The variable speed drive (VSD) has been around for many years. There are many different sizes and brands of VSD's in use today. A
VSD is a computer driven device that has the ability to vary the RPM of the down hole submersible pump by increasing or decreasing
the frequency (Hz) of the power to the motor.
There are several ways VSD's enhance the performance of electrical submersible pumping
1.The operating range of the pump can be increased and decreased.
2.The ability of the pump to handle gas.
3.The ability to
test an individual well's productivity.
4.Soft start effect.
6.Convert single phase to three phase (Phase Converter).
8.Protection from electrical transients.
9.Reduced power requirements on start ups.
10. Longer run times on the pumps section.
speed drives perform other functions other than enhancing submersible pump systems.
1.Enhance pump jack performance, increase and decrease
2.Control water levels and pressures in water floods (SWD Pumps).