JPS5864722A - Contact unit for vacuum breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises two tab-shaped contacts disposed coaxially and facing each other, and a contact support with slots and tabs of these contacts supports a closed ring-shaped contact, and this contact The front surface of the vacuum interrupter forms a contact surface, and the contact part k of the vacuum interrupter has oblique chamfers on the inner and outer radial edges, respectively.

The coaxially arranged collar-shaped contacts each form a rotating body, the bottom of which is connected to the conductor and the edge of the collar forming a ring-shaped contact surface. The contact carrier of the solid contact is provided with oblique slits extending in opposite directions, the slits dividing the contact carrier into segments.

These segments, together with the 7-voltaic current generated after the contacts open, form a current loop of the form #:L, whose Lorentz force causes an arc to rotate between the contacts.

This kind of true 9. In the contact portion of the L-interrupter, the edge of the contact is provided with a collar-shaped outward protrusion, and the outer edge KM of the surface of the protrusion is rounded to the mating contact. The flat part on the front side of this collar contact forms the contact surface, and the beveled edge at 16 is the point where the arc is driven outward by the radial component of the output. A burnt area is formed. The pot-like contact may also include a collar-like inward projection;
The diagonal chamfer is used as a Vc burnout area once the arc foot point is driven inward from the contact surface.

And the edge of the pot-shaped contact? Contacts are also known in which a closed ring-shaped contact made of a so-called contact material is provided, which contact is provided with radially inwardly and outwardly directed oblique threads.

The central plane of the ring-shaped contact forms a contact surface.

When an arc occurs after the contacts open, this arc is stabilized by the magnetic force between the contact surfaces of the contacts arranged oppositely on the N-axis.

For example, in the case of a high voltage of 36 kV or more, a large current of 50 kV or more, and a relatively long arc time, the arc foot point will reach the outer cylindrical surface of the contact support with a weight of 1%. It has been known. There, especially on the anode side, relatively unreasonable burnout of the carrier material, which generally consists primarily of steel, can occur. Although copper vapor diffuses relatively quickly and without stagnation, restriking cannot be completely avoided. Additionally, the pins may be driven radially inward and their feet may attach to the inner surface of the contact support, causing severe burnout of the support material there.

The object of the present invention is to stabilize a 7-point foot point in front of ring-shaped contacts arranged opposite to each other, and to prevent the 7-point foot point from moving by its neck toward a contact support.

This object is achieved in the contact area of such a vacuum interrupter according to the invention in that the ring-shaped contact has a radially inwardly and outwardly directed boxwood projection. Since this projection projects beyond the end face of the contact carrier, the arc foot must wrap around beyond the inner or outer edge of the contact in order to attach to the contact carrier.

However, when the foot point approaches the edge of the ring-shaped contact, a magnetic component acts in the radial direction that prevents movement of the foot point beyond the edge of the ring-shaped contact. The arc is therefore stabilized near the contact surface of the II song contact.

Next, based on this invention, the present invention will be explained in detail with reference to drawings showing one embodiment of the contact portion.

In the illustrated embodiment, the pot-shaped contact, preferably flat, is provided with a contact support 2, the end face of which is provided with a closed ring-shaped contact 4, and the bottom face 7 of which is connected with a conductor 8. There is. A pickpocket (not shown) on the contact support 2,
It is towed to set up a tow.

This slit exerts a tilting force on at least a portion of the bottom surface 7 with respect to the rotation of the contactor. Contact support 2
and conductor 8 generally consist of power control 1.

The ring-shaped contact 4 is made of a so-called contact material that has high burnout resistance, heat resistance, and mechanical strength. The force-force properties are provided by sintered impregnated materials containing, for example, chromium and copper. The ring-shaped contact 4 has radially inwardly and outwardly directed collar-like protrusions 5 and 6, respectively, and thus has a width that is flexible with the contact support 2 in a plane perpendicular to the axis of rotation of the contact. b = widened so that the contacts protrude radially inwardly and outwardly from the contact support. After the contacts placed opposite each other on the same axis open 1111,
The arc generated between the island contacts is prevented from moving to the outer wall, inner wall, or inner bottom surface of the contact support 2.

[Brief explanation of drawings]

The drawing shows a cross-sectional view of one embodiment of a contactor of a vacuum interrupter according to the invention. In the drawings, 2 is a contact support, 4 is a hinge-shaped contact,
The rod 6 is a protrusion.

Claims (1)

[Claims] 1) Two flange-shaped contacts are arranged facing each other on the same axis, and a contact support with a groove and a groove of these contacts supports a closed ring-shaped contact, and the front surface of this contact forms a contact surface. 411 that the ring-shaped contact has radially inwardly and outwardly directed brim-like protrusions at the contact portion of the vacuum interrupter having oblique dispersions on the inner and outer edges thereof in the radial direction; Image the contact part of the vacuum interrupter.