720V Arc Flash on UPS Batteries - Short Circuit

[@MrTheog1989]

This is exactly the type of content I was hoping for!

[@davidb1412]

Arc flash is one of the scariest things ever. The plasma it produces can easily exceed 50 thousand degrees Fahrenheit. It will instantly incinerate clothing, cause fasteners on garments to explode, and flash boil liquids. The only saving grace, is it doesn't hurt for long. Wowza.

[@stevegraham3817]

It will flash boil the metal into a vapour as well. There is not a lot of things like 50,000degF copper fumes going to the depths of your lungs to ruin your remaining days on the planet.

[@ketas]

good: it will not hurt much bad: there is no life left in you

[@crazychickpug]

you should film them in slow mo too, that would look nice

[@manickbarry]

Get the slowmo guys in on it 😂

[@douglasashby4349]

Maybe do these experiments outside?

[@merlin5476]

I should imagine the current would be phenomenal if connected in parallel.

[@filenotfound__3871]

Thats sick. Now try powerimg a few 220v appliences and lightbulbs with it.

[@ExperimentalHV]

Like a vacuum cleaner?! 😁

[@PedatorOhneR]

@@ExperimentalHV the vacuum cleaner turn into a black hole :D

[@filenotfound__3871]

@@ExperimentalHV Vacuum cleaner overclocking lol. Whatever you find should be fun.

[@deltab9768]

Is the circuit breaker tripping at the end of each arc, or is the arc extinguishing itself? What was the farthest gap that the arc was able to start across? Also, where did you get so many batteries?

[@LawpickingLocksmith]

pity we never got to see the amp readings. A pyro fuse got to deal with this.

[@ExperimentalHV]

@@LawpickingLocksmith The meter unfortunately is a bit a slow, however I caught it sitting at 318A on a long arc.

[@ExperimentalHV]

Part 1 of our 2000v battery setup is live. These arc flashes are something else! kzbin.info/www/bejne/jXaXlWmVfq6MZ5osi=J4Q-ZQJd4VHSbyEZ

[@vicentecarrasco3653]

what happen if you connect a low voltage dc devices with 720？

[@Strusiowy]

Hi, i have in my device 36 in series AGM type battieries and voltage is aroung 460V. The problem i was had fiew times, one of the battierie was start smoke and burn around (-) connetor. I have no idea why, now during the replacement i always replace a check by tester all of them and also i always ceeping them charged befor first run and puting inside batteries with very similiar voltage, but problem come back, one of the battery wwas completetly burned down, im start to thinging its a quality issue.

[@stevegraham3817]

The internals of a lead acid battery are designed for around 100v or so, which is why you don't see too many set ups over 48v. Even if they are designed for 500v, it won't take much resistance to create a nice heater inside.

[@ExperimentalHV]

Depending on whether you are talking about a spade connector or bolt connection. Ensure the connection is tight, loose connections will cause a fire/ melt the terminal. Next is corrosion, if they are poor quality batteries they can leak around the terminal and cause a bad connection. Even with good quality batteries this is seen occasionally. Hence the maintenance/ inspections required. Thirdly use a good name brand depending on your countries availability E.g Vision, Datasafe, CSB etc. poor quality batteries won’t be able to handle being linked up in series to 432v nominal, this is mainly due to the casing suffering a break down to the metal frame they usually sit on. Also poor quality batteries don’t last long at all e.g 2 years. Ensure all the batteries are of the same or similar date code or this could cause the whole string of batteries to require replacement. The float voltage should be within the manufacturers tolerance e.g the batts in the video will sit at 13.5v each at 22c. Lastly ensure the batteries are in a cool environment 20-22c and that they aren’t used longer than the battery manufacturers design life. Or you will end up with a thermal runaway / fire. The batteries in my video won’t last longer than 4-5 years even though they are specified as 10 year batteries on the datasheet, this is due to the heat build up in the trays they sit in. Be safe 👍

[@Strusiowy]

​@@ExperimentalHV Thank you guys for valuable comments. I thing it can be bad connection problem or how you say in your comment, bad enviroment beacouse box is quite tight and batteires are together squiz in 6pcs series but all 36pcs in one tight box, so maybe thermal condition is to bad so i need to think about improve this. I use only new sets of yuasa np7-12 batteries.