Transformer Connection code
As part of TPL007, I am performing GIC studies at our 345/138kV (Auto Transformers). I had a question regarding the connection codes of auto- transformers.
PSS/E documents state :
Vector Group: YNa0 Type = Core CC= 18,
Vector Group: YNa0 Type = Shell CC= 21
What is the difference between CC = 18 and CC = 21 ?
18 = Series path, ground on each side. 21 = Series path, no ground on each side.
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