Siemens DTU3005-B Especificações descarregar pdf (Página 29)

Reactive Loads Circuits with inductive or capacitive components are said to be

reactive. Most distribution systems have various resistive and

reactive circuits. The amount of resistance and reactance varies,

depending on the connected loads.

Reactance Just as resistance is opposition to current flow in a resistive

circuit, reactance is opposition to current flow in a reactive

circuit. It should be noted, however, that where frequency has

no effect on resistance, it does effect reactance. An increase in

applied frequency will cause a corresponding increase in

inductive reactance and a decrease in capacitive reactance.

Energy in Reactive Circuits Energy in a reactive circuit does not produce work. This energy

is used to charge a capacitor or produce a magnetic field around

the coil of an inductor. Current in an AC circuit rises to peak

values (positive and negative) and diminishes to zero many

times a second. During the time current is rising to a peak

value, energy is stored in an inductor in the form of a magnetic

field or as an electrical charge in the plates of a capacitor. This

energy is returned to the system when the magnetic field

collapses or when the capacitor is discharged.

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Siemens DTU3005-B Especificações Página 29