Common Classifications of Low-Voltage Filter Reactors
Oct 11, 2025| Low-voltage filter reactors are primarily used in low-voltage power systems to filter out harmonics and improve power quality. Based on different classification standards, low-voltage filter reactors can be divided into the following categories:
I. Classification by Structure and Cooling Medium:
1. Air-core reactors: These have no iron core and are suitable for low-power applications.
2. Iron-core reactors: These contain an iron core and are suitable for applications requiring larger inductance.
3. Dry-type reactors: These use air cooling and are suitable for environments with specific requirements.
4. Oil-immersed reactors: These use insulating oil for cooling and are suitable for high-power applications.
II. Classification by Connection Method:
1. Series reactors: Used to suppress current fluctuations and protect equipment and the power grid.
2. Shunt reactors: Used to compensate for capacitive reactance in the system and regulate current.
III. Classification by Function:
1. Current-limiting reactors: Used to limit current and protect equipment and the power grid (for high-current equipment or lines).
2. Filter reactors: Used to eliminate harmonics in circuits and improve power quality (e.g., in industrial frequency furnace filter cabinets).
3. Smoothing reactors: Used to balance voltage and current in DC circuits and enhance stability (e.g., connected in series after medium-frequency furnace rectifier currents).
4. Power factor compensation reactors: Used to improve the power factor of power systems (e.g., in compensation cabinets).
IV. Classification by Application:
1. Line in/out reactors: Used to protect frequency converters and related products, preventing voltage surges and electromagnetic interference (commonly used in frequency converter applications).
2. Starting reactors: Used to limit the starting current of motors, protecting the motors and the power grid.
3. Saturable reactors: These feature adjustable inductance and are suitable for applications requiring inductance regulation.