Method for machining connection row holes of secondary-winding outgoing lines of high-current transformers

Abstract

The invention discloses a method for machining connection bar holes of secondary-winding outgoing lines of high-current transformers. The method comprises connection copper bars of a transformer secondary winding, a special hole-opening tool and a support frame for positioning the special hole-opening tool, wherein the special hole-opening tool is a three-layer clamp plate; the middle of the clamp plate is provided with two positioning grooves; a midline of the clamp plate is provided with a plurality of through holes; clamping bolts are arranged in the through holes; two sides of the midlineare provided with three guiding holes respectively; and the space among the guiding holes is identical with that among mother-bar connection holes. The method fixes the connection copper bars of the transformer secondary winding in the special hole-opening tool so as to ensure that the connection copper bars and the mother-bar connection holes are identical in position, and adopts a hand-held drilling tool to drill connection holes on the connection copper bars through the guiding holes. Due to the method, the connection holes can be conveniently opened on the connection copper bars of the transformer secondary winding and accurately correspond to the positions of the connection holes on mother bars, so that the connection copper bars of the transformer secondary winding and the mother bars are in bolted connection.

Description

technical field [0001] The invention relates to a processing method for connecting a row of holes for the lead-out wires of a secondary winding of a large-current transformer. Background technique [0002] Large-scale high-current transformers are usually used in electric arc furnace steelmaking in metallurgical enterprises, and their output power is quite large. The output connection of the three-phase secondary winding of the transformer is a more critical part. If the connection is not good, it will cause a failure of poor electrical contact. , causing heat to burn out the transformer. At present, when this type of transformer is manufactured in China, the secondary winding of the transformer is usually connected to the copper bar and the busbar by welding, while some foreign transformers are connected by bolts. Facilitate disassembly and disassembly during troubleshooting and routine maintenance. Foreign transformer manufacturers have special tooling equipment for this...

AI Technical Summary

Problems solved by technology

Foreign transformer manufacturers have special tooling equipment for processing this type of connection. Since domestic transformer factories use the welding method, there is no bolt connection method in China.

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