World’s BIGGEST Electrical Transformer Video
ฝัง
- เผยแพร่เมื่อ 1 พ.ย. 2018
- The world’s first transformer, which Siemens developed and manufactured for high-voltage direct-current (HVDC) transmission systems with what is currently the highest transmission voltage of ± 1,100 kilovolts (kV). The workflows for manufacturing and testing this product were challenging due to the transformer’s extreme dimensions (LxWxH: 37.5 m x 12.0 m x 14.5 m) and shipped to China where the transformer will enable a high-voltage direct-current (HVDC) transmission with low losses over a record distance of 3,284 kilometers with a transmission capacity of 12 gigawatts.
An HVDC converter converts electric power from high voltage alternating current (AC) to high-voltage direct current (HVDC), or vice versa. HVDC is used as an alternative to AC for transmitting electrical energy over long distances or between AC power systems of different frequencies. HVDC converters capable of converting up to two gigawatts (GW) and with voltage ratings of up to 1,100 kilovolts (kV) have been built, and even higher ratings are technically feasible. A complete converter station may contain several such converters in series and/or parallel.
Almost all HVDC converters are inherently bi-directional; they can convert either from AC to DC (rectification) or from DC to AC (inversion). A complete HVDC system always includes at least one converter operating as a rectifier (converting AC to DC) and at least one operating as an inverter (converting DC to AC). Some HVDC systems take full advantage of this bi-directional property (for example, those designed for cross-border power trading, such as the Cross-Channel link between England and France). Others, for example those designed to export power from a remote power station such as the Itaipu scheme in Brazil, may be optimised for power flow in only one preferred direction. In such schemes, power flow in the non-preferred direction may have a reduced capacity or poorer efficiency.
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Please let # ElectroBOOM play with this transformer!
No problems with Mehdi (Electroboom), but I think Andy (Photonicinduction) could better handle this bad boy.
He will build a FULL BRIDGE RECTIFIER and because the DC is less dangerous, he will put the wires on his tongue
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😂😂😂😂 it shorts out end sets the house on fire electroboom is the best
@@hans8905 yes he puts more power in it (photoinduction)
I need this buck converter for my next arduino project
ur arduino will be explode XD
Seems legit
@Benjamin McCann its true i think :D
Wouldn’t a step up transformer be part of a boost converter?
@@dlayman101 yes i think, bcs both of them use copper coil
"Hello, Power Company. What's the issue?"
"Our transformer just blew."
"Oh dear, we'll send a line crew out right away."
"No, you don't understand..."
:D :D :D :D that's epic!
"the future looks bri---" *transformer explodes, killing narrator*
lmfao this is underrated
think he was the voiceover guy for orange... futures bright, and all that ha ha
But the camera man lives on.
The rule of thumb is that electricity will arc (not plasma, where the current increases exponentially in ionized, conductive air, but in non-ionized, non-conductive air) 83,000V per inch. At 1,100KV, the arc will travel many feet. Therefore, in order to prevent the electricity from reaching ground, it must be insulated on very long, heat-tolerable ceramic insulators, or bushings. The bushings must be heat tolerable because it is not just voltage in the electricity, but also thousands of amperes of current which produces higher heat as the current increases. The bushings are designed to look like bee hives, or discs, because electricity travels along the outside shape of the insulator, called the skin effect. This is a natural characteristic of electricity. So, shaping the bushings in discs makes the travel path longer. The alternative would to have extremely long, straight bushings. But with disc crests and troughs, the electricity travels along the shape of the discs, which is a longer distance than straight along a smooth, straight insulator. The ends of the bushings are smooth, large rings to reduce the corona effect, which is leakage of voltage into semi-conductive humid air. Air contains water vapor to different degrees, depending on the weather. Water is conductive. Any corona effect or arcing of electricity to ground will reduce the amount of available electricity to the source and, thus, reduce the efficiency of the transformer. Also, arcing causes, as with lightning, the air to become ionized (the oxygen in air gains an extra electron, which it does not need, and thus allows it to travel from one oxygen atom to another creating a conductive path), which allows high current flow from the transformer to ground. This also will ionize and remove the conductive metal that the transformer is made of, slowly destroying metal terminals of the transformer. Since higher power (voltage equals power divided by current) and low frequencies (power is transmitted at very low frequencies of only 50 Hz or 60 Hz) require larger transformers, switches, relays, circuit breakers, wire, insulators, and other things found in a substation, the transformer must be large. This is because the larger size of the transformer allows the transformer to dissapate heat, prevent arcing, provide enough metal to allow high power flow, provide enough distance between the power and ground (through the large insulators), and prevent the corona effect. Such high power would consume and completely destroy a transformer that was too small to allow an inch of insulation per every 83,000V. Electric energy, U, is equal to capacitance (the ability to hold a charge) and voltage. A coulomb is equal to an ampere of current per second. Both a coulomb and electric energy increase with an increase in electrical power. Coulomb, U, C, P, V and I all are characteristics of electricity that require larger-sized electrical components to provide proper transfer of these characteristics without any losses. A large-size transformer also has room for current-sensing transformers to be placed on them. These smaller current-sensing transformers give a direct, meter readout of the current flowing through the transformer at any one time for the linemen monitoring them during the varying loads placed on the electrical grid during a day.
Frank
KB2VNG
Frank Reiser Video/Audio Service
lmao I learned more from this comment than I can remember from school. god bless you
Thank you Mr. Frank for your valuable feedback and knowledge that you shared with us.
Have a great day !
@@ccllvn Because u recalled school after a few years.. you wrote this comment directly after reading it.
Its like learning for a school test, after writing the test you will basically just forget half of it
You r a genius
Good job on the copy n paste there guy...
For all the people that are confused about hearing a DC transformer: Pls note that the Transformer's name is UHVDC transformer (Converter Transformer). It is used in HVDC converter station that's why it is called as DC transformer, although the working principle is same that of AC transformer (Mutual Induction).
Whats optimus prime?
Quantity of insulation also increses with increase in voltage rating.
That's why size of the transformer increases .
Thank you for your feedback!
Have a nice day ^_^
This is the absolute correct answer. More power / KVA equals larger wires, higher voltage means thicker insulation. And of course you have to have a magnetic core that won't saturate along the way. All of these factors combine means transformer tanks get larger and larger along with the size of their insulators to offset the huge voltage gradient between the ground and transformer case and the incoming voltage.
The bushings on this transformer look like the main guns on a dreadnought!
The overall size of the trf increases with voltage rating because of 1) Increase in insulation thickness and duct spacings between HV and LV and also LV and ground(tank). 2) increased Bushing length due to very high air clearance to tank surface and also it's application in hvdc to counter tracking phenomenon owing to higher pollution levels in hvdc environment. High power rating too contributes to increased size of the transformer due to heavy windings to carry high currents and higher magnetic clearance requirements to avoid eddy current heating of the transformer tank.
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I'll just pretend I understood what you wrote...
the size increase is primarily thicker insulation to contain those higher voltages.
*thiccer
Thank you for your feedback!
Have a nice day ^_^
When you need to step up and down those lightening strikes
Nice
I'd like to see the 1100kV rectifier.
Ain't that the truth!
There is no rectifier. Only D.C. Is needed. One can spin off secondary taps at the an amount needed. Transformers distribute electrical energy, not produce it. Generators produce Alternating current. A rectifier converts AC to D.C. DC current has large Current squared Resistance losses, AC losses are used to minimized power losses in wire distribution networks. DC current is not efficiently or sufficiently economically practical. Power transformers are used to convey power distribution from point A to points A, B , C....etc. voltage is just one measurement to describe the transformer capability. However the current a transformer can provided explains the power the Transformer can handle. The higher the amperage capability the more power transferred. More money designing, testing and shipping the transformer is the biggest factor. So why not build a factory on site or nearer the site needed?
@@erin19030 I have degree level physics. I know what a transformer is ;)
Why is everybody saying 1100KV instead of correct 1.1MV?
It's same with capacity, why is everybody saying 20 000 mAH instead of 20AH?
Vít Cenek
Cuz that’s the unit which commonly used
If you checked almost all electric equipments used KV as a unit or KVA or KVAR or KW to define electrical elements
kilo mostly used but doesn’t mean you are not allowed to use MV as well
Siemens dont play ..bravo 👏👏👏
I remember hearing a year ago about scientists reaching 1 MV potentials at scanning electron microscope. Well now i see similar energies, but with thousands of amps. That's so cool! You probably can power a mass driver with a single one
Transformers increase in size, in relation to higher voltages due to the amount of coils or wraps needed to create the proper amount of impedance. If the impedance was too low you would create a dead short. More coils more bigger. Also air cooled transformers are bigger than liquid cooled transformers.
Hey Chris! Your answer was the post precise. Thank you for sharing with our viewers. As promised we will feature your answer. Thank you once again.
Thanks love the channel keep up the good work.👍
Wait. Impedance has almost nothing to do with the voltage. Why is this explanation “loved”? The size increase is a few factors (like insulation/distances needing to be increased) but creating the proper amount of impedance isn’t as important. It’s important but there are ways to work around it. There’s really no way to stop a large potential difference from arcing or having corona discharge without insulation/distance.
Negative ghost rider....the increase in size is due to power rating, cooling ability, and insulation level. When a transformer is built, it's not to a certain impedance, rather a certain MVA size (or KVA, VA, etc.)... as in volts X amps on the Hi-Side equals volts X amps on the Low-side....yes, we know it's not 100% efficient...so the size of it is due to how many Watts, KW, or MW ( or more accurately VA, KVA, or MVA) the manufacturer says it will handle, while being able to stay at or below a certain temperature, and not arc internally at all rated voltage levels.....the impedance value is literally stamped on the transformer nameplate AFTER the transformer is built....how do I know this?? 10+ years of working on and around these big boys every day!!!
i could make a 12 million volt transformer that fits in my hand, size determines the power handling of the unit in Amps and its ability to dissipate heat from higher loads. For the primary coil, wrap count matters only for efficiency and to reach a certain inductive impedance for a given AC frequency.
Two factors -
1. Higher level of insulating material
2. More conductor coil to limit the per turn volt
12 gigawatts? About 10 times the energy required by the Back To The Future's time machine. Please someone call Doc, now we can do time travel easily :-D
Jokes apart, this is truly a massive beast of a transformer. Impressive.
12 GIGAWATTS! Great Scott!
Looks like some kind of death machine (electric impulse canon) X-D
I thought I clicked a rail gun video.. click baited by my own eyes.
Just like tesla .. toengoeska explosion .. ever heard of it?
From the look of it, yes! xD
@@engineeringworld.
;-)
@@jd-uo8hc same here 😅...
The tranformer need be that big because we are talking about 1100kV , that is 1,100,000 volt.
To get a voltage that high one need have many more windings compared with the primairy input.
Generators are giving power in watts, but for this let's assume we do have a generator that has 1000 volt input, then you need to convert 1 winding to 11000 windings. One winding is not enough at 1000 volt, the resistance is too low and the eddy current is not '' blocking '' the flow.
Use 1000 windings on the primary you need to have 11000000 windings on the secundary.
Resistance can't be too high . otherwise the current won't flow freely without generating a lot of heat. So the wires need sized to proportion.
The coil windings, diameters and resistance balance. The need for a big transformer.
Thank you for your detailed feedback!
Have a nice day ^_^
I have this model as an USB-stick. It was gifted to me when I was at an Info day by Siemens in Erlangen.
As a USB stick?! That sounds cool.
@@chris-hayes It's very cool. The biggest and most unpractical USB-stick I have ever seen. But It's cool.
Wow, this thing is more than meets the eye.
It's all about insulation when working at high voltage. After some point, special material are needed which makes it much higher cost, and the most obvious, the size.
Size of transformer increases with increase in voltage because voltage per turns is directly proportional to the net iron core area.
2 . As net core iron area increases the insulation used for transformer also increases
What a mammoth ! A great feat !
It looks like something out a Bond movie. Great stuff.
Optimus Prime: "So... what do you do after work, babe? [smiles]"
Looks like it'll open up a tear into another dimension or into another galaxy.
Well, it's not from a Sc-Fi movie ! xD
Photonicinduction my boii, where are you at? We need you to play with this one.
The legend is back
Styropyro would probably kill for something like this. Imagine the massive arcs this thing could produce.
I mean, if he even just had access to a _normal_ transformer, it would still be impressive. If you told me he owned one, I wouldn't even be surprised.
Photonicinduction does much more powerful things than styropyro or electroboom. British electrical engineer.
Proud to be big well done seimans.
Just what I needed to power my amp!
How many 12AX7 tubes do you have?
Transformers: More than Meets the Eye!
Gotta love some high energy electrodes, pumping out their Siemens
What kind of primary overcurrent protection are they working with? Also, what’s the impedance? I’d be curious to see the specs
ask siemens
Transformers increase in size as the increase of voltage is needed due to the amount of coils or conductors needed for inductance between the primary and a secondary. Thus more voltage = more layers of symetrical conductors needed to increase voltage.
Thank you so much Mr. Matthew for sharing your knowledge with us. Have a great day!
Marvelous !
"Locke" hat's im Griff. 💪
The higher the voltage the more turns on the winding. In order to compinsate for induction. Most likely the flux material that is a componate of the primary and secondary winding differ in thickness and surface area which effects the overall size of the transformer.
Even when it is filled with oil the 1100KV needs quite a bit of distance between the windings and the side wall of the housing
I thought it was going to be a Tesla Mammoth tank.
Good, increase the voltage and reduce the rate of flow of current,
This is a main reason to step up to 1100 kv
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More the voltage ratinh more will be the turns ratio.
Hence bigger stator structure required to fit in the windings.
Very simple, higher voltages require larger insulation, therefore the coil dimensions increase as does the transformer size.
As rating of transformer increases, higher voltage is required at its primary and secondary side. Hence, to keep flux constant (to prevent core saturation), core cross sectional area increases according to E=√2πf×PhixAxN. Hence, size increases. Also, transformer loss also increases. Hence, to prevent hotspots, size increases.
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Increase in voltage leads to increase in windings , insulation, structure etc hence increase in overall size of the transformer body.
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For this much of high capacity enarmous heat will be generated.for cooling the transformer coils are formed with copper tube.and the tubes areoil cooled to form coils big space required
The transformer size increases depends on the rated voltage because as the voltage increases the insulation is also to be increased .that's why transformer size increases with its rated voltage
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I wonder what kind of rectifier that used in this transformer
11 Gigawatts! That whats I need for my Flux Capacitor!
Wow really?
You will need a new flux capacitor!
High voltage transformer have higher number of stacking coils with thick insulation,also it need more spacing between primary and secondary windings.
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Maybe because of the high voltage generated by the transformer is directly proportional to the number of turns in the secondary coil. And the amount of current flowing through the primary coil of the transformer have some relation with the thickness of the wires in primary coil
Because the insulation size will increases when voltage level of the transformer increased, also the cross section area of winding conductor also increases when the capacity of transformer increased.....
The Chinese reverse engineered it.
Siemens & ABB transformer factory are also in China anyway.
And makes you say that?
Everyone knows the Chinese copy EVERYTHING.
I saw it on wish
I wonder what Onload Tapchanger Brand is installed inside this Transformer?
I want this in my backyard
Voltage is directly proportoinal to the number of turns in the coil. So increase in number of turns transformer size increases
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What is the cross-sectional diameter of the transmission line? 👀
Can someone please explain what the HUGE arc/spark gap terminals are for ? I read that it’s got something to do with any secondary low-side surges...Are they to dissipate excess voltage through the air in terms of heat dissipation ?
voltage of a transformer is dependent on frequency,flux,and number of turns...since frequency is fixed voltage is now directly proportional to flux and turns..since flux is magnetic field density multipilied by cross section area of core ..so to achieve higher flux area of cross section of core is needed is larger ..thus net cross sectional area of CRGO lamination increases ..also on the other hand voltage is directly proportinal to the amount of insulation...so 1100kv transformer surely needs large insulation material which further increaes the area ...all thses factors combiningly results in large transformer size
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Size increases as primary and secondary windings also increases so it requires more volume so size of transformer increases on increasing voltqge
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With transformers, higher frequency = more power density because the coupled power is directly related to the di/dt. With higher frequencies, the losses are far greater during transmission (the capacitive coupling to ground). This is why DC transmission makes sense. Generator -> rectify -> high frequency step up -> low-loss DC transmission -> high frequency inverter step-down. Silicon (and very soon enough gallium) will enable us to make smaller therefore cheaper transformers, and get lower loss DC transmission while still have the ability to step up and down.
The size increases because they have to live greater space between the windings to increase the isolation due to the higher voltages.
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More windings, more copper and I suspect insulation as well. There has to be a way to keep that voltage which rides on the outside of the conductor from going someplace it should not.
Can you research on this topic and share with our viewers, that would be a great learning experience !
Lets put a 3V motor on that LMAO😂
What do you think would happen? xD
Engineering World probably blow up the tiny diodes if it doesn’t already melt the wires before then creating massive arcs that would probably be able to melt tungsten.
In transformer, as the voltage rises the no of turns will increase in order to produce higher voltage comparatively. Thus,we need higher rating of auxiliaries of transformer. Apart from that, voltage is directly proportional to insulation to prevent from abnormalities and faults.so, it will also increase the size of transformer
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3:20 my man winked at the camera lol
To increase more voltage and current of a transformer more winding is used more voltage and rating depends on the winding used in transformers
as the level of voltage increases no. of turn ratio increases this leads to increase insulation so needs more space this factor of increases the size.
its the larger size of the wire to handle more current which increases the size of the transformer but the windings stay the same to hold the same voltage.
When we increase the voltage level then we need to increase insulation level so that's why overall size of x'mer will increase
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Good job Siemens team
As per fardays law of EMI the induced emf in secondary is directly proportional to no. Of turns. Since the voltage at secondary of xmer is 1100kv so turns also proportionally going to increase. Also insulation to this turns also takes more space,hence with increase in vtg rating transformer size increases.
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What is the effect of high frequency on transformer
I'm not going to enter into this room for any amount of money
Hey guys, yeah, the reason for the size of the casement is because the bigger the voltages the bigger the tank .
It's too with the cooling of the coils inside, the tank is full of heat transfer oi,l that's what is pasing through the cooling Finn's. So there's a certain amount of oil in the tank that is circulated around the coils to keep them at that happy running temperate. This is why the higher the voltage the bigger the tank .
can we use this to zap frankensteins monster??? thx i really would like to know if it would work.
I am EEE student proud of it😍😍😍😍
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Im ECE
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@@mololuwa170 Electrical and Computer Engineering
That thing looks like a cannon from some scifi space warship
Haha! That's a good observation, we hope you liked it ! xD
I wonder how thick the insulation on the transformers windings is!
It's amazing
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Higher voltage, more insulation, Bigger core, bigger everything.
More windings
The tank and most of the transformer was made in Croatia factory name KONČAR then transport to Germany to be assembled. I know because i was working on them,and its a pain in the but to build that monster .
What makes building this one more difficult then a smaller model? I'm assuming its more then just the physical size of it.
@@sparkplug1018 Because it empty weight is nearly 30tons,and u got to handling this monster in small space because u got more of this transformers tanks around u. That just that bit there u haw a all the other bits to fit around him to make shore that they fit. Assembly of that transformer in how we like to say in dry condition takes around two weeks without the core or oil,and if it fits and there is no leaks of air anywhere the the whole thing around the transformer is dismantling and then we transport that empty tank to paint and other bits. Sure this is just a crash cores of things that we do before transporting the tank to the other part of factory so they put the transformer core and oil into it. Last time one of this mega monster fly from Zagreb Croatia in Antonov AN225 to middle east and there's been crowd gathering to see this plane and the transformer going up in the air.
Wow! Can you please share what all challenges did you face while working on this transformer.
@@engineeringworld. Sorry, it would take to long to describe all the things that we face building that monster..
@@jebalica Samo im reci da je transportna tezina mrcine preko 500 tona. I kad im kazes koliko ovakvih mrcina treba za prijenos snage 12 GW I to pomnozis s cijenom svakog, raspolozenje naglo padne
Every HVDC article seems to be about turning the AC into DC, which is pretty straightforward. But to turn it back requires an inverter, and the highest-voltage inverter I've ever seen produced 575V AC. It seems like turning a million+ volts DC back into AC would require some ultra-volt IGBTs or transistors, or have a whole bunch of inverter stages rigged in series so that each one wouldn't have to handle the full voltage.
Correct. Think of a 400 level inverter that and all in series to give one giant inverter. If it's with igbt and a Voltage source converter then it's called a multi modular converter. Or it can be converted from dc to ac with thyristor valves then it is a LCC, line commutated converter
So is that enough power to feed the flux capacitor?
Hmmm might be enough to get me out of bed in the morning
Eddy current loss to be reduced,magnetic flux to be increased so need to increase the laminated core size as well as winding size.
With i increase in voltage thickness of insulation has to be increase to withstand that level of voltage also no of turns has to be increase.
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It has to do with energy loss dissipation; magnetic n coupling factors n that size matters
The size is related with the KVa. Increasing the KVA reduce the losses in the grid and the cost of the transmission line or Increase the capacity of the TL.
Seems like it would be cheaper and easier just to build it on site in China inside a temporary building where it's meant to be used. Kinda like a 200 inch TV, eventually you reach a point when it's cheaper and easier to get the tv first and then build the house around it.
What ratio is that beast?
Considering that plays a big factor in size, voltage per turn, current over the area of the flashing? And is this a 10:1 ratio? I would like more information about the Rectification valves used? Their huge, let alone the transformer.
Why does the transformer size increase with increase in voltage rating?
What do you think?
As the current increases the cross section of the winding conductors increase however as far as the volage is concerned:
1. The insulation thickness is increased thereby increasing the height of the core window.
2. The cores we use are limited to a maximum flux density of 1.7-1.8 Tesla and thus to increase the flux we have to increase the cross section area of the core. This is because the voltage at terminals is directly proportional to frequency of the supply (50 or 60Hz, so it is constant, cannot be changed) and the 'amplitude' of the sinusoidal flux.
Also as I read in the comments it is required to increase the reactance of the transformer which is done by increasing no of turns which also increases the size.
The tank size is designed around the coils in side the transformer. Our friends at ABB will do all the RESERCH AND DEVELOMENT AND DESIGNING of the tanks ,I know one of the boys that do that job .
So yeah the bigger voltage ,bigger the tank and the rest of some of the equipment inside the tank apart from the coils, is bigger as well .
Usually the amount of oil to cool the coils down inside the tank is worked out on fine base lines and othe facrorors,working on a maximum overload, the coils to be circulated by a curtain time round in the tank and radiators and pipe work ,at a certain rate or speed to circulate oil around coils at optimum runnig temp of keeping the coils nice and happy in there cool and thin heat transfer oil and with extremely high voltage is bolted fast shut in side .
The conservator is that nice big tank,that sits up top , and that'll only be used by the transformer tank if she decides to spring a leak or and as the oil is disapated over time via the break down of the oil from electrical currents or electrons flowing and or the magnetism generated from the voltage currents I think.
I hope I answered a question for someone out there this morning.
I love electricity but we're taking it for granted.
Thanks to ABB we have the tech's and engerneers building our transformers here in Australia. I used to weld these beautiful baby's up and I loved welding them . if I'm wrong about the oil , I'm sorry. I'd like some one to help me with this question if I am wrong . but I'm sure the oil is disapated over the time and year's that the transformer is in service wouldn't it ??
Hmm. I thought it was because it had more chocolate pudding in it.
Gotta use more oil to cool that air cooled transformer yeah you make sense, oh my
The more you increase the voltage, means more you are increasing the amplitude of magnetic flux, so you have to increase the core size for the transformer to confine maximum amount of linked magnetic field with secondary, to reduce the leakage flux and increase the efficiency, the size is bigger, moreover, the coils, turns, cooling part also has to be bigger.
A Transformer is an electromagnetic machine which has to cater for the Electric and Magnetic effects, their magnitude and their rate of change, together with their associated voltage, current, temperature, and mechanical requirements to be able to withstand the forces and stresses irrespective of their nature. Basically, there are three looped circuits one must cater for, these are in the form of a magnetic loop curling with two voltage/electric paths called the primary input and second output path, the latter two being also the input and output current paths. As far as material is concerned the electric path would require a conductive path for the current and an insulator to isolate the high electric fields while the magnetic path would require to be made of thin laminated steel to reduce eddy current effect due to the rate of change of the magnetic field in it.
Since the question addresses why the transformer size increases with the increase of voltage rating one need not talk about the power rating of the transformer due to an increase in the current where the copper primary and second coils have to be increased in AREA size. With voltage increase, it is the isolating INSULATION that needs to be better for the separating medium that will stop the electric stress breaking through from the primary to the laminated steel magnetic path, or to the secondary coil.
The transformer will increase in size due to nature with which the windings need to be done. The voltage is so high that one cannot wind one coil with the turns riding on each other multiple times as if one regards a coil as a long wire having a very high voltage at its ends, then one can not bring the two ends too close together below a certain distance as otherwise there will be an electric stress breakdown and the system will fail. Normally a high voltage coil is wound with the next turn close to the previous turn, but the turns are made to always move away from the first turn and the progressing turns are never returned to ride on the first turns of the coil. So basically a high voltage coil must have the turns progressively distancing away from the starting end so that the Finish turn in the coil would be at the greatest distance from the first turn. One must consider that since it is a high voltage transformer which has a large area magnetic path, even one turn will have a high voltage induced in it.
As far as the magnetic path is concerned, in order not to saturate the magnetic path, one needs a large area and the relation of the voltage used to the area of the magnetic path required, depends on the magnetic material used. When I was very young, with the laminated material I had 70 years ago I used to wind the coils using the rule of thumb 7 or 8 or 9 turns per volt per square inch of the magnetic path. For a short time rating I used 7 and for the contiuous rating, I used 9 turns per volt per square inch of steel. For the current path I used for Naval Purposes 1000 amperes per square inch but in nonwar issues, I used 2000 amperes per square inch of copper........ but times change and dimensions would change with the difference in better insulation, better iron magnetic steel and better copper paths.
So it is the nature of winding a high voltage coil, the need not to saturate magnetic laminations, and if it is to carry more current it has to have a larger area in the conductors used. Obviously the cooling, monitoring and protection devices for gassing, temperatures, oil or air circulation plus the mechanical strong construction required to take the weight and transport it without causing any mechanical warping of the unit, all adds up to an ever increasing in size, but for a high voltage it is the insulation and the magnetic path required that will make it increase in size.
These were my thoughts/conclusion yet somehow a comment talking about the amount of impedance won out. The amount of impedance could be 1 mH but if your primary voltage was 900 GV you’d still need an incredibly large transformer.
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Higher the voltage rating,more the the clearance required with respect to earth,tank and between phases.reference IEC
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When voltage increases number of turns increases to rise voltage and its thickness also increases due to high power
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@@engineeringworld. thank you
And we except more videos like this
How can we say a transformer which will work on HVDC
because the secondary windings are many more turns around the iron core
12 GigaWatts!! Just get how much power that is.
enough to send people back to the future
About 1,000 Amps at 1.1 Million volts.
It's simply 12 billion watts . lol
An increase in voltage rating requires an increase in clearances and dielectric strength. Since the dielectric strength of current materials is constant, size has to change in order to provide adequate clearance. This you will learn form 2nd year electrical engineering trade mathematics (in Australia ).