Iron-cored grounding shield and making method thereof

Abstract

The invention discloses an iron core ground screen, which comprises the following parts: paper board, screen band and ground piece, wherein the screen band is attached on the paper board; the ground piece is covered on the screen band. The making method of iron core ground screen comprises the following steps: making stainless steel into screen band on the paper board with welding point position not fastening the paper board; adopting capacitance energy-storage point welding equipment to weld ground plate of stainless steel on the screen band with equal distance. The invention reduces swirl consumption of transformer greatly, which avoids the electric potential suspending discharging phenomenon to guarantee the safety operation.

Description

technical field [0001] The invention belongs to the technical field of reactors and transformers, in particular to an iron core ground screen and a manufacturing method thereof, and is especially suitable for high-voltage, large-capacity reactors and transformers. Background technique [0002] Existing reactors and transformer body iron cores and ground screens mostly use such as figure 1 structure shown, figure 2 for figure 1 left view of . It includes ground sheet 1, shielding copper tape 2, and cardboard 3. Both the shielding copper strip 2 and the grounding piece 1 are made of copper strips. When making the shielding copper strips 2, first glue the shielding copper strips 2 to the cardboard 3, and then put a piece of solder on the solder joints 4 of each shielding copper strips, and then put the The ground sheet 1 is covered on the shielded copper strip 2 and heated again with an electric soldering iron at the position of the solder joint 4 of the copper strip groun...

AI Technical Summary

Problems solved by technology

Reactors, especially high-voltage and large-capacity reactors, will generate huge magnetic flux leakage during operation, which will easily cause large eddy current losses in the shielded copper strip 2, resulting in local heating of the core and ground screen, affecting its safe operation; while the shielded copper strip 2. The connection with the ground plate 1 adopts soldering process, which is the weak link in the safe operation of the reactor. After being heated, the strength of the soldered joint is reduced. If it is subjected to large vibrations, the connection may fall off and cause the potential of the core ground screen to suspend and discharge, causing serious operational failure; secondly, when the shielded copper strip 2 is welded, the temperature of the ferrochrome is difficult to control, and when overheating will cause the cardboard 3 to be thermally insulated and aged, and the insulation performance will decline

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