Short circuit limiters are installed in series at the power line and serve to reduce the short circuit currents. The current reduction can also occur for other reasons, such as sarting up electric motors or severe inductive machines.
The main advantage of this type of reactor is that you can installing circuit breakers with lower breakdown current, then less expensive.
Another advantage of these reactors is not having a ferromagnetic core which, by its nature, is subject to losses, reduced operating frequencies, noise and saturation possibilities. The air core excludes all these problems then it allow these reactors to be used even in highly distorted waveforms (high THD).
Type= Three-phase short circuit limiting air core reactor
Qn = 7.5 kVAR
Ln/phase = 0.6 mH
In = 115 A
Frequency = 50 Hz
Insulation class = 12 kV
Cooling = Air Natural
Ambient Temperature = 40 °C
Other uses of this type of reactors can be:
- Filter reactor (harmonic filter, associated with capacitors)
- Damping reactor (to limit the insertion transients)
- Leveling reactor (reactors used to reduce/eliminate harmonic after AD/DC converters)
To complete the installation package it is possible to introduce in the circuit a central magnetic shunt that can reduce the dimensions of the air reactor, maintaining the performances for frequencies close to the mains one.