Classification
The many uses to which transformers are put leads them to be classified in a number of different ways:
By power level: from a fraction of a volt-ampere (VA) to over a thousand MVA;
By frequency range: power-, audio-, or radio frequency;
By voltage class: from a few volts to hundreds of kilovolts;
By cooling type: air cooled, oil filled, fan cooled, or water cooled;
By application function: such as power supply, impedance matching, output voltage and current stabilizer, or circuit isolation;
By end purpose: distribution, rectifier, arc furnace, amplifier output;
By winding turns ratio: step-up, step-down, isolating (near equal ratio), variable.
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