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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