41–50 of 70 posts
https://en.wikipedia.org/wiki/Synchronous_grid_of_Continenta...
Note how Denmark is split between two separate synchronous grids.
There are lots of high-voltage DC connections between the grids in this map.
What does it actually mean to disconnect? Is there some physical connection being broken? How is that done?
Yes it's some physical connection being broken. It's not unusual to adjust the ways in which the electrical grid is connected. See https://www.youtube.com/watch?v=7Q-aVBv7PWM from Practical Engineering which talks about some of the nuances of building switches which can break connections between different parts of the grid safely.
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Off-topic; Why does America use 60Hz? I've never found a satisfactory answer.
> They were disposed to adopt 50 cycles, but American arc light carbons then available commercially did not give good results at that frequency and this was an important feature which led them to go higher "The origins of 60-Hz as a power frequency" https://ieeexplore.ieee.org/document/628099 Better question is why did Germans pick 50 Hz, I'm not aware of any comparable benefits of having lower frequency
In the end, there is no real difference between 50 or 60 Hz, there is no clear advantage to either, especially with modern components. But you do have to choose as the whole network is synchronous.
On Saturday (8th of Feb), Baltic countries will disconnect from the Russian power grid and synchronise with the Continental European electricity system. They will operate in "island mode" for 33 hours, and then synchronize with the European grid frequency. The frequency is a key parameter of the grid. If there is too much load, it goes down, and if there is too much production it goes up. A lot of critical grid infra…
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A better question is why does Japan use Both 60 Hz and 50 Hz in different areas? And that’s really just a legacy from early decisions at different companies when the grid was first introduced, and there’s never been a sufficiently compelling reason for either to swap. 60 Hz is slightly better in terms of flickering, but neither has enough advantages to really be a determining factor on their own.
US did the same, Southern California was 50 Hz at first. It didn't convert until after WWII
https://www.lifebynumbers.ca/history/the-rise-and-fall-of-25...
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It's possible to transfer power between two grids at different frequencies (even between 50 and 60 Hz), it just requires more expensive equipment.
There's by now a lot of DC links in Europe for example going from the European continental grid to the Nordic grid. Denmark is split between the two so it has a country internal DC link too.
DC links solve a myriad of synchronization problems.
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This would require both grids to be exactly synchronized.
It's possible to transfer power between two grids at different frequencies (even between 50 and 60 Hz), it just requires more expensive equipment.
Earlier quoted context omitted.
US did the same, Southern California was 50 Hz at first. It didn't convert until after WWII
There was 25 Hz infrastructure in Ontario until the 1950s https://www.lifebynumbers.ca/history/the-rise-and-fall-of-25...
Earlier quoted context omitted.
Off-topic; Why does America use 60Hz? I've never found a satisfactory answer.
> They were disposed to adopt 50 cycles, but American arc light carbons then available commercially did not give good results at that frequency and this was an important feature which led them to go higher "The origins of 60-Hz as a power frequency" https://ieeexplore.ieee.org/document/628099 Better question is why did Germans pick 50 Hz, I'm not aware of any comparable benefits of having lower frequency