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Converter Transformers

These Transformers are used to supply variable speed drives (VSD) for motor control. A VSD typically injests a whole spectrum of harmonics into the supply lines, and the transformers design needs to accommodate these harmonics. A convertor transformer is typically rated at 100% capacity, when a Distribution transformer is typically rated at 80% capacity. VSD drives are based on power electronic and usually require a neutral line, hence the most common vector group is DYn11, i.e. a Delta Primary with a star Secondary with the neutral point brought out.
 



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