Traction Motor GOES KABOOM Over Diamond | Rail RECAP
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- Опубліковано 11 жов 2024
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TIME STAMPS
0:00 Video Start - Розваги
Traction motor flash over. Never heard of that, will look into that.
For an AC motor to flash you only have a couple of possibilities. Either you have a loose wire on the end turn of the motor and it bounced down and smacked the rotor while it's spinning which should cause a momentary ground fault. You could also have broken rotor bars on the squirrel cage rotor, but those tend to spark all the time under heavy load, or finally, the input wiring to the motor itself isn't secured and the 3 phase power either went line to line momentarily, or went line to ground which is pretty much the same thing as the first scenario only at a different location. As long as it isn't shorted and is still making good mechanical connection, and you think you're not going to hit anything else to make it mad, you can continue on to get it to the shop as soon as you can. I don't know if the RR would go for that, but as an electrical engineer I've had to do worse to make it through emergency operating conditions before a motor could be swapped for a spare.
On both EMD as well as GE AC traction motors, there is no physical connection to the rotor. The rotor turns as the result of magnetic forces developed by electrical current flowing thru the stator coils. Trying to guess where these sparks are coming from is at best, a hypothetical guess. It may be electrical, it may be mechanical.
@@TBlackMktg Yes... that's what I said... I'm tending to think this was an electrical fault because the second truck had smoke coming out of it too, and those locomotives have 2 traction inverters.. and they aren't split front rear, but rather a mix between the two trucks (which I personally think is dumb, but whatever). So if something went bad in the inverter, and it put say full bus voltage on the motors, that would make them smoke.
hello live trains & it's is randy and i like yours video is cool thanks live trains friends randy
Thanks for watching!
In the olden days, some locomotive manuals recommended reducing the throttle at diamonds... apparently for this reason.
Scotty gave it too much power.
Wasn't Me! I swear!
JLCX2049 - nice. Built in 1961 is what I’ve been able to find out. Like - really? Almost older than even me!
3:04 Before watching this video, I watched one on Wide World of Trains where it showed CSX 1776 on 11/6/23 going through Dunkirk NY.
Looks scary, I hope they get that AC4460 repaired. It looks recently repainted too, so maybe. How long was the train stopped?
It recently got rebuilt and is now classified as an AC4400CWM. So to see something like this happen on a rebuilt loco is strange.
@@rickyrodriguez9172 look at it like this. UP 7511 was an AC6000 that burned right out of the shop, GE bought it right back and gave UP another 7511.
I used to drive electric powered passenger units in the UK. The electric motors were wired in pairs, so if one failed you always lost two. That's probably why two motors blew on the DPU.
I don't know what went wrong never heard that in 40 years working around them . I do know or believe the engines to be in idle positions when going over the crossover it seems something flew out of the leading troubled engines and for them to start smoking at the same time was new to me as well.
That's only for DC traction motors.
Is it possible that the traction motors were in series rather than in parallel and the extra current just smoked something?
Looking forward to seeing a few expert explanations regarding the A/C traction motors flashing over.
A flashover occurs when the brushes in the commutators of DC traction motors touch each other because of a unusual movement or bump, such as when a locomotive goes over a grade crossing. If the brushes touch each other, an electrical short can occur almost like a lightning strike. Obviously, this can severely damage the traction motors. Locomotives with DC traction motors must have the throttle reduced slightly when going over a grade crossing to reduce the risk of a flashover. Newer locomotives with AC traction motors have no commutator brushes and therefore do not have to be throttled down at grade crossings
I got this from a forum
@@AbelG8781 So as an electrical engineer that actually does industrial motor control, your explanation is kinda right, but needs a few things cleaned up. Number 1, 1 motor 1 commutator. That's it. The commutator are the flat brass connections that connect the rotating rotor wiring to the stationary frame via the brushes. You've seen these on all kinds of DC motors, they're pretty much all the same. What can change is the number of brushes making contact with the commutator. Your electric drill generally only has 2 brushes, these motors might have 4, 6, or 8 pairs (a plus and minus) of parallel brushes spaced equally around the commutator. You put them in parallel to handle more current (safety in numbers) and the additional pairs allows you to electrically split the rotor and stator magnetic circuit to get different torque and speed characteristics out of the motor. So Number 2 is that the brushes don't hit each other because the are geographically isolated from each other on the commutator, like top and bottom, like your drill would have. The flash occurs when the entire motor assembly receives a mechanical shock (bouncing over the diamond or grade crossing) and when that happens, sometimes the springs that physically press the carbon brushes against the commutator will not have enough tension to keep it making contact, and the brush momentarily bounces and breaks contact with the commutator. Highly inductive DC circuits do not like having their current flow interrupted like this, so what happens instantaneously is the voltage spikes up and creates an arc between the brush and commutator face. This is no good. if it's small it will just make a puff of smoke as it burns some carbon off the brush... if it's a high current high load condition, it can evaporate the brass off the face of the commutator and leave a divit that now on every revolution, or passing of a brush will act like sand paper and start eating the brushes on every revolution. If it's severe enough and the arc persists, it can even damage the brush holder too, and then it really goes downhill fast, and you're headed to the shop.
@kleetus92 WOW. Thanks for the info! I can easily wire up a layout for DCC but I'm certainly not an electrical engineer lol I wonder if the loco gets bad-ordered right away?
@@AbelG8781Not sure to be honest, but it would likely depend on the results of the immediate inspection, or bringing mechanical out to go through it.
are you recording it from the sercurity cameras
Where was the kaboom? There was supposed to be an Earth shattering kaboom.
flash-over a term for the unknowing. potential: ground falt from lead wires in junction box far more likely --- fixed many in my day, same with ship's generators output leads.
Maybe I am presuming more than available evidence would support, but I am going to presume that Westinghouse Electric & Manufacturing Co. of East Pittsburgh, PA, are not to be counted among those who are unknowing: flash over, also written as flashover, has been a term in railway operating and manufacturing use for about as long as there has been electric traction. I have here in my hands right now the 1925 edition of Westinghouse Electric & Manufacturing Co.'s little book "The ABC of the Electric Car" by J. S. Dean, and printed by The Eddy Press Corporation, also of Pittsburgh. (Hmm, eddy, there's another electrical term) Bottom of page 64, "Extreme care should be taken by those handling electric cars not to reverse the motors and notch up the control while the car is in motion, as it is very dangerous and likely to cause the motors to flash over to ground and do considerable damage."
And secondly, sometimes it is debatable how much of a legitimate reference the US federal government counts as, but, anyway, from Federal Railroad Administration document FRA/TTC-81/08, titled "AEM-7 Locomotive Testing at the Transportation Test Center", the table of contents offers, "9.0 Traction Motor Failure" which contains, "9.3 Traction motor flashovers" on page 103. There we find, "9.2.3 Brush Holders" and right below it "9.3 Traction Motor Flashovers" which begins, "A traction motor flashover is indicated on the overhead fault panel by a traction motor overload light, a traction motor fault light and a main circuit breaker open light. If the motor flashed to ground a traction motor armature ground fault light would also appear." A few graphs and paragraphs later, "In the opinion of the ASEA engineer, the initial flashovers were due to copper dust residue from the grinding process."
i am a novice. Why 7 locomotives? are they being tranported elsewhere??
yep... they string a bunch together but will only have a few online running... the rest are either shut down or running but in idle
KABOOM? Come on, that was no more than a bang at best.
*Detector Alarm* Defect Detected!!!! *Break*
What I can tell you is this,something happened with all certainty.
Dont tell me another derailment
No, a traction motor on a DPU unit just blew out
There are an average of 3.5 derailments every day in America. Google it.