EP0033671A2 - Mehrpoliger Niederspannungsdifferentialschalter - Google Patents

Mehrpoliger Niederspannungsdifferentialschalter Download PDF

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Publication number
EP0033671A2
EP0033671A2 EP81400035A EP81400035A EP0033671A2 EP 0033671 A2 EP0033671 A2 EP 0033671A2 EP 81400035 A EP81400035 A EP 81400035A EP 81400035 A EP81400035 A EP 81400035A EP 0033671 A2 EP0033671 A2 EP 0033671A2
Authority
EP
European Patent Office
Prior art keywords
contacts
contact
differential
switch according
differential switch
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
EP81400035A
Other languages
English (en)
French (fr)
Other versions
EP0033671B1 (de
EP0033671A3 (en
Inventor
Michel Bonniau
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 EP0033671A2 publication Critical patent/EP0033671A2/de
Publication of EP0033671A3 publication Critical patent/EP0033671A3/fr
Application granted granted Critical
Publication of EP0033671B1 publication Critical patent/EP0033671B1/de
Expired 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
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals

Definitions

  • a known switch of the kind mentioned (French Patent No. 2,282,715) comprises a bar carrying contact bridges, each of which cooperates with two fixed contacts to create a double break per pole.
  • the present invention is based on the observation that the contacts constitute critical points of the switches whose evolution is poorly controlled and whose contact resistance is a cause of heating by the Joule effect of the device.
  • the impact of the contacts on the cost of the device is not negligible, especially when the contacts include silver-based pads.
  • the invention aims to avoid the aforementioned drawbacks and to allow the production of an economical differential switch with improved performance.
  • each contact arm is elastically semi-fixed mounted on the bar to be able to perform a limited relative movement of pivoting and translation said arm extending on either side of the bar and carrying at one of its ends the movable contact capable of cooperating with the fixed fixed contact, the opposite end of the arm being connected by a braid to a terminal of the device and being capable of moving freely, a stop unidirectionally limiting the movement of said opposite end in the closing direction of the contacts.
  • the stop cooperating with the contact arm is in slight projection so that the contact arm comes at the end of the translational movement in abutment and subsequently pivots to close the contacts.
  • the insulating box of parallelepiped shape is formed by the superposition of a base, an intermediate support block and a shutter cover.
  • the intermediate block subdivides the interior of the case into two superimposed compartments, the upper one of which contains a first electrical sub-assembly sheet composed by the contacts, the relay and the trip mechanism and the contacts, and the other lower contains a second electrical sub-assembly, composed by the differential transformer crossed by conductors connecting the fixed contacts to the output terminals.
  • Said first and second sub-assemblies are pre-assembled outside the housing to group the electrical members of the different poles, then positioned and secured respectively on the opposite faces of the intermediate block.
  • said intermediate block comprises housings of connection terminals staggered along the two edges of the block parallel to the slide.
  • the integral terminals of the first sub-assembly are inserted from above into a series of housings, while the integral terminals of the second sub-assembly are inserted from below into the opposite housings.
  • the trigger mechanism is equipped with a contact position indicator actuated directly by the slide.
  • a low-voltage differential switch 10 is housed in a case 12 of molded insulating material formed by the superposition of a base 14, of a block Intermediate 16 supporting electric components and E- m-mechanical, and a cover 18 closing of the casing 12.
  • the invention is described with reference to a differential switch 10 connected in a four-pole three-phase system with neutral conductor (fig. 1 to 9), but it is obvious that it also applies to a bipolar differential switch used in a single-phase network with neutral (fig. 10 to 12).
  • the intermediate insulating block 16 comprises a transverse wall 20, extending parallel to the base of the base 14, and dividing the interior of the housing 10 into two compartments, the upper 22 directed towards the cover 18 for housing a switching chamber 24, a control mechanism 26 with an opening resaort and a polarized relay 28, the other lower 30, formed between the wall 20 and the base 14 for the arrangement of a toroidal differential transformer 32 for summing the currents flowing through the conductors of the switch 10.
  • the detection member of the differential tripping device consists of the toroidal transformer 32 whose measurement winding 34 is connected by conductors 36 to the control coil of the relay 28.
  • the movable pallet 36 of the latter cooperates with a locking lever 40 of a lock of the control mechanism 26 juxtaposed with a rotary handle 42 resettable movable between two extreme positions closing and opening.
  • a differential tripping device is usual and its operation can be summarized by signaling that an excitation of the relay 26 by the transformer 32 occurs during the appearance of a differential current in the conductors crossing the detection terminal, and causes pivoting of the locking lever 40 clockwise ( Figure 9b) causing the release of the mechanism 26 lock followed by the automatic release of the switch whose contacts open under the action of the spring d 'opening.
  • Rearmament of the lock is effected by pivoting the lever 42 of the m e - mechanism 26 to the closed position (fig 9a.) of the contacts.
  • a device for controlling and testing the operation of the differential protection by the transformer 32 is produced in a conventional manner by a branch circuit comprising in series a test resistor 44 and a salt switch (not shown) with test button 46. Pressing the test button 46 against its return spring causes the test switch to close, generating an artificial differential current detected by the transformer 32, which causes the switch to open. 10.
  • the test resistor 44 is housed in the lower compartment 30 inside a notch 48 formed in the intermediate block 16 (FIG. 3).
  • the test button 46 protrudes from the cover 18 through a square window located near a circular hole 50 for the introduction of the control handle 42. The latter comprises an operating pin 52 engaged in an orifice 54 of the mechanism 26 (fig. 1).
  • the differential trigger relay 28 and the associated control mechanism 26 are arranged in the upper compartment 24 on a common fixed plate 56 disposed on a cover 58 insulating shutter of the breaking chamber 24.
  • a switching bar 60 in the form of insulating slide is mounted in limited translation in the chamber 24 during a predetermined stroke between two extreme positions of closing and opening of the switch.
  • the displacement in translation of the bar 60 is effected by the intermediary of a transmission finger 62 of the mechanism 26 co-operating by interlocking with an actuating orifice 64 of the bar 60.
  • the transmission finger 62 is guided during the - said stroke in an oblong slot 66 of the mechanism 26, extending in the longitudinal direction of the sliding bar 60.
  • the switching bar 60 is equipped with four bridges of Contacts 68 of identical structures, spread to inter- v a ll are regular along the longitudinal direction in the housing 70 rectangular to the axis of rod 60.
  • the contact bridge 68 reotilinear of each pole extends perpendicular to the bar 60 and passes through the corresponding housing 70 while being held in place by a contact pressure spring 72, interposed between the middle part of the bridge 68 and the bottom of the housing 70
  • the interrupting chamber 24 is subdivided by intermediate partitions 74 (FIG. 4) into four juxtaposed spaces 76 staggered along the bar 60 and serving as housing for the contact bridges 68 of the different poles.
  • Each partition 74 perpendicular to the wall 20 is molded with the block 16 and has a central groove for housing the sliding bar 60.
  • each bridge 68 carries a contact pad constituting the movable contact 78 coming into engagement in the closed position of the switch with a fixed contact 80 secured to the corresponding partition 74.
  • the cut-off interval 82 formed between the separate contacts 80, 78 of each pole extends in the longitudinal direction along the same side of the bar 60 to the interior of the corresponding housing 70.
  • the other end of the bridge 68 electrically connected by a flexible connecting braid 86 to a pad 87 conducting a connection terminal 88 of the corresponding pole.
  • each terminal 88 is bent in a U, and mounted captive in a conductive cage provided with a fixing screw 90 resting on the base of the area 87 which simultaneously serves as a clamping plate for the electrical conductor held in the window of the terminal 88.
  • Each connection terminal 88 remains integral with the corresponding contact bridge 68, and is threaded by sliding into a housing 92 formed in the wall 20 of the intermediate block. 16.
  • Each fixed contact 80 is carried by a strip of not con- ction 94 which passes through the wall 20 and then extends trans- ve rsalement in the lower compartment 30.
  • the differential transformer the toroid 32 is traversed by primary conductive tors 96 connected respectively by their opposite ends to the bars 94 and to areas 97 of connection terminals 98 of the different poles.
  • Each terminal 98 of the cage type is inserted into a housing 100 of the intermediate block 16, and the corresponding pad 97 is shaped as a double square, the middle branch of which is arranged in the cage and serves as a clamping plate.
  • the housings 92, 100 of the current supply terminals 88, 98 extend along two opposite sides of the intermediate block 16 on either side of the switching rod 60.
  • the terminals 88, 98 of the same pole are aligned in a direction perpendicular to the bar 60 and parallel to the corresponding contact bridge 68.
  • the cover 18 of the housing 12 is provided with holes 102 for access to the terminal fixing screws 88, 98.
  • FIGS. 7a, 7b and 7c schematically show the operation of the switching bar 60 during its translational travel at a pole of the switch.
  • the contact bridge 68 is resiliently mounted in the housing 70 of the slide in the open position of the contacts 78, 80 (fig. 7a).
  • the heel of the bridge 68 opposite the contact 78 abuts in an intermediate position against a fixed shoulder 104 of the wall 74 of the insulating block 16 before the contacts 76, 80 are closed (fig. 7b).
  • the continued closing stroke of the consutation bar 60 then causes the contacts to close (fig. 7c) and a correct contact pressure by compression of the spring 72 associated with the bridge 68.
  • a reverse opening movement causes, during bonding of the contacts, a breakout by pivoting, the bridge 68 constituting a force multiplier lever.
  • the intermediate block 16 serves as a support for two pre-assembled sub-assemblies A and B grouping together the electrical members of the different poles.
  • the first sub-assembly A (fig. 1) is formed by the connection bars 94 of the fixed contacts 80, the differential transformer 32 associated with the primary conductors 96 and the connection terminals 98.
  • the second sub-assembly B (fig . 1 and 5) comprises the switching bar 60 fitted with bridges 68 connected to the terminals 88 by the flexible braids 86.
  • the two sub-assemblies A and B are respectively positioned on the lower and upper faces of the wall 20 of the block 16 after insertion of the sliding terminals 98, 88 in the appropriate housings 100, 92.
  • the breaking chamber 24 is then covered by the cover 56 provided with a light 106 for the passage of the transmission finger 62 during the mounting of the mechanism 26 and the relay 28.
  • the intermediate block 16 fully wired is then positioned by the underside of the wall 22 in guide grooves 108 of the base 14; the cover 18 covers the bodies of the upper compartment 22 by resting on the upper face of the wall 22 after fitting the lever 42 and the test button 46.
  • the final assembly of the housing 12 of the switch 10 takes place at by means of two fixing screws passing through aligned holes in the base 14, the intermediate block 16 and the cover 16.
  • the assembly of the block 16 on the base 14 is effected by means of two hollow rivets taking the place of fastening elements of the switch 10 when the latter is mounted on a panel.
  • the differential switch is equipped with a position indicator 110 of the contacts capable of occupying two distinct positions depending on the position of the switching torch 54, a first position resetting the control mechanism 26 (fig. 9a) corresponding to the closing of the contacts 78, 80 of the poles of the switch, and a second position for signaling the opening of the contacts 78, 80 (fig. 9b).
  • Position indicator 110 comprises a bent lever 112, articulated on a pivot 114 secured to the upper plate 116 of the mechanism 26 located opposite the cover 18.
  • One of the ends of the pivoting signaling lever 112 comprises a hole 118 oblong in which the finger engages transmission 62 of the control mechanism 26.
  • a reference mark 0 for signaling.
  • the upper 116 and lower 56 plates of the mechanism 26 are each provided with a notch 120 revealing a fixed mark I secured to the cover 58 of the intermediate block 16.
  • the mark I is located opposite a window 122 formed in the cover 18 made of opaque insulating material.
  • the opening of the contacts by manual action or on differential actuation causes the translation of the transmission finger 62 in the lumen 66 and the pivoting of the signaling lever 112 anticlockwise to the second active signaling position opening the switch.
  • the reference I is hidden by the reference 0, and the latter is visible through the window 122. The user is then certain that the contacts 78, f0 of the poles are open.
  • Figures 10 to 12 show the embodiment of a bipolar switch 130 from the four-pole version described above.
  • the same references designate parts that are identical or similar to those of FIGS. 1 to 9.
  • the standard four-pole switch 10 is used after removing two strips 94 for connecting fixed contacts 80, and two movable contacts 68 with the associated braids 86.
  • the corresponding terminals 88 and 98 are replaced by shutters 132.
  • a device for locking the actuating members (fig. 12 and 13), in particular of the lever 42 and of the test button 46, comprises a seal 134 which can be sealed, formed by a precut polycarbonate plate arranged on the cover 18. The lever 42 may thus be locked in the two engaged and released positions.
  • the four-pole 10 and two-pole switches 130 can be equipped with a remote tripping device.
  • this remote triggering device for the bipolar switch 130 will be described (see FIGS. 11 and 12). It comprises a connector 136 integrated into the intermediate block 16 and cooperating with a plug-in socket 138 for remote triggering.
  • the electrical connection of connector 136 is made by two connecting wires, one of which 140 is connected to one phase and the other of which 142 is connected to the other phase by means of a tertiary winding 144 of the transformer differential 32.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Keying Circuit Devices (AREA)
EP19810400035 1980-01-31 1981-01-13 Mehrpoliger Niederspannungsdifferentialschalter Expired EP0033671B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8002327A FR2475291A1 (fr) 1980-01-31 1980-01-31 Interrupteur differentiel multipolaire pour reseau a basse tension
FR8002327 1980-01-31

Publications (3)

Publication Number Publication Date
EP0033671A2 true EP0033671A2 (de) 1981-08-12
EP0033671A3 EP0033671A3 (en) 1981-08-26
EP0033671B1 EP0033671B1 (de) 1984-12-19

Family

ID=9238158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810400035 Expired EP0033671B1 (de) 1980-01-31 1981-01-13 Mehrpoliger Niederspannungsdifferentialschalter

Country Status (5)

Country Link
EP (1) EP0033671B1 (de)
DE (1) DE3167762D1 (de)
ES (1) ES498187A0 (de)
FR (1) FR2475291A1 (de)
YU (1) YU40245B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500209A1 (fr) * 1981-02-18 1982-08-20 Merlin Gerin Adaptateur a interrupteur differentiel
FR2581792A1 (fr) * 1985-05-31 1986-11-14 Gen Electric Disjoncteur bipolaire de protection contre les mises accidentelles a la masse
EP0530392A1 (de) * 1991-09-02 1993-03-10 Siemens Aktiengesellschaft Fehlerstromschutzschalter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2923939A1 (fr) * 2007-11-16 2009-05-22 Schneider Electric Ind Sas Appareil de coupure electrique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2282715A1 (fr) * 1974-08-21 1976-03-19 Condor Werk Frede Kg Geb Disjoncteur par courant de defaut
DE2706647A1 (de) * 1977-02-17 1978-08-24 Bbc Brown Boveri & Cie Fehlerstromschutzschalter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR224860A (de) * 1973-04-05

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2282715A1 (fr) * 1974-08-21 1976-03-19 Condor Werk Frede Kg Geb Disjoncteur par courant de defaut
DE2706647A1 (de) * 1977-02-17 1978-08-24 Bbc Brown Boveri & Cie Fehlerstromschutzschalter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500209A1 (fr) * 1981-02-18 1982-08-20 Merlin Gerin Adaptateur a interrupteur differentiel
FR2581792A1 (fr) * 1985-05-31 1986-11-14 Gen Electric Disjoncteur bipolaire de protection contre les mises accidentelles a la masse
EP0530392A1 (de) * 1991-09-02 1993-03-10 Siemens Aktiengesellschaft Fehlerstromschutzschalter

Also Published As

Publication number Publication date
ES8201357A1 (es) 1981-12-16
YU40245B (en) 1985-08-31
EP0033671B1 (de) 1984-12-19
EP0033671A3 (en) 1981-08-26
ES498187A0 (es) 1981-12-16
FR2475291A1 (fr) 1981-08-07
FR2475291B1 (de) 1982-09-03
DE3167762D1 (en) 1985-01-31
YU21381A (en) 1983-06-30

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