Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H50/00—Details of electromagnetic relays
  • H01H50/54—Contact arrangements
  • H01H50/541—Auxiliary contact devices
  • H01H50/543—Auxiliary switch inserting resistor during closure of contactor
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H50/00—Details of electromagnetic relays
  • H01H50/54—Contact arrangements
  • H01H50/541—Auxiliary contact devices
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
  • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member

Definitions

• the present invention relates to a switching device comprising at least one main switch able to change state at the end of a transient opening phase or a transient closing phase, under the effect of a member. control, and at least one secondary switch with monostable operation, designed so as to change state, fleetingly during one of the two aforementioned transient phases.
• Respect for the above-mentioned operating sequence is generally obtained by using a control part which is connected to the armature of the electromagnet and simultaneously actuates the moving parts of these switches. Thanks to separate spacings separating the movable contact parts of the two sets of switches and the corresponding fixed contact parts, the same movement first establishes the closing of the auxiliary switches and then that of the main switches which do not undergo as well as the establishment of reduced currents and, then, a constant intensity corresponding to the established regime.
• the main switches open first and, as the auxiliary switches are still closed, withstanding an almost negligible cut.
• the auxiliary switches support most of the shutdown and, being less well sized for this function, alter the life of the device.
• the invention aims to provide a switching device operating as described above on closing, but reversing the switching sequence of the contact parts of the main and auxiliary switches during opening. , in order to ensure with certainty the transfer of the current flow from the auxiliary switches to the main switches.
• the invention provides a switching device comprising at least one main interrupter which can pass from an open position to a closed position during a transient closing phase and from a closed position to a open position during a transient opening phase, these two phases being controlled by respective movements of a control member, and at least one auxiliary switch comprising at least one fixed contact and one movable contact connected to said control member through a mechanical connection.
• this device is characterized in that said mechanical connection comprises a disengageable coupling designed so as to pass from a coupled position to a uncoupled position, during one of said transient phases and then to return from said position uncoupled to the coupled position, during a subsequent passage of the main switch through the other transient phase.
• the aforesaid disengageable coupling is of the stress-breaking type and is designed so as to obtain a disengagement when the control force transmitted to the auxiliary switch by the control member of the main switch, exceeds a predetermined threshold.
• the above disengageable coupling consists of elastic snap-fastening means.
• the disengageable coupling uses at least two parts magnetically coupled to one another. other.
• the auxiliary switch and the return spring which is associated with it are arranged in a housing independent of the body of a contactor device. comprising the main switch, an armature return spring, as well as the electromagnet to which the actuation function of the two types of switches will be assigned.
• FIG. 1 an electrical diagram of a cooked circuit for connecting a capacitive load to a three-phase network, using a device according to
• FIG. 3 a first embodiment of a removable mechanical coupling connecting two contact carriers arranged in the extension of one another;
• FIG. 4 a state of the switching apparatus corresponding to a phase of operation where the main switches are closed, while the auxiliary switches are open;
• a circuit 1 for connecting a capacitive load 2 formed by three capacitors - Cl, C2, C3 - to a three-phase network - R, S, T - is shown in Figure 1.
• a type of remote-controlled device shown in this figure by way of example to operate this connection uses, on the one hand, an electromagnetic contactor device 3 having in a housing 26 an electromagnet 4, a movable armature 5 , a return spring 5 'which tends to place the latter in a rest position, and an operating member 6 which can advantageously be constituted by an insulating rake or contact carrier on which are movable parts of a set of main three-pole switches 7, 8, 9; on the other hand, a housing 11, which is mechanically associated with the housing 26, comprises a set of auxiliary switches 13, 14, 15 which is actuated by a second operating member 12 which can also be produced in the form of a rake or insulating contact carrier, and being subjected to the action of a clean return spring 12 'whose effects tend to open these switches.
• the two operating members which are advantageously here but not necessarily arranged in alignment, are coupled to one another using a releasable coupling 20 the operation of which will be specified below.
• auxiliary switches 13, 14, 15 are placed in series with respective limiting resistors - RI, R2, R3 - each of these series assemblies being placed in parallel on a corresponding main switch 9, 8, 7.
• Each resistor RI can be split into two series resistors Rla, Rlb placed on either side of the corresponding auxiliary switch 13; the resistances which are here placed outside the third boxes 26, 11 are advantageously connected to the external terminals of the switches using their connection conductors so that good heat dissipation takes place and the manufacturer is not required to modify the conventional boxes available to receive the contactor and the auxiliary contact block, see FIG. 1.
• This closing which is carried out a few milliseconds before that of the main switches and which only authorizes the passage of reduced initial currents through the three resistors, is obtained thanks to a difference in the closing distances specific to the contact parts of the main switches - e2 - and auxiliaries - el -, the latter being more reduced.
• a first type of removable coupling 20, visible in FIG. 3 in the coupled state when the complete apparatus is at rest, uses simple mechanical means that can be molded or overmolded during manufacture, or which can at otherwise be the subject of a combination of appropriate spare parts.
• An extension 16 of the contact carrier 6 which passes through an opening 27 of the housing 26 of the contactor and is projecting relative to a face (for example a front face or a side face) 30 thereof, has a clearance 28 of which the opposite edges 24, 24 ′ are narrower at the entry than the transverse dimension of a housing 29 which follows it.
• the contact carrier 12 of the auxiliary contact box 11 has for its part a fork-shaped extension 19 with elastic branches 17, 18 whose ends 17 ', 18' of the elastic branches 17, 18 are wider than the portion which precedes.
• the elasticity of this fork allows it to be released from the housing when a sufficient longitudinal traction is exerted between the two carriers. contacts, and allows it to engage therein when a longitudinal thrust is exerted by the contact carrier 6 towards the contact carrier 12.
• the means which have just been described give their full effectiveness only if the shape of the attraction curve of the electromagnet has been judiciously chosen so that the decelerations caused, on the one hand, by the expenditure of the energy required to disengage the coupling 20 and, on the other hand, by the compression of the spring 12 'are not too great.
• the energy developed by the relaxation of the return spring 5 ′ of the armature must be sufficient for the penetration of the fork into the housing to be ensured regardless of the orientation taken by the apparatus in 1 'space.
• the two contact carriers 38, 39 are associated by making use of the adhesion of magnetized 37 and magnetizable parts 36, for example using a ferrite and soft iron.
• the magnetizable part and the permanent magnet may be placed on one or the other of the contact carriers.

Landscapes

• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Mechanisms For Operating Contacts (AREA)
• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
• Switch Cases, Indication, And Locking (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9400704

Family Applications (1)

Country Status (11)

Cited By (1)

Families Citing this family (13)

Family Cites Families (7)

• 1990
  • 1990-09-27 FR FR9011920A patent/FR2667439B1/fr not_active Expired - Lifetime
• 1991
  • 1991-09-26 WO PCT/FR1991/000748 patent/WO1992006483A1/fr active IP Right Grant
  • 1991-09-26 JP JP3516107A patent/JP2977279B2/ja not_active Expired - Lifetime
  • 1991-09-26 AU AU85479/91A patent/AU652383B2/en not_active Ceased
  • 1991-09-26 EP EP91917148A patent/EP0503033B1/de not_active Expired - Lifetime
  • 1991-09-26 RU SU915052433A patent/RU2070747C1/ru active
  • 1991-09-26 US US07/859,308 patent/US5323132A/en not_active Expired - Fee Related
  • 1991-09-26 CA CA002069617A patent/CA2069617C/fr not_active Expired - Fee Related
  • 1991-09-26 DE DE69108893T patent/DE69108893T2/de not_active Expired - Fee Related
  • 1991-09-26 BR BR919105909A patent/BR9105909A/pt not_active IP Right Cessation
  • 1991-09-27 MX MX9101317A patent/MX9101317A/es not_active IP Right Cessation

Non-Patent Citations (1)

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