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Three-Phase posted:(I'm not sure of the difference between using GPS and, say, using an atomic clock signal.) GPS is a pretty convenient atomic clock signal I guess.
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Sep 10, 2011 05:42
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Three-Phase posted:I know people have clocks and watches that use a central atomic clock signal, but doesn't that just fire a "reset" signal once a day at a very specific time? Yeah it does something like that.
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Sep 10, 2011 06:05
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The Proc posted:230 delta vs 208 wye: What are the pros and cons of each and how do you decide which is better for a particular installation? Also, what is the difference? I've heard of it but never got a good explanation.
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Sep 13, 2011 18:28
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Sweet, thanks movax.
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Sep 14, 2011 04:03
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Where is this hydrogen coming from?
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Sep 18, 2011 00:29
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ANIME AKBAR posted:Obviously brushed motors are worse since they produce sparks all the time, but in a high power induction motor I can't imagine how they suppress ignition reliably. By keeping oxygen out. quote:edit: also I know that hydrogen has great specific heat, but specific heat is joules per mass, not per volume. Is it really better than water then, when you consider that water is much denser even at high pressures? Apparently the viscosity of water can be a problem around moving parts.
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Sep 19, 2011 05:28
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Nerobro posted:And it's conductivity.... When conductivity is the problem I think they use mineral oil.
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Sep 19, 2011 08:59
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McJuicy posted:I get that conductors have expanding and collapsing magnetic fields but I don't truly understand how a hot and a neutral can "cancel each other out" magnetically as to not heat up a conduit and not being able to hook an ammeter around both conductors. Can you explain this concept? Another way of explaining this is that the flux is the total current crossing through a surface. In this case the surface is the cross section of the conduit or the loop of the ammeter. Your hot and neutral are carrying equal currents through this surface in opposite directions so they cancel out.
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Feb 7, 2012 04:16
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ncumbered_by_idgits posted:My power was out from abuot 1:45-2:15 cst yesterday. The answer may lie in the last five posts in this very thread. Rolling blackouts.
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Jul 18, 2012 23:32
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Three-Phase posted:One of my co-workers said awhile back when there were really bad storms, he saw a convoy of a dozen utility trucks heading down the highway to the affected areas. That's nothing--I was in Carbondale, IL for this storm and they literally filled the dorms and the mall with linemen. There were 1,000 of them or something crazy like that, and they took a week to restore power. It was a sight to see, big parking lots full of the utility trucks--and orchard trucks that they used as utility trucks.
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Jul 27, 2012 13:10
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In surgical operating rooms I see "isolation panels" that read out "hazard current" up to 10ma, and most of the outlets throughout the room are connected to it. What is this?
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Oct 26, 2012 02:49
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That reminded me of this video of a crane dropping an MRI machine: https://www.youtube.com/watch?v=ABkjwRQ1ByI
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Jul 5, 2013 20:48
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Frozen Horse posted:The magnet itself consumes only cryogens once it's powered up. Doesn't it stay powered up all the time?
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Jul 8, 2013 22:34
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What is a semiconducting strand screen?
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Jul 12, 2013 20:56
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grover posted:I bolded the important bit. I think the problem is that caution tape applies to other people, laymen, not trained professionals who often set up their own caution tape. I widely ignore the tape, too. Use red danger tape for the latter? http://safetywiki.pppl.wikispaces.net/Barricade+Tape
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Jul 19, 2013 17:58
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I just toured a supercomputer and got to see the power and cooling stuff too. The capacity of the building is 24 megawatts. Crazy stuff.
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Oct 16, 2013 00:19
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grover posted:My favorite, though, are superconducting electromagnetic energy storage. Literally a coil of superconducting wire sitting in a tank of cryogenic helium that can dump out a SHITLOAD of power in a fraction of a second. This is a really interesting idea--haven't heard of it before. I work in a research MRI lab and was just thinking about how much energy might be stored. Do you have any interesting references off hand?
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Oct 16, 2013 23:18
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some texas redneck posted:A couple of years ago, I was living in university housing. There was a decent storm, and I noticed that there was a lot of arcing at a nearby power pole at the disconnects (basically about 100 ft from my car If only there were a three-digit number you could call to report any type of emergency... angryrobots posted:but I think the conductor for the circuit around the eaves of the home (Romex I'm assuming) would not fail that spectacularly unless exposed to much higher than 600v. Was there necessarily a circuit there? Or could it have been gutters or metal paneling or something?
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Sep 14, 2014 23:06
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and juuuust off of university property), along with my own lights flickering pretty badly (went off a couple of times, then came back on).