mart360

Had a good day today,

was doing some product testing on some fuses.... not yer namby 13 amp jobs either

200A 250A 325A & 400A and we had to overload by min 100%

luckily its only 12v systems, but we had to have some pretty h/duty gear...

onto the big ones tommorrow should give our 1000A transformer a a good run run

they dont half glow quickly though!!!!


Mart

fatherpierre

I'm surprised you're not blaming the government or police for the glowing

alcazar

iTrader: (2)

And why shouldn't he if he wants to?

Seriously, I bet they make a hell of a bang when they do fuse?

Alcazar

ajm

Out of interest, why are you testing fuses by overloading a minimum of 100%? I would have thought it is more important that:

1) They don't blow before the current they are rated at
2) They DO blow shortly after the current they are rated at, certainly before 100%!

mart360

strange that was my thoughts too,

but if you do some digging.. aparrantly there is a differance between fuses and circuit breakers....

the logic is a cable has a requirement to withstand an overload for a rated amount of time.. i hr i believe it said... so the logic is the fuse should be able to take that overload as well,,,

given that some of these fuses are very substantial, the length of time needed to blow them is longer than you or i would think ok, bearing in mind they are only used on dc volts,, the little ones went quite quickly and made lots of cracks and pops...

the bigger ones were very interesting to watch as the metal heated, super heated and then vaporised..

mind you i killed one set of power cables and the drive unit needs to be uprated to a 1kv unit

cant wait till monday !!!


Mart

Huxley Chick

Ikv Pah, small fry


60kv and upwards now you are talking


My dad & big brother plays with that kind of stuff all the time me I can't even change a fuse

Chip Sengravy

HC, they dont "play" with 66kv + :P

What disconnection times and fuses? - 5 seconds, BS88?

I hope you told the REC that you are destruction testing 630A fuses on their 750 KVA transformer...is that why you are doing it on a saturday?

As said, the current rating of a fuse is not the true rating...its 'how' they blow that counts. Your average 6A circuit breaker feeding your lights will take about 16,000A, but only for milliseconds before it turns to smoke and dissapears in a cloud of dust.

Have fun !

eldudereno

How about putting 100KA through a switchboard for 1 second with all of the phases shorted out!!!

I'll be doing that in Berlin in 3 weeks time.

SWRTWannabe

Anybody else just had a power cut?