I work at an old mining installation that uses reactors on the star point of all underground transformers to limit earth fault currents. Why use a reactor instead of resistors? I would have thought reactors would create problems with transients/harmonics during earth fault protection switching...
I'm having some problems with 2 speed consequent pole constant torque motors dying from earth faults. They are rated at 12.5/25HP, from memory 15A FLC. They are on brand new shuttle cars, which are used in underground coal mining,
and nearly identical to other cars on site.
The only differrence...
