EP0320411B1 - Fehlerstromschutzschalter - Google Patents

Fehlerstromschutzschalter Download PDF

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Publication number
EP0320411B1
EP0320411B1 EP88420402A EP88420402A EP0320411B1 EP 0320411 B1 EP0320411 B1 EP 0320411B1 EP 88420402 A EP88420402 A EP 88420402A EP 88420402 A EP88420402 A EP 88420402A EP 0320411 B1 EP0320411 B1 EP 0320411B1
Authority
EP
European Patent Office
Prior art keywords
ground fault
trip unit
fault trip
unit
pole
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 - Lifetime
Application number
EP88420402A
Other languages
English (en)
French (fr)
Other versions
EP0320411A1 (de
Inventor
Pierre Schueller
Gilbert Garnier
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin 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 Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0320411A1 publication Critical patent/EP0320411A1/de
Application granted granted Critical
Publication of EP0320411B1 publication Critical patent/EP0320411B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/1009—Interconnected mechanisms
    • H01H2071/1036—Interconnected mechanisms having provisions for four or more poles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/002—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00 with provision for switching the neutral conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/08—Terminals; Connections
    • H01H71/082—Connections between juxtaposed circuit breakers

Definitions

  • the invention relates to a differential trip unit with molded housing capable of being attached to a molded housing of a cut-off block to constitute a device for protection against earth fault currents, said cut-off block having, aligned on one of its faces, external terminals and on the opposite face of the internal terminals for connection to the differential trip unit, each of the external terminals being connected to a corresponding internal terminal by conductors in which the block cut-off contacts are inserted cut-off, said differential trip unit comprising a differential transformer crossed by several active conductors constituting the primary windings of the transformer, the secondary winding of which electromechanically controls the opening of the cut-off contacts when an earth fault occurs, the differential trip unit comprising four active conductors each having u do first end and a second end.
  • a differential trip unit of the kind mentioned is sold under the name "VIGICOMPACT” and for example shown on page 85 of the "low voltage distribution catalog” of Merlin Gerin, 1986.
  • Such a trip unit associated with a switching device, in particular an electrical circuit breaker or switch gives this device differential protection properties.
  • the advantages of reducing the manufacturing and storage costs of such modular systems are well known, and they are all the more important as the number of standard elements is limited.
  • the present invention aims to allow the realization of a differential trip unit usable in different combinations with standard switches or circuit breakers to make three-pole or four-pole differential protection devices.
  • the differential trip unit according to the invention is characterized in that the first ends of three active conductors are connected to three aligned external terminals of the differential trip unit, than the second ends of said three active conductors are aligned on a first face of the housing of the differential trip unit to allow connection to said internal terminals of the cut-off unit and the first and second ends of the fourth conductor are connected to terminals arranged on a second face of the housing of the differential trip unit different from the first face.
  • the differential trip unit is of the three-pole type, but it has a fourth active conductor passing through the differential transformer and connected to terminals separate from the terminals of the other three conductors.
  • This differential trip unit can be associated with a cut-off unit, in particular with a circuit breaker or switch with molded case of the three-pole type, the cases of course having conjugate shapes and assembly means allowing the installer or the user to fix one of the blocks on the other.
  • This device can be used in a three-pole installation in which the neutral conductor is not distributed, and in this case the fourth active conductor of the differential trip unit is unused. The additional cost due to this fourth conductor installed during the manufacture of the differential trip unit is minimal, and is largely offset by the possibility of using the same unit for other combinations.
  • the same device is suitable for a three-phase installation with distributed neutral but not cut.
  • the neutral conductor is in this case connected to the fourth conductor of the differential trip unit, so that the differential transformer adds up the currents flowing through the four conductors.
  • the differential trip unit according to the invention For the production of a four-pole device with neutral conductor cut-off, it suffices to associate the differential trip unit according to the invention with a four-pole cut-off device by connecting the fourth pole of the cut-off device to the fourth conductor of the trip unit differential.
  • the size of the four-pole switching device is of course larger than that of the differential trip unit and it is advantageous to house the connecting conductors of the fourth conductor in an auxiliary unit, of conjugate shape, to maintain a harmonious external appearance.
  • the mechanical assembly and the electrical connection of the two blocks can be carried out by any operating means, for example by latching systems and connection terminals.
  • the invention is described below in its preferred application of a differential trip unit attached to the face of the breaking device carrying the connection terminals of the circuit breaker or of the switch, but it is clear that any other arrangement is conceivable, the advantage of a standard differential trip unit allowing its association with a three-pole or four-pole breaking device being retained.
  • the differential trip unit may include input and output terminals or preferably input conductors leaving the trip unit and capable of being connected to the terminals of the breaking device during assembly of the latter, to the differential trip unit.
  • a three-pole electric circuit breaker 10 with molded case is associated with a differential trip unit 12, the shapes of the faces joined in two blocks 10, 12 being combined.
  • the circuit breaker 10 can be a switch or any other breaking device, having input terminals 14 for the connection of the external conductors 16 and output terminals 18, the latter being arranged on the face receiving the differential trip unit 12 by attachment. to allow an internal connection between the two blocks 10,12.
  • the circuit breaker 10 may include a manual control lever 20 and, in the usual way, overload or short-circuit detectors causing the automatic opening of the contacts 22 inserted in the conductors connecting the input terminals 14 to the output terminals 18
  • the circuit breaker 10 is a standard device generally used independently of a differential unit 12 to protect an installation.
  • a differential transformer 24 in the form of a torus crossed on the one hand, by three conductors 26, the ends of which are connected to external terminals 28 aligned on one of the faces 30 of the trip unit 12, and on the other hand by a fourth conductor 32, the two ends of which are connected to two terminals 34.
  • the opposite ends of the three conductors 26 pass through the face 36 adjoining the circuit breaker block 10 to be connected to the internal terminals 18 of the circuit breaker block 10.
  • the face 30 carrying the external terminals 28 is opposite the adjoining face 36 and these terminals 28 as well as the ends of the conductors 26 connected to the terminals 18 of the circuit breaker block are regularly spaced and aligned along these faces 30, 36, in a manner well known per se.
  • the two terminals 34 of the fourth conductor 32 are arranged on a free lateral face 38 of the differential trip unit 12.
  • the differential transformer 24 has a secondary winding (not shown) which controls via a relay and a mechanical connection between the two blocks 10,12, the automatic opening of the contacts 22, upon detection of an earth fault current.
  • Such differential tripping systems are well known to specialists and it is unnecessary to describe them in detail.
  • the differential trip unit of the invention is implemented as follows: For the production of a three-pole protective device, the differential trip unit 12 is assembled to the circuit breaker unit 10, for example by simple snap-fastening, the face 36 crossed by the ends of the active conductors 26 being attached to the case of the circuit breaker unit 10 and the ends of these three active conductors 26 being electrically connected to the internal terminals 18 of the circuit breaker block 10.
  • the fourth conductor 32 is unused and it is easy to see that the differential transformer 24 provides the summation of the currents flowing through the contacts 22. The presence of the fourth conductor 32 does not increase the size of the trip unit 12.
  • the three-pole device shown in Figure 3 is suitable for example for the protection of a three-phase installation without neutral conductor.
  • the same protective device can be used for a three-phase installation with uncut neutral, shown diagrammatically in FIG. 4.
  • the neutral conductor 40 is connected to the terminals 34, so that the fourth conductor 32 is traversed by the neutral current and that the differential transformer 24 performs the summation of the phase currents 16 and neutral 40.
  • the differential trip unit 12 is assembled with a four-pole circuit breaker unit 42.
  • An auxiliary block 46 is attached to the face 38 of the trip block 12 carrying the terminals 34, this auxiliary block 46 being disposed opposite the fourth pole 44 of the circuit breaker block 42.
  • a conductor 48 for connection of the internal terminal 18 of the fourth pole 44 to the terminal 34 of the fourth conductor 32 of the trigger block 12, as well as a conductor 50 connecting the other terminal 34 to an output terminal 52 aligned with the terminals 28 of the trigger block 12.
  • auxiliary block 46 naturally corresponds to that of the trip unit 12 and of the circuit breaker block 10. It should be noted that by associating with the differential trip block 12 according to the invention, an auxiliary block 46 of a negative cost. ligable, it is possible to use this standard differential trip unit to ensure the protection of a four-pole installation.
  • the fourth conductor 32 was associated with a neutral conductor, but it is clear that any other arrangement can be used depending on the type of installation.
  • the arrangement of the blocks 10, 12 can also be different and there is shown by way of example in FIG. 6, a four-pole device with circuit breaker block 42 and differential trip block 12, arranged one beside the other, with the interposition of the auxiliary block 46.
  • This usual arrangement in miniature modular systems allows the blocks 12,42,46 to be snapped onto a profiled support rail.
  • the three conductors 26 are elongated to allow external connection to the aligned terminals 18 of the circuit breaker block 42.
  • the terminals 28 of the differential trip unit 12 may optionally be transferred to the outlet face of the three conductors 26 to carry out the departure on the face opposite the inlet in the usual manner.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Breakers (AREA)

Claims (7)

  1. Differenzstrom-Auslöseblock (12) mit Isolierstoffgehäuse zum Anbau an ein Isolierstoffgehäuse eines Abschaltblocks (10, 42) zur Bildung eines Geräts zum Schutz gegen Erdfehlerströme, wobei der genannte Abschaltblock (10, 42) an einer seiner Seiten in einer Flucht angeordnete äußere Klemmen (14) und an der gegenüberliegenden Seite innere Klemmen (18) zum Anschluß an den Differenzstrom-Auslöseblock aufweist, jede der äußeren Klemmen (14) über Leiter, in die die Abschaltkontakte (22) des Abschaltblocks integriert sind, mit der entsprechenden inneren Klemme (18) verbunden ist und der genannte Differenzstrom-Auslöseblock (12) einen Differenzstromwandler (24) umfaßt, durch den mehrere, die Primärwicklung des Stromwandlers bildende aktive Leiter (26, 32) hindurchgeführt sind, wobei die Sekundärwicklung bei Auftreten eines Erdfehlerstroms das elektromechanische Öffnen der Abschaltkontakte steuert und der Differenzstrom-Anslöseblock (12) vier aktive Leiter (26, 32) mit einem ersten und einem zweiten Anschlußende aufweist, dadurch gekennzeichnet, daß die ersten Enden von drei der genannten aktiven Leiter (26) an drei in einer Flucht liegende äußere Klemmen (28) des Differenzstrom-Auslösblocks (12) angeschlossen, die zweiten Enden der drei genannten aktiven Leiter (26) in einer Flucht auf einer ersten Gehäuseseite (36) des Differenzstrom-Auslöseblocks (12) zum Anschluß an die genannten inneren Klemmen (18) des Abschaltblocks (10, 42) angeordnet und das erste und zweite Ende des vierten aktiven Leiters (32) mit auf der zweiten Gehäuseseite (38) des Differenzstrom-Auslöseblocks (12) angeordneten Klemmen (34) verbunden sind, wobei die zweite Gehäuseseite nicht mit der ersten Gehäuseseite (36) identisch ist.
  2. Differenzstrom-Anslöseblock nach Anspruch 1, dadurch gekennzeichnet, daß die genannte erste Gehäuseseite (36) so ausgeführt ist, daß sie an die mit den inneren Klemmen (18) versehene Seite des Abschaltblocks (10, 42) angebaut werden und die genannten zweiten Anschlußenden der drei aktiven Leiter (26) in der Zusammenbau-Stellung der einzelnen Blöcke (12; 10, 42) den genannten inneren Klemmen gegenüberliegen, um so die elektrische Verbindung zu ermöglichen.
  3. Differenzstrom-Auslöseblock nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das quaderförmige Gehäuse des Differenzstrom-Auslöseblocks (12) vier, sich paarweise gegenüberliegende Seitenflächen aufweist, die drei genannten äußeren Klemmen (28) bzw. die genannten zweiten Anschlußenden auf zwei gegenüberliegenden Seiten in einer Flucht angeordnet und die Anschlußenden des vierten Leiters (32) an einer (38) der anderen Seitenflächen angebracht sind.
  4. Differenzstrom-Auslöseblock nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Breite der genannten ersten Seitenfläche (36) des Differenzstrom-Auslöseblocks (12) der Breite der gegenüberliegenden, mit den inneren Klemmen (18) versehenen Seite eines dreipoligen Abschaltblocks (10) entspricht.
  5. Verwendung eines Differenzstrom-Auslöseblocks nach irgendeinem der vorhergehenden Ansprüche zur Herstellung eines dreipoligen Schutzgeräts, dadurch gekennzeichnet, daß der genannte Differenzstrom-Anslöseblock (12) an einen dreipoligen Abschaltblock (10) angebaut ist, wobei der genannte vierte Leiter (32) ungenutzt bleibt.
  6. Verwendung eines Differenzstrom-Auslöseblocks nach einem der Ansprüche 1 bis 4 zur Herstellung eines vierpoligen Schutzgeräts mit nicht abgeschaltetem Neutralleiter, dadurch gekennzeichnet, daß der genannte Differenzstrom-Auslöseblock (12) an einen dreipoligen Abschaltblock (10) angebaut ist, wobei der Neutralleiter an den genannten vierten Leiter (32) angeschlossen ist, um diesen in den Neutralleiterkreis zu schalten.
  7. Verwendung eines Differenzstrom-Auslöseblocks nach einem der Ansprüche 1 bis 4 zur Herstellung eines vierpoligen Schutzgeräts mit abgeschaltetem Neutralleiter, dadurch gekennzeichnet, daß der genannte Differenzstrom-Anslöseblock (12) an einen vierpoligen Abschaltblock (42) angebaut ist und daß ein Hilfsblock (46) an die mit den Klemmen (34) des vierten Leiters (32) versehene genannte zweite Seitenfläche (38) des Differenzstrom-Auslöseblocks (12) angefügt ist und dem vierten Pol (44) des Schaltgeräts gegenüberliegt, wobei die Verbindung des ersten Anschlußendes des vierten Leiters mit der inneren Klemme des genannten vierten Pols sowie die Verbindung des zweiten Anschlußendes des vierten Leiters mit einer in einer Flucht mit den drei äußeren Klemmen des Differenzstrom-Auslöseblocks liegenden äußeren Klemme des Hilfsblocks durch im Innern des Hilfsblocks angeordnete Verbindungsleiter hergestellt wird.
EP88420402A 1987-12-10 1988-12-01 Fehlerstromschutzschalter Expired - Lifetime EP0320411B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8717448 1987-12-10
FR8717448A FR2624666B1 (de) 1987-12-10 1987-12-10

Publications (2)

Publication Number Publication Date
EP0320411A1 EP0320411A1 (de) 1989-06-14
EP0320411B1 true EP0320411B1 (de) 1993-08-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420402A Expired - Lifetime EP0320411B1 (de) 1987-12-10 1988-12-01 Fehlerstromschutzschalter

Country Status (6)

Country Link
US (1) US4937706A (de)
EP (1) EP0320411B1 (de)
JP (1) JP2907846B2 (de)
CA (1) CA1297932C (de)
DE (1) DE3883178T2 (de)
FR (1) FR2624666B1 (de)

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Also Published As

Publication number Publication date
CA1297932C (en) 1992-03-24
FR2624666A1 (de) 1989-06-16
JPH01251532A (ja) 1989-10-06
DE3883178D1 (de) 1993-09-16
US4937706A (en) 1990-06-26
DE3883178T2 (de) 1994-03-10
JP2907846B2 (ja) 1999-06-21
EP0320411A1 (de) 1989-06-14
FR2624666B1 (de) 1990-04-06

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