SU1410128A1 - Vacuum arc-extinguishing chamber - Google Patents

Abstract

The invention relates to the field of electrical engineering, in particular to switching devices. The purpose of the invention is to increase the electrical resource, increase reliability, reduce the material consumption of the camera. This is achieved through the use of a contact system, consisting of a pair of relatively movable, mounted on the rods and creating, their axial magnetic field of the contacts, at least one of which is surrounded by an arc of the device. Parallel contact planes and unidirectional currents flowing along the periphery of the closed contacts reduce the force of their electrodynamic repulsion. The arc at the moment of its occurrence when the contacts open is under the action of an axial magnetic field, which causes its propagation along the surface of the contacts, reduces their erosion, and increases the electrical channel in comparison with the prototype. With a current of more than 1 kA, the arc occurs not only between the contacts, but also on the arc, a device that is a series of concentric, cut, electrically isolated from one another and FROM the contact of metal rings electrically connected to the rod, which is conditionally left, then right end. As a result, the direction of the currents flowing along the periphery of the contacts and in the adjacent rings of the arc of the device is mutually opposite. Mutually opposed and formed or axial magnetic fields. The presence of several vacuum arcs shielded from one another by axial magnetic fields leads to a more uniform thermal load on the contacts and the arcing device, prevents arc contraction, reduces the material consumption of the chamber and increases the reliability of operation. 4 hp ff, 8 ill. S (l

Description

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contacts and arc-suppressing devices are made of metals or alloys with electrical conductivity close to that of copper (elements that provide mechanical strength of contacts and arc-suppressing devices are not shown).

The camera works as follows.

When contacts 5 and 6 are closed, parallel unidirectional currents flow through their peripheral parts. As a result, the Invention relates to electrical engineering, specifically to vacuum arcing chambers of high voltage.

The purpose of the invention is to increase resource availability, increase reliability, and reduce material consumption.

. FIG. 1 shows a camera, a common ID: FIG. 2 - contacts and arc-suppressing device, cut; in fig. 3 shows section A-A in FIG. 2; in fig. 4 is a view B in FIG. 3; in fig. 5 - contact section and 10 those of which both contacts are covered by a magnetic arcing system, installed by a nan field, which causes their mutual

conductive base; in fig. 6 - compression. Compressive strength is proportional to the square of the current flowing through the chamber, opposite to the force of electrodynamic pushing apart of contacts and commensurate with it. This causes, in comparison with the prototype, a significant decrease in the resultant force pushing apart the contacts and, consequently, the pressing force that the drive should develop. As a result drive

No. 4 and a pair of relatively mobile 20s can be made lighter and more flexible. contacts 5 and 6, containing at the periphery. When the contacts between them open, an arc occurs (Fig. 2, D |). In the contact gap, it continues to operate predominantly in the axial bellows 9, for protection of which the magnetic field from induction of the arc and condensation by the metal B | L:; 0.01 T / kA, which contributes to

the centering of the arc on the surface of the contacts, reducing their wear and increasing the electrical resource in comparison with the prototype. When the current is disconnected, the arc initially exists at the top of FIG. five; in fig. 7 — installation of a contact and an arc-suppressing device on the base with a flange; in fig. 8 - the same, top view.

The chamber contains a cylindrical insulating body 1, which is closed at the ends with metal flanges 2 and 3, with one or multiple running identical forked spirals arranged in a coaxially insulated part screen. The contacts are fixed to rods x 7 and 8. The relative mobility of the contacts is provided

which pair serves as screen 10. At least one of the contacts (figs. 2-4 both contacts) is surrounded by an arcing device consisting of one or several, for example two, concentric cut metal rings 11, 12 and 13 and 14, the slots of which 15 and 16 are oriented mainly in the axial direction. With oblique cuts, the latter in the adjacent rings of the same arc suppressor device are inclined in opposite directions (Figs. 3 and 4). One end of each ring is electrically connected to the rod or flange. When connected to a rod, it can be used between contacts 5 and 6. When the current increases, an arc (D2) first appears between the rings 11 and 13, and then an arc (Dz) between the rings 12 and 14, etc. (Fig. 2). The occurrence and maintenance of arcs between the rings is determined by the positive current-voltage characteristics of the arcs at currents greater than 1 kA. Rings 11-14 are connected to rods or current-carrying

the bases alternately conditionally left.

; plates 17 and 18 are connected (fig. 2, 4). Possibly the right ends or vice versa. As a result, it is possible to use the direction of currents common to all the catholes that flow along the peripheral part of the contacts 5, 6 and in the rings when they occur between the last arcs (D2 and Dz) alternate (Fig. 3). These currents form in the gap between the rings of the axi: lec and the contact of the conductive base 19 (Fig. 5). In some cases, it is advisable to electrically connect the rings with the rod through conductive cylindrical base 20 and flange 21 (Fig. 7). Rings magnetic field with alternating.

contacts and arc-suppressing devices are made of metals or alloys with electrical conductivity close to that of copper (elements that provide mechanical strength of contacts and arc-suppressing devices are not shown).

The camera works as follows.

When contacts 5 and 6 are closed, parallel unidirectional currents flow through their peripheral parts, as a result of which both contacts are covered by a magnetic field, which causes their mutual

There is an arc (D2) between rings 11 and 13, and then an arc (Dz) between rings 12 and 14, and so on (Fig. 2). The occurrence and maintenance of arcs between the rings is determined by the positive current-voltage characteristics of the arcs at currents greater than 1 kA. Rings 11-14 are connected to rods or current-carrying

the rod or the conductive base is electrically connected alternately with either the conditionally left, then the right end, or vice versa (Fig. 6, 8 shaded areas). The side of the rings facing the opposite contact does not reach the plane of contact of the contacts, therefore there remains some distance between the rings of the opposite arc-suppressing systems. Insofar as

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by changing the direction of the induction vector (Fig. 2, the vectors Bi, Bi2, Bi2, Bz). This field has a powerful — on the order of 0.01 T per kilo-amp current flowing through the ring — an axial component. The presence of several vacuum arcs isolated from one another by the axial magnetic field leads to a more uniform thermal load on the contacts and arc-suppressing devices, preventing the arc from being compressed. As a result, the rims do not flow around the long-flowing 55 with the possibility of decreasing in comparison with the current through the chamber and, therefore, the prototype of the diameter of the contact system and

an isolated screen, as a result of which the specific material consumption of the chamber is reduced.

they are not heated, their cross section can be significantly reduced. Listed items

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by changing the direction of the induction vector (Fig. 2, the vectors Bi, Bi2, Bi2, Bz). This field has a powerful — on the order of 0.01 T per kilo-amp current flowing through the ring — an axial component. The presence of several vacuum arcs isolated from one another by the axial magnetic field leads to a more uniform thermal load on the contacts and arc-suppressing devices, preventing the arc from being compressed. As a result, the formula of the invention

Claims (4)

1. A vacuum arc chamber containing an insulating cylindrical body, flanges closed at the ends, with a coaxially insulated shield and contact system consisting of a pair of relatively movable contacts attached to the rods and with at least one of the Single or multiple spirals are made. 3. The camera on the PP. 1 and 2, characterized in that said concentric cut metal rings are electrically connected to the rod alternately with either conditionally left or conventionally right ends. 4. The camera on the PP. 1-3, characterized in that the concentric cut metal arcing device, characterized by - 10 face rings with a rod electrically so that, in order to increase the resource, they are connected through an additionally introduced sa, increasing reliability and reducing the common conductive base . material intensity, arc suppression device made in the form of at least one5. Camera on the PP. I-4, looking at the one that is concentrically cut metal- that concentric cut metal rings, electrically connected by one ring with a rod electrically with the end of the indicated rod. . connected through the additionally introduced 2. Chamber according to claim 1, characterized in that a flange connected to said base on one of the contacts at its periphery. Single or multiple spirals are made. 3. The camera on the PP. 1 and 2, characterized in that said concentric cut metal rings are electrically connected to the rod alternately with either conditionally left or conventionally right ends. X / (rig. A 6 i f (Ug. T . v: xj /. V v; V / f / 7 / .f Si / d5 r /. 18 sixteen / // // / / 7 Srig. Z G /////// / nineteen FIG. five 21 .6 .-, //. / l Phi2l