3-limb amorphous metal cores for three-phase transformers

Abstract

The present invention relates to improved transformer cores formed from wound, annealed amorphous metal alloys, particularly multi-limbed transformer cores. Processes for the manufacture of the improved transformer cores, and transformers comprising the improved transformer cores are also described.

Description

technical field [0001] The present invention relates to transformer cores, and more particularly to transformer cores made from strips or strips of ferromagnetic material, especially amorphous alloys. Background technique [0002] Transformers traditionally used in distribution, industrial, power and dry applications are usually of the wound core or stacked core variety. Wound core transformers are generally used in high capacity applications such as distribution transformers because the wound core structure facilitates automated mass manufacturing techniques. Apparatus have been developed to produce a core and coil assembly by wrapping ferromagnetic core strip around the window of a prefabricated multi-turn coil and passing it through. But the most common manufacturing procedure involves winding or stacking the core without relying on prefabricated coils with which the cores are finally connected. The latter approach requires that the core be made with one or more joints ...

AI Technical Summary

Problems solved by technology

The stresses induced on the laminations during the opening and closing of core joints often cause core losses and permanent increases in field power and permanent reductions in transformer operating efficiency in the completed transformer

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