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Old 21st March 2005, 04:04 PM   #11
jcx is offline jcx  United States
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line power xfmrs have very nonlinear core operating point - the manufacturers don't make money by giving you more iron and Cu - you have to spec it and pay for it in a custom design

nonimal inducatnce can be determined from the primary current with the secondary open - Line V warning! don't mess around

sec inductance is proportional to pri L by n^2, R series is easily measured, line xfmr K usually a question of "how many 9s" - .99, .999, ...

inrush sim will be inaccurate due to core nonlinearity - core sat models can be done but are complicated - the nominal linear model at least gets you started but you'll have to measure the real thing
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