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overspeed limit for hydro generators

overspeed limit for hydro generators

overspeed limit for hydro generators

(OP)
For a pelton wheel hydro generator, what is the speed limit to be set on mechanical and electrical overspeed protection ? What is the applicable standard ?

RE: overspeed limit for hydro generators

Doesn't it totally depend on the size of the wheel?
Are you talking a 6 inch one or a 6 foot one?

RE: overspeed limit for hydro generators

(OP)
I didn't know the limit depended on the size.

The machine is 25 MW, 14 pole, 428 RPM with a 60 ton generator rotor and 15 ton turbine pelton runner

RE: overspeed limit for hydro generators

In Hydro turbines, the runaway speeds are generally high, of the order of 180% for a 30MW Pelton turbine with 600rpm rated speed (typical).

The governor is expected to limit the speed rise on full load rejection to 110%. Hence, the trip setting for overspeed can be set to 110%, I think. Electrical overspeed setting is normally kept a little lower than the mechanical overspeed setting, say 108%, normally.

RE: overspeed limit for hydro generators

(OP)
Thx Ragunath. That was the info I was looking for. Is there any standard that specifies this ?

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