Primary wiring board of casting current transformer

Abstract

The invention discloses a primary wiring board of a casting current transformer, and relates to the technical field of the current transformer. The primary wiring board of the casting current transformer comprises the primary wiring board, a welding point, a primary coil and a secondary coil. The lower end of the primary coil is provided with the secondary coil. The top end of the primary coil is provided with the welding point. The welding point is welded with the primary wiring board by a cold welding machine. According to the primary wiring board of the casting current transformer, the primary wiring board is welded by using the cold welding machine, the conductive section area after welding is the same as that of the oxyacetylene welding, the high temperature is not generated, the primary winding insulation is not affected, the primary wiring board does not produce the thermal deformation, and a milling wiring board is not needed after the product casting.

Description

technical field [0001] The invention relates to the technical field of current transformers, in particular to a primary wiring board for cast current transformers. Background technique [0002] The current installation method of the primary winding outlet terminal board of the epoxy cast current transformer is oxyacetylene welding or bolted connection. These two methods have obvious disadvantages. Oxyacetylene welding causes deformation of the terminal board after welding due to the high temperature of the acetylene flame. After casting, milling is required to make the surface of the terminal board flat and then brush the surface of the terminal board. At the same time, the high temperature during welding has a negative impact on the primary winding. The wrapped insulation has a greater impact and must be managed to cool down. Although the bolt connection has no adverse effects of high temperature, the effective contact area of ​​the conductive surface is small, and the res...

AI Technical Summary

Problems solved by technology

These two methods have obvious disadvantages. Oxyacetylene welding causes deformation of the terminal board after welding due to the high temperature of the acetylene flame. After casting, milling is required to make the surface of the terminal board flat and then brush the surface of the terminal board. At the same time, the high temperature during welding has a negative impact on the primary winding The insulation effect of wrapping is greater, and it is necessary to try to cool down

Although the bolt connection has no adverse effects of high temperature, the effective contact area of ​​the conductive surface is small, and the resistance of the connection surface is large, which will cause the temperature at the contact surface to rise

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