WO1999054978A1 - Disjoncteur a courant differentiel - Google Patents

Disjoncteur a courant differentiel Download PDF

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Publication number
WO1999054978A1
WO1999054978A1 PCT/DE1999/001108 DE9901108W WO9954978A1 WO 1999054978 A1 WO1999054978 A1 WO 1999054978A1 DE 9901108 W DE9901108 W DE 9901108W WO 9954978 A1 WO9954978 A1 WO 9954978A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit breaker
circuit
relay
power supply
breaker according
Prior art date
Application number
PCT/DE1999/001108
Other languages
German (de)
English (en)
Inventor
Bernhard Bauer
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1999054978A1 publication Critical patent/WO1999054978A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/008—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for protective arrangements according to this subclass
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/32—Energising current supplied by semiconductor device
    • H01H47/325—Energising current supplied by semiconductor device by switching regulator

Definitions

  • the invention relates to a residual current circuit breaker with a summation current transformer which monitors a conductor network and which is connected to a trip circuit which is connected to a power pack and which triggers a trip relay for actuating a circuit breaker.
  • Such a residual current circuit breaker is used to ensure protection against dangerous body current in an electrical system. This is the case, for example, when a person touches a live part of an electrical system. The fault current then flows through the person as body current against earth. The circuit breaker used to protect against dangerous body currents safely and quickly disconnects the affected circuits from the mains if the rated fault current is exceeded.
  • the DI circuit breaker is made up of three modules: A summation current transformer, through whose transformer core all current-carrying conductors of a conductor network are led, induces in its secondary winding in the event of a Fault current, a voltage signal that drives a tripping circuit connected to the secondary winding.
  • the tripping circuit is in turn coupled via a tripping relay to a relay coil with a switching lock, via which 2
  • the DI circuit breaker takes the energy required for tripping from a supply source, depending on the mains voltage, while the Fl circuit breaker takes the energy required for tripping from the fault current itself, regardless of the mains voltage.
  • the DI trigger circuit of the D / S switch or D / A additive is supplied with the signal emitted by the summation current transformer via an auxiliary energy-dependent electronic unit, which is fed by a power supply unit connected to the conductor network, when a fault current occurs.
  • the electronics unit is part of the trip circuit and usually has an amplifier and a rectifier as well as a trip time delay.
  • a test device is provided with a test button, which is usually connected between the neutral conductor (N) and a phase conductor (L1, L2, L3) of the conductor network.
  • N neutral conductor
  • L1, L2, L3 phase conductor
  • the power supply unit In order to interrupt the power supply to the trip relay at least when the circuit breaker is triggered reliably and when the contact opens, the power supply unit is connected behind the circuit breaker in the feed direction and thus on the load side of the circuit breaker. This limits the connection options on site and, in the event of connection errors, often leads to the destruction of the di-addition or circuit breaker. In particular, when the tripping relay is installed on site in the circuit breaker, the trip relay is destroyed after pressing the test button for the purpose of an installation check if the power supply unit is connected to the conductor network in front of the circuit breaker in the feed direction and the feed direction has thus been exchanged.
  • the invention is therefore based on the object of specifying a residual current circuit breaker which, irrespective of the feed direction, is non-destructive and functional even in the event of the circuit breaker not tripping.
  • the release relay coil of the DI circuit breaker or add-on is connected to the power supply unit via a controllable electronic switch which 4 Control of the trip circuit is switched to be pulsatingly conductive by means of a control circuit.
  • Such a brief, repetitive tripping of the tripping relay as a result of a fault current detected by the summation current transformer and processed by the tripping circuit prevents overloading of the relay coil and thus destruction of the tripping relay even if the tripping condition after the mains supply is connected to the DC circuit breaker or add-on contact opening of the circuit breaker is maintained, or if there is no immediate contact opening of the circuit breaker when the trip relay is triggered.
  • the control circuit of the electronic switch is only conductively controlled for a triggering or triggering time required to trigger the trigger relay, preferably plus a safety period. The electronic switch is then expediently blocked for a specifiable pause time within which the tripping relay is separated from the power supply unit and thus the relay coil is not energized.
  • the tripping time is limited to less than or equal to 40 ms, the tripping time of the tripping relay must be less than 40 ms.
  • the triggering time of the tripping relay plus a safety time is therefore advantageously in the range between 5ms and 100ms.
  • the use of a tripping relay with a tripping current less than or equal to 100mA results in a ratio of the pause time to the actuation time of approximately 10 (t P / t A «10).
  • the power loss in the power pack in particular with regard to a high ambient temperature, is limited to a level that can be controlled in the usual construction volumes of such circuit breakers. This is particularly important if, according to a preferred embodiment, the release relay coil is connected downstream of the power supply via a power supply regulator.
  • the control circuit is preferably constructed from a comparator and a flip-flop, the output signals of which are logically linked to control the electronic switch.
  • the comparator and the flip-flop are expediently connected to one another on the output side via an AND gate composed of two NAND gates, which in turn is connected to the control input of the electronic switch.
  • a flip-flop a precision Schmitt trigger made up of two comparators with a downstream NAND gate is expediently provided. Such a precision Schmitt trigger is described, for example, in “semiconductor circuit technology”, U. Tietze / Ch. Schenk, 6th edition, Springer-Verlag (1983), page 183.
  • control circuit can be constructed from only one comparator, which is connected on the output side to the control input of the electronic switch via an onostable multivibrator.
  • the electronic switch is advantageously a bipolar transistor, preferably a MOS field effect transistor (Mosfet). Such a Mosfet is described, for example, in “Semiconductor Circuit Technology”, U. Tietze / Ch. Schenk, 6th Edition, Springer-Verlag (1983), page 83f.
  • the pulse-like control of the tripping relay thus enables free selection of the connection side of the power supply unit of the residual current circuit breaker in the feed direction in front of or behind the circuit breaker to the conductor network. Destruction of electronic components of the residual current circuit breaker or the trip relay coil is in the above
  • FIG. 1 schematically shows the structure of a DC circuit breaker with a feed-in and repetitive control of a trigger relay
  • FIG. 2 shows the circuit structure of the trigger relay control according to FIG. 1.
  • Ln a single- or multi-phase conductor network
  • the secondary winding 4 of the summation current transformer 2 is connected to a tripping circuit 5, in which a control circuit 6 with a controllable electronic switch 7 is integrated.
  • the electronic switch 7 is designed as a bipolar npn transistor.
  • a power supply unit 8 connected to the conductor network Ln with a protective circuit 9 and a rectifier 10 as well as a power supply regulator 11 serves to supply the trigger circuit 5 with voltage and a trigger relay 12 controlled by this via the control circuit 6.
  • This in turn is coupled to a mechanism in the form of a switch lock 13 which acts on a circuit breaker 14 located in the or each phase line L1, L2, L3 and in the neutral conductor N of the conductor network Ln.
  • the power supply takes place on the side of the circuit breaker 14 facing away from a load or a consumer 15.
  • the power supply unit 8 - seen in the feed direction 16 - can be connected to the conductor network Ln both upstream and downstream of the circuit breaker 14 without the trigger relay 12 or electronic components of the trip circuit 5 are destroyed as a result of an overload when the trip is triggered.
  • Both the trigger relay 12 and the trigger circuit 5 and the control circuit 6 are connected to the power supply 8 behind the power supply regulator 11.
  • the trigger relay 12 is connected on the collector side to the transistor 7, which is connected to ground on the emitter side.
  • the vectorial sum of the currents flowing in and out of the conductor network Ln is zero.
  • the transformer core 3 is magnetized in accordance with the level of the fault current, so that a voltage is induced in the secondary winding 4 of the summation current transformer 2.
  • An input voltage U E (FIG. 2) generated from the fault current in the trip circuit 5 is converted by means of the trip circuit 6 into a trip or control signal S a in the form of a control pulse which switches the electronic switch 7 in a pulsatingly conductive manner.
  • the relay coil of the trigger relay 12 is briefly flowed through by current.
  • the contacts of the circuit breaker 14 are opened via the switching lock 16 and the defective system part is thereby switched off.
  • the switch 7 is activated again and briefly turned on. As a result, the functional reliability of the trip circuit 5 and / or the trip relay 12 is ensured independently of both the grid feed-in and the trip of the circuit breaker 14.
  • the control circuit 6 comprises a comparator VI connected in the manner shown with resistors R1 and R2 and a comparator VI
  • Toggle stage 17 This is made up of two comparators V2 and V3 and these two NAND gates N3 and N4, which together form a precision Schmitt trigger.
  • the comparator VI is followed by an AND gate composed of two NAND gates N1, N2, the NAND gate N1 of which logically combines the output signals S1, S2 of the comparator VI or the flip-flop 17.
  • the NAND gate N2 is connected to the control input E s of the transistor V4 via a resistor R3.
  • the 10 drain-source channel of the transistor V4 is connected to an operating voltage U B via the trigger relay 12 and a freewheeling diode D1 connected in parallel with it.
  • the freewheeling diode Dl serves to avoid voltage peaks in the event of a current interruption in the relay coil of the trigger relay 12.
  • the NAND gate N2 is on the output side via the circuit shown of a diode D3 and two resistors R5, R6 and a capacitor C2 with the (-) - Inputs of the comparators V2, V3 connected.
  • the diode D3 is used to decouple the RC element C2, R5, R6.
  • the voltage U c across the capacitor C2 is compared in the comparators V2, V3 with a reference voltage U Ref2 and U Ref3 at their (+) inputs.
  • the capacitor C2 is discharged, so that the voltage U c is less than the reference voltages U Re f 3 .
  • the output of the comparator V2 is high, the output of the comparator V3 is low, the output of the NAND gate N3 is low and the output of the NAND gate N4 is high.
  • the output of the comparator VI changes from low to high level and thus the output of the NAND -Gatters N2 also from low to high level.
  • the corresponding control signal S a controls the transistor V4 in a conductive manner and the relay coil of the trigger relay 12 is connected to the operating voltage U B.
  • a relay coil current I R thus flows via the relay coil of the trigger relay 12, so that the circuit breaker 14 is triggered.
  • capacitor C2 is charged via diode D3 and resistor R5.
  • the precision Schmitt trigger formed from the comparators V2 and V3 and the NAND gate N3, N4 can also be replaced by a comparator with high hysteresis (> 1V) Be 12. In contrast to the repetitive control of the comparators V2 and V3 and the NAND gate N3, N4 can also be replaced by a comparator with high hysteresis (> 1V) Be 12. In contrast to the repetitive control of the comparators V2 and V3 and the NAND gate N3, N4 can also be replaced by a comparator with high hysteresis (> 1V) Be 12. In contrast to the repetitive control of the

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

Abstract

L'invention concerne un disjoncteur à courant différentiel comportant un transformateur-totalisateur de courant (2) qui surveille un réseau en échelle (Ln). Ce transformateur est raccordé à un circuit de déclenchement (5) relié à un bloc d'alimentation (8) et commandant un relais de déclenchement (12) pour actionner un commutateur de puissance (14). L'invention vise à permettre le fonctionnement d'un tel disjoncteur indépendamment de la direction d'alimentation et de façon protégée contre les surtensions dans le cas d'un non déclenchement du commutateur de puissance (14). A cet effet, le relais de déclenchement (12) est raccordé au bloc d'alimentation (8) par l'intermédiaire d'un commutateur électronique (7) qui est commuté de façon conductrice et pulsée, au moyen d'un circuit de commande (6), lors de la commande du relais de déclenchement (5).
PCT/DE1999/001108 1998-04-22 1999-04-14 Disjoncteur a courant differentiel WO1999054978A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19818055.1 1998-04-22
DE1998118055 DE19818055A1 (de) 1998-04-22 1998-04-22 Differenzstrom-Schutzschalter

Publications (1)

Publication Number Publication Date
WO1999054978A1 true WO1999054978A1 (fr) 1999-10-28

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ID=7865489

Family Applications (1)

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PCT/DE1999/001108 WO1999054978A1 (fr) 1998-04-22 1999-04-14 Disjoncteur a courant differentiel

Country Status (2)

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DE (1) DE19818055A1 (fr)
WO (1) WO1999054978A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114400167A (zh) * 2021-12-16 2022-04-26 阳光电源股份有限公司 电气***、接口装置以及接口电路及其导通方法和关断方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015004541A1 (de) * 2015-04-08 2016-10-13 Doepke Schaltgeräte GmbH Fehlerstrom-Schutzeinrichtung mit zusätzlicher Auslösefunktion

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700967A (en) * 1972-01-10 1972-10-24 Zinsco Electrical Products Ground fault detector circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2622368B1 (fr) * 1987-10-23 1993-04-30 Serd Soc Et Realisa Disjonct Interrupteur differentiel selectif a courant de defaut
DE4142970A1 (de) * 1991-12-24 1993-07-01 Abb Patent Gmbh Fehlerstrom- und/oder differenzstromschutzschalter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700967A (en) * 1972-01-10 1972-10-24 Zinsco Electrical Products Ground fault detector circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114400167A (zh) * 2021-12-16 2022-04-26 阳光电源股份有限公司 电气***、接口装置以及接口电路及其导通方法和关断方法

Also Published As

Publication number Publication date
DE19818055A1 (de) 1999-10-28

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