Transformers Selection Steps0 pages

Transformers

Selection Steps A. An online transformer product selector is available in the Transformer section of our website or you can use the following steps below to manually select a trans former.B. Find the elec trical load re quire ments. These are:1. Load operating voltage.2. Load frequency (ex pressed in Hz).3. Determine load size - usually expressed in kVA, amperage or horsepower.4. Is the load designed to operate on single phase or three phase power?This information is available from the equipment manufacturer and is typically listed on the nameplate of the equip ment.C. Know the supply voltage con ditions:1. Available source voltage.2. Available source fre quency (a transformer will not change frequency. The frequency of the supply voltage and the needed load voltage must be equal).3. Number of phases on power source.D. Determine the transformer kVA rating:1. If the load is expressed in kVA, select the appropriate transformer from the following selection charts (make sure the selected transformers kVA rating is equal to or greater than the required load kVA).2. If the load is expressed in amperage, use either the appropriate kVA formula listed below or the appropriate sizing chart on the next page.
kVA =Wattage(1000 x Power Factor of the load) 4. If the load is a motor and expressed in horse power, refer to the motor horsepower charts on the next page.Some sizes may require an optional weather shield (order separately) for outdoor use. 3. If the load is expressed in wattage, either utilize the formula below to convert to kVA or refer to the equipment nameplate to obtain amperage requirement. >

Always size the transformer to the load requirements.

kVA (1Ҙ) =Volts x Amps1000 kVA (3) =Volts x Amps x 1.7321000 >
Visit our website at www.solaheviduty.com or contact Technical Services at (800) 377-4384 with any ques tions. 179 >