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Autotransfomer standard sizes & ratio

Autotransfomer standard sizes & ratio

Autotransfomer standard sizes & ratio

(OP)
There is an idea to have an Autotransformer of 500MVA 380/34.5kV. But we want to avoid the none standardized sizes/ratio(HV/LV).

Appreciate your help to know if such ratio (380/34.5kV) is widely used. Also, please help to know some references for the standard sizes & ratio, worldwide.

Thanks in advance.
 

RE: Autotransfomer standard sizes & ratio

Never an auto-transformer is used for such voltage ratio.No advantage,in terms of cost and efficiency.Auto transformers are economical only up to a voltage ratio of 3.See earlier threads on auto-transformers 238-315162

RE: Autotransfomer standard sizes & ratio

Also see Thread 238-300301. 500 MVA is a popular size.Nearest sizes  in grids are 315 MVA and 630 MVA.Voltage ratios for auto-transformers are  380/220 or 380/110 or 132 KV.

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