![]() ![]() While standard transformers alter the input voltage to a value of output voltage that may be substantially different from the input, buck-boost transformers are designed to make more modest changes to voltage levels, usually less than +/- 30 percent.īuck-boost transformers consist of two primary windings and two secondary windings. ![]() The 2008 National Electric Code (NEC) Handbook Section 210.9 defines a buck-boost transformer as one that “…provides a means of raising (boosting) or lowering (bucking) a supply line voltage by a small amount (usually no more than 20 percent). For example, a motor that is operated at a level of voltage which is significantly below its rated value may run constantly on its starter windings, resulting in overheating and possible burnout. Should the supply voltage to equipment be unstable, the performance of that equipment may be impacted, causing it to not operate at peak efficiency, or in extreme cases, premature equipment failure may result. The need to raise the supply voltage might result from a drop in line voltage due to equipment demand on the power distribution system, or from line losses. Buck-boost transformers, sometimes used as push-pull transformers, are a type of transformer that is used to supply power to electrical equipment in cases when the voltage requirements of that equipment are different from the available line or supply voltage. ![]()
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