Questions tagged [electrical-grid]
The electrical-grid tag has no usage guidance.
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Why does it take so long to restart a nuclear power plant?
I have heard a couple of times that an operating nuclear power plant which was shut down (non-emergency; e.g. for a regular check) needs over 24 hours (up to 72 hours?) to get up running again.
Why ...
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What are the disadvantages of concentrated solar thermal power?
Concentrated solar power looks on the surface to be an excellent source of grid power. It's sustainable, has no obvious waste products to deal with either during construction or operation, and with ...
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Why shouldn't we put high voltage cables physically underground?
sorry for the odd title. We're working on a project to find a cheaper and safer way to install high voltage power lines in the Scottish highlands. One of my group mates had a really cool idea to ...
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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 ...
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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 ...
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Why aren't gravity batteries everywhere?
The problem of energy storage, especially with regard to renewables, remains unsolved. Or at least there do not seem to be any popular solutions.
Why not gravity batteries?
I love the idea, and they ...
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What is the specific issue with frequency fluctuation in the grid?
I understand that if supply and demand are not in equilibrium synchronous generators make the difference by increasing or decreasing their rotational energy - thus changing the electrical frequency in ...
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Why 'battery storage power stations' use mainly liion batteries?
As I understand liion batteries have lower lifetime, than LiFePO4. Why would such big stations use liion batteries then? Wouldn't replacement cost large amount of money? And how long those liion ...
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What, roughly, are the characteristics of nuclear power in grid management?
Electric grids are volatile: As there's close to no storage capacity, power in must equal power out all the time.
One part of the management toolset is the various power sources attached to a grid. ...
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Expected power increase when replacing old (>20 years) wind turbines [closed]
Plenty of onshore windfarms around the world are reaching the 20-25 year old mark and thus may be on the process of repowering.
Let's say an old wind farm has 10 rotors of 0.5 MW each (total power <...
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Simple clarification about EV charging
After reading some docs about Electric Vehicles (EV), I learned that there are 4 differents charging modes.
For example, let's consider a slow recharge, where EV is connected to a single-phase ...
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What fraction of energy is typically lost in transmission over power lines?
Energy transmitted via power lines necessarily undergoes some degree of attenuation. The question is, how much?
This source, screencapped from this video, says:
But, I've heard via word-of-mouth from ...
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What happens if an entire country turns off all lights and electric devices during peak consumption hours? [duplicate]
I've been reading about smart grids but I studied Computer Engineering and my already limited knowledge of power systems is very rusty. I keep hearing that traditional power stations have to adjust ...
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How to solve power surge caused by curing oven PWM cycle?
I have a Despatch LBB 1-69 lab oven in my shop. It is a single-phase, 110-volt, 30-amp unit. It is wired to a 220 volt, 2-phase, 40-amp panel (on a single 110 volt phase), which is fed by the 100-amp ...
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At what cold ambient air temperature will power lines fail?
I'm wondering just how cold it would have to be before electric power can no longer flow through overhead power lines. I know power lines generate a certain amount of heat just as a side effect from ...
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natural gas-fired power plants
I live in Tunisia, a country of 12 million inhabitants where natural gas (provided essentially by Algeria) is used in power plants. I'd like to know how it is that natural gas can contain so much ...
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What does "shuffling" mean in the context of electrical grid power distribution?
What does shuffling mean in the following context and to what does "it" refer in the phrase "it is shuffled"? Should "it" be "they"? Are the three phases being ...
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Can the power of a diesel electric generator, installed in a factory, escape into the national grid?
Say that there are two factories connected to the same 20 kV medium voltage line (see Fig. 1). Each of them has 400 V motors that consume power by turning some machines acting as mechanical loads. One ...
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Lead Cladding on Telephony (landline) copper cables. Any other early industrializers with this problem?
A recent environmental hazard has just been uncovered this past week by the Wall Street Journal:
"America Is Wrapped in Miles of Toxic Lead Cables"
https://www.wsj.com/articles/lead-cables-...
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Do high votlage transmission lines disturb other electrical devices?
I had the question myself it those high voltage transmission lines, disturb other electrical devices? Let's say I have an high voltage next to a mobile basestation, does it effekt the electrical ...
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For Electric vehicles, HOW are miles per gallon equivalent (or L/100 km) are calculated, accounting for different sources of energy in the grid?
Could someone giver a clear and authoritative answer on HOW miles per gallon equivalent (or L/100 km) are calculated for battery electric vehicles like the Tesla Model 3 AWD long range?
On the ...
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Genetic algorithm implementation for gas/power/water network operation optimizaiton
I have both practical and theoretical background in power, gas and water networks operation and I am familiar with the basics of genetic algorithm. I would like to dive into the network operation ...
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Power consumption of mining rig? [closed]
I plan to buy a mining rig, with 750 watt PSU. It will be turned on for 24/7. I had like to calculate, how much kw/h will it spend per month?
