Power capacitors are passive electronic components used in power systems and electrical equipment. A power capacitor consists of two conductive plates separated by an insulating material called a dielectric. Multilayer dielectrics provide excellent temperature stability and frequency characteristics. Single layer dielectrics can also be used. Capacitance is a measure of energy storage capacity, typically expressed as C=KA/D, in units of F or KF. A is the area of the electrodes, D is their spacing, and K is a function of the dielectric between the electrodes.
What is the structure of a power capacitor?
The basic structure of power capacitors includes capacitor elements, fasteners, impregnating agents, casings, leads, and bushings.
The structural diagram of the power capacitor is shown below.
The rated voltage of power capacitors below 1kV is called low-voltage capacitors, and those above 1kV are called high-voltage capacitors. They are all made into three-phase, triangular connection lines, with internal components connected in parallel, and each parallel component has a separate fuse. High voltage capacitors are generally made as single-phase, with internal components connected in parallel. The shell is welded with sealed steel plates, and the core is composed of capacitor elements in series and parallel. The capacitor elements use aluminum foil as electrodes and are insulated with composite film. Insulating oil for capacitor underwear, such as mineral oil or dodecylbenzene, is used as the impregnating medium.
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