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In U. S. household wiring the two primary phases of 110 to 120 volts rms are 180° out of phase with each other which is why the voltage measured from line 1 to line 2 is double that of each line measured to the common return. The outputs of two identical Transformers would therefore be additive if connected in series and in phase and subtractive if out of phase. Please note that if the phase relationship of the inputs is unknown, such as that coming from two independent portable generators, for example, the summed output voltage will be unpredictable.

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What is the applications of autotransformer?

power distribution Audio Railway


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The process of asingle-phase ac voltage generated from hydro-powerAnswerPower station alternators generate three-phase electricity as, for any given load, it is more economical in terms of the total volume of copper required by transmission lines, transformers, etc. Single-phase supplies are normally produced by small, portable, alternators. The difference between the two is the way in which the machines' armatures are wound. For a three-phase machine, there are three separate windings, physically displaced from each other by 120 degrees, so three phase voltages are produced which are 120 electrical degrees apart. Single-phase machines, on the other hand, have just one armature winding, and produce just one voltage.


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