How does that work exactly?
Rick
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11 years ago
Analog dynamic range, accuracy and number of bits
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11 years ago
At the old house (1969-1994) I had a (underground) neutral go resistive. Furnace blower would come on and half the lights in the house would dim, half would brighten.
I called APS and the token dumb blond lipped me.
I returned the compliment ;-) Which got me in direct touch with an engineer.
They had a temporary (above-ground) neutral installed within the hour... a cable about as thick as my wrist ;-) ...Jim Thompson
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I love to cook with wine. Sometimes I even put it in the food.
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11 years ago
Magik?
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11 years ago
On 11/14/2012 4:39 PM, rickman wrote: My house *still* has the same disk meter
Probably because they work so well.
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11 years ago
I do hope you are writing "a cable about as thick as my wrist" as an embellishment. If so, I can deal with that.
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11 years ago
OTOH, maybe you have a really tiny wrist. I didn't consider that.
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11 years ago
the
Yes. Correct description of the situation is crucial to understanding what is correct or incorrect operation.
applies.
That depends a lot on how the rectifier is connected and just what is connected for legs. If the rectifier is across 240 from a 120/240 system no neutral current (harmonic or otherwise) flows; very different from
3-phase systems.
?-)
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11 years ago
such
It has been a long time since i saw normal equipment using a half-wave rectifier. That pretty well went out with 5 tube radios. I don't think i have ever seen it from each line directly, always a transformer in-between.
?-)
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11 years ago
meter
athe
is
Not in initial cost, though that may change in time. It is total cost of over the lifetime, including things like paying for meter readers.
Not only that it likely can support co-generation if it is of better grade (can run backwards to reflect your co-generation power) IFF tariffed at the same rate.
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11 years ago
The problem is that the PFC requirements apply only for large (over 70 W in Europe IIRC) but there are millions and millions of small CFL and LED lights that are not required to include PFC, all drawing current only at the top of the waveform.
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11 years ago
It's common to use a diode as a two-step incandescent dimmer or hi/lo heater controller. I've always wondered what a DC line current component would do to an electric meter... maybe slow the disk on mechanical ones, saturate a CT?
-- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
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11 years ago
Add corrosion to earth points due to DC component running to ground.
Grant.
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11 years ago
Well, that's why I said *may*. Figuring out for which conditions this is actually true is left as an exercise for the assiduous student.
Jeroen Belleman
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11 years ago
In Europe, tube TV sets were equipped with PY series half wave rectifiers (later selenium/silicon) in order to produce about +200 V anode voltage.
With the quite large distribution districts (400-1000 m) from the distribution transformer, it was quite likely that about 50 % of the TV sets were plugged one way, while the other 50 % were plugged in the opposite way, so there was not a large risk to a DC bias or second harmonics problem.
While I have personally experimented with a rectifier as power control, I have never heard of any commercial product (in Europe) doing this (more likely various serial/parallel systems).