[time-nuts] Three Phase Power

Will Matney xformer at citynet.net
Mon Jun 27 21:39:41 UTC 2011


It wasn't Analog Devices, like I thought, but Teridian Semi, and division
of Maxim, who makes the chips. The part number in question was a 71M6511.
The app note is 4889.pdf from Maxim.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 6/27/2011 at 5:03 PM Will Matney wrote:

>Jason,
>
>I've read some about the new meters, but AEP hasn't touched any of
>ours...yet. They have demand monitoring here too, and you are correct, it
>can really rack up a power bill. A good friend that owns a machine shop
>watches his all the time. Once you get three phase power, the costs
>skyrocket, as they bill you for all kinds of things. That was why I made
>the decision of using a phase converter that time, and buying all of my
>machinery with 230 Vac motors, though some were dual voltage.
>
>Without really setting down and looking at the circuitry on the new
meters,
>its hard to say what might happen, as I was speculating earlier. The last
>PDF I read, was about the circuits they added to stop folks from bypassing
>them, or stealing the electricity. I think that it was Analog Devices who
>were making the IC's for these, but I may be wrong. There was 2-3 app
notes
>I read, as I was interested in seeing how they did it.
>
>You are also right, in that they will do away with the meter readers. If I
>recall, I read that they use a radio link to send the info back to the
>office, or something similar.
>
>Best,
>
>Will
>
>*********** REPLY SEPARATOR  ***********
>
>On 6/27/2011 at 3:38 PM Jason Rabel wrote:
>
>>Will & Bill,
>>
>>Our (commercial) three phase power is fed by only two high-voltage wires
>(7,200v I think) which each pole has a pair of
>>transformers. I can only assume one generates the 220v single phase lines
>and the other is the high-leg delta. Around here 230v
>>three phase delta seems to be more common than 208v Y style.
>>
>>I remember a couple years ago we had a transformer die (thankfully it was
>a passive failure and not a massive fireball on the pole).
>>People were wondering why their machines weren't working (but the lights
>were on)... Sure enough hooking up a meter and the high leg
>>was dead...
>>
>>I did read somewhere that this change might have an effect on demand
>meters? There was no further explanation unfortunately, but
>>that does kind of worry me as I know about 90% of the meters on our
>property are that style. The power company just loves to tack on
>>a "demand charge" to the bill, which can often double, or triple the cost
>of your electric... Just because you want to have the
>>lights on, A/C running, and an air-compressor... :(
>>
>>I've never seen or heard of anyone here in Houston with three phase
>residential (except for farmers, but I guess they are
>>commercial).
>>
>>Centerpoint Energy has reached the epitome of laziness and is converting
>everyone over to "smart meters" so people can better
>>monitor their usage... In reality it does nothing more than offer
>real-time monitoring for the power company, and they no longer
>>have a use for meter-readers...
>>
>>
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