Re: Line Conditioner to Protect Electronics
By Will Dahlgren
Robbie comments about frequency tolerances for transformer type line conditioners:
> The ordinary transformer doesn't offer the protection that the resonant
> line conditioner provides. The two types are often installed together,
> however. The line conditioner is usually rated for +/- 5% change in
> mains frequency, or +/- 3 Hz at 60 Hz. -- Robbie >>
If I remember correctly, one of the original thread questions related a local grid be disconnected from the mains and then motors, etc. dumping high voltage into said local grid. This is not my area, but, I doubt we would see anything like a stable 60 Hz frequency under these circumstances.
Will Dahlgren
[ That's true, and the line conditioner is designed to deal with this
[ condition also. The ANSI/IEEE C62.41 specification has a gruesome test
[ for 120-volt equipment: 390 vdc is suddenly added to the ac at the
[ crest of the sine wave (170 v), making it 560 volts! The dc voltage
[ then decays exponentially over one cycle (16 msec). One of the two
[ transformers in the line conditioner unit simply saturates during this
[ event, safely absorbing the surge. The other transformer is the
[ inductor of 60-Hz resonant "flywheel" circuit, and it provides
[ additional suppresion of the transient pulse. -- Robbie
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(Message sent Sun 12 Jan 1997, 20:05:49 GMT, from time zone GMT-0500.) |
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