Siemens DTU3005-B Especificaciones descargar pdf (Pagina 22)

Frequency and Harmonics

We learned earlier that frequency is a measurement of the

number of times voltage and current rises and falls to

alternating peak values per second. Frequency is stated in hertz.

The standard power line frequency in the United States is 60

hertz (60 cycles per second). In many other parts of the world

the standard frequency is 50 hertz.

Harmonics Harmonics are created by electronic circuits, such as, adjustable

speed drives, rectifiers, personal computers, and printers.

Harmonics can cause problems to connected loads.

The base frequency of the power supply is said to be the

fundamental frequency or first harmonic. The fundamental

frequency or first harmonic of a 60 Hz power supply is 60 Hz.

Additional harmonics can appear on the power supply. These

harmonics are usually whole number multiplies of the first

harmonic. The third harmonic of a 60 Hz power supply, for

example, is 180 Hz (60 x 3).

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Siemens DTU3005-B Especificaciones Pagina 22