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 Parabola37 (Electrical) 8 Nov 06 9:39
 I have a question that I get all different answers for.Here it is:   Steam driven generators.I completely understand the concept of what happens when you admit more steam to produce load.(Control valves open wider etc....)The turbine is locked in at 3600 rpm from the grid.What actually happens that the generator produces more load? Is it that the field gets stronger and produces more resistance?Does the phase angle change?
 abeltio (Mechanical) 8 Nov 06 14:58
 (6)  ScottyUK (Electrical) 9 Nov 06 5:07
 Think of the generator and grid as being locked together as they rotate. When the generator is delivering power it is trying to accelerate and the grid provides a restraining torque. I've used the following analogy: it isn't perfect but it is easy to visualise. Consider the grid and the generator as two rotating shafts having a mechanical coupling which comprises of two rotating discs linked by rubber band. The rubber band represents the magnetic field of the rotor. When the generator load is increased the rubber band stretches and the generator pulls slightly ahead in phase relative to the grid. This phase angle represents the load angle of the generator. If the generator delivers too much torque the rubber band will break, which equates to the generator breaking synch with the grid. In the event of the generator's prime mover failing the generator will adopt a negative load angle and the generator will slip in phase so it lags behind the grid in phase and the rubber band is taut once again.Hope this helps a little. ----------------------------------  Sometimes I only open my mouth to swap feet...
 waross (Electrical) 4 Dec 06 8:53
 We answered a similar question regarding wind generation.You may wish to look at thread238-171826respectfully

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