A capacitor is a component that can store electrical energy. The structure is very simple. It consists mainly of a layer of non-conductive insulating medium sandwiched between two adjacent conductors. Its symbols in the circuit are indicated by the letter C , and FIG. 1 is a physical outline view of a three-phase power capacitor and a single-phase capacitor.
Capacitor function and application: In the strong electricity to improve the power factor as reactive power compensation, that is, our common reactive power compensation cabinet; used in the circuit for filtering, filtering out interference, absorbing high-frequency harmonics, the common Active filter cabinet; start capacitor in the motor power supply circuit; DC blocking capacitor has the function of isolating DC and passing AC.
The unit of capacitance is F (method), and the commonly used unit is μ F (micro method).
1F = 10 6 μ F = 10 9 nF (nano) = 10 12 pF (skin method).
Many capacitors are marked with the range of use of the capacitor, that is, the rated voltage and capacitance of the capacitor are marked on the outer casing of the Arong flag. As shown in Fig. 2 , the rated voltage of the capacitor is AC 200/. 275V, the electric capacity of 150 μ F.
Generally, a starting capacitor is installed in the starting circuit of the motor, and the charging and discharging of the capacitor can relieve the AC voltage peak pulse in the power supply circuit when starting, and the motor is prevented from being impacted by a large current.
In addition, on the power supply side of the Power Transformer, a capacitor with a large power is also installed to improve the power factor and reduce the power consumption, which is called a power capacitor. There are many types of capacitors, such as dry capacitors, oil-filled self-cooling capacitors.
