Timeline for How do large electrical grids stay in phase?
Current License: CC BY-SA 4.0
19 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 5, 2022 at 19:54 | comment | added | Antonio51 | These "banks" are called STATCOM ... 400 kV ... +/- 600 MVAR entsoe.eu/Technopedia/techsheets/… irjet.net/archives/V4/i4/IRJET-V4I4113.pdf | |
| Sep 5, 2022 at 18:24 | comment | added | user57037 | I would think that judicious use of capacitors or inductors could probably keep any two points effectively in sync if there would otherwise be a persistent phase shift between them. There would be some load dependence, but there could be banks of caps and or inductors that switch in and out as needed. Of course these would be giant inductors and capacitors. | |
| Sep 5, 2022 at 15:24 | comment | added | Criticizing Israel not allowed | Two interconnections between points of different lengths - that's because you're choosing the wrong points. If you move one point along the loop, you will find that every loop actually consists of interconnections of the same length | |
| Sep 5, 2022 at 7:32 | comment | added | user57037 | @Ferrybig we are not all talking about the same thing. This isn't the same as RF transmission line theory. I was not considering the impedance effect on the source. I am just noting that 1550 miles is long enough to have some phase shift even at 60 Hz. | |
| Sep 5, 2022 at 7:27 | comment | added | Ferrybig | @mkeith At transmission line delay of 8.3ms with a 60Hz signal, nothing interesting happens, as when the wave has traveled backwards, it is almost in sync. A transmission line of 4.15 is interesting, as an open circuit behaves as a short circuit as seen from the generator (and a short circuit is seen as an open circuit from the generator) | |
| Sep 4, 2022 at 23:04 | comment | added | user57037 | @Bergi it is not about the copper. It is about the dielectric material in which the E-field travels. For the most part, in a power transmission line, it seems like the dielectric is just air. But maybe the towers or the proximity to planet earth could have some effect. | |
| Sep 4, 2022 at 22:47 | comment | added | Bergi |
@mkeith IIRC, in copper it's only 2/3c.
|
|
| Sep 4, 2022 at 22:21 | comment | added | user57037 | What is the phase offset caused by 1550 miles? 1550 miles = 2.5 million meters. If the electric field is traveling at the speed of light (not sure it is) then it will take it 2.5 / 300 = 8.3 ms. The period at 60 Hz is 16.7 ms. So yeah, that is interesting. | |
| Sep 4, 2022 at 21:46 | answer | added | terry-s | timeline score: 4 | |
| Sep 4, 2022 at 20:32 | comment | added | Antonio51 | Hum ... >there seem to be loops in the American grid whose size is a significant fraction of this.< So, are you sure that there are "loops"? Where? What devices are involved along the loops? | |
| Sep 4, 2022 at 14:17 | answer | added | Matt Timmermans | timeline score: 2 | |
| Sep 4, 2022 at 12:49 | answer | added | Antonio51 | timeline score: 9 | |
| Sep 4, 2022 at 12:34 | history | became hot network question | |||
| Sep 4, 2022 at 11:11 | comment | added | user16324 | Power factor correction to modify the phase between voltage and current is a known art. Seems like something similar applies where two transmission lines of different lengths from the same source are joined. | |
| Sep 4, 2022 at 9:00 | history | tweeted | twitter.com/StackElectronix/status/1566350367981543424 | ||
| Sep 4, 2022 at 8:49 | comment | added | Antonio51 | "How do large electrical grids stay in phase?" The phase in the grid is not the same at all the nodes in the whole grid ... because it is the phase that regulates the need for power at one node. | |
| Sep 4, 2022 at 5:53 | answer | added | Frog | timeline score: 4 | |
| S Sep 4, 2022 at 4:34 | review | First questions | |||
| Sep 4, 2022 at 6:04 | |||||
| S Sep 4, 2022 at 4:34 | history | asked | Dominic Wynter | CC BY-SA 4.0 |