What is the Significance of Half Crest Time in Power Transformer Data Sheets?

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ironsword
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Dears,
during reading power transformer (0.71/33) kv data sheet, I found term "half crest time" which equals to 0.8 s,
the question is: what is that time and why is important?
thanks and kind regards.
 
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It has to do with inrush current. I googled the phrase and found 8 references that can give you more detail.