Reactor (1)

LV Power Harmonic

Blocking Reactor

CSC GE-RT3

They are typical a rectifier, an inverter, a variable speed drive, a switched mode power supply, an electric welding machine, an arc furnace, a discharge lighting or other electronic loads.

As the current in these systems is interrupted by a switching action, the current itself contains frequency components that are multiples of the power system frequency. It may happen then that these harmonic components resonate with the natural frequency of the net-transformer-capacitors oscillating circuit.

Additional over currents may result, which produce system overloads, damage the capacitors and other components, and trip the safety devices off.