Re: [TCML] pole pig protection

[FIFTYGUY@xxxxxxx]

In a message dated 9/10/08 2:15:29 P.M. Eastern Daylight Time,  
bert.hickman@xxxxxxxxxx writes:

>If you apply a voltage step function to the output of a large ideal  

>lumped inductor, the resulting current will simply gradually  increase 

>over time. However, if you do the same test using a real multilayer  HV 

>winding, you'll see the current immediately jumps during the step  

>transition due to the combination of winding inductances and  

>interwinding capacitances. The instantaneous voltage distribution  will 

>actually be governed more by the distribution of capacitances  within the 

>winding than by the inductances.


    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.
 
-Phil LaBudde

Center for the Advanced Study of Ballistic  Improbabilities



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