breaking of synchonous generator
breaking of synchonous generator
(OP)
How is it possible to break (slow down) a synchronous generator ones he is not any longer connected to the grid? Why do some power plants have a possibility to break the synchronous generator and other don't?






RE: breaking of synchonous generator
A mechanical brake could be used, but braking a large turbine-generator would generate a lot of heat. It will generally stop on its own (eventually).
RE: breaking of synchonous generator
Some alternators will not be lubricated properly if they are left to coast for too long. Such machines will have brakes to stop them fairly quickly.
Some hydro powered machines are allowed to coast down to a fairly slow speed before the brakes are applied.
Another issue is small water leaks through the water control valve. This may cause the turbine/generator to revolve slowly without proper lubrication. The brake prevents the machine from turning slowly.
Bill
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"Why not the best?"
Jimmy Carter
RE: breaking of synchonous generator
Somer I saw had a twin shaft gas turbine, and had a brake on the turbine side to prevent the power turbine windmilling due to oil drag across the clutch. These were only used at standstill, not to actually slow anything down.
RE: breaking of synchonous generator
RE: breaking of synchonous generator
RE: breaking of synchonous generator
The brakes also serves as jacks during maintenance.