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why transformer impedance measure in % (percentage)
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Answer Posted / 7anoter4
Usually group of transformers presents the same short-
circuit reactance in %
For instance, for S[ rated power] up to 2500 [to 3000] kVA
the percent reactance will be vk%=4-8. Ohmically calculated
reactance will be V^2/S*vk%/100 [ V=rated voltage].
For V=10 kV and vk%=6 for S=500 kVA Xk=10^2/0.5*6/100=12
ohm
For V=6 kV and vk%=6 for S=3000 kVA Xk=6^2/3*6/100=0.72 ohm
As one could see it is more convenient to consider only
vk% instead of ohmic reactance
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