A look inside a blown 36kV fuse.
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- เผยแพร่เมื่อ 26 ก.ค. 2024
- I'd like to thank Chris for sending this fuse. It was one of three used with a 6 ton resin potted 33kV transformer.
Sorry for the overzealous audio levels at the start. I didn't realise the forehead mic was going to pick my voice up so well.
The fuses have spring loaded pins so that if one fails either by overcurrent or thermally, it fires out a spring loaded pin that then trips an isolator. I'm not 100% sure where the auxiliary wire that allows the spring to release is connected to, since most of it had been obliterated in normal operation. I wonder if part of the triggering is done by pressure build up in the fuse when it blows.
A link to one of Rodalco's videos showing a trip mechanism:-
• RMU striker pin had op...
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
www.bigclive.com/coffee.htm
This also keeps the channel independent of TH-cam's advertising algorithms allowing it to be a bit more dangerous and naughty. - วิทยาศาสตร์และเทคโนโลยี
Clive, to be honest, I was amazed how good a microphone positioned on your forehead reproduced your voice.
It was a coworker in the audio department of a show who mentioned that.
Especially considering he was outside
Not uncommon in musical theater productions too, where they often hide microphones in wigs, with the capsule right over the forehead.
Much better audio with the lavalier arrangement than the off body arrangement. Next time, clip in to your collar. Television is typically "Pretty pictures with sh!tty audio".
@@nooneyouknow9399 with a beard like that? nah...
So that's the China you keep talking about getting cheap components from!
That's how you get tools with the correct cat rating from China.
Khajit has wares if you have coin
@@Gameboygenius So does that confirm a Cat III meter has been checked by three kittens ???
Just like ToT's kitten.
Other cats bring home dead mice and birds, Clive's cats bring cheap electronics.
That mic works wonderful but looks a bit... weird...
But we have a cat in this video, this has to be a good video.
if it's stupid but it works, It's not stupid
Now the TH-cam algorithm is going to link to hundreds of thousands of more viewers.
Poor kitty needs to groom thyself.
2:24 Cat's Total-Indifference-To-All-Things-Fuseological-switch finally trips
Why does his cat look like him?
The reason for multiple ribbons is for the current breakage curve, multiple thin ribbons have a faster curve while fewer thicker ribbons for the same rated fuse has a slower curve.
Thats why this was a "medium" rated fuse, kinda like a Type C vs a Type B MCB, A fast blow fuse would have more thinner elements spiraled. while a slow would have fewer thicker...
The two ceramic element holders are used so more elements can be fit in a smaller unit, the elements are of the same length and thickness that are used on the inside as the outside.
The firing mechanism is just a different type of fuse element designed not to rupture until the other elements have blown, But is also run in parallel with them, this element is under tension by the firing spring and once it snaps, it shoots the pin out the cap to trigger the disconnector to prevent a seriously unbalanced delta arrangement of the circuit causing ferroresonance.
Excellent explanation...must be cos I think even I followed it!
Here is a how it’s made on a similar fuse but it has a different striker mechanism. th-cam.com/video/oKc3mOjKRb8/w-d-xo.html
Fantastic, thanks for sharing your knowledge with us!
Photoninduction alsow made a vid about a similar fuse but its striker was pyrotecnical
Interesting explanation of the 'speed rating'. Clive - you should pin this comment :o)
It's amazing how the fuse wire is blown in so many places. I'd imagine it would break in one spot, maybe two or three, and then the circuit would be sufficiently broken. But no, that wire was just obliterated! Cool!
The silica glass is called “fulgurite” when it’s caused by lightning strikes. I imagine it’s got a similar composition, plus a few extra metal impurities. Fascinating stuff!
4 years too late for the video and 7 for a personal story but now I finally understood why they made us wear the mics inside our wigs. Surprisingly good audio quality considering you were outdoors. Now honestly considering putting the mic transmitter in the inner fold of my work cap rather than my neck strap when taking calls on site.
I was looking for the mic, now I can't stop laughing 😅
I'd been considering the idea of ear or glasses mounted mics and dismissed it as ridiculous. Now I'm not so sure :-D Off camera it makes perfect sense!
Adam Savage has mounted a microphone in his glasses. Apparently it works quite well.
Well, from a comic before. bigclivedotcom stated that he got the idea from an audio guy. Then someone's comment. Well, it is kind of used a lot by those on stage. They hide the mics in their wigs and it picks up the audio rather well. All without having it out of place like a clip or on a pair of glasses.
Well, in that case I suppose a beard mounted mic wouldn't be so stupid either, it would also act as a wind guard!
Mic can also be mounted in hair
th-cam.com/video/rrapQ5HyH0k/w-d-xo.html
the quality of the the audio at the beginning is actually excellent.
I think I see how it works. The outside fuse normally carry the current. When the outside fuse blow the current flows through the inside fuse long enough to burn the filaments and trigger the plunger before the fuse itself burn.
I love your wee sidekick, more of her please!
WOW!
I’ve been using my X-ray device all wrong!
No wonder why my television doesn’t work.
Clive: watch out kitty.
China: see these claws? You're the one who better watch out pal.
China: And one of these is made in cHiNa
Human with Hammer vs Cat. Come on dude :D
The cat lol! I just lost it. "Lots of ceramic... watch yourself kitty!"
Man I've been watching this guys videos for a while but I've never seen his face and he looks like an American biker but his voice is so soothing
China is EXACTLY the kind of cat I expected Clive to have.
a huge fluffy deal of a cat
i expected her to get startled once he started whacking the fuse, but i forgot to take into account that she’s big clive’s cat and thus probably more than used to banging, cracking, arcing and exploding noises
They use the same X-ray device on my luggage when I fly from Manchester airport
The same X-ray device is used in MOT to search my cars underbody for rust....
The same x-ray device is used to find broken bones
I use same x-ray device to x-ray a nail
What a big one you have! And out in public as well! Great seeing the kitties again, and a bloody impressive fuse as well!
Hi
I'd love one of those fuses for my collection 😉
You are right about the centre wire releasing the striker pin, however you might be a bit surprised how if you haven't found out already.
When the fuse blows the fuse wires do melt and the sand ensures good insulation but the centre wire doesn't melt.
At the striker pin is a small pot of gun powder and the connected centre wire sets that off. This then forces the striker pin through the end of the fuse against the trip plate which physically disconnects the transformer.
First time I see your face in a video and what a shock to get that face and beard matched to this voice. I had some totally different expectations. Nothing bad just a head twister for me.
Did not notice the mic until you pointed it out
The quality is strangely amazing, I would have expected shitty sound but it's without a doubt excellent
Microphone sported "west end theatrical" style.......... such a luvvie!
Uhhh.... He has a sophisticated voice and language use,and he looks like a BORN TO BE WIIIIIIIILD rocker! 🤘
This and Rodalco's video is insane to me. The fuse holder looks like a mega version of an old school AGU car fuse! I would of thought that something that could handle 1+ mega watts would have to be bolted together.
That thin fuse wire connects two sides of the fuse. When main fuse wire fails current has nowhere to go but through the thin wire. It melts and releases the pin.
Yep !
That’s what I was thinking.
I wanted to say the same.
That's what I was thinking, to stop it failing first I imagine it has a higher resistance so that the bulk of the current flows through the main ribbons until they pop. Clive, was there a resistor in there? Can't think how else you'd keep the current off that small wire in non-fault conditions.
Thin wire will have a higher resistance than the fuse wire. No current will flow until a fault. I also assumed the construction allows for different ampacity fuses in one form factor by adjusting the number of coils from 1 to four? Then again it may need all four coils due to the high voltage. Things are "special" at those potentials.
China looks just like my first cat. He was very free with his claws, too.
Isn't that breed a claw friendly one then? Because my friend's cat, a hair short of being a copy cat of China is exactly the same. Whenever i visit him, it's like a war zone has been going over my hands. :))
@@aserta I don't know about China or your friend's cat, but my first cat wasn't any breed: he was just a happy accident. He was very friendly and loved to wind round people's legs, or be picked up on his back and have his tummy tickled, but he also liked to seize your hand, bite you savagely, and disembowel you with his hind claws.
@@zh84 Sounds like most domestic cats, they do that thing like "oh that feels good, scratch me, scratch me I WILL DESTROY YOU, HUMAN, TAKE THAT!"
You are right with the trip mechanism - it has a wire holding it in through the whole fuse. When it blows, the central wire becomes the final conductor and blows releasing the pin. In some fuses this can be done with a small explosive charge that is detonated by the potential difference across the fuse once it blows.
Hi. I've been inserting these Siba fuses in the HV switchgear on windfarms around UK for last 4 years and never seen inside of it.. :) They are quite pricey to just crack one open and have a peak he he,but I was always curious,so thank you Clive! All the best
Nice video! I am not familiar with this type of fuse so it took a couple of minutes on google to find a pdf file about them. I will ccp a bit of it.
Striker mechanisms are driven by explosive charges or
compressed springs. Both are triggered by a thin fuse
wire running the length of the fuse, usually through the
centre of the star shaped core. The wire is connected
in parallel with the elements, so a current flows
through it when the elements melt. The current
heats up the wire and detonates the explosive
charge, or melts the wire andreleases the spring,
pushing the striker pin out of the fuse link’s end
cap. A lock washer mechanism makes it impossible
to push the pin back into the fuse body
Thanks! Keep the microphone on your forehead- you sound better lol
Agreed.
I don't agree - it's too boomy, at least with headphones. On an anemic cell phone speaker I imagine it'd sound better.
I too agree. BC sounded a lot clearer and I found I didn't have to crank the volume up so much.
Don't say that !!! All it will take is a very heavy night at the pub and the next time we see Clive he will have Gorilla glued the microphone to his forehead. The poor guy already has a probe up his butt ! ;-)
1:09.
I have seen videos of these being made. It is absolutely amazing to me just how little metal is used inside as a fusible material and still be able to carry the voltage and amperage that goes through those power lines. And they go bang when the fuse blows because when the main circuit is broken the current flows through a minor circuit to a small explosive charge that drives a pin out of one end so that it knocks the connector away and lets the fuse swivel down so that it is easy just by looking to see where and which fuse is blown. Someone really thought that feature through thoroughly and designed it good.
I saw the Band-Aid as soon as you skipped to the inside, I knew immediately what had happened. Safety first; where is your gloves friend?
The mic on your four head makes you look like an Indian Princess. ROTF. I’ve learned so much from watching your videos. So please keep doing what you do because you do it so well Princess.😂
CHYNA as in the female wrestler?
Oh, and I enjoy watching very smart bears smash things 😁
That cat is beautiful.
Your cat is saying are you doing this? Why do cats make you think you are bonkers? I have to say this was fabulous.it was informative but the cat added an extra dimension. Love it!!!!
your sound is way better than some of the other youtubers, i can clearly hear your voice
It was a bit loud and touching the overload a little, but the sound was actually good. Better then when you were at the bench. At the bench it simply sounds flatter.
"thermally sensitive solder" made me laugh a little
"I'm being careful here because this is quite sharp ceramic" ... cut to the bench ... with a band aid now on the pinky :D Anyways, I love your videos, you share so much detail on an understandable level.
Was just about to say maybe the inside core bit was the fuse for the mechanism but then you suggested it. Entertaining as ever.
WTF the microphone quality is so good! It sounds like you voiced over with a condenser mic in post LOL
Lets hope NHS cost savings don't lead to the widespread adoption of bigclive's "X ray" devices...... ouch!!
Gee- here in America- they make you go out and find your own x ray device.
Makes diagnosis much simpler. Not sure whether you have a broken bone? Go for an "X ray". Now you definitely have!
It's really nice to actually see you Clive, I don't thyink I ever have before.
That mic placement is actually ingenious.
"Watch yourself kitty" : China "Clive speaks kitty, yay! Wait!?" The plunger trip mech looks to be a more easier than you'd think.
I liked the sound better from that 'hat' microphone that the audio from your bench. Please consider incorporating in with your 'inside' videos.
A good comparison for the plunger system would be a sprinkler head in a commercial sprinkler system. It triggers at about 120F or slightly higher, melting a soft metal. I think you figured that out. Great video.
Thanks Big Clive. Thanks for showing us a HUGE fuse. Very interesting how it seems to work and indicate a fault.
Never change Clive, never change. 😍
Big Clive, keeping science sexy. Great video and have to get me one of those x-ray machines!
I have an old one that I still use, it has a "Microsoft Windows compatible" sticker on it.
My word! Big Clive has a face!!! And he looks like ZZ Top road crew!
Wow!
That's mindblowingly cool!
That's bizarre. Not only do you sound like one of my old co-workers, and talk like him... You also look like him. But you're across the pond. Madness, I tell you!
Remember the explosive disconnect video? I believe that fuse is called a hammer fuse and uses explosives in the middle winding to pop the pin out. Might also be why the fuse is cracked around the pin. Another great video as always. 👍👍
It cracked because of the heat. There is no explosives in this type of fuse.
download.schneider-electric.com/files?p_enDocType=Catalog&p_File_Name=AC0479EN_042016_web.pdf&p_Doc_Ref=AC0479EN
@@mettisha I saw it On how its made one day oh wait here is the link th-cam.com/video/oKc3mOjKRb8/w-d-xo.html
Cat in the video, instant increase in likes! 😄
Also double the views
Instant Dislike because Cats are evil guardians of the underworld!
@@AJB2K3 LIES!
@@AJB2K3 Well, yeah and? The Underworld is not an evil place. It is a realm that is both heavenly and beautiful but also a place of pure terror and horrors that no mortal soul should bear witness to with living eyes. It is all a matter of how you are judged and where you go. Also, able to pay the Ferry Man. As he is the only man to take you there.
So Cats guarding the Underworld is basically just akin to Cerberus, the Three-Headed Dog, guarding the door. After all. Need someone to keep the riff-raff in their place. Plus Cats are not always guardians but also Gods in their own right in some beliefs.
@@ke6gwf That will never happen, I am always guarded by mans best friends aka dogs! :P
Great Mic placement, Agreed. But that BEARD. Having never seen you, I would NEVER have guessed what you look like. Not even close. Amazing.
I wonder how many people would have actually seen the mic before you mentioned it but to me, the sound was perfect for being outdoors that is.
Enormous Fuses PLUS a Cat. Can’t cope
Now that's a fuse. Get some safety squints for the moggy😂
In a Paul Hogan voice "That's not a fuse… THAT's a fuse."
AvE
I suspect if you attempted to apply safety squints to your feline unit you would learn the meaning of the words “catastrophically incompatible”.
Hm. Sand-filled fuse… We used to have 750V= fuses on the 50’s class trams we had in Oslo until ≈2000. German "Drei kanalen patrone". Popped open a broken one one day, and indeed, it was like a long flat wire (or band) going in and out of three longtidudional (damn, that’s inspellable…) sand-filled chambers. Longis porcelain things, came in 2, 10, 16 and 25 or 30 amps (Lights, compressor (was 10, got changed to 16), heat (motorcar) and heat/lights/track brakes on trailer. Trailer had its own set of fuses for lights, heat and track brakes (was 24 V battery on motor car, 600 V= on trailer).
All the fuses on the motor cars were on a board above the head of the driver… :P
Very cool vid, thanks for sharing! :D
As soon as I seen your majestic beard I thought, that has to be a decent condenser mic.. easy to see you well educated! Love your videos man. Specially the tattoo videos.
yeah your last statement is what my general thought is.... outer is designed to trip a little earlier (or same... as its designed to carry the majority the load normally, lower resistance and lower inductance with the wider turns spacing than the inside core, and of course skin-effects) and the release is attached one side to the cap the other to the inside core... the voltage drop of on the release is kept in check due to the outside wrap, but when that wrap goes, the inside picks up the load (momentarily) long enough to trip the release-striker before it too fails open.
todkapuz It probably triggers the striker BY failing open, in the most basic of ways: Blown fuse wire not able to hold back that spring.
Yes the fuse wire is connected internally at the bottom.
Had a spate of very close lightning strikes a few years ago out here in rural colorado where I was calling the boys out with my cell phone due to the fact I could plainly see the transformer fuse had blown and was now dangling in the breeze. Those come apart both ends and they were rebuilding them on the spot with a pulled apart ordinary lamp cord to my amazement. Most other times they have one ready to go and I didn't get to see them rebuilt before.Three times for mine that summer season, and simultaneously one apiece for two other utilities within a 1/4 mile from me. I jest that zee germans will eventually get me dialed in on those 88s.
It took me 30 seconds to notice how nice your audio quality was for sitting outside. 10 seconds after that I noticed your hat lmao good job 10/10
more videos outside with kitty!
"Oh, are you trying to concentrate on making a video where you're the centre of attention?"
- China
That is crazy how clear that mic is.
Love the content Clive! Stay safe with these crazy things you've been up too.
Glad to see you jumping on the Louis Rossmann bandwagon and finally including some cats in your videos. More of this please!
Man, you have to have a fun time eating soup!
Yeah, i bet he dunks it in the soup so he can eat (slurp) on the go.
Best thing about it is if he is ever hungry all he needs is hot water to dip his beard into and instant soup! 😁 Clive if you read this I'm just poking fun. Keep up the good work!
"What are you doing, China?" I ask that question often
I didn’t picture you as a person with a beard.Finally your voice is connected to to who ya are. Enjoy your videos
Big Clive; "I do have ... a X-ray device ..."
Me taking a reminder: "Never let Big Clive take a look at my bones!"
I believe you are correct, Clive. Ray (Rodalco2007) made a video a while back explaining how the pin was activated. Maybe Ray will see this video and comment on it... consider the time difference in NZ.
Sorry, i was mesmerized by the cat, had to watch it again.
😂😂
China was eyeing up Clives beard! The forehead mic is giving very clear sound, actually better than the sound level of the normal indoor footage.
Those do make a hell of a bang when they go off! As you were "X-Raying" it, I was thinking; "Be careful with that ceramic..."
The microphone on the forehead is awesome. I can't look away from it.
"China is doing what China does." - Big Clive 2019
"...Oof hold on human, my claws got caught." - China
This reminds me of a related video by Photonicinduction, where he examines a similar fuse rated at 36 amps at 11,000 volts. It had a similar ceramic core with the same sort of flat strip wire wound round in a spiral, with a single "trigger wire" running right down the middle inside the ceramic core. When the main spiral winding blows, the current is then forced to travel through the central trigger wire, which ignites a tiny pyrotechnic charge in the end-cap to release the spring-loaded rod. Since you've got a fuse which is already blown, that charge would have already gone off, so won't be there any more.
Link: th-cam.com/video/sqcaRamjr4M/w-d-xo.html
I was parked beneath an HV line one day watching a small thunder cell drift across the river valley towards me. The lightning struck the line in the distance and a fuse on the pole next to me (a smaller version of your whopper) detonated with a loud bang and a concussion I could actually feel. As intended, the fuse disconnected itself and swung down out of position.
At the time I was working on a hydro electric site where the largest generator (500KW) exported to the step-up transformer via two 400A fuses on each phase. I understood that two fuses in parallel were used to give a faster response time - one fuse would always blow first, massively overloading the second which instantly vapourised. One single thick fuse element would react more slowly. This was all 1960's technology and was all replaced with a new sub a few years ago.
Ive watched your videos for 2 years and only saw what you looked like now. Have to say I need to check myself . Nice video
Best x-ray device!!! 😂🤣😂🤣😂🤣
great video ... it the first time i see you in this beard.
Current flows through the indicator wire which is connected to both ends and it snaps which allows the spring to push the pin out.
Exaccary the same on the square body fuses we use for low voltage protection.
The Unicorn style mike mounting works a treat, I may steal that suggestion.
Wear gloves when disassembling fuses, those edges are like glass.
Regards to China from the wildlife here in South Africa
@Matt Bergman Possibly, I am personally not a big fan of my fingers leaking all over the place.
Just started following your TH-cam Channel Clive and seen this- Anyone who's a cat-lover is a friend of mine! Keep up the good/humorous vids!! Now, where's that cat of mine gone? he was here a moment ago...
The audio was fine. I love cats too. it would be nice to have a video with cats and no electronics for a change.
How about...cheap cat toy reviews? I'm sure he could make a few videos ft. China
Also videos taking said toys apart assuming he buys doubles or the toy breaks from play...
"big fuses, small fuses, cardboard box"
The cardboard box is for the cat.
Giving this a like for the cat and the mic. Amazing. Cool fuse too!
Your cat is like soooo used to you hammering and talking to yourself. It's uuuuggghhh he's at it again.
Yes it’s certainly more complex than a BS 1362 and I recon a touch more expensive to replace 😀
Clive you didn't show us the plug and socket that fuse fitted in ⚡🤣
@Nick Bird: Right, and also where can I find an Arduino shield to go with that?
The trip mechanism is based on an explosive charge connected to an under-rated wire, starting at the trip indicator and pulled through the center of the fuse then soldered at the other end of the fuse in direct contact with the actual silver fusible wire. Once the actual fuse blows, the under rated wire blows and triggers the explosive, activating the tripped indicator.
OMG OMG OMG Face to the voice 10/10 microphone placement
China was "kneading dough" it's infant cat behaviour for getting milk from mum. I think she likes you.
Mum must’ve had a big beard too
She's barking up the wrong tree. Clive isn't into the pussy.
With ours, anything woolen hits the spot! Kneading seems to be associated with lots of satisfied purring too!
@@juancornetto8243
Wait ... Clive is gay ...??? In that case, is he a Bear ...?😉😆
@@nigelft he has referred to himself as a "bear" on a few occasions and i think also has a "bear" flag on his website
Must be quite an expensive fuse.
That's what I was going to say. It being industrial (money no object) and there's so much stuff in it.
Glad to see your site supervisor aka cat is at hand. Ours is always available to ensure safe working practices are applied!☺️
that is the most beautiful cat omg. theres moments where hes just basking in the sun
China Sez "I Wub You"
That's not a fuse this is a fuse. At first I thought o snap he gonna take a hit on the bong. Cypress hill.
IMHO, I think the outdoor scene with the mic on the forehead, sounded 100% better.
I never heard the brows. The mike worked fine for me. Two thumbs up for the cat.