For a capacitor, if the potential difference between the two stages is 1 volt when there is 1 library of electricity, the capacitance of this capacitor is 1 method, that is: C=Q\/U
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2, but the size of the capacitor is not determined by Q (with electricity) or U (voltage), that is: C=εS\/4πkd. Where ε is a constant, S is the opposite area of the capacitor plate, d is the distance of the capacitor plate, and k is the electrostatic constant. For common parallel plate capacitors, the capacitance is C=εS\/d. (ε is the dielectric constant of the medium between plates, S is the plate area, and d is the distance between plates.)
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3, the capacitor potential energy calculation formula: E=CU^2\/2=QU\/2
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4, multi-capacitor parallel calculation formula: C=C1 C2 C3... Cn multi-capacitor series calculation formula: 1\/C=1\/C1 1\/C2... 1\/Cn
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5, the capacitor for high frequency AC obstruction effect is reduced, that is, the capacitive reactance is small, whereas the capacitor for low frequency AC generated by the capacitive reactance is large; For the same frequency of AC electricity. The larger the capacity of the capacitor, the smaller the capacitive reactance, and the smaller the capacity, the greater the capacitive reactance
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6, series voltage division ratio: the larger the capacitor, the smaller the voltage. Parallel shunt ratio: the larger the capacitor, the larger the current
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7, when t=RC, capacitance voltage =0.63E; When t=2RC, the capacitance voltage is 0.86E; When t=3RC, capacitance voltage =0.95E; When t=4RC, capacitance voltage =0.98E; When t=5RC, capacitance voltage =0.99E; T units SR units Ohms C units F
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8, T time voltage: Vt=V0 (V1-V0)*[1-exp(-t\/RC)]
Power capacitor is a device used to store electrical energy, which is mainly used to reduce frequency disturbance, improve voltage waveform and improve the quality of power system.
In principle, a capacitor is a capacitor with a certain capacity of charge, which can convert part of the current into voltage, so that the frequency disturbance can be reduced to meet the safe operation of the power system.
The basic principle of the power capacitor is that it will store electrical energy through its own capacitor circuit, and when the voltage passes through it, it will immediately release the electrical energy, so as to achieve voltage regulation.
Capacitors are referred to as capacitors and are represented by the letter C. It is made up of any two conductors (electrodes) that are insulated from each other and are very close together.
In a direct current circuit, a capacitor is an electronic component that can store charge, equivalent to a circuit break, which has charge and discharge characteristics and the ability to prevent direct current from flowing through and allow AC current to pass through.
In the process of charging and discharging, the charge on the two plates has an accumulation process, that is, the voltage has a building process, so the voltage on the capacitor can not be changed.
Power capacitor is an electronic circuit component, mainly used to store electricity, improve the power factor of the circuit, suppress harmonics, power filter, suppress surges, etc.
Capacitors are composed of positive electrode, negative electrode and medium, of which the medium is divided into dielectric capacitors and non-dielectric capacitors, dielectric capacitors are mainly oil-immersed capacitors, gas capacitors, insulating oil-immersed capacitors, non-dielectric capacitors are mainly electrolytic capacitors, film capacitors, fixed capacitors and so on