When wired as an autotransformer the maximum current capacity of any winding of a transformer is the same as when it is used as a conventional transformer.
The voltages currents and turns ratio still conform to the equations given.
Although the autotransformer can deliver more apparent power (S in volt-amperes) than the transformer alone the transformer itself cannot safely deliver more apparent power than its rating.
Because autotransformers can be connected in several different ways rather than attempt to memorize the equations used to analyze each it is easier to gain a fundamental understanding of how a basic autotransformer operates and then develop the governing equations as needed.
26 Potential transformer and current transformer application. 27 14-12 Useful Transformer Tips
The core losses in a transformer are determined by the applied voltage and frequency. Winding currents have no bearing on core loss. Reducing the load on a transformer will not reduce its core loss.
The copper losses in a transformer are proportional to the squares of the winding currents and the square of the frequency. The applied voltage has no bearing on the copper loss.
The maximum current that can be carried safely by a transformer winding is determined only by the wire gauge of the windings. The dimensions of the core and applied voltage have no bearing on maximum current capacity. Operating a transformer at a reduced voltage will not change its maximum current capability.
The real power (watts) that can be delivered safely by a transformer is the volt-amp rating of a transformer times the power factor of the load it is powering. For example a 1-kVA transformer can deliver only 700 watts to a 0.7-power-factor load.
Transformers are designated to be most efficient when operated at full rated load (that is rated voltage and rated current). Operating a transformer at reduced load current or reduced voltage reduces its efficiency.
Transformers may be operated at lower frequencies if their voltage and apparent power ratings are derated by the same ratio as the frequency reduction.
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