emgre.bsky.social
Software Engineer working in power systems. Rust, retro computers, music, and many things.
« J’aime les choses inutiles
Qui nous font du bien […]
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- Sylvain Lelièvre
20 posts
270 followers
30 following
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So take some time today to take a picture of your home, your office, a loved one cooking, your child doing their homework, your parents watching TV, or whatever. You'll be happy to have those pictures in a couple of years.
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The equipment you're referring to is a synchroscope, a very simple but interesting device. It usually comes with a dial that rotates left if the generator goes too fast, or right if it's too slow, to help you adjust the governor.
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Yes, that feeling is caused by the alternating current passing through your body. It's also the humming sound you hear near transformers (60 Hz is around a musical B, but flat, 50 Hz is a G, a little sharp).
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It does not. Usually, when you are islanded, there's no power from the utility, so no frequency to sync with. Your inverter will try to limit the disturbance when switching between modes. When reconnecting, it will sync with the grid before closing the point of common coupling.
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It's quite more complicated than that. To become grid-forming (to work in islanded mode), an inverter needs advanced control algorithms, it has to do protection with limited fault-current, it lacks inertia, etc. The transition between grid-forming and grid-following also requires precise timing.
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The number of poles of a synchronous generators dictates that. f = N * P / 120 e.g. a 2-pole generator rotating at 3600 rpm generates a 60 Hz frequency. You can also add a gearbox to add an additional ratio, or to adjust variable speed (e.g. wind turbines).
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You might enjoy this series: youtube.com/playlist?lis...
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As a comparison, here are data for my city (Québec City) for 2017. The bars are "car driver, car passenger, public transport, active transport (bike + walking), car and public transport". We are so bad here...
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As a tourist, Wien was really comfortable to travel in. The extensive tram system is so much more comfortable than the buses. But there's still a lot of car-oriented streets and intersections. Bikes didn't seem as popular compared to other European city I've been to.
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"The Lighthouse" (2015) by Robert Eggers. Not a movie for everyone, but truly a unique experience. A mind-twisting movie with sexual tension never seen before.
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"Promising Young Woman" (2020) by Emerald Fennell. A strong feminist movie, incredibly in your face. Very much needed in today's world.
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"Triangle of Sadness" (2022) by Ruben Östlund. A powerful satire in three acts, criticising the hypocritical rich and beautiful. All-in, no regrets. Do not watch while eating, especially the second act.
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"L'inconnu du lac" (2013) by Alain Guiraudie. A captivating suspense, beautiful scenery, simple but powerful characters, well integrated erotica scenes, I loved every minute of it.
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"The Substance" (2024) by Coralie Fargeat. An homage to many horror movies, an interesting sense of humour, and an all-in finale.
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"Nosferatu" (2024) by Robert Eggers. Go watch it in theater right now. A perfect horror movie IMHO. I also recommend the original (1922), very impressive for its time, especially the camera cuts and shadows.
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I'm using Deno Fresh for a project currently, mainly because I wanted to try it out. I like Deno for its native Typescript support. I like Fresh for its clear server-side rendering vs. client boundary. Running in Docker with nginx in front for TLS and 80 -> 443 redirect. I'm no web expert though.