Tesla Superchargers get New Mystery Box! EXPLAINED!

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Tesla Superchargers get New Mystery Box! EXPLAINED!
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Recently, some new hardware has been accompanying new, and also retrofitted onto existing Superchargers. As most supercharger cabinets and equipment (other than the stalls) are fenced off, it's generally hard to get a good look. This new location in Cincinnati had not yet had its fence built, so I went “Exploring”.

Manufacturer is http://www.control-transformer.com/home.asp?ID=2

Question: What is an AutoTransformer?

Answer: An autotransformer has its primary and secondary connected to each other electrically. A portion of the energy in an autotransformer comes from this connection while the balance comes directly from the supply. Building inspectors often object to autotransformers because they do not isolate one circuit from the other. One ground may be at a considerably higher voltage than the ground in another section of the same circuit. Local inspectors and utility companies should be consulted before installing autotransformers. Where the use of autotransformers is not objectionable, they do represent a considerable saving in price over that of a regular separate winding transformer. This saving varies as the ratio of windings changes. After the ratio of windings reaches approximately 4:1 or 5:1, there is very little economy in using an autotransformer. Autotransformers are most practical where a small percentage of voltage raising or lowering is required and isolation between the two circuits is not required. Autotransformers can be single phase or three phase. In neither case is any isolation provided.

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