How does transformer taps work?

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janu203
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In the question below i know 200/480 V is rated voltage at primary and secondary side of a transformer, but '13' is what i do not know. Also how does the solution work out? i have tried every possible thing. Thanks(Sorry if i could not phrase my question in accordance to the pattern)

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BvU said:
It is not 13, 200 but 13200 V
omg! what was i thinking. Lack of sleep yesterday night may be causing this weird behavior .
 
janu203 said:
omg! what was i thinking. Lack of sleep yesterday night may be causing this weird behavior .
Possibly:wink:.
I often make ridiculous arithmatic mistakes when I am sleep-deprived.

In practice, distribution transformers are always step-down transformers, so you won't find any 200/480 transformer.