General > General Technical Chat
HV Transformer dude almost terminating himself and the house cat!
coppercone2:
--- Quote from: PartialDischarge on February 16, 2024, 03:54:11 pm ---
--- Quote from: coppercone2 on February 16, 2024, 08:08:15 am ---maybe stick to oil filled basins rather then trying to use sealed tactical crap
IMO he is a victim of 'OIL BAD' 'POTTING GOOD' mentality.
You need to realize just because they made something that can be thrown into a wet damp manhole tunnel and installed by underpaid tossers (like literarly they will toss it) with zero plans for maintence does not make it good lab equipment as cool as it looks. Half this stuff is designed the way it is because its meant to be installed by the least possibly skilled worker in the fastest amount of time possible with zero maintence cost (and if you prevent maintence and require replacement then you gain money). it can be often done in a slightly more complicated way that requires some skills but brings major benefits to repairability and lack of explosions.
--- End quote ---
I cannot believe what you are saying. You simply don't know what that transformer is and what happened.
1) What happened is that this wannabe electrician connected the secondary as primary and overdrove it *continuously" by probably a factor of x5 over the nominal. Now let's change the whole industry and the standards so people like this don't get hurt LOL.
2) That transformer is made for measurements not for energy transmission. They are designed for low burden. They do not need heat dissipation. Epoxy is the most reliable, 0 maintenance, long lifetime solution. They can be installed horizontal or vertical. They are installed by the tens of thousands in medium voltage switchgear to measure voltage (along others to measure current).
Oil transformers have problems like risk of fires, humidity getting inside and can't be installed horizontally.
I'm just scratching the surface
--- Quote ---And also that thing I bet was designed with the idea that its likely to go off in a isolated tunnel where no one is allowed to be if it is powered.
--- End quote ---
It is designed to be used with a fuse in the HV primary, so the secondary or primary never develop high pressures inside. Even if no fuses are used these transformers are very safe.
Phase-Phase instrument transformers are designed to withstand 20% more of the nominal continuously.
Even more, because a 3-phase system can have a ground fault and have ground shifted to a phase, phase-neutral instrument transformers could see the voltage increased by sqrt(3), so they are designed to withstand 90% more voltage as standard (thus the rating 1.9xUn/8h seen in many of these transformers)
In short: There is a lot of science and human thinking as to the why of these casted transformers, and there is 0 science and human thinking in what that "Youtuber" did
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Why would I care about the industry selling potted crap. What I am saying is that being around a sealed transformer is convenient (for those scared of oil) but not safe. Big pressure vessels can go boom. The youtube comments were like "I never go past 200% overload". Hardly wisdom. Try never going above overload on a big sealed component. I see a buncha ghetto ass DIY guessing at a SOA curve with alot of figuring and ass scratching thrown in (construction worker shit). It looks like no one in the community actually uses the fucking thing to spec.
I thought it was a transformer to conveniently power telemetry electronics off a hV line. If its a pure instrumentation transformer then any impedance less then 100kOhm = fail. Then its just 100% misuse.
If its made for measurement then the load should never be anything that arcs too.
Bud:
Was it necessary to show his bleeding nose to the World? Fucking moron, they do everything to extract an extra buck.
tooki:
--- Quote from: coppercone2 on February 16, 2024, 08:08:15 am ---if you see how they do some hv transformers its in a big bin of oil with a lid that opens up on a hinge and its not really pressure sealed, just has a gasket around it that is sealed with the weight of the lid. I saw this before in rf transmitter. Nice way to manage pressure.
maybe stick to oil filled basins rather then trying to use sealed tactical crap
IMO he is a victim of 'OIL BAD' 'POTTING GOOD' mentality.
--- End quote ---
Nah, he’s got other videos showing his oil-filled transformers, including performing maintenance on them in his bedroom. I’m sure his mom is delighted to clean transformer oil out of the carpet… 😂
coppercone2:
probobly should stick to those because they might damage the ceiling but it won't throw big heavy chunks of dense plastic at you easily
granted that is only if you have a functional over temperature shutoff for the oil
shapirus:
--- Quote from: Psi on February 12, 2024, 11:18:13 am ---meh, everyone does stupid things when young and when starting something new.
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Yeah, but those on the smarter side tend to take some safety precautions. For example, when I was, I guess, 8 or 9, I asked my father: what will happen if you stick tweezers into the wall outlet? He replied: "a short". Well, as you can imagine, that's not the explanation you want to give to an inquisitive kid. Of course I wasn't satisfied and went on testing it myself. But I did know very well that electricity may be dangerous, so I used pliers with insulated handles (1000V rated -- and I did pay attention that this was well above the 220V mains voltage) to hold the tweezers. The fuses at that time were actual fuses -- a piece of wire that melts at a high enough current -- so there was enough time for the experiment to produce quite a spectacular bang before the fuse did its job.
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