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what does the transformer connection symbol YNaod1 mean ?

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what does the transformer connection symbol YNaod1 mean ?..

Yna0d1 means star connected hv winding with neutral brought
out, auto transformer with 0 degrees displacement. lv
winding delta connected legging hv winding by 30 degrees.

Y = star connection
n = neutral brought out
a = auto transformer
0 = zero degrees
d = delta connection
1 = 30 degrees lag

 Is This Answer Correct ? 64 Yes 6 No

what does the transformer connection symbol YNaod1 mean ?..

you all people must be knowing about the symbols like YN and
d1 but what about a0. The 'a' represents that is
auto-transformer and 0 represents that there is 0 phase
difference b/w H.V. and I.V.(intermediate voltage) winding
since both are star-star. d1 means the transformer has a
tertiary winding which is delta connected and this delta is
lagging the H.V. winding by 30 degree.
There is no symbol for Intermediate voltage becoz all EHV
transformers are star-star connected.

 Is This Answer Correct ? 28 Yes 1 No

what does the transformer connection symbol YNaod1 mean ?..

Y N = HV winding in STARā­ connected with NEUTRAL., a=auto transformer with IV winding, oy= open LV winding and STAR connected 1=angle of deviation 1°

 Is This Answer Correct ? 0 Yes 0 No

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