Because the advantages of shell-form transormaers have been known gradally. more and more shell-form transformers have been put into use in recent years. The analysis, research and production preparationof design have begun in China. A calculation program of impulse voltage distribution in interleved windings of transformer has been developed. A verity test in interleaved windings has also been performed successfully. The results calculated by the program is in consistence with the results measured by the test.
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