What is Line/Load Reactor used for in frequency inverter?

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What is Line/Load Reactor used for in frequency inverter?

About Harmonics
Harmonics, or multiple frequencies of the original, are always present on the supply and come from many different types of equipment connected to the supply. Some harmonics are introduced by iron cored components such as motors and transformers, but by far the greatest source of harmonics are electronic rectifiers as found in inverters and switched-mode power supplies.

Three phase harmonic compensated line or load reactors allow one to "clean up" the voltage being sent to the motor from a frequency inverter. Harmonic compensation maximizes the reactor's benefit to the frequency inverter input circuit, while PWM / IGBT protection maximizes their performance in the frequency inverter output circuit. A purer voltage to both the frequency inverter and the motor means:
  • Improved frequency inverter System Reliabilityline / load reactor
  • Reduced frequency inverter System Downtime
  • Improved True Power Factor
  • Virtual Elimination of Inverter Nuisance Tripping
  • Attenuation of Input Current Harmonics
  • Extended Motor Life
  • Reduced Motor Peak Voltage
  • Reduced Motor dv/dt Spikes
  • Reduced Motor Temperature
  • Reduced Motor Noise

Difference between "line" and "load" reactors:


Line reactors are used the "line side" or input of an inverter (i.e. where three phase voltage comes into the frequency inverter). The following schematic shows a line-reactor installation in a frequency inverter system:

line reactor installation in frequency inverter

Load reactors are used on the "load" side of inverter (between the frequency inverter and the motor). Load reactors are a new, more effective reactor technology and are ideal for harmonic compensation. The following schematic shows a load reactor installation in a frequency inverter system:

load reactor installation in frequency inverter

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