bmack95hd
Well-known Member
- Location
- Cahone, Colorado
Some one may have posted on this before, first time I?ve seen it. Farm Show magazine. Yes that orange reel is your extension cord. Interesting just doesn?t seem practical. What do you think?
- Thread starter bmack95hd
- Start date
Steve@Advance
Well-known Member
Something doesn't add up here...
The tractor is 100kw, with 200kw available for implements.
That's 300kw. Even at 480vac 3 phase, you're looking at 360 amps, plus 20% for motor load, that's 432 amps.
Calculate the 3000 ft distance, that calls for 1250MCM wire size, x3, plus a ground.
1250MCM wire is aprox 1" diameter!!! Not counting insulation...
So that "extension cord" will be what, 5" in diameter!
Not quite what the picture is showing!
Unless they are running some extreme voltages, which would not be practical in that environment, what gives?
The tractor is 100kw, with 200kw available for implements.
That's 300kw. Even at 480vac 3 phase, you're looking at 360 amps, plus 20% for motor load, that's 432 amps.
Calculate the 3000 ft distance, that calls for 1250MCM wire size, x3, plus a ground.
1250MCM wire is aprox 1" diameter!!! Not counting insulation...
So that "extension cord" will be what, 5" in diameter!
Not quite what the picture is showing!
Unless they are running some extreme voltages, which would not be practical in that environment, what gives?
Paul from MN
Member
kcm.MN
Well-known Member
- Location
- NW Minnesota
Let me guess, April issue? (April Fools Day?)
The longer your cord, the more line loss you have. You couldn't run a handheld circular saw through the full length of that cord!
If I had to guess, I'd say Deere might've done this as a silly means of advertising.....and apparently it's working. Folks will see the tractor and the cord, will show it to their buddies, and they'll all discuss their personal views. Many will wonder if Deere has figured out how to transmit electricity through something other than copper extension cord. Many will scoff at the idea, wondering how many band aids that cord will need. Still, it'll have folks talking about John Deere, and good or bad, it's still putting the company name in people's heads.
The longer your cord, the more line loss you have. You couldn't run a handheld circular saw through the full length of that cord!
If I had to guess, I'd say Deere might've done this as a silly means of advertising.....and apparently it's working. Folks will see the tractor and the cord, will show it to their buddies, and they'll all discuss their personal views. Many will wonder if Deere has figured out how to transmit electricity through something other than copper extension cord. Many will scoff at the idea, wondering how many band aids that cord will need. Still, it'll have folks talking about John Deere, and good or bad, it's still putting the company name in people's heads.
buickanddeere
Well-known Member
High voltage DC would be the preferred supply .
Bet 480 3ph. Nothing else would have enough umph. Ralroad cars are very close. Way back in the old days they were 36 volt with belt driven generators from the wheels and a closet full of Edison batteries. Reliability kept getting better and much more power was required by the systems in the cars. Today most everything is 480 3ph. If you read about what the rest of the world uses on rail cars you want to laugh. The Pennsylvania Railroad overhead power lines were originally 25cycle frquency. Not anymore. Some stuff in Europe runs at 16 2/3 cycle. The more you read there are even more crazy things.
Steve@Advance
Well-known Member
There's the secret at 0:20, 2500 volts!
So add a boost transformer power supply to the 500 amp service that has to be added wherever the tractor is used!
So add a boost transformer power supply to the 500 amp service that has to be added wherever the tractor is used!
Absent Minded Farmer
Well-known Member
- Location
- Gehl Country, Wis.
That reminded me of one of the electric switchers down at the Illinois Railway Museum. The extension cord spool is behind the headlight & there's a pole with a metal hook on the side of the cab under the window. The hook on the pole is on the opposite end from the camera. They would take that & hook it on to the overhead wire or dedicated hanger so they could switch out un-electrified sidings. The North Shore (Chicagoland area) had two battery equiped units used for the same purpose. I believe they ran 600 or 660 VDC in their wires, without looking. TM also.
Mike
Something you don't want to do in rainy weather. You see line men working with fiberglass poles and woven blankets and rubber gloves and high reach trucks with fiberglass booms.....and there are times it still isnt enough. The old trolley cars have a pole at each end. When you reverse the car you have to get out and swap poles end for end. The reel had cotton rope like clothes line and a spring recoil system. Had a porcelain insulator at the end. Electricity just loves wet stuff.
Kansas4010
Well-known Member
Big Brutus is electric. I went there a few years ago and it sure was something to see. It wasn't the biggest but it is the biggest around here. The "extension cord" that powered it was as big around as my arm.
37chief
Well-known Member
- Location
- California
I wonder how many splices the cord will have in a few months? Stan
Athol Carr
Member
It not a new idea, tried on the Kemp tractor in mid-Canterbury, New Zeal;and in the 1930s. Initially on Hart-Parr tractor frames, but also on a Caterpillar. Cable connected to transformer on truck nearby. The 8 tractor built put in about 8000 hours work between them. However, kerosene, at the time, was a cheaper fuel.
Kemp tractor with horse team,
Kemp Tractor
,Conversion on a Caterpillar
Kemp Tractors
David Snipes
Member
How do you drive it down the road to the next field a mile away?
kcm.MN
Well-known Member
- Location
- NW Minnesota
Wow. No, it's not a new idea. Almost looks like John Deere took ideas directly from those images.
Speaking of old ideas being new again, check out the "Extra" Pic tomorrow. Was gonna wait a while longer to post it, but no time better than this!
Gene Davis (Ga.)
Well-known Member
The first electric drag line in our area was for mining Kaolin. It was supplied by a large bank of transformers that fed it 4160 volts. The power cord supplying it looked to be about 5 inches or so in diameter and was not laid on the ground but had nice insulated thingys holding it up. They drove a jeep into the bucket one time demonstrating the size of it.
Then another local Kaolin mining company had a huge electric drag line that also ran on 4160 volts. I went by it one day and there was a guy that was standing on the hood of a D-8 cat doing something under it.
Gene Davis, (Ga.)
Then another local Kaolin mining company had a huge electric drag line that also ran on 4160 volts. I went by it one day and there was a guy that was standing on the hood of a D-8 cat doing something under it.
Gene Davis, (Ga.)
MJ in the UK
Member
A friend of mine used to work as a field engineer for Ruston Bucyrus in Lincoln UK. One day he was telling me he had been to America and seen some large electric walking draglines working at a quarry. They were drawing their electricity from two local towns and when the operator pulled the bucket full of gravel it put all the lights out in both towns. MJ
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