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in GEAFOL Cast-Resin trnaformer of 11/.72kv which has
tapping of 11550v,11250,11000,10246v in primary side. To
obtain 700v. which tapping should be used of HV side as we
have 11000v/720v tapping now .
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Answer Posted / 7anoter4
If the primary voltage [supplied by Utility] it is NOW 11
kV and your transformer at no-load shows 720 V at its
secondary terminals the ratio primary/secondary voltage is
11/0.72=15.278. If you want to reduce the secondary to 700
V you have to change the ratio to 11/0.7=15.714.
Let's say the rated secondary voltage [at no-load] is 720 V.
That means the ratio 11250/720=15.625 it is the most
suitable and you'll get 11000/15.625=704 V at secondary
terminal [at no-load].
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