Isolating switch operated on front side

Abstract

The invention discloses an isolating switch operated on the front side, which belongs to the field of power devices and particularly relates to an isolating switch operated on the front side. The isolating switch disclosed by the invention comprises a contact room, a handle arranged on the front side of the switch and wiring terminals connected with static contacts. A connection column is arranged on the wiring terminal, the connection column is partially embedded in the wiring terminal and in interference fit with the wiring terminal, a conductive first column-shaped part in interference fit with a power busbar is arranged on the connection column, the first column-shaped part is internally coaxially provided with a second conductive column-shaped part, the first column-shaped part and the second column-shaped part are in interference fit, and the thermal expansion coefficient of the second column-shaped part is larger than that of the first column-shaped part. The isolating switch disclosed by the invention has the following beneficial effects that a more conductive area can be generated with the same overlapping length, the current density is further reduced, and low temperature rise of the wiring terminal is realized; usage of busbars can be reduced, and resources are saved; and electrical clearance or the safety distance is increased, and the electrical safety of the device is improved.

Description

Technical field [0001] The invention relates to the field of power equipment, in particular to a front-operated isolating switch. Background technique [0002] In the existing power plant, the construction personnel install the isolating switch in the switch cabinet. The connecting terminal of the isolating switch is usually directly connected by the electric bus bar, the electric bus bar is directly connected to the connecting terminal, and the connecting terminal is connected with the electric bus bar. Usually use overlap lap method, and then tighten with bolts. Such as image 3 with Figure 4 As shown, this connection method needs to overlap the bus bar and the terminal by a certain length, so that the current density of the contact surface is maintained within a certain range, so that the temperature rise at the connection meets the relevant standards. In order to reduce the temperature rise of the connection, it is usually necessary to increase the overlap length of the busb...

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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