Dual-power automatic change-over switch

Abstract

The invention discloses a dual-power automatic change-over switch, belongs to the field of electrical equipment, and in particular relates to the dual-power automatic change-over switch, comprising an automatic operating mechanism provided with a sampling unit, a control unit and an electromagnet, and a contact chamber provided with wiring terminals that comprise two power supply wiring terminals and a load wiring terminal, wherein each wiring terminal is provided with a linking post, the linking post is partly embedded into the wiring terminal and in interference fit with the wiring terminal, the linking post is provided with a first conductive columnar part in interference fit with a power bus, a second conductive columnar part is coaxially arranged in the first columnar part, the first and second columnar parts are in interference fit with each other, and the thermal expansion coefficient of the second columnar part is more than that of the first columnar part. The switch disclosed by the invention has the advantages that 1, the more conductive areas are generated with the same splicing length, and thus the current density is reduced, and the lower temperature rise of the wiring terminal is achieved; 2, the consumption of the buses is reduced, and the resources are saved; and 3, the electric clearance or safe distance is increased, and the electrical security of the equipment is improved.

Description

technical field [0001] The invention relates to the field of electric equipment, in particular to a double power supply automatic transfer switch. Background technique [0002] In the existing power complete equipment factory, the construction workers install the dual power automatic transfer switch in the power distribution cabinet. The terminals of the dual power automatic transfer switch are usually directly connected with the power busbar, and the power busbar is directly connected to the terminal. The connecting terminal and the power busbar are usually overlapped and lapped, and then fastened with bolts. Such as image 3 and Figure 4 As shown, this connection method needs to overlap the busbar and the terminal 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 usuall...

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 terminal and the non-conductive The large spacing will inevitably cause the overall size of the entire dual power automatic transfer switch to become larger

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