Today we explain the parts and mechanics of underground high voltage cable! this is 1500mcm!
Пікірлер: 93
@nemo2273 жыл бұрын
About 3 years ago our street lost power; 22 homes with underground power. The problem was traced to the underground power cable near the #1 house on the street. We (residents) thought it was fault proof having underground power. It took the power company almost the whole day to find the problem. They brought in a generator to give us all power while they dug a deep hole and spliced the bad cable. It was late into the night when we had our power back to normal and they could remove their generator. Those guys worked diligently.
@fosarvian Жыл бұрын
That’s actually not bad.
@nemo227 Жыл бұрын
@@fosarvian It actually happened twice, about 12 years apart. We bought a small gasoline generator at a yard sale 20 years ago. It had enough power for watching the TV but couldn't run the forced air heater. About 5 years ago we bought a duel fuel (gasoline or propane) generator so we could run our house heater and lights. Noisy. Ah, well, at least it's not snowing . . .
@johnbeattie5765Ай бұрын
The guy using the equipment to do the " Fault Locate " must have been new for them to take that long to find where the Fault was ! !
@TupmaniaTurning3 жыл бұрын
Very informative. That’s why I like YT - you can learn loads even if you’re not remotely connected (no pun intended!) with the trade concerned! 👍🏻
@ConstantlyDamaged3 жыл бұрын
That is pretty impressive insulation given how far a 20kv spark will jump. Fascinating info about the slightly conductive insulation layer. Thanks for another great video, and in 4K!
@Klokopf523 жыл бұрын
I actually learned something on KZbin, didn't think that day would come :) Especially your explanation on the concentric Neutral was nice.
@inothome3 жыл бұрын
Great explanation of underground cable.
@robson62853 жыл бұрын
Absolutely interesting! I didn't expect that much interesting knowledge and information to learn about this topic. So i am glad i watched it. Really clear, complete and helpfull.
@tobiasjacobsen_dk3 жыл бұрын
Who would have thought a small piece of cable could be so interesting! Well done sir ! And thanks
@zagaberoo3 жыл бұрын
Until you picked it up, I thought you just printed out a photo. Love learning about this stuff.
@Baigle13 жыл бұрын
Got me too.
@wakes_inc3 жыл бұрын
Videos like this one are what make KZbin great. Informative and to the point. Thanks for the hard work.
@DMSparky3 жыл бұрын
What an absolutely brilliant educational video! You’re a great teacher.
@patrickdougherty27773 жыл бұрын
Went to school for electronics so I understand the principles in your explanation. Other than the voltages in CRTs (yea I am old) 480 in years of maintance is the highest I worked with. This transmission high voltage is a different animal. Enjoy your videos, you do a great job of explaining things. Thank you.
@TheRanaldoman3 жыл бұрын
Reminds me of an AvE video.. no face no bullshit just the nerdy facts. Earned yourself a subscriber. I’d listen to explanations on this stuff any day please post more
@spdfreakls13 жыл бұрын
AvE has way more sayings and is funnier than me. I almost did say "Focus you f&%k!" Lol
@ke6gwf3 жыл бұрын
@@spdfreakls1 I heard you say it, and I don't even watch Ave anymore, but he infected me with Canadian Camera Hatred! Lol
@BluesMan12343 жыл бұрын
Better explanation then my module, glad I saw this before my exam. 👍
@UniquelyUsAdventures3 жыл бұрын
Awesome video! We just used this on a solar field we are finishing up! Your substation video was awesome and helpful also! So now i’m a subscriber! Thanks a lot!
@alecthenice81152 жыл бұрын
Thanks for teaching tri-foiling. Useful on the job
@Yusuf-dx4hw2 жыл бұрын
Thank you so much for your labor. Wish all the best
@TerryMcKean3 жыл бұрын
That was fascinating... has me all thinking about what it takes to keep that crackling high voltage/current contained within that cable. Thanks for sharing, SpeedFreakLS1. If you do happen to make a 2-day long video about this subject, I'll definitely watch that, too. lol ;-)
@franciscoalvarez5215 Жыл бұрын
Thanks. This information is very useful.
@MJ-xb8wj3 жыл бұрын
This is a pretty good explanation. I would like the opportunity to refine your explanation of cable failure as it pertains to Partial Discharge and insulation shield punctures.
@ridefast03 жыл бұрын
International undersea internet cables are built much the same. They have optical fibres down the middle, a bit less power conductor for the optical amplifiers along the way, and about the same amount of white polythene insulation for 10kVdc 25 years life, plus a metal tape outer layer to keep sharks and worms out. In shallow water, there are added various amounts and sizes of armour wires, to avoid abrasion and damage from fishing, landslides, ship anchors etc. I wish we had so few external risk factors as this power cable! But if somebody goes through it with a digger, the power cables make a much louder bang.
@ikocheratcr3 жыл бұрын
Good explanation. I never thought there was so much into a high voltage cable. For me 110Vac is high voltage, I am more in the 12V and less world.
@creazytinr7 ай бұрын
It can go up to 400kV. I have designed a 525kV HVDC and is quite fascinating
@isabellabeltran33392 жыл бұрын
So helpful, thank you!
@ClockworksOfGL3 жыл бұрын
Fun fact: the US Treasury loaned 14,700 tons of silver to make electromagnets that were used on the Manhattan project.
@jcreeker5581 Жыл бұрын
Great video. Thx!
@CHICAGOHAND3 жыл бұрын
Good video. I install, splice, and terminate this stuff every day. Going on 30 years as a splicer/crew leader.
@spdfreakls13 жыл бұрын
Nice! I may do a splice video in the future . We use 3M and Tyco splices mainly. What about you?
@CHICAGOHAND3 жыл бұрын
@@spdfreakls1 Same here
@BobWillits3 жыл бұрын
I've been selling it for 43 years. You are light years ahead of me as an installer. Splicing it looks sooooo tedious, there is no room for error.
@Nerfgunsandpancakes3 жыл бұрын
I enjoy your content
@cronic5553 жыл бұрын
Very cool! Thanks
@ke6gwf3 жыл бұрын
I am picturing technicians running around in steel fabrication shops with little nets catching the soot from the welder's oxy/acetylene torches, a la SpongeBob catching jelly fish.
@spdfreakls13 жыл бұрын
Exactly!!!
@sniperchanel39172 жыл бұрын
Thanka for share verry interesting content
@randacnam73213 жыл бұрын
Another thing the semicon layer in the cable over the conductor prevents is corona discharge in any air voids, as this would create ozone that would rot the cable from the inside. This is due to the dielectric constant of air being barely over that of a vacuum and a small fraction of the dielectric constant of the XLPE/EPR insulation. This means that the electric field in any voids will be comparably higher, and probably high enough to get breakdown. Transformers are in oil baths or vacuum impregnated with transformer resin for the same reason (besides the cooling benefits of oil in wet tank transformers, of course). Also, flux normally refers to the magnetic field of something, not the electric field.
@FixItStupid3 жыл бұрын
Well Done ! Thank You
@cos45782 жыл бұрын
In the middle of the cable cross section is the aluminum nerve
@deinahrsnoidson79612 жыл бұрын
Well explained
@luggisase65013 жыл бұрын
Great to Know Thanks
@FlyingSavannahs3 жыл бұрын
The electric flux is the number of electric field lines passing through an area. Formally, flux is the dot product of a vector field with an area vector. This definition mathematically handles the general case when the electric field lines are not perpendicular to the area they are passing through. A super useful application of this dot product definition of flux in electrostatics is Gauss's Law. The total flux passing through a surface that completely surrounds a volume tells you the amount of charge contained within.
@jijovarghese1987 Жыл бұрын
Vary informative
@hanksundermeyer5293 жыл бұрын
Have you ever seen a 3 phase 34.5Kv circuit carried in a cable on a pole above ground rather than open conductor? Thank you for the video.
@windward28185 ай бұрын
Do you have to de-rate this cable ampacity when using it in conduit underground? If so, do you use the NEC or is there a special wind farm standard for underground cables?
@trcostan3 жыл бұрын
What’s the reason the concentric neutral isn’t aluminum?
@markholder68513 жыл бұрын
Good video. I wanted to know if the high voltage was phase to phase, or phase to ground
@BobWillits3 жыл бұрын
He sort of explained it. Phase to ground is 19,900. You get 35kv phase to phase because each phase is offset from the next by 120deg. So 19,900 x 1.73 (square root of 3) is approx 35kv. The generators and transformers are churning out 19,900 per phase. When you calculate the 120deg offset, the voltage from phase to phase will read 35kv.
@chrishadjipetris60593 жыл бұрын
I've seen a similar cable, or this cable about 4 years ago in technical school, and the told us something you didn't say (or I probably didn't hear), this cable acts as a capacitor, and if you have to work on it, after shutting the electricity off, you have to ground the conductor, or you will probably get killed
@spdfreakls13 жыл бұрын
Exactly right!
@sub873425 ай бұрын
I have a question is there a type of non contact tester for medium voltage cable like this ...also does the hex bolt head in the insulated plug become energized when the wire is energized? Or does it remain with no voltage on it.
@spdfreakls15 ай бұрын
Great questions! There are non contact testers out there. One is a Salisbury 4744, for URD cable. On the hex head on the insulating plug, it's insulated from the other end where the stud is. It may build up a charge, but does not have any voltage on it.
@davidbroome64373 жыл бұрын
I wish he would have talked about electric trees and water trees in the insulation .
@tadzpalys89273 жыл бұрын
was that section cut on a deli slicer?
@spdfreakls13 жыл бұрын
Haha close! A horizontal band saw set to cut only 1 inch per minuite to keep it smooth while held with a vice to keep it straight.
@RB-xv4si3 жыл бұрын
Why would a neutral be needed in a 35kv transmission line? What use would it be? No loads are running off 19kv or whatever it was line to neutral. Is it there just to have a grounded system for the power transmission?
@randacnam73213 жыл бұрын
Dielectric stress control and cable charging current.
@jtdenton14832 жыл бұрын
Actually, due to the skin effect, it would be the stranded cable that would be the better conductor rather than the solid. That's why tri-rated cables come in hairline wire flex strands.
@carlsmith3709 Жыл бұрын
What you explain they the semi con should not have flags on it when cut
@WitoldWitkowski3 жыл бұрын
When you talk about flux, I'm assuming you are referring to lines of magnetic flux?
@apollorobb3 жыл бұрын
Look up Faradays Law
@Berkeloid03 жыл бұрын
@@apollorobb I looked up Faraday's law but it only talks about magnetic flux. When he describes flux in the video, it seems more like he's referring to the electric field strength so I'm not quite sure either.
@Galeere23 жыл бұрын
From what I've read, the partially conductive layer is there to avoid partial discharge. Its evening out the distribution of the electric field. Similar to corona rings avoiding spikes in the field strength and discharge to air.
@robson62853 жыл бұрын
@@Berkeloid0 he is indeed talking about electric field. I think it is like that blue corona around a hv loaded conductor in air. Something like that plays a role inside the insulationmaterial as well as in air, i think. But indeed is flux a strange word for that effect, at least for us who know the word only referring to magnitic fields.
@Galeere23 жыл бұрын
@@robson6285 electric flux seems to be a valid term. Its the strength of the electric field per area (field line density). But im not sure if we called it that way in physics class
@FlyingSavannahs3 жыл бұрын
What happened to the serving plate layer? That's the only one I got right on the quiz! 😭😭😭
@mikaeljiskovkristensen78613 жыл бұрын
where are your videos about the 345 kv and 34 kv substation.
@ginah39213 жыл бұрын
I am looking for them too! They are the best substation videos. I wanted to show them to my power systems class.
@totherarf3 жыл бұрын
I may have misunderstood, or it may be different in different countries, but ..... Is the HV not generated in Delta format? This would mean there is no real Neutral. It is my understanding that the neutral is the Star point and only exists on LV (415/240 in the UK) and is connected to earth at the star point! Obviously this then "anchors" earth potential to neutral on LV and keeps the HV relative to this! I was a tad confused when you talked about Flux. Magnetic flux runs parallel with the flow of current .... this is totally different from the Electric Field which runs at right angles to this! ;0)
@randacnam73213 жыл бұрын
This would be a 19,920V/34,500V grounded Y system so there is a true neutral in the system. The neutrals in this case carry the charging current of the cables, as the main load is 3 wire delta. USA/Canadian distribution systems use a lot of Y connected systems for their primaries (2,400V/4,160V, 4,800V/8,310V, 7,200V/12,470V, 7,620V/13,200V, 7,960V/13,800V, 14,400V/24,940V and 19,920V/34,500V are the normal ones, but there are others). Primary in this case refers to what is connected to the primaries of distribution transformers, which are what feeds angry pixies to the end consumer.
@totherarf3 жыл бұрын
@@randacnam7321 They would be Extremely angry pixies in my book! ;0) Primary does have a different meaning in distribution systems. Here in the UK Primary substations take the distribution voltage (400KV Delta) and drop it to various intermediate voltages to distribute to "normal" substations with it ending up at 11KV to 415/240 (Delta Star configuration). The Star point of the 415/240V is the neutral and is also taken to the body of earth via mats and rods! This allows earth fault detectors to pinpoint faults on the HV and allow remote switching to get people on asap!
@mikevarela7053 жыл бұрын
Hey whatsup man! Hope all is well! What happened to your other videos? The sub ones, etc
@spdfreakls13 жыл бұрын
I had to take them down due to an owner request. Very sad about it but i need to respect their wishes!
@mikevarela7053 жыл бұрын
@@spdfreakls1 Yeahh thats unfortunate but I get it.. Those were awesome vids man!! Im a grad with a major utility and am currently based at a 400kV HVDC station and those vids were super informative!! Perhaps we can keep in touch on other social media platforms..?
@spdfreakls13 жыл бұрын
@@mikevarela705 nice! Any way to share some videos of that DC yard? That would be awesome!!!!
@mikevarela7053 жыл бұрын
@@spdfreakls1 Yeahh man forsure, you on IG or Twitter?
@midnightwatchman13 жыл бұрын
what you mean by flux, do you mean electric field or an induced magnetic field and why does it "bleed" ?
@JBernhard723 жыл бұрын
Electric fields... look up Eddy currents
@midnightwatchman13 жыл бұрын
@@JBernhard72 "flux" is a very fuzzy term to describe the induction of eddy currents. I thought eddy currents are induced by varying magnetic fields. where did the magnetic fields come from.
@Jc-in9fe3 жыл бұрын
Looking for splicers? 😁
@realtips3333 жыл бұрын
👈You doing electrical cable termination 👈watching this channel
@hedgehogbun3 жыл бұрын
Kinda wished you had a close up for most of the video.
@spdfreakls13 жыл бұрын
Agreed. I'm new to video stuff. This was my first time using a tripod. When i got the camera too close it blocked the light. I'm slowly figuring this stuff out!
@hedgehogbun3 жыл бұрын
@@spdfreakls1 Thank you. I really appreciate the detailed explanation of this cut-away sample.
@charlesshannon53332 жыл бұрын
@@spdfreakls1 pretty accurate description of cable structure. I'd have phrased a couple things a little differently. I'd be curious to chat with you about your thoughts on cable testing.
@BobWillits3 жыл бұрын
The sample slice is deceiving. That does not look big enough to be 1500kcmil. I sell 500, 600 and 750 and that doesn't look much bigger.