How to troubleshoot wye-delta starter?

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  1. In my wanderings I found a web page referring to 12 pulse rectifiers. 12 pulses are done with 3 phase transformer with a wye and a delta secondary.
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  5. EGGN 281 Lecture 5 - Delta-Wye Transforms :

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  10. 21. Wye Delta or Y delta Transform :

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