One-piece static contact for power switch

Abstract

The invention discloses an integral fixed contact for a power switch, belongs to the field of power equipment and particularly relates to an integral fixed contact for a power switch. The integral fixed contact for the power switch comprises a contact end and a connecting end, wherein the contact end is matched with a moving contact; the connecting end is matched with a power busbar; the contact end and the connecting end are continuous and integral; a connecting post is arranged at the connecting end, is partially embedded into the connecting end and is in interference fit with the connecting end; a conducting first columnar part which is in interference fit with the power busbar is arranged on the connecting post; a second columnar part with conductivity is coaxially arranged in the first columnar part; the first columnar part and the second columnar part are in interference fit; and the thermal expansion coefficient of the second columnar part is greater than that of the first columnar part. The integral fixed contact for the power switch has the beneficial effects that (1) relatively much conductive area is generated by the same overlapping length, so that the current density is reduced and a low temperature rise of the connecting end is achieved; (2) the dosage of the busbar is reduced and resources are saved; and (3) the electrical clearance or the safety distance is increased, so that the electrical safety of the equipment is improved.

Description

technical field [0001] The invention relates to the field of power equipment, in particular to an integrated static contact for a power switch. Background technique [0002] The connection end of the existing power switch is usually directly connected with the power busbar, and the power busbar is directly lapped on the connection end. Such as Figure 3-4 or Figure 11-12 As shown, this connection method needs to overlap the busbar and the connection end by a certain length, so that the current density of the contact surface can be maintained within a certain range, so that the temperature rise at the connection can meet the relevant standards. In order to reduce the temperature rise at the joint, it is usually necessary to increase the overlapping length of the busbar and the terminal to increase the contact area, thereby reducing the current density at the contact surface, and finally making the joint have a lower temperature rise. Increasing the overlapping length will ...

AI Technical Summary

Problems solved by technology

And increasing the overlap length will increase the amount of busbars, thereby increasing the manufacturing cost

Fastening bolts will reduce the electrical clearance or safety distance between conductive parts and non-conductive parts. In order to keep the electrical clearance or safety distance unchanged, it is necessary to increase the distance between the connecting end and the non-conductive Large spacing will inevitably lead to larger dimensions of the integrated static contact used for the entire power switch

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