Folks, I disagree. The arcing did not happen because the 1.5KV touched the 25KV. It happened because the panto disengaged from the 1.5KV DC line. Maybe the LP had not switched off the motors. Notice that the transmission line on the top is contiguous. Breaking a DC circuit with inductive loads like a motor will always cause more arcing. Besides the current when on DC is much larger than on AC (25KV/1.5KV ratio approx). This also causes bigger arcs and hence the DC to AC switching is more fun to watch potentially.
LP! How could he miss that! I really should add this video to my favorites now. BTW, did not know that Kalyan has a neutral zone in the yard as well. I thought it must be after Kalyan for Kasara side trains. But I overlooked the fact that 5th and 6th lines in between Kalyan and Diva are under AC traction. Also, was there any news of any damage to any equipment inside the loco?
Yes there is a blue sign board on the electric poles to indicate where to bring down the panto and vice versa in case of a neutral zone. rest DC to AC is definitely based on the LP/ALP's knowledge as to which side is he coming from.
A little bit dangerous neutral zone, in Kutná Hora (Czech repbulic) neutral zone have 3 neutral sub-zones and our multi-voltage locomotives (classes 350,363) automatically shut off master switch, when pantograph is up and no voltage detected. Kutná Hora neutral zone scheme 3 kV = | N (20 m / 60 ft) | N (20 m / 60 ft) | N (20 m / 60 ft) | 25 kV 50 Hz Legend: | = insulator N = no voltage
Small question for anyone who can answer. How does an LP or an ALP know when to change the Panto from DC to AC and vice versa. Do they see any board informing the same?
Here also only master switch is turned off when negotiating AC-AC neutral zone but in the above case its negotiating AC-DC neutral zone and the loco had two different pantos for AC and DC
Well, I know that 25 kV AC monophase in becoming a "standard2 in the world, but It is difficult for me to understand why Indian dirigent class has decided to make such a change when DC did perform fairly well
I think it’s because it allows a reduction in the number of substations with transformers. High voltage AC makes the most sense on newly electrified lines, though. The cost savings of conversion from DC at a medium voltage are generally smaller than the savings of switching from diesel-electric (or even steam!) to fully electrified.
My goodness. What a capture? Thanks a lot Vijay. It was worth giving Palasdhari trip a miss.
Whoa :O Looks like LP was careless there. DC panto trying to take in AC will always have an explosive ending!
Amazing video. These unique electrics will be missed!
See what has LP done to this baby. Bt nice capture.
Folks, I disagree. The arcing did not happen because the 1.5KV touched the 25KV. It happened because the panto disengaged from the 1.5KV DC line. Maybe the LP had not switched off the motors. Notice that the transmission line on the top is contiguous. Breaking a DC circuit with inductive loads like a motor will always cause more arcing. Besides the current when on DC is much larger than on AC (25KV/1.5KV ratio approx). This also causes bigger arcs and hence the DC to AC switching is more fun to watch potentially.
RIP WCAM 3
LP! How could he miss that! I really should add this video to my favorites now. BTW, did not know that Kalyan has a neutral zone in the yard as well. I thought it must be after Kalyan for Kasara side trains. But I overlooked the fact that 5th and 6th lines in between Kalyan and Diva are under AC traction. Also, was there any news of any damage to any equipment inside the loco?
what was the LP doing ??? sleeping .
Yes there is a blue sign board on the electric poles to indicate where to bring down the panto and vice versa in case of a neutral zone. rest DC to AC is definitely based on the LP/ALP's knowledge as to which side is he coming from.
I think this LP was new and thus forgot some of his duties.
I wonder how extensive the damage was? What had to be fixed or replaced after this?
A little bit dangerous neutral zone, in Kutná Hora (Czech repbulic) neutral zone have 3 neutral sub-zones and our multi-voltage locomotives (classes 350,363) automatically shut off master switch, when pantograph is up and no voltage detected.
Kutná Hora neutral zone scheme
3 kV = | N (20 m / 60 ft) | N (20 m / 60 ft) | N (20 m / 60 ft) | 25 kV 50 Hz
Legend:
| = insulator
N = no voltage
"Shit!" was a bit of an understatement. An expensive cock up for sure!
Small question for anyone who can answer. How does an LP or an ALP know when to change the Panto from DC to AC and vice versa. Do they see any board informing the same?
Great!
here in Portugal, master switch is turned off, instead of lowering pantos.
Here also only master switch is turned off when negotiating AC-AC neutral zone but in the above case its negotiating AC-DC neutral zone and the loco had two different pantos for AC and DC
Well, I know that 25 kV AC monophase in becoming a "standard2 in the world, but It is difficult for me to understand why Indian dirigent class has decided to make such a change when DC did perform fairly well
I think it’s because it allows a reduction in the number of substations with transformers. High voltage AC makes the most sense on newly electrified lines, though. The cost savings of conversion from DC at a medium voltage are generally smaller than the savings of switching from diesel-electric (or even steam!) to fully electrified.
Bro it was neutral section
...
Yes bro. I know. If u see clearly, LP didn't switch off power after entering the AC zone, hence the blast.
actually what happend?
OUCH!!!!!!