SU1003165A1 - Lamellar contact - Google Patents

Description

(54) LAMEL CONTACT

This invention relates to electrical shading.

Lamella contacts for high-voltage disconnected pins are known, - a current-carrying knife with spring-loaded lamellas located on it and contact jj entering into the lamellae with keys with the character of contact of the contact surface of a cylinder-plane 13

In such contacts, with deviations from the plane and the straightness of the surfaces within the tolerances, the lamella with one contact blade has electrical contact at two points, and with the other - only at one point.

Thus, with the passage of short-circuit currents, the current transition with one contact point is overloaded, as a result of which the contacting of elements can melt and weld. To prevent this, usually increase the contact pressure by means of springs, which increases the load on the drive,

or increases the number of contact points, i.e. install additional lamellae, which leads to increased consumption of non-ferrous metal.

The purpose of the invention is to increase the thermal resistance of the contact at short-circuit currents.

Claims (1)

The goal is achieved by the fact that in the lamellar contact of electrical devices, for example, disconnectors, containing a knife with spring-loaded lamels fixed on it and a contact knife, which is included in the place of electrical contact of the knife with 5 fixed on it lamella has a recess, and the other has a bulge, while the recess or convexity has the shape of a part of the body of rotation, and the convexity enters the recess, resting on its edges at two or three points, in the place of electrical contact of the same lamella a knife movable contact lamella has two protuberances disposed symmetrically to its longitudinal axis. Fig. 1 shows a lamellar contact; in fig. 2 is a section A-A in FIG. 1 in FIG. 3 - section BB in the fng. one; in fig. 4-6 - variants of the lamellae to the foot of the contact, L1flash contact consists of contact blades 1 and 2, one of which is fixed to the lamella 3 by a bolt 4 and axis 5. The contact pressure is spring 6. The lamellae 3 have a spherical shape at one end on the other, resting on the chamfer of the cylindrical opening of the contact knife 2, and on the other two extensions resting on the flat contact surface of the knife 1 In this design of the contact, the lamella 3 rotated under the action of springs on the spherical surface and cme in this place at least two konta KT points, is established by the other end, too, PA two points (along the protrusions) on but one, i.e. self-acting. Thus, the memory contact has two guaranteed contact points in each current transition (from the contact knife to the lamella and from the lamella to the jacket J o Iy to the knife). Other equivalent versions of the lamella contact are the examples shown in FIG. 2-4 and differing in the shapes of the sleeves and recesses, which are in the place of the contact of the knife with the lamella fixed on it. FIG. Figure 2 shows a lamella contact, in which a contact knife 2 with fixed first lamellae of spherical waves, and a lamella with a cylindrical hole with a chamfer, the bulge enters the knife hole and rests on its chamfer. FIG. 3 shows a lamella contour in which a contact knife 2 with lamellas fixed on it is made with a cylindrical recess, and a lamella 3 with a spherical bulge that enters the recess of the knife and rests on its edge. FIG. 4 shows a lamella contact, in which a contact knife 2, with lamellas fixed on it, is LIPOLATED with a recess formed by two conical protuberances, and a lamella 3 with a cylindrical bulge that goes into the recess of the knife and rests on its edge. The lamella contact is similar to the variant shown in FIG. 1, Increasing the number of contact points during the passage of short circuit currents reduces the contact pressure. This can be seen from the relation: nkce / ®® - current value; coefficient depending on the materials of the contact surfaces; P - the number of contact points. If the number of contact points in one pair of lamellae from two fi four is increased, the spring pressure can be reduced by. At the same time, the load on the drive is reduced by 30%. Claims of lamella contact of electrical apparatuses, for example, disconnectors, comprising a knife with spring-loaded lamellae and paired lamellae and a contact blade entering the lamella when switched on, which is designed to increase the thermal resistance of the contact at short-circuit currents electrical contact of the knife with a fixed lamella, one of these elements is made with a recess, and the other with a convexity, while the recess or bulge has the shape of a part of the body of rotation, and the bulge enters into ublenie leaning Referring at its edges in two or three points, in place of this electrical contact with the movable contact lamella knife lamellae vtolnena m with two protuberances disposed symmetrically relative to its longitudinal axis. Sources of information taken into account in the examination 1. Afanasyev V. V., Yakunin E. N. Disconnectors. L., Energie, 1972, p. 125-133. %% VVvl ff r-r rxy / xxi ±  X / Y77 / ////// У1 jvv / x / vy: i } ///// 0e / f.f 4-L U 0e / e.ff