Siemens DTU3005-B Especificaciones descargar pdf (Pagina 11)

AC voltage can either be single- or three-phase. While single-

phase power is needed for many applications, such as lighting,

utility companies generate and transmit three-phase power.

Three-phase power is used extensively in industrial applications

to supply power to three-phase motors. In a three-phase system

the generator produces three voltages. Each voltage phase

rises and falls at the same frequency (60 Hz in the U.S., 50 Hz in

many other countries); however, the phases are offset from

each other by 120°.

Measuring AC Values Measuring AC is more complex than DC. Depending on the

situation, it may be necessary to know the peak value, peak-to-

peak value, instantaneous value, average value, or the RMS

(root-mean-square) value of AC.

Peak Value The peak value of a sine wave occurs twice each cycle, once

at the positive maximum value and once at the negative

maximum value. The peak voltage of a distribution system

might be 650 volts, for example.

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Siemens DTU3005-B Especificaciones Pagina 11