I am interested in three tests used on the insulation systems; both stator and rotor windings. These test are the Poalrization Index, Dielectric Discharge and Step Voltage. I have used PI testing on my generators forever and am considering adding both Dielectric Discharge and Step Voltage to...
What is the typical setpoint and basis for unbalance protection on an induction motor. Specifically, magnitude differences between the 3 phase currents, negative sequence current and negative sequence voltage.
Background - Induction generator when fully loaded trips off due to current...
Two flanges bolt together with an electrical insulating gasket between them. A bolt from the outside of the 'vessel' hold the inner piece to the outer piece. The bolt hole is electrical insulated by a washer and nonconducting tube.
The bolt head is at air atmophere pressure. The insulated...
A 3-phase induction generator has balanced terminal voltages but an unbalance in the currents. One phase current is about 25% lower than the other two. Voltages are balanced to the low-side of the step-up transformer.
What can cause this and what tests (simple) can be performed to find out...
