Shorter*

Ummmm

Shorter **

Everyone is correcting your misspelling but no one is pointing out the lack of an indefinite article before the word "video".

seems like copper was burning according to flame color.

@@user-ne3rb8ps8j Пламя - это образование плазмы в ходе реакции окисления. А это разрыв высоковольтной цепи по воздуху. Вы можете сказать о зеленом цвете дуги, но не о пламени!

Those cars were horribly unreliable so this wasn't really surprising

Hot air is also more conductive, and that's why the arc of a Jacob's Ladder goes up, until the arc is extinguished, then it starts from the bottom again.

@@buddyclem7328 I also think the black steam by the locomotive is very conductive because it obviously contains a heck of unburned carbon particles that together with high humidity seems to be very conductive.

@@paulg.3067 That would definitely be true!

@@buddyclem7328 It is not hot air but plasma, not the same...

Dude, are you train engineer or smth? I'm seriously impressed by your knowledge on electric train.

The Student Official I am actually studying IT and I do not drive trains in real life. Electricity and electric trains are "only" my free time hobby :)

Brilliant analysis. My only thought on the low voltage protection in the last clip is that it may be an entirely different class of locomotive operating on a different voltage system? It's too dark to tell, but that's the best conclusion I can come to.

Aaaaalllrighty then

I believed that driver should first switch off main switch and then lower the pantograph. The last video lookss like an insulator between sections

Not 50hz

~25kV 50Hz. Period. Bulgarian lines are electrified with. These locos shown in video are Škoda made locomotives, first derived of ČSD class 242, second ČSD class 210, both one current system, AC 25kV 50Hz locos. Here You are.

@@janpf0624 really I thought 16 1/3 hz. But thanks

@@Lukas-gp5rv I don't think 16Hz is still in use anywhere anymore. With the frequency that low the magnetics (chokes, transformers, motors, etc) are 3x bigger than 50Hz for a given horsepower, less efficient since weight is a bad thing when you are constantly carrying it with you. Only reason it was used in the first place was to extend the life of motor bearings and such (1/3 50Hz speed) given the materials and alloys of the time.

@@fvckyoutubescensorshipandt2718 It is in Germany Austria Switzerland Norway and Sweden. Other countries have had systems in the past. But as you say 25kv AC at mains frequency 50/60Hz is the preferred standard. Ethiopia and Tanzania for example with their new Standard Gauge systems are using this for power supply

kzfaq.info/get/bejne/kNeWgdef25rdgZc.html Maybe something like this, but with more zapping!

😗😊😗🥶🥶

✋🖐💚💯

^^ When you don't understand the language a comment is written in but you want to reply ^^

Probably sort of the same. I'm not sure why these arc as much as they do because it probably means there are circuits drawing power through the pantograph. When driving it's common practice to switch off traction, lower the pantograph and after raising it and getting a stable voltage re-applying traction. Trying that thing with traction might result in an arc, but as the vehicle is moving it might be difficult for the arc to sustain itself and get quenched rather quickly.

And give the line crew a big ol' headache. You can melt and break the wire by doing that.

stunner men

No need to do that when you can just run a 3rd rail train in the snow. They always end up sparking

@@Lightning_MikeNo it wont melt or just break like that. If you lower the pan while it's running it will create a big arc liek a 25kv arc that is very loud, It wont damage the wire. It will only make a small burn mark on the pan and wire

@@LubckeEnjoyer Depends how long you keep it. Short durations can still damage it

I wonder how 16⅔ humming sounds like🤔

16.7hz?? that's is too low,it will short circuit any inductor instruments,for what purpose 16 hz

@@wannawan8431 To avoid Arcing on the Brushes of Series Motors, thus reducing Wear. Higher Frequencies cause more Arcing, and all early AC Systems use low Frequencies for that Reason. Germany, Switzerland, Austria, Sweden and Norway agreed to standardise on 16 2/3 Hz some 100 odd Years ago. Using precisely 16 2/3 Hz instead of e.g. 15 Hz (very early Systems in Germany) or 25 Hz (Northeast Corrdior in America) may seem a bit weird, but the Reason for that odd Number is that it helps to power the Rail System from the Main Grid, as it's 1/3 of 50 Hz. You can just use Rotary Converters with thrice as many Fields on the Mains Side (Motor) as on the Rail Side (Generator). If you're not familiar: A Rotary Converter is just a Generator driven by a Motor, used to generate AC from DC or vice versa, or to change AC Frequency as in our Example. Later AC Rail Systems use 25 kV 50 Hz, as you don't need the Frequency Equipment, the Iron Core of Transformers can be just 1/3 the Size as of 16 2/3 Hz Transformers, and the higher Voltage (16 2/3 Hz is 15 kV) needs less Copper and less Substations.

its worth mentioning that 25 kV AC electrification at 50 Hz started to be introduced en masse in the mid 1950s in France, whereas the 15 kV AC at 16,7 Hz network in Germany, Austria, Switzerland, Norway and Sweden was introduced way before that...

In Russia, too

Same over here

This loco pilot forgot to disconnect and after that Pantograph should be lowered

In India too, we do same. :)

Even if you forget to switch off master circuit breaker, arc should be minimal if you cut power to motors and auxiliary equipment (coolers, compressors, train heating, etc.)

Andrei Cioaca This is Bulgaria Bulgarian state railays Loco series 43 00 44 00 61 00

În sfârșit ai renunțat la Forumul Prostovanilor.

Translation: The train left the fire behind! (or) The train ignited fire on that thing!

@GOOD^_^ Omg rip english 😭😭😭😭😭

types of electric arcs? it's just arcs, it's all the same, just different voltage, current, frequency, etc.

That's a Line-Insulator (allthough I have to admit that is a literal translation from the Dutch 'LeidingOnderbreker') It is used at points where two different sections of overhead wiring meet eachother. One of both ends can be grounded or even be at a different potential and to be able to have a loco drive underneath them without causing a short, this insulator is there. Most of the time it features a gap between both wires with thick metal strips shaped in a V. An arc that starts will automatically want to go up because heated air is ionised easier. Once the arc climbs to a certain point, voltage is most likely insufficient to get the arc going and it quenches. There is a video from the Netherlands where they tested this and drove under different situations (25 kv - 1500 V / 1500 V - zero) with a test-loco to see what would happen. kzfaq.info/get/bejne/bJ6qotabm72cp6c.html

it will be very tasty

Most likely lack of electrons in your organism.

pothav ra

You'll turn into flash like Barry

It will be an electrifying experience. You will really get a charge out of it.

Normally, a pantograph should not be lowered under load. Try to look at it like you are powering a few washing machines or tumble dryers and you suddenly flip the switch while every machine is drawing as much current as possible. It will arc, but because the voltage is low, it won't be such a bad arc. In this case, their is clearly quite a load present, while normally trainheating, lights, airconditioning and such is powered down before lowering the pantograph, leaving lights to the batteries and heating/ventilation off, until the pantograph is raised again.

In most countries, the main circuit breaker will switch off automatically, when the pantograph is starting to lower. So it is normally not possible, to get an arc flash by lowering the pantograph.

Not really, it is common practice for example on 3kV DC line to lower the pantograph without opening the circuit braker. But the loco must draw minimal current before this (no traction current, passenger coaches powered off etc.). There are many places, where you have to lower the pantograph, so this extends lifespan of circuit breaked and reduces time of this operation. And modern machines with automatic circuit breaker switch off have problems on this kind of infrastructure cause it takes a loads of time (about 2 minutes) to accelerate after this. Also main circuit breaker lifespan is affected. But in this particular case, it is on 25kV AC power line, and there you really must open main circuit breaker before lowering pantograph because of the magnetization current of the transformer.

Standard procedure in my country India is to open circuit breaker, then lower the panto. Earlier we had 1500 and 3000 V DC systems but now we use 25 KV AC 50 Hz.

@@accatenary DJ open Disc joint

Although what you said it true to some extend, but still sometimes there is a arcing sound even when pantograph is raised and lowered and circuit breaker is closed. I saw one such video of WAG7 bankers at Lonavala station. :)

Even the last locomotive is powered by 25 kV 50 Hz network

Commenting

Thought they would have isolated the load before lowering ,unless they like arching!

KC9UDX CQ CQ 74s and all that shit

Of course they wanted it, that's why they recorded that. Everybody like arcing! :)

It's because it's not the right thing to do. Normally, train-heating/airconditioning, lights and so on is powered down first before the pantograph is lowered. This is either done on purpose or the author knows that some drivers/shunters have a rather spectacular style of lowering the pantograph. As these arcs are very hot, it damages both the wires and pantograph.

25 KV *50Hz pantographs are never raised, or lowered in load condition. CB has to be opened before that.

It is clear that the pantograph is pulled down when the Traction Motor cooling blower is running Causing huge plasma arcing.. Because of there is lack arc chute/extinguisher mechanism in pantograph catenary system ,it must be lowered and raised in no load condition...

@@abdulwaheedsayed5246 you do realize 60Hz exists right? 60Hz in US, 50Hz in UK, idk about india. Heck there's 400Hz on aircraft, 25Hz somewhere I heard for some of the trains.

It's for efficiency.

Its not normal to use both, and there are two for drag related reasons.

On DC electrified lines, it is common to raise both pantographs if fitted, to reduce line contact resistance. There are no phase changes at neutral sections to worry about in that case. DC is typically at 700-3000V depending on the line, so the insulators are quite small. On AC electrified lines, raising both pantographs simultaneously is a Big No, because the two will straddle any neutral section and form a short-circuit between the two power phases supplying different sections of the route. Normally the one further from the leading cab is raised, and the other lowered. AC is typically at 12-25kV, so the insulators are relatively large. An arc-quenching circuit breaker is normally fitted in line with the pantograph, and is automatically opened before the pantograph lowers. Bulgaria is one of several countries using 25kV 50Hz AC. Finland and the UK also use that standard; some British electric locos (ex Class 87) now run in Bulgaria.

In India, in India, in India. The world doesn't turn around fucking India.

Sourav nicely said

That's basically a normal procedure, dont understand why these guys like to play batman

Vacuum switch (where arcing is far less likely to occur) in the train shuts off the catenary before it's lowered so there's no chance for an arc to form. At least that's what is used on some trains.

Jed Robertson I’ve seen in the Stamford yard about 6 years ago someone raised the pano and it arched as it bounced to make contact

They cut running power and the pan is made to drop fast. Another way is making contact with the other source of power before you lose the first.

Bulgarian Railways, BDZ

Bulgaria

You can still draw arcs with like 1000V AC (even DC), heck even 500V. Or 240V. Or 120V. Even a several volts creates an arc, it just makes that little spark, it's pretty much a VERY tiny arc, and does it pretty much instantly.

@@trenthighvoltage Pretty much here you mainly get smaller/shorter but very powerful arcs because of the high amount of current our trains and trams draw when accelerating! :)

@@Techno-Universal Yeah because lower voltage and higher current, while this is higher voltage lower current, usually.

Glockengießer does the lower frequency help prevent arcing?

+Brent Boswell - The lower frequency is technical based at the power station generators, because there is a special circuit of the coils, which make it possible to get 50Hz for the normal electric network and 16.667Hz for the railroad. I think, it is the voltage because in Germany we have a 15kV railroad net. Other railroads use 20kV or 26kV with 50/60Hz. Higher voltage is more able to make an lightning arc.

I heard from another KZfaq video many years ago that they use that frequency because old DC train motors can run on that with not too much problems.

Yes, that is the real reason. At low frequency, the DC motors can run on AC and there is no need of onboard rectifier, which was a problem at the time when the railroad electrification in Germany occured. At 15 kV you have the benefits of higher voltage without rectifiers but you have to use havier transformers. The arc also have less stability at low frequency and voltage. The 16 2/3 Hz is exact 1/3 of 50 Hz which makes converting possible with one common converter or motor and generator on one common shaft. With removal of all the rotary converters, some countries changed to 16.7 Hz. Most of the other countries with early electrification decided to use DC with stationary rectifiers or AC-DC rotary converters.

Perhaps you and other people have answered my question above. The Metro-North New Haven Line is actually 12.5 kV north of Mount Vernon, NY.

AC 25kV/50Hz

Probably 25000V.

Because they don't lower the Pantographs under Load but disconnect the Main Breaker inside the Locomotive first. Pantographs can't deflect the Arc safely, thus it's bad Workmanship to lower them under Load.