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Autotransformers

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2000Kvar

Electrical
May 29, 2006
12
In the case of bulk power transfer, why is the autotransformer between the two lines grounded WYE: grounded WYE? ie 500KV:230KV or 230Kv:69KV
 
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Wye not? It provides a defined phase to ground voltage and nice clean connections; try to draw out the connection diagram for a delta-delta autotransformer.
 
Usually to avoid a phase shift. Delta connected autotransformers cause a phase shift.
respectfully
 
The earthy end of the winding can be insulated to a lower voltage than the line end in a star connected design is used. A delta connection requires the full winding to be insulated for line voltage. At very high voltages the insulation takes up a signficant amount of the core window so the saving can be significant.


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Try drawing a Delta-Wye autotransformer.
 
Good one! BJC!

Gunnar Englund
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
 
I had considered saying something about wye-delta autotransformers but the concept was so outlandish I didn't bother. You could do an open delta autotransformer using two single-phase autotransformers but there just isn't a way to close it.
 
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