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Re: [TCML] Terry filters
On Dec 30, 2007, at 12:15 AM, 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.
power dissipated in a resistor = the square of the current X resistance
So, for a TF with 1kΩ resistors, and a 15kV / 30 ma NST short-
circuited by the spark gap, we dissipate 0.9 watts in the resistors,
or 0.2% of the transformer's power.
With a 15kV / 120mA NST driving a short through the filter, we
dissipate 14 watts, or 0.8% of the transformer's maximum power.
(somebody check my math, I'm still waking up this morning)
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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