5

Because they're both live Just because you see multiple wires doesn't mean they are carrying different things. They are frequently paralleled for more ampacity. It's perfectly common in HVDC lines to use earth as the return path. For instance, the Pacific Intertie does just that, with absolutely massive grounding electrodes at each end. The grounding ...


5

There are a few possible reasons. Elimination of electrolysis problems with ground connections. Elimination of variations in ground resistance. Grounding one of the conductors on the HVDC line might save money on isolators, ... Using a ±½VDC on each wire is common. If transmitting, say, 500 kV DC then one wire is +250 kV DC and the other is -250 kV DC. ...


3

these things are sold cheaply (less than $20) for bending the output of an electric drill through 90 degrees, so you can drill holes in cramped places. they can handle from 1/4 to 1/3 horsepower typically. hardware stores sell them. they are called right angle drill drive attachments.


3

Your terminology is correct, but also sometimes called bevel gearboxes. A cheap off the shelf unit is a few hundred dollars. If that is too expensive you probably won't save any money designing and fabricating the gears and housing yourself. A u-joint is a cheaper alternative. But if you are intent on making your own, Boston Gear has good catalogue parts and ...


3

TL;DR:IMHO, the driver for keeping the electrical generation closer to the hub is for primarily for eliminating -as much as possible- moving parts for safety concerns. The secondary benefit is the reduced losses. IMHO the problem is the distance and the complexity. For the following examples I will use as an example a Wind turbine with the following ...


3

Multiple Clutches Many manual transmissions feature just a single clutch between the engine and the transmission. This requires that the clutch be disengaged before switching gears, during the switch, and until the final selected gear is fully engaged. When a human is performing this operation, the clutch may be engaged for many hundreds, even thousands of ...


2

I don't know why the other answers are talking about CVTs. Maybe I'm missing something? But the basic way how automatic gearboxes achieve smooth switches is that they use multiple clutches, instead of moving / remeshing gears. For example this site shows basic structure of the 10R80: Typically the clutches lock up the sun gears of a planetary gear system, ...


2

Although probably not what you are after, there is Power-over-fiber, which is a technology analogous to "Power-over-Ethernet". To be honest, I haven't seen any devices that take advantage of this capability, although this can be because fibre optics devices are not as common (?) as ethernet devices. The idea behind a PoF system is able to provide ...


2

Tip: 'KW' is a kelvin-watt (which I don't think is useful for anything). Use 'kW' for kilowatt. (Capitals matter!) You could really simplify the problem by using the energy density of the fuel. If you look it up you should find that it's about 10 kWh/kg of petrol or diesel. 10 kWh/kg × 3600 s/h = 36000 kWs/kg = 36000 kJ/kg = 36 MJ/kg. My diesel VW does about ...


2

I think this will lead to an overestimation because you are assuming the load is 100% during the whole time (I would expect it to be somewhere 40 and 50% on average). Assuming 35 MJ/L, your calculation as it is would yield about 15 L per 100 km, which is too much. Given the average ratio of load, it would yield something between 7.5 and 6 lit per 100 km ...


1

Can you not simply take the miles per gallon value times the Heating Value of the fuel?


1

It depends on the your requirement but yes power can be transmitted through optical fiber. Optical Power can be transmitted through optical fiber like laser diode but the power efficiency is also comparatively low around 50-60%. The advantage is that for smaller distances the propagation loss is almost negligible. Although an insulated copper wire is a ...


1

What you want is called the belt's neutral axis. The neutral axis is what coincides with the pulley's pitch circle. You have to look this up for each belt, because it depends on the way the belt is made. But if this is a synchronous belt and pulley system, you are doing things backwards. The pulley profile is the established standard, and the belt guys have ...


1

When the tank is driving forward no pressure is applied to the hydraulic motor at all so the ring gears (4) are not getting rotated at all (and can move freely, albeit into different directions). Since both the ring gears (4) and carrier (3) are not stationary ultimately the driven gear (ring or carrier) will be the one with with less resistance. No. The ...


1

The formula to use is, R= Number of teeth in ring gear S =Number of teeth in sun (middle) gear P= Number of teeth in planet gears And Tr Turns of the ring gear Ts Turns of the sun gear Ty Turns of the planetary gear carrier (the Y shaped thing ) R Ring gear teeth S Sun gear teeth P Planet gear teeth $$( R + S ) ×Ty = R × Tr + Ts × S$$ $Tr=...


1

This is my point on Ferranti Effect. The Ferranti effect is a temporary voltage pulse (a “glitch”) caused by discharge of the energy stored in a magnetic field around a wire, OR it is a continuous resonance in an AC transmission line that adds voltage (but not energy!) making the received voltage greater than the source voltage at low loading of the line. At ...


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