Difference Between Reactor and Capacitor
1. Different structure
The reactor is the inductor, the structure of the inductor is similar to that of the transformer, but there is only one excitation coil;
Capacitors are two conductors close to each other with a non-conductive insulating medium sandwiched between them.
2. Different functions
The series reactor is mainly used to limit the short-circuit current and maintain the bus voltage;
The shunt reactor is used to compensate the capacitance current of ultra-high voltage long-distance power transmission lines, prevent the terminal voltage of light-load lines from rising, and maintain the voltage stability of the transmission system; improve the voltage distribution along the line and the reactive power distribution in the light-load lines, reduce line losses, and reduce potential Supply current, accelerate the extinguishing of the submerged arc, and improve the success rate of automatic reclosing of the line;
Appropriate selection of reactors and the use of inverters can effectively prevent the impact of overvoltage and surge current caused by operating the incoming switch, and can also reduce the pollution of the power grid caused by harmonics generated by the inverter. It can improve the power factor of the inverter.
Capacitors are capacitive loads and are mainly used to compensate for reactive power and energy storage.
3. Different characteristics
Inductance has the function of "blocking AC and passing straight", that is, using the characteristics of inductive reactance in the AC circuit to "pass low-frequency DC and block high-frequency AC". Capacitors have the function of "communicating and blocking DC", that is, using the frequency characteristics of capacitive reactance in AC circuits to "pass high-frequency AC and block low-frequency DC".
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