RE: [TCML] MMC Caps

["Terry Oxandale" <Toxandale@xxxxxxx>]

It sounds to me from looking at various applications (as well as my own)
that it really boils down to a fairly consistent cost/uF. It can be an
MMC, or several larger caps in an arrangement, or one large cap. My MMC
cap used 48 caps of the "sale" GE snubbers which gave me .032 uF/36 KVAC
for about $120. I changed to the 37667 for roughly the same values (.030
uF/35 KVAC), for about the same price. Neither have ever failed. 

It's when the builder, faced with an "economic" decision decides to cut
corners, that the "economic" decision turns out to be not so economic
after all. I recently felt compelled to double up (actually, quadruple
them in order to get the same net capacitance value) on the 37667 caps
so that I wouldn't stress them as much in the hopes that I never need to
replace one.

Terry



-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Mddeming@xxxxxxx
Sent: Wednesday, December 12, 2007 11:43 AM
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] MMC Caps

 
In a message dated 12/12/07 10:40:48 A.M. Eastern Standard Time,  
mark_w_stolz@xxxxxxxxxxx writes:

We used  a .130 uF MMC on a 10kVA pole pig system built for a client,
and he 
has been  running it for a couple years now without problem.  13 strings
total 
 strings, with 15 of the CDE .15 @ 2kVDC caps per string.

Mark  Stolz



Hi Mark, All, 
 
    I think this is exactly the point Dr. R was trying  to make: When
you 
need $600+ worth MMC of caps plus the time and labor to  assemble them
into an 
array, it starts to become more time, size, weight, and  cost effective
to 
consider Maxwell-type caps. Replacing a cap or two in your own  system
is an 
inexpensive repair, but if it involves making service  calls to another
location, 
the cost advantage may quickly disappear.
 
Matt D.



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