Do you have any links for information along those line? . I never worked on
"rotating capacitors" for power factor correction usage and would find that
interesting . Mostly I worked with smaller motors under 5HP, transformers
and transmission lines and communication stuff. The few PH correction
capacitors we had were static units under 60 MVARs and I would think the
protection circuits would be simpler.


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"jk" wrote in message ...
Not true, or only a little so.
A 3 Ph induction motor WILL output power to the grid, WHEN RUN OVER
SYNCHRONOUS SPEED. THis is NOT a rotating capacitor! It will still be
"consuming" reactive power (vars) just like it was when running as a
motor. This is an induction generator. THey are commonly found in wind
turbines, and pumped storage systems.

A rotating condenser (capacitor) is a SYNCHRONOUS motor that is
excited past unity power factor on it's field winding. [i.e. more
excitation than needed when running as a motor] it is rotating at
exactly synchronous speed. Attempt to rotate it faster (by sticking a
primer mover on it) and you have a generator. Put a load on the shaft
and you have a motor.



"Josepi" wrote:
This is nicknamed "rotating capacitor" by some electric utilities and used
to correct power factor on lines and systems.