Re: [TCML] Terry Filter Caps

[FIFTYGUY@xxxxxxx]

In a message dated 8/24/08 11:39:19 P.M. Eastern Daylight Time,  
bartb@xxxxxxxxxxxxxxxx writes:

>Hi Adam,



Where was "Adam" in this part of the  discussion?
 
>Did I get this right? Are you running a Terry Filter with a  pig?
>Just curious about that. I personally don't use such a filter with a  pig 

>transformer. Only for NST's. Not that it hurts, but I'm not sure it's  

>necessary. NST's are voltage fragile. Transients are part of that.  The 

>filter helps some in that department.


Bart, I just sent this post out:
 
_http://www.pupman.com/listarchives/2008/Aug/msg00413.html_ 
(http://www.pupman.com/listarchives/2008/Aug/msg00413.html) 
 
    I was surprised nobody commented at the time...  but it's in the 
archives, so I know ya'll got it!

>Regardless, in this discussion, people should remember the MOV's  across 

>each cap/resistor circuit within the Terry filter. As long as the cap  is 

>of adequate voltage and the MOV's are designed for the "transformer",  

>then there is plenty of protection across each individual RC section  

>(beyond the cap or resistor ratings). But with a good design, those  are 

>last resort.



    Yeah, and the MOV's are slow to respond to  transients at 1 MHz. But they 
certainly are nice to have! 
    Some distribution arrestors use "combined  technology" with a spark gap 
in series with the MOV element, just to complicate  things. I think the big one 
I've got sitting around is like that, since the last  time I tried it across 
my pig on an untuned coil, hot metal sparks actually shot  out of it and 
rolled on the ground.... The two arrestors on my pig have done  just fine at 
15+kVA, even when the safety gap has been firing. I feel I've got  that safety gap 
set pretty tight, but my arrestors are as tight on the MCOV  specs as I dare go 
(even tighter than the specs for the "usual NST" Terry  Filter).
 
-Phil LaBudde
Center for the Advanced Study of Ballistic  Improbabilities



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