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  #16 (permalink)  
Old 09-07-2002, 12:32 AM
4 Jaw Chuck's Avatar
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Autorewire, so this explains why the car will continue running/charging if the battery is disconnected? Because the field is already excited it will continue to excite until the field is removed by shutting down, is this correct? This interests me mainly because we used to have to jump the turbines with a 12 volt battery at the hydroelectric facility I used to be a lead mechanic for. I was told that the field needed a small voltage current to start the field and get the "electrons" moving before the field would self excite. These 6 Megawatt turbines were nothing more than large alternators just like an automobiles, only three phase power was produced and rectification was done down stream from the plant inside the city limits for efficiency.

It seemed that self excitation would occur after a restart as long as the shut down time was short (at most a couple of weeks but varied from turbine to turbine) but after extended shutdowns (a few months) they would need a jump to get them going again. I found it funny to watch two electricians drag a twelve volt battery over to a 100 000 HP alternator and touch the excitor bus with some jumper cables to get her alternating again.

The explanation I got was that if the turbine was restarted soon after shutdown the electron transfer flow would continue even without a field but would eventually stop due to eddy drag losses in the copper conductors, of course with so much copper this could continue for some time but once it stopped an external "boost" was needed to restart the flow again due to the inertia effects of all that material mass. Is that a correct explanation or were those power electricians just pulling old chucky's leg again? They seemed to know what they were doing and it sort of makes sense?

I would value your opinion.

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  #17 (permalink)  
Old 09-08-2002, 12:02 AM
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Hey Chuck,

The answer to both of your questions is yes.

You are right on about the electron flow. That is exactly what is happening in an automotive alternator.

al
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