How a line reactor works
A line reactor (also known as a choke or AC reactor) is used in electrical drive systems to reduce current peaks and minimize power quality issues.
In installations where a
variable frequency drive (VFD)
is used, the current can fluctuate significantly due to the switching of power electronics.
A line reactor smooths these current variations.
As a result, the load on both the variable frequency drive and the electrical grid is reduced.
Within modern industrial automation, a line reactor is therefore an essential component of reliable
drive technology and stable motor control.
How does a line reactor work?
A line reactor is essentially an inductive coil that resists rapid changes in current.
When the current suddenly increases or decreases, the coil generates a counteracting inductive voltage that slows down this change.
Thanks to this property, current peaks are reduced and the waveform becomes smoother.
This helps to limit harmonic distortion in the electrical grid while also protecting the drive electronics.
For more background information on variable frequency drives and drive systems, see the
Fluxcon variable frequency drives wiki.
Why use a line reactor?
When variable frequency drives are connected directly to the power grid, harmonic currents can occur.
These harmonics can lead to additional heat in cables, transformers and other electrical components.
A line reactor helps reduce these effects by improving the current waveform and limiting peak currents.
This extends the lifespan of electrical components and ensures stable system operation.
Applications of line reactors
Line reactors are commonly used in installations where variable frequency drives or other power electronic drives are applied.
Typical applications include:
- Pumps and fans
- Conveyor systems
- Compressors
- Industrial production lines
- Installations with multiple variable frequency drives
In these applications, the line reactor ensures a more stable current and better protection of both the variable frequency drive and the electrical grid.
Selection of a line reactor
When selecting a line reactor, factors such as the rated current of the drive, the supply voltage and the required impedance must be considered.
In addition, the application plays a role, for example whether the reactor is used for harmonic reduction or for protecting the variable frequency drive.
For questions about using line reactors in combination with variable frequency drives, you can also consult our
frequently asked questions about variable frequency drives.
Fluxcon variable frequency drive product range
Fluxcon’s product portfolio consists of electronic components for controlling electric motors.
The range includes product groups such as variable frequency drives, soft starters, braking resistors, brake choppers, line reactors and mains filters.
Customers choose Fluxcon based on practical, no-nonsense engineering.
We offer an excellent price-performance ratio and fast delivery.
Fluxcon engineering delivers solutions based on practical expertise.
Simple solutions are often the best solutions.
Fluxcon strives for transparency in its approach and works closely with customers to find the most suitable solution for each process or application.
In addition, our products are brand-independent.
For example, a braking resistor can also be used with variable frequency drives from other manufacturers.
