voltage-regulating transformer

voltage-regulating transformer

[′vōl·tij ¦reg·yə‚lād·iŋ tranz′fȯr·mər] (electromagnetism) Saturated-core type of transformer which holds output voltage to within a few percent (5% above or below normal) with input variations up to 20% above or below normal; considerable harmonic distortion results unless extensive filters are employed.