Working Principle and Function of Filter Reactors

Filter reactors are essential equipment in power systems used to suppress harmonics and provide reactive power compensation, often employed in conjunction with capacitors. So, what exactly are the working principle and function of filter reactors in application?

 

I. Working Principle of Filter Reactors

 

The core principle of filter reactors lies in utilizing the characteristics of inductance to suppress harmonic currents and adjust system impedance. Their working principle is as follows:

 

The operation of reactors is based on the properties of inductance. When alternating current passes through an inductor, the inductor generates a back electromotive force, which is proportional to the rate of change of the current, creating impedance. In power systems, reactors provide the necessary impedance to limit the increase in current. Additionally, the inductive characteristics of reactors allow them to absorb certain high-frequency harmonics, thereby serving a filtering function.

 

II. Functions of Reactors:

 

Limit Short-Circuit Current: During short-circuit faults in the power system, reactors increase the circuit impedance to limit the short-circuit current, thereby protecting downstream equipment and lines from overcurrent damage.

 

Suppress Harmonics: Various frequencies of harmonics exist in power systems, which can cause equipment overheating and malfunctions. Reactors effectively reduce harmonic currents, optimizing the system's operational condition.

 

Improve Power Factor: By adjusting the phase of the current, reactors can enhance the power factor of the power system, reduce the impact of reactive power, and improve equipment operating efficiency.

 

Enhance System Stability: By controlling current and voltage, reactors can improve the overall stability of the power system and reduce the occurrence of faults.