By Whitaker, Jerry C
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Extra info for AC power systems
Because a changing magnetic field produces the same voltage in each turn of the coil, the total voltage induced in a coil is proportional to the total number of turns. If no energy is lost in the transformer, the power available in the secondary is equal to the power fed into the primary. 9 Physical construction of an E-shaped core transformer. The low- and high-voltage windings are stacked as shown. the primary is equal to the product of current and voltage in the secondary. Thus, the two currents are inversely proportional to the two voltages, and therefore, inversely proportional to the turns ratio between the coils.
A dc current is made to flow in the rotor winding (or field winding), and this results in a magnetic field (rotor field). When the rotor is made to rotate at a constant speed, the three stationary windings aa', bb', and cc' experience a periodically varying magnetic field. Thus, an emf is induced across these windings in accordance with Faraday's law. 26 Generator circuit configurations: (a) wye; (b) delta. each period corresponds to one revolution of the rotor. 27 Output waveform of a three-phase generator.
Different types of transformers are used for varied purposes, from voltage level changes to phase angle regulation . Because the primary circuits of distribution systems are designed for high voltages (in order to increase their load-carrying capability), the voltage must be stepped down at the consumer service entrance. Transformers can be classified as distribution transformers and power transformers. The former type normally steps down voltages from primary voltage levels, such as 2400, 4160, or 13,800 V to 120 or 240 V.
AC power systems by Whitaker, Jerry C