Re: [TCML] pole pig protection

[FIFTYGUY@xxxxxxx]

In a message dated 9/10/08 8:04:11 P.M. Eastern Daylight Time,  
FIFTYGUY@xxxxxxx writes:

>    A common example of this is the failure of AC   industrial motors when 
run 

>from inverters. Insulation stress from dV/dt is  highest at  the first few 

>turns of the windings, and this is where the motors   characteristically 
fail.


    I'd like to add that a common solution, or at least  good engineering 
practice, is to install a "load reactor" between the inverter  and the motor. 
Again, just a choke, but it mitigates dV/dt stress and does a  number of other 
handy protective functions as well. And a lot cheaper and easier  to replace 
than a motor... 
 
-Phil LaBudde

Center for the Advanced Study of Ballistic  Improbabilities



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