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Locked Re: HT-37 transformer failure due to rapid STBY-->OFF-->STBY


 

Hi Jim,
I stated quantities in peak-to-peak units.? That's what the little "pp" in mApp means.? It's more commonly used to represent a voltage: Vpp denoting peak-to-peak volts is probably more familiar.? For sinusoidal waveforms, one can divide Vpp by 2*sqrt(2) to get Vrms.?
Perhaps I should explain the cos(30 deg) in my original post.? This is the power factor due to the phase lag.? 360 degrees * 1.5 ms / 16.7 ms is 32 degrees but I rounded it to 30 degrees for simplicity.
Cheers,
Halden

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