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Re: [TCML] Terry filters
Hi Neal,
Yes, there are losses with a Terry Filter. It is a trade off for
protection. It is also specific to center grounded transformers
primarily NST's due to their fragility. It is a one size fits all for
NST's for most of the components except the MOV's. When were using
MOT's, PT's, PIGs, etc.. there is no such filter added other than basic
mains filtering. Terry Filters are not a big loss, but there is some.
The problem is that NST's can't handle to much voltage over their
ratings (were using NST's for something quite different then they were
designed). Most NST deaths are due to one of the secondary windings
being over-volted near the outer turns. NST's are also a pain in the but
to fix due to the potting compound. So a little protection does help
even with some minor filter losses.
Take care,
Bart
Neal Namowicz wrote:
Hello everyone,
Just a question about terry filters, since the topic seems to be
cropping up a lot lately. How much loss is there when using them? I'm
no EE, but any time I see the main power coming in going through
resistors, there must be some loss. Also, are the TF's "one size fits
all", or can the components be sized to correspond with how much
potential power you have coming in? It seems that we endeavor to
eliminate "lossy" components. "Using beer bottle caps? Replace them
with an MMC." Don't use a dimmer switch, too "lossy", etc. Ultimately,
is using a TF a trade-off between loss and protection? Kind of like
driving a newer car that comes with a mandatory explosive device (air
bag) in the steering wheel. "But it's for your protection!" Just one
of a number of reasons my two vehicles are 1964 and 1980 Chevys. The
k.i.s.s. principle, and no bombs staring me in the face. But I
digress, sorry. So, what do you think about the terry filters?
Neal.
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