Mains frequency variation

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jcx

Member
2003-02-17 7:38 pm
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I'm pretty sure my mains freq is 10 Hz higher!

I design instrumentation for worldwide sales, the "universal" linear supply power transformers are designed to "work" with the varying line freq and V of differing countries

but since iron and copper aren't free, the magnetizing current at high line V, low frequency (you 50 Hz types) sometimes cause fuse selection problems with low power equipment, I can't convince the transformer manufacturer that a 10x change in excitation current is a little steep for a 20% increase in Bmax
 
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