitivity to capacitive residual currents is less than to galvanic. The operational amplifier connected to the sum current transformer in this residual current circuit breaker is operated with a pulsating direct voltage.
Der kendes endvidere en række kredsløb og indretninger til overvågning enten af jordtilslutninger eller af forekomsten af fejlstrøm. Da disse indretninger kun overvåger enten jordtilslutninger eller fejlstrøm, skal der til en komplet og sikker overvågning af anlæg anvendes to adskilte indretninger, hvilket både med henblik på installeringen og anlægget er omkostning-, arbejds- og pladsforbrugende.A number of circuits and devices for monitoring either ground connections or the occurrence of residual current are also known. As these devices only monitor either earth connections or residual current, two separate devices must be used for a complete and safe monitoring of the system, which is cost, labor and space consuming for both the installation and the system.
Til grund for opfindelsen ligger den opgave at tilvejebringe enkelt og om-kostningsbesparende konstrueret beskyttelsesafbryder, med hvilken der på enkel og sikker måde konstateres dels forstyrrelser i jordledningen, som fx. beskadiget eller afbrudt eller ikke tilsluttet jordleder, og dels fejlstrømme i brugerstrømkredsen, hvorved brugerstrømkredsen omgående afbrydes fra nettet.The invention is based on the object of providing a simple and cost-saving designed circuit breaker, with which disturbances in the earth line are detected in a simple and safe manner, e.g. damaged or disconnected or not connected to earth conductor, and partly fault currents in the user circuit, whereby the user circuit is immediately disconnected from the mains.
Beskyttelsesafbryderen skal konstrueres med lille volumen, skal kunne tilsluttes vilkårlige elektriske apparater og bygningsinstallationer og skal uden mekaniske komponenter have den størst mulige sikkerhed både med hensyn til funktion og til ulykkesrisiko.The circuit breaker must be designed with a small volume, must be able to be connected to any electrical appliances and building installations and must have the greatest possible safety, both in terms of function and accident risk, without mechanical components.
Dette opnås ifølge opfindelsen ved, at indretningen til overvågning af jordingsmodstanden består af en første differentialforstærker, hvis ene indgang er forbundet til en konstant spænding, og hvis anden indgang er forbundet til jordforbindelsesledningen, som er tilsluttet en konstantstrømkilde, at indretningen til overvågning af fejlstrømmen består af en anden differentialforstærker, hvis første indgang er forbundet til en konstantstrømkilde, og hvis anden indgang er forbundet til en spænding, som er afledt fra en sumstrømtransformator, at udgangene fra differentialforstærkerne via en eller-port er forbundet med en afbryderforstærker, og at der forefindes et af afbryderforstærkeren styret belastningsrelæ.This is achieved according to the invention in that the device for monitoring the ground resistance consists of a first differential amplifier, one input of which is connected to a constant voltage, and whose second input is connected to the ground connection line, which is connected to a constant current source, that the device for monitoring the residual current consists of a second differential amplifier whose first input is connected to a constant current source and whose second input is connected to a voltage derived from a sum current transformer, that the outputs of the differential amplifiers via an or-port are connected to a switch amplifier and that there is a load relay controlled by the circuit breaker.
Derved er det muligt at konstruere en enhed, som konstant overvåger både jordingsmodstanden og fejlstrømmen og omgående afgiver en melding ved forstyrrelse af jordingsmodstanden eller forekomsten af fejlstrøm eller træffer de nød- - 3 - ί475O3 vendige frakoblingsforanstaltninger. Det drejer sig samtidig om en enkelt enhed, som kan konstrueres med små ydre dimensioner, og som er mere gunstig end to adskilte beskyttelsesindretninger både med hensyn til anskaffelsespris og indbygningsmulighed.This makes it possible to design a unit which constantly monitors both the ground resistance and the fault current and immediately issues a message in the event of a disturbance of the ground resistance or the occurrence of a fault current or takes the necessary disconnection measures. At the same time, it is a single unit which can be constructed with small external dimensions and which is more favorable than two separate protection devices both in terms of purchase price and installation option.
Endvidere foreslås det, at der i afbryderforstærkerens strømkreds ligger et relæ, hvis kontakt ligger i styrekredsen til belastningsrelæet. Dermed er det muligt at foretage de nødvendige frakoblinger på enkel måde.Furthermore, it is proposed that there is a relay in the circuit of the circuit breaker amplifier, the contact of which is in the control circuit of the load relay. This makes it possible to make the necessary disconnections in a simple way.
Det er hensigtsmæssigt, hvis sekundærviklingen i sumstrømtransformatoren via en ensretter er forbundet med en modstand foran den anden indgang i den anden differentialforstærker. Denne udformning muliggør en enkel afbryderkonstruktion med sikker funktion til opnåelse af den tilstræbte effekt ifølge opfindelsen.It is expedient if the secondary winding in the sum current transformer is connected via a rectifier to a resistor in front of the second input of the second differential amplifier. This design enables a simple switch construction with safe function to achieve the desired effect according to the invention.
Opfindelsens genstand (Fl-beskyttelsesafbryder) indeholder to adskilte, elektroniske overvågningsenheder, som via en eller-port påvirker udløsningen.The object of the invention (F1 circuit breaker) contains two separate, electronic monitoring units which, via an or-port, influence the tripping.
Den ene overvågningsenhed bestemmer den via en sumstrømtransformator konstaterede fejlstrøm og udløser belastningsrelæet, hvis fejlstrømmen vokser over en vis værdi, fortrinsvis 30mA, således at der derved sikres en pålidelig overvågning af fejlstrømme.One monitoring unit determines the residual current detected via a sum current transformer and triggers the load relay if the residual current grows above a certain value, preferably 30mA, so that a reliable monitoring of residual currents is thereby ensured.
Den anden overvågningsenhed måler jordingsmodstanden og afgiver et udløsesignal, hvis jordingsmodstanden vokser over en vis værdi, fortrinsvis over 2k ·The second monitoring unit measures the ground resistance and emits a trip signal if the ground resistance grows above a certain value, preferably above 2k ·
Det betyder, at overvågningsenheden reagerer både ved en meget dårlig jording (Rjord > 2kil) og ved en afbrudt jordledning (Rjor(j -*·“).This means that the monitoring unit reacts both with a very poor grounding (Rjord> 2kil) and with a broken earth line (Rjor (j - * · “).
Med beskyttelsesafbryderen ifølge opfindelsen opnås der uden mekaniske komponenter en sikker funktion og den størst mulige overvågning af jordingsmodstanden og fejlstrømmene, og ved forstyrrelser skilles brugerstrømkredsløbet omgående fra forsyningsnettet. Beskyttelsesafbryderen er konstrueret med lille volumen og skal kunne fremstilles enkelt og omkostningsbesparende og have en permanent sikker funktion. Beskyttelsesafbryderen skal kunne tilsluttes vilkårlige elektriske apparater og bygningsinstallationer.With the protection switch according to the invention, a safe function and the greatest possible monitoring of the earthing resistance and the fault currents is achieved without mechanical components, and in the event of disturbances, the user current circuit is immediately disconnected from the supply network. The circuit breaker is designed with a small volume and must be able to be manufactured simply and cost-effectively and have a permanently safe function. The circuit breaker must be able to be connected to any electrical appliances and building installations.
Med denne beskyttelsesafbryder fjernes farerne (strømstød og dødsfald) for menesker, således at beskyttelsesafbryderen mindsker risikoen for ulykker og har en stor brug- og nytteværdi med hensyn til menneskelig og elektrisk sikkerhed.With this circuit breaker, the dangers (shocks and deaths) of people are eliminated, so that the circuit breaker reduces the risk of accidents and has a great use and utility value in terms of human and electrical safety.
Yderligere fordelagtige udformninger fremgår af underkravene.Further advantageous designs appear from the subclaims.
Et udførelseseksempel ifølge opfindelsen beskrives nærmere i det følgende under henvisning til tegningen, på hvilken fig. 1 viser et principdiagram for beskyttelsesafbryderen.An exemplary embodiment according to the invention is described in more detail in the following with reference to the drawing, in which fig. 1 shows a principle diagram of the circuit breaker.
- 4 - U7503 fig. 2 et diagram over en udformning af beskyttelsesafbryderen, og fig. 3 et deldiagram af en udformning af beskyttelsesafbryderen med yder ligere remanensrelæ.- 4 - U7503 fig. 2 is a diagram of a design of the circuit breaker, and FIG. 3 is a partial diagram of a design of the circuit breaker with an additional residual relay.
En beskyttelsesafbryder ifølge opfindelsen omfatter en elektronisk jordingsmodstands-overvågningsenhed 10 og en elektronisk fejlstrøms-overvågningsenhed 11/ som ved hjælp af en eller-port 12 og en afbryderforstærker 13 er forbundet med et tilhørende belastningsrelæ 14 til flerpolet (alle-polet) afbrydelse af en belastningskreds 15.A protection switch according to the invention comprises an electronic earthing resistance monitoring unit 10 and an electronic residual current monitoring unit 11 / which is connected by means of an or-port 12 and a switch-off amplifier 13 to an associated load relay 14 for multipole (all-pole) disconnection of a load circuit. 15.
Ud fra en netforsyning 16 energiforsynes via en konstantstrømskilde 17 via jordingsmodstands-overvågningsenheden 10 i en jordleder 18 en konstant strøm med en lav værdi på 2,6 mA, fortrinsvis på 5 mA, og hertil overvåger jordmodstandsovervågningsenheden 10 mod en jordtilslutningspunkt 19 til en jordledning 18 spændingsfaldet eller spændingsstigningen ved hjælp af en forstærkerkobling OP , som via eller-porten 12 med afbryderforstærkeren 13 indvirker på belastningsrelæet 14 til udkobling af forbrugerstrømkredsen 15.From a mains supply 16, a constant current with a low value of 2.6 mA, preferably of 5 mA, is supplied via a constant current source 17 via a ground resistance monitoring unit 10 in a ground conductor 18, and for this purpose the ground resistance monitoring unit 10 monitors against a ground connection point 19 to a ground line 18 the voltage drop or the voltage rise by means of an amplifier coupling OP, which via the or-port 12 with the switch-on amplifier 13 acts on the load relay 14 for switching off the consumer circuit 15.
Afbryderforstærkeren 13 styrer et reed-relæ 20, hvis kontakt 21 ligger i belastningsreisset 14's strømkreds.The switch amplifier 13 controls a reed relay 20, the contact 21 of which is located in the circuit of the load travel 14.
Jordingsmodstands-overvågningsenheden 10's funktion ved afbrudt jordingsleder 18 eller ved forhøjet jordingsmodstand større end fx. 2 kOhm er følgende:The function of the earthing resistance monitoring unit 10 with interrupted earthing conductor 18 or with elevated earthing resistance greater than e.g. 2 kOhm are as follows:
Ved hjælp af konstantstrømkilden 17 tilføres der konstant strøm på 5 mA til stadighed til jordlederen 18. Spsendingsfaldet fremkaldt af jordingsmodstanden tilføres sammenligningstrinnet OPj, hvis tærskelværdi er indstillet til fx.By means of the constant current source 17, a constant current of 5 mA is constantly supplied to the earth conductor 18. The voltage drop induced by the earth resistance is applied to the comparison stage OPj, the threshold value of which is set to e.g.
10 Volt. Denne spænding er tilført til den negative indgang på ΟΡχ, og spændingen på denne indgang stiger herved til en spændingsværdi på over 10 Volt, og udgangen på ΟΡχ kipper til lavere spændingstilstand. Via eller-porten 12 udløses ved hjælp af impulsen adskillelsen af forbrugerstrømkredsen 15 til forbrugeren 25 fra nettet.10 Volt. This voltage is applied to the negative input of ΟΡχ, and the voltage at this input rises to a voltage value above 10 volts, and the output of på switches to a lower voltage state. Via the or gate 12, the separation of the consumer circuit 15 to the consumer 25 from the network is triggered by means of the pulse.
Fejlstrøms-overvågningsenheden 11 består af en sumstrømstransformator 22, hvis sekundærvikling via en ensretter 23 er forbundet med en forstærker OP2 i fejlstrøms-overvågningsenheden 11, hvis udgang via eller-porten 12 er tilsluttet til afbryderforstærkeren 13.The residual current current monitoring unit 11 consists of a sum current transformer 22, the secondary winding of which is connected via a rectifier 23 to an amplifier OP2 in the residual current current monitoring unit 11, the output of which is connected to the switch amplifier 13 via the or-port 12.
Funktionen af fejlstrøms-overvågningsenheden 11 er følgende:The function of the residual current monitoring unit 11 is as follows:
Flyder der i forbrugerstrømkredsen 15 en fejlstrøm, så registreres denne i sumstrømstransformatoren 22· Den i viklingen N3 inducerede vekselspænding ens-rettes ved hjælp af Gj, udglattes og tilkobles via en modstand Rg til den nega- 147503 - 5 - tive indgang på en som sammenligningstrin koblet operationsforstærker OP2. Herved bliver differencespændingen imellem indgangene på OP2 større end nul og udgangen på OP2 kipper til den lavere spændingstilstand. Via eller-koblingen D7,If a residual current flows in the consumer circuit 15, it is registered in the sum current transformer 22 · The alternating voltage induced in the winding N3 is rectified by means of Gj, smoothed and connected via a resistor Rg to the negative input at a comparative stage. coupled operational amplifier OP2. As a result, the difference voltage between the inputs on OP2 becomes greater than zero and the output on OP2 tilts to the lower voltage state. Via the or connection D7,
Dg og Ri 3 ankommer impulsen til et afbryderforstærkertrin T2 og spærrer dette trin.Dg and Ri 3 arrive at the pulse of a switch amplifier stage T2 and block this stage.
Det forud magnetiserede reed-relæ 20 i kollektoren på en transistor TRi falder fra. Via dets arbejdskontakt åbnes styrekredsen for belastningsrelæet 14, og forbrugerstrømkredsen 15 til forbrugeren 25 adskilles. Indkobling ved afbryderen 24 kan først atter finde sted, når fejlen er ophævet.The pre-magnetized reed relay 20 in the collector of a transistor TRi drops off. Via its operating switch, the control circuit for the load relay 14 is opened and the consumer circuit 15 for the consumer 25 is separated. Switching on at switch 24 can only take place again when the fault has been eliminated.
Beskyttelsesafbryderen ifølge opfindelsen egner sig som såkaldt Fl-beskyt-telsesafbryder til elektriske apparater, navnlig til svømmeafbrydere, der anvendes som afbryderorgan til undervandspumper, afspærringsskydere eller lignende samt til beskyttelsesjording af hustilslutninger.The protection switch according to the invention is suitable as a so-called F1 protection switch for electrical appliances, in particular for float switches used as switching means for underwater pumps, shut-off sliders or the like, as well as for protective earthing of house connections.
En videre udformning af beskyttelsesafbryderen opnås ved anbringelse af et remanensrelæ (fig. 3), som har to viklinger BH I og EH II, og hvis kontakt rh skiftevis ved magnetisering af viklingerne RH I og RH II er ud- og indkoblelig. Kontakten rh bevarer sin afbrydertilstand også, når magnetiseringen af viklingerne RH I henholdsvis RH II udkobles, dvs. remanensrelæet oplagrer den respektive tilstand også ved strømsvigt.A further design of the circuit breaker is obtained by arranging a residual relay (Fig. 3), which has two windings BH I and EH II, and whose contact rh is alternately switched on and off by magnetizing the windings RH I and RH II. The contact rh also retains its switching state when the magnetization of the windings RH I and RH II, respectively, is switched off, ie. the residual relay also stores the respective state in the event of a power failure.
Viklingen RH I er indskudt i kollektorstrømkredsen på en transistor T2 i afbryderforstærkeren. Viklingen RH II er med den ene tilslutning ligesom viklingen RH I tilstluttet til den positive spænding på en netforsyningsenhed 26 for beskyttelsesafbryderen, medens viklingens anden tilslutning via en taster "S-ind" (arbejdskontakt) er tilsluttet til den jordede negative pol på netforsyningsenheden.The winding RH I is inserted in the collector circuit of a transistor T2 in the circuit breaker. The winding RH II is with one connection just as the winding RH I is connected to the positive voltage on a mains supply unit 26 for the circuit breaker, while the other connection of the winding is connected via a key "S-in" (working contact) to the grounded negative pole on the mains supply unit.
Ved optræden af en fejlstrøm og aktivering af fejlstrøms-overvågningsforstærkeren 0P2 åbnes ved magnetisering af remanenrelæet RH's vikling RH I kontakten rh, belastningsrelæet 14 falder fra, og ved åbning af afbryderen 14a skilles belastningen (forbruger 25) fra netforsyningen 16. Ved udbedring af fejlen magnetiseres ved aktivering af tasteren "S-ind" remanensrelæets vikling RH II, og herved sluttes kontakten rh, belastningsrelæet magnetiseres, og belastningen tilsluttes ved slutning af afbryderen 14a atter til netforsyningen 16. Den rette funktion af fejlstrømsovervågningen kan afprøves ved hjælp af en taster "PR-S" ved sumstrømstransformatoren 22 på kendt måde. En signallampe viser belastningsrelæet 14's koblingstilstand.Upon the occurrence of a residual current and activation of the residual current monitoring amplifier 0P2, the magnetization of the residual relay RH RH in the contact rh opens, the load relay 14 drops off, and when the switch 14a is opened, the load (consumer 25) is disconnected from the mains supply. by activating the key "S-in" the winding RH II of the residual relay, thereby closing the switch rh, the load relay is magnetized and the load is reconnected at the end of the switch 14a to the mains supply 16. The correct function of the residual current monitoring can be tested by means of a "PR -S "at the sum current transformer 22 in a known manner. A signal lamp indicates the switching state of the load relay 14.
- 6 - 147503- 6 - 147503
Den særlige fordel ved den beskrevne kobling med remanensrelaet PH består i, at ved strømsvigt i netforsyningen asidres remanensrelæet PH's sidste tilstand ikke (lagringsvirkning). I normaltilfældet (uden fejlstrøm) forbliver rh-kontak-ten sluttet, og ved tilbagevenden af netspændingen er også tilsikret beredskab og funktioneren af beskyttelsesafbryderen. Efter optræden af en fejlstrøm kan beredskabet kun atter tilvejebringes manuelt ved aktivering af tasteren "S-ind".The particular advantage of the described coupling with the residual relay PH is that in the event of a power failure in the mains supply, the last state of the residual relay PH is not acidified (storage effect). In the normal case (without residual current), the rh switch remains closed, and when the mains voltage returns, emergency preparedness and the operation of the circuit breaker are also ensured. After the occurrence of a fault current, the standby mode can only be provided manually again by activating the "S-in" key.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2508979 | 1975-03-01 | ||
| DE19752508979 DE2508979C2 (en) | 1975-03-01 | 1975-03-01 | Arrangement for a circuit breaker with a fault current monitoring unit and an earthing resistance monitoring unit |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK80476A DK80476A (en) | 1976-09-02 |
| DK147503B true DK147503B (en) | 1984-09-03 |
| DK147503C DK147503C (en) | 1985-10-21 |
Family
ID=5940204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK80476A DK147503C (en) | 1975-03-01 | 1976-02-26 | PROTECTION SWITCH CIRCUIT |
Country Status (10)
| Country | Link |
|---|---|
| AT (1) | AT345927B (en) |
| BE (1) | BE839019A (en) |
| CH (1) | CH604366A5 (en) |
| DE (1) | DE2508979C2 (en) |
| DK (1) | DK147503C (en) |
| FR (1) | FR2303369A1 (en) |
| GB (1) | GB1543050A (en) |
| IT (1) | IT1057278B (en) |
| NL (1) | NL7602011A (en) |
| SE (1) | SE419013B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3338820A1 (en) * | 1983-10-26 | 1985-05-15 | Robert Krups Stiftung & Co KG, 5650 Solingen | ELECTRICAL CONNECTION DEVICE, LIKE SOCKET, WITH FAULT CURRENT SWITCH FOR ELECTRICAL CONSUMERS |
| DE3505718A1 (en) * | 1984-04-11 | 1985-10-17 | Hartmann & Braun Ag, 6000 Frankfurt | Arrangement having converter-current tripping in the tripping circuit of protection relays for AC networks |
| DE3803582A1 (en) * | 1988-02-06 | 1989-08-17 | Licentia Gmbh | Mains connection with overvoltage (surge) protection |
| FR2642846B1 (en) * | 1989-02-06 | 1991-07-12 | Forclum Force Lumiere Elect | METHOD AND DEVICE FOR MONITORING THE EARTHINGS OF AN ELECTRICAL INSTALLATION |
| GB2276991A (en) * | 1993-03-22 | 1994-10-12 | B & R Electrical Plc | Protection circuit responsive to several sensors |
| DE19601880A1 (en) * | 1996-01-19 | 1997-07-24 | Siemens Ag | Load network arrangement with PE conductor for protection of electrical devices from electric shock hazard |
| DE29600914U1 (en) * | 1996-01-19 | 1996-03-28 | Siemens AG, 80333 München | Monitoring arrangement |
| DE19640345A1 (en) * | 1996-09-20 | 1998-03-26 | Siemens Ag | Power supply circuit for an electronic trigger circuit |
| DE102008005687A1 (en) * | 2008-01-23 | 2009-08-06 | Siemens Aktiengesellschaft | Control device for safe reconnection of a residual current circuit breaker |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3654515A (en) * | 1969-06-26 | 1972-04-04 | Chubu Seiki Kk | Leakage current interrupting apparatus |
| US3611035A (en) * | 1970-06-08 | 1971-10-05 | Rucker Co | Ground fault protective system having grounded neutral protection |
| US3713003A (en) * | 1971-02-16 | 1973-01-23 | Purex Corp Ltd | Fault or leak detector |
| FR2191319B1 (en) * | 1972-06-29 | 1976-03-12 | Radiotechnique Compelec | |
| GB1455845A (en) * | 1973-02-27 | 1976-11-17 | Square D Co | Ground fault protection system |
| IT1010294B (en) * | 1973-06-11 | 1977-01-10 | Rca Corp | CIRCUIT FOR DETECTION OF FAULTS BETWEEN GRID AND EARTH AND BETWEEN NEUTRAL AND EARTH |
-
1975
- 1975-03-01 DE DE19752508979 patent/DE2508979C2/en not_active Expired
- 1975-04-07 AT AT262875A patent/AT345927B/en not_active IP Right Cessation
-
1976
- 1976-02-23 SE SE7602164A patent/SE419013B/en not_active IP Right Cessation
- 1976-02-25 CH CH235176A patent/CH604366A5/xx not_active IP Right Cessation
- 1976-02-26 DK DK80476A patent/DK147503C/en not_active IP Right Cessation
- 1976-02-27 NL NL7602011A patent/NL7602011A/en not_active Application Discontinuation
- 1976-02-27 FR FR7605520A patent/FR2303369A1/en active Granted
- 1976-02-27 BE BE164712A patent/BE839019A/en not_active IP Right Cessation
- 1976-03-01 GB GB800476A patent/GB1543050A/en not_active Expired
- 1976-03-01 IT IT4835676A patent/IT1057278B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT1057278B (en) | 1982-03-10 |
| DE2508979A1 (en) | 1976-09-09 |
| SE7602164L (en) | 1976-09-02 |
| DK147503C (en) | 1985-10-21 |
| FR2303369A1 (en) | 1976-10-01 |
| DE2508979C2 (en) | 1984-07-12 |
| NL7602011A (en) | 1976-09-03 |
| GB1543050A (en) | 1979-03-28 |
| DK80476A (en) | 1976-09-02 |
| FR2303369B1 (en) | 1981-11-20 |
| AT345927B (en) | 1978-10-10 |
| ATA262875A (en) | 1978-02-15 |
| BE839019A (en) | 1976-08-27 |
| CH604366A5 (en) | 1978-09-15 |
| SE419013B (en) | 1981-07-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PBP | Patent lapsed |