EP0320411A1 - Fehlerstromschutzschalter - Google Patents

Fehlerstromschutzschalter Download PDF

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Publication number
EP0320411A1
EP0320411A1 EP88420402A EP88420402A EP0320411A1 EP 0320411 A1 EP0320411 A1 EP 0320411A1 EP 88420402 A EP88420402 A EP 88420402A EP 88420402 A EP88420402 A EP 88420402A EP 0320411 A1 EP0320411 A1 EP 0320411A1
Authority
EP
European Patent Office
Prior art keywords
trip unit
differential
differential trip
pole
terminals
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.)
Granted
Application number
EP88420402A
Other languages
English (en)
French (fr)
Other versions
EP0320411B1 (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, said terminals being connected in pairs by conductors in which the cut-off contacts of the cut-off unit are inserted, 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 breaking contacts when an earth fault occurs.
  • a differential trip unit of the type mentioned associated with a breaking 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 achieve three-pole or four-pole differential protection devices.
  • the differential trip unit according to the invention is characterized in that the differential trip unit has four active conductors, each having a first end and a second end, and that the first ends of three active conductors are connected to three aligned external terminals of the differential trip unit. , that 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 separated 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 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 attached to 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:
  • 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 unit 46 is attached to the face 38 of the trip unit 12 carrying the terminals 34, this auxiliary unit 46 being disposed opposite the fourth pole 44 of the circuit breaker unit 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.
  • the differential transformer 24 is traversed by the four conductors of the four-pole circuit breaker 42 and provides differential protection of the four-pole installation protected by the circuit breaker 42.
  • the external contour of the auxiliary block 46 corresponds of course to that of the trip unit 12 and the circuit breaker block 10. It should be noted that by combining the differential trip block 12 according to the invention, an auxiliary block 46 of negligible cost, 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 unit 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.
  • Other arrangements, in particular of the auxiliary unit 46 are conceivable and the invention is of course in no way limited to the mode of implementation more particularly described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Breakers (AREA)
EP88420402A 1987-12-10 1988-12-01 Fehlerstromschutzschalter Expired - Lifetime EP0320411B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=9357859

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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4121610A1 (de) * 1991-06-29 1993-01-21 Kloeckner Moeller Gmbh Ausloese- und meldeeinrichtung, insbesondere fuer ein zusatzmodul zur erdschlusserfassung
DE29704168U1 (de) * 1997-03-07 1998-07-09 Siemens Ag Fehlerstromschutzschalter für den Betrieb von Stromkreisen mit der Schutzart Nullung

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US5892449A (en) * 1991-06-28 1999-04-06 Square D Company Electrical distribution system with an external multiple input and status unit
DE4337254B4 (de) * 1993-11-02 2005-05-19 Aeg Niederspannungstechnik Gmbh & Co Kg Fehlerstrommodul, der mit Leitungsschutzschaltern zusammensetzbar ist
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FR2377749A7 (fr) * 1977-01-14 1978-08-11 Licentia Gmbh Disjoncteur de courant de fuite combine avec un interrupteur automatique multipolaire
DE7811589U1 (de) * 1978-04-18 1979-10-11 Schiele Kg, 7746 Hornberg Schutzschalter
DE7637590U1 (de) * 1976-12-01 1981-12-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Mit einem Leitungsschutzschalter kombinierter Fehlerstromschutzschalter

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DE7811589U1 (de) * 1978-04-18 1979-10-11 Schiele Kg, 7746 Hornberg Schutzschalter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4121610A1 (de) * 1991-06-29 1993-01-21 Kloeckner Moeller Gmbh Ausloese- und meldeeinrichtung, insbesondere fuer ein zusatzmodul zur erdschlusserfassung
DE29704168U1 (de) * 1997-03-07 1998-07-09 Siemens Ag Fehlerstromschutzschalter für den Betrieb von Stromkreisen mit der Schutzart Nullung

Also Published As

Publication number Publication date
DE3883178D1 (de) 1993-09-16
EP0320411B1 (de) 1993-08-11
US4937706A (en) 1990-06-26
JP2907846B2 (ja) 1999-06-21
DE3883178T2 (de) 1994-03-10
FR2624666B1 (de) 1990-04-06
JPH01251532A (ja) 1989-10-06
FR2624666A1 (de) 1989-06-16
CA1297932C (en) 1992-03-24

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