FR2734080A1 - ELECTRICAL INSTALLATION SWITCH DEVICE - Google Patents

Abstract

Electrical installation switch device comprising two systems of juxtaposed extinguishing chambers, separated from one another, each having a contact whose movable contact parts are respectively arranged on a contact arm fixed on a support. The two extinguishing chambers (20, 29) are offset one behind the other in the direction of arc displacement (L) and on the first fixed contact piece (15) of the anterior chamber (20) in direction of displacement of the arc, there is provided an extension (30) projecting forward of the first contact (13, 15) in the direction of displacement of the arc.

Description

ELECTRICAL INSTALLATION SWITCH DEVICE

  The invention relates to an electrical switch installation apparatus comprising two juxtaposed extinguishing chamber systems, separated from each other, each comprising a contact whose moving contact pieces are arranged on a fixed contact arm. on a support. Electrical installation apparatus, in particular line protection circuit breakers, having a two-chamber extinguishing system, are known per se. In the case of motor protection circuit-breakers, arc extinguishing chambers are frequently offset by 180, which implies two fixed contact pieces spaced apart from one another and which can be interconnected. by a contact bridge. The arc extinguishing plate systems are then located, with the contacts, in a plane defined by the contacts and the direction of movement of the contact pieces. The electric arcs that occur during a

  switching away from each other.

  There is also known an electrical installation apparatus with a two-chamber quenching system, in which the contacts as well as the arc extinguishing laminations are arranged side by side; the movable contact pieces are respectively fixed on a contact arm, the two arms being respectively disposed on a common support, so that the two moving contact pieces move simultaneously in the opening direction when the support pivots towards the position of opening under the action of a lock of

  switching or electromagnetic shielding system.

  The two electric arcs then have the same direction of

displacement.

  It has been found that the arcs of two arc paths electrically connected in series in two juxtaposed extinguishing chamber systems exert, in the case of high intensity short-circuit currents, unfavorable reciprocal influences under one another. effect of the electromagnetic fields generated in this case. In the first place, this can only be essentially avoided by having the extinguishing chamber systems remote from each other.

  the other, which implies a large amount of space.

  The object of the present invention is to provide an electrical switch installation device of the type defined above with an inexpensive, space-saving arc extinguishing system for short-circuit currents.

  high and high nominal intensities.

  According to the invention, the two extinguishing chambers are offset with respect to one another in the direction of movement of the arcs and on the first fixed contact piece of the anterior quenching chamber in the direction of movement of the arcs. the arc is disposed an extension projecting beyond the first contact in

  opposition to the direction of arc displacement.

  Thus, one of the two arc paths is first preferred and an electromagnetic field accelerating the arc is established at the back of this arc. In the direction of movement of the arc or arcs, two arc columns located or moving one behind the other are produced. The extinguishing plate packets offset in the direction of movement of the arc allow a large distance between the two arc columns in the chambers,

  so that their mutual influence is minimized.

  The sidewalls of the prechambers are constituted by a material releasing gas, which has an influence

  favorable on the arc extinction operation.

  According to another embodiment of the invention, the two arc extinction chambers are separated from each other by means of a partition; the partition itself is made of insulating material. An insert or plate or steel layer incorporated in this partition is used to

  magnetic shielding between the two contact areas.

  In the case of a switch device comprising a first arc guide plate on which is fixed the first fixed contact piece, it is the first sheet metal

  arc guide which has said extension.

  The extension may advantageously be L-shaped and cover the first contact substantially in the direction of movement of the first movable contact piece. Referring to the accompanying drawings which show an exemplary embodiment of the invention, the invention will be described in more detail along with features, improvements and other advantages of the invention; in the drawings: Figure 1 is a side view of an arrangement of extinguishing chambers according to the invention in the closed position; Figure 2 is a sectional view of the extinguishing chamber arrangement II-II of Figure 1; and FIG. 3 shows the arrangement of side view extinction chambers according to FIG.

cutoff position.

  We will now refer to Figure 2.

  Inside a housing 10 of the monocoque type are two juxtaposed contacts 11 and 12 each having a movable contact piece 13 and 14 and a fixed contact piece 15 and 16. The lines of the references 15 and 16 are oriented in the direction in which you are

fixed contact parts.

  The fixed contact parts 15 and 16 are respectively disposed on an upper arc guide plate 17a and 17b. The upper guide plate 17a of the contact 11 is shown in thick solid line in FIG. 1 and the two guide plates 17a, 17b are shown in dashed lines in FIG. 2. The guide plate has a narrow zone in the zone of the contact. 18a, 18b and, in the direction of movement of the arc, a zone 19a, 19b wide connecting thereto. The wide zone 19a, 19b respectively covers a bundle of arc extinguishing plates 20 and 29, these bundles of plates defining two extinguishing chambers composed in a manner known per se by arc extinguishing plates 21

  stacked (Figure 2) with a cutout 21a.

  The movable contact piece 13 is fixed, like the movable contact piece 14, on a contact arm 22, 23, the two contact arms 22, 23 being interconnected by means of a spacer 24, forming a fork U-shaped, the spacer being attached to a support (not shown) which is pivotable about an axis (not shown either), so that the contact lever arrangement 22, 23, 24 can be brought from a closing position according to FIG. 1 at a cut-off position according to FIG. 3, in which the horn 25, 26 connecting to the movable contact piece 13, 14 bears against a lower arc guiding plate 27 or 28 resembling, as to their shape projected on the drawing plane, to the arc guide plates

17a, 17b.

  The lower arc guiding plates 27, 28 are bent roughly at Z and have, in the area in front of the contacts 11, 12, a smaller distance compared to the arc guide plates 17a, 17b than in the

  zone of arc extinguishing plate packets 20, 29.

  As shown in FIG. 2, the contacts 1111 and 12 are placed side by side, the contact arms 22 and 23 being of the same length; the arc extinguishing plate packets 20, 29 are staggered, that is, in the direction of arc displacement L. The arc extinguishing plate package 20 located to the right in the direction of arc displacement is before the.package of

arc extinguishing plates 29.

  The upper arc guiding plate 17a has, in opposition to the direction of arc displacement beyond contact 11, a connecting lug 30 which is oriented vertically towards the other lower arc guiding plate 27 and to which is connected an end of

coil 31.

  On either side of the arc chamber, hence on each side of each contact and the prechamber space 32 of each contact 11, 12, there is provided a prechamber plate 33 and 34 with a clearance of gas; between them is a partition 35 in which a metal sheet 36 of steel is provided as a screen between the contacts. Another partition 37 is between the arc extinguishing plate packs 20, 29 of the two. bedrooms

extinction.

Claims (4)

  1. Installation electrical switch device comprising two systems of extinguishing chambers juxtaposed, separated from each other, each having a contact, the movable contact parts are arranged respectively on a contact arm fixed on a support , characterized in that the two extinguishing chambers (extinguishing plate packs 20, 29) are shifted one behind the other in the arc-moving direction and on the stationary contact piece (15). ) of the chamber (extinguishing plate pack 20) which is the first (forward) in the direction of travel of the arc, there is provided an extension (30) projecting beyond the contact (11)   in opposition to the direction of arc displacement.   2. Switching device according to claim 1, comprising a first arc guide plate (17a) on which is fixed the first fixed contact piece (15), characterized in that the first guide plate   arc (17a) has said extension (30).   3. Switching device according to Claim 2, characterized in that the extension (30) is L-shaped and covers the first contact (11; 13, 15) substantially in the direction of movement of the   first movable contact piece (13).   4. Switching device according to any one   of the preceding claims, characterized in that   the two arc extinguishing chambers are separated from each other by a partition (35, 37) to which is incorporated a steel layer (36).