Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [power-transmission]

84 questions
43
votes
4 answers

Transmitting power over long distances what is better AC or DC?

I found this answer to a related question. The part of the answer that's confusing me is: Transmitting DC power over a long distance is inefficient. Thus AC supply is a far more efficient to transmit power. According to Siemens it's quite the…
Arraval
  • 533
  • 1
  • 4
  • 8
33
votes
3 answers

Why are two wires used in railway overhead equipment?

While watching the train videos, I came across these overhead wires. After searching on the internet, I found that both catenary and contact wires carry the same voltage and are connected by vertical wires called "droppers" at intermediate points…
mech_duck
  • 473
  • 4
  • 6
4
votes
3 answers

How does my automatic car shift without complete temporary loss of acceleration

When my car shifts gears, the car's acceleration never goes to 0. I feel that there is constant torque to the wheels throughout the entire shift. How is this possible during a gear change? Transmission is Ford's 10R80
Ardalan G.
  • 91
  • 4
4
votes
2 answers

How to connect a motor shaft to a plate

I'm trying to drive an aluminium plate using a motor via a 20mm-wide 2mm-thick stainless steel tube. The tube is driven by a 6mm motor shaft via a pulley and the torque will be around 5Nm at most. Is it a good idea to attach the plate to the tube…
John M.
  • 1,033
  • 1
  • 9
  • 13
4
votes
2 answers

What's the history of the 345 kV voltage level in power transmission?

I'm interested in the history of the 345 kV power level for high voltage transmission in the United States. I've got two (and a half) questions: According to this source 345 kV was first applied in 1953 by American Electric Power. Who has developed…
Tanner Steinbuch
  • 41
  • 1
  • 3
3
votes
2 answers

Why are both conductors in a High Voltage Direct Curent powerline isolated from ground?

Picture of a High Voltage Direct Curent powerline (HVDC line) on the Læsø Island, Denmark (from Google Street View): We can observe that there are 2 conductor cables, and that both are insulated from the tower (which is grounded). Because the line…
Bregalad
  • 330
  • 3
  • 15
3
votes
1 answer

Gear Ratio of a Stepped Planetary Gearset

I was looking into planetary gearsets, and came upon the concept of a stepped planetary gearset. In the image shown above, if my input was the blue sun gear, the output was the planet gear, and the ring is assumed to be fixed, how can I go about…
Luke Fairway
  • 31
  • 2
3
votes
4 answers

How does power generation (hydro, wind etc...) account for variable power consumption?

I know in a power distribution system, the power is generated (from a dam or turbine or something) and consumed immediately. But the power consumed is variable. So how does the generation system take that into account. For example what happens to…
user7089525
  • 31
  • 2
3
votes
3 answers

Why in the construction of power transmission towers , the rods are hinged oblique?

I know if a rod is hinged at its two ends and if there is no load act upon it along its length then the forces exist only along its length but i don't see how this characteristic comes into play ?
user14407
2
votes
1 answer

Cross-drive steering transmission forward movement

The following is a diagram of a cross drive steering transmission component. The labels are in German, but my following explanations will be in English. (from https://de.wikipedia.org/wiki/Datei:Skizze-Ueberlagerungsgetriebe-Variante-B.svg) The…
Yanick Salzmann
  • 195
  • 7
2
votes
2 answers

Right angle gearbox, proper name or design

I'm looking for right angle gearbox, but everything is horrible expensive or in parts like two bevel gears from aliexpress. Where I can find or how to name transmission like this in the picture but in box case (if possible with mounting holes)? I…
rozumir
  • 133
  • 3
2
votes
0 answers

Optimum spoke shape for wheels made of solid material

Currently I am designing a bicycle sprocket to be laser-cut out of 3mm steel. Steel is heavy, so I want to make some lightening cut-outs, and I want to optimize the shape of the cutouts. I will probably make a "spoked" type of pattern to the…
BetterSense
  • 181
  • 1
  • 6
2
votes
0 answers

I'm looking for the simplest way to increase rotational speed from 120 to 5,000 rpm for a light duty device

I'm currently designing a device and want to increase speed from 120 to 5,000 rpm. Device is lightweight, hand operated, free spinning, low torque in/out. Picture a cheap fertilizer spreader from Home Depot. They increase speed maybe 2 or 3:1, I'd…
ScottHartman
  • 21
  • 2
2
votes
0 answers

Exceed 'designed' speed ratio of timing belt

I'm trying to create a setup to transfer motion from a motor to a shaft that requires a much higher torque (bi-directional). The housing is about 6 inches long and the speed ratio needed will be around 1:10 or even 1:15 and I'm looking at using a…
John M.
  • 1,033
  • 1
  • 9
  • 13
2
votes
1 answer

How much aluminum does a HV, MV or LV transmission line use?

I have accurate statistics about the total length of high-voltage (110-400 kV), medium-voltage (1-70 kV) and low-voltage (0-1 kV) transmission lines in my country, and they are: High-voltage: 22 500 km Medium-voltage: 140 000 km Low-voltage: 240…
juhist
  • 293
  • 2
  • 6
1
2 3 4 5 6