Input Line Reactor
Input Line Reactor
(OP)
hi
can anyone explain me what are input line reactors and when are they used?
Thanks,
lukin1977
can anyone explain me what are input line reactors and when are they used?
Thanks,
lukin1977
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RE: Input Line Reactor
They function as high frequency filters blocking high frequency harmonics from the drive going backward into the power network and also blocking high frequency noise in the power network from getting into the drive.
There's lots more detail about these. You should do a search on this forum for good reference material.
RE: Input Line Reactor
I am doing the search right now
One question: The reactors affect the power factor making it more inductive?
lukin1977
RE: Input Line Reactor
Under fault conditions the reactance predominates and the current becomes highly reactive. A transformer has similar characteristics, so adding an inductor to a transformer makes little change to phase angles but does lower the available fault current.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Input Line Reactor
An inductor presents a high impedance to high frequencies. So, a line reactor can help filter high frequency voltage transients from the supply, giving some extra transient protection to the VFD.
RE: Input Line Reactor
These reactors also serve to protect the storage capacitors from over-voltage due to line spikes and transients. Note that these will be rectified regardless of where they appear on a phase voltage waveform.
More info. is here:
http://mtecorp.com/
http://transcoil.com/display/router.aspx
These are typically three coil units with six leads.
A D.C. link reactor can also help do both jobs (reduce harmonic currents and reduce effects of transients, spikes and surges). The above links also have info on D.c. link reactors. These have two coils; but be careful in sizing wiring conductors since these handle the entire power flowing thru the VFD to the motor.
Hope this helps.
Regards . . .
Jim S. Nasb