What is the empirical formula for calculating the value of window space factor?
(a) window space factor = 10 / (30+kV)
(b) window space factor = 5 * (30+kV)
(c) window space factor = 10 * (30+kV)
(d) window space factor = 5 / (30+kV)
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I'd like to ask this question from Window Space Factor in portion Design of Transformers of Design of Electrical Machines