V-t Curve
V-t Curve
(OP)
To set up a system, I need to know for a 100 HP and 200 HP ,600V induction motors , how long it takes after the main supply power is disconnected , the residual voltage on motor leads to drop to 25% of its rated voltage.
assume load is 100 %.
Thanks
assume load is 100 %.
Thanks





RE: V-t Curve
RE: V-t Curve
V = N * K * Phi
Phi decays according to the open circuit time constant - can be determined from the motor parameters. Can also be estimated from motor nameplate data (post everything you've got and I'll do it if you want).
N decays according to system inertia etc.
For a conservatively high analysis, ignore N and focus on the decay of Phi.
I agree 100% that measurement is almost always better than calculation. But in absence of measurement, we can still make a pretty good guess.
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