Questions tagged [electrical-grid]

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20
votes
5answers
10k views

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 ...
12
votes
7answers
5k views

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 ...
4
votes
4answers
258 views

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 ...
4
votes
1answer
820 views

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 ...
3
votes
2answers
403 views

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 ...
2
votes
1answer
44 views

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 ...
2
votes
0answers
30 views

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 ...
1
vote
4answers
510 views

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 ...
1
vote
2answers
63 views

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. ...
1
vote
2answers
71 views

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 ...
1
vote
2answers
78 views

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 ...
1
vote
0answers
46 views

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 ...
0
votes
1answer
437 views

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 ...
0
votes
1answer
53 views

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 ...
0
votes
1answer
56 views

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 ...
-4
votes
1answer
75 views

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?