Line Reactors For VFDs
Line Reactors protect Variable Frequency Drives (VFDs) from input power line disturbances by smoothing and slowing down incoming voltage distortion. They also reduce harmonics generated by the VFD that travel back into the power line. A line reactor is coil of wire that forms a magnetic field that current flows through. The magnetic field limits the rate of the rise of the current, reducing harmonics.
Line Reactors help to stabilize the current waveform and act as an impedance between the power source and the VFD. The impedance will protect the input section of the VFD and reduce the harmonic current drawn from the power system by the drive.
The applied impedance of the reactor will work to soften and slow down the incoming line voltage distortion, such as surges and spikes, when applied to the input side of a VFD. This will help to prevent drive over-voltage faults and damage to the drive input components when line voltage deviations occur. Line disturbances are common on power systems with power factor correction capacitors coming off and on line, as well as the fluctuation of high current loads. Reactors also mitigate harmonic currents being drawn by the drive and help to block background incoming line voltage harmonics which can affect the operation of the VFD.
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