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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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