Design method of isolating switch with disconnection state of contact visible

Abstract

The invention discloses a design method of an isolating switch with a disconnection state of a contact visible, and belongs to the field of electrical equipment. The method comprises the steps that a contact chamber provided with a window for observing connection and disconnection states of a moving contact and a fixed contact, a handle and a connection terminal connected with the fixed contact are provided, a connection column is arranged on the connection terminal, part of the connection column is embedded into the connection terminal and is in interference fit with the connection terminal, a conductive first columnar part which is in interference fit with a power busbar is arranged on the connection column, a conductive second columnar part is coaxially arranged in the first columnar part, the first columnar part is in interference fit with the second columnar part, and the thermal expansion coefficient of the second columnar part is larger than that of the first columnar part. The isolating switch has the following advantages that more conductive areas are produced by the same overlapping length, the electric current density is reduced, and low temperature rise of the connection terminal is achieved; busbar usage is reduced, and resources are saved; electric clearance or safe distance is increased, and the electric safety of the equipment is improved.

Description

technical field [0001] The invention relates to the field of electric equipment, in particular to a design method of an isolating switch with a visible disconnected state of contacts. Background technique [0002] In the existing power complete equipment factory, construction workers install the isolating switch in the switch cabinet. The terminals of the isolating switch are usually directly connected with the power busbar, and the power busbar is directly connected to the terminal, and the terminal is connected to the power busbar. Usually the overlapping method is used, 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 usually necess...

AI Technical Summary

Problems solved by technology

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

The 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 Large spacing will inevitably result in larger dimensions of the entire isolating switch

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