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line donuts as CT chokes
Posted by Ken Gilbert on June 18, 2002 at 04:38:17:
it would work, but don't expect to put more than 115vac across the primary--more than that (i'd say around 130) will saturate the core.
you could test the max input voltage with a variac and a current meter... with just the primary across the line, slowly increase the input voltage. the large reactance of the winding @ the line frequency will prevent much current from flowing. as you continue to advance the input voltage with the variac, when the current drawn from the line increases greatly you know you have reached the point of saturation, and that represents the max primary voltage that will be tolerated.