@th wth does 160v/15Hz?? We have 'variant' plugs for odd voltages; e.g. one pin at a different position to stop people plugging random things in.
@th Woah! where did you find that?...
I'm aware of 400Hz on things like ships / aviation, but 15Hz?! ... I'm guessing rail from your other recent posts?
@th ... I also wonder how you select voltage/frequency and waveform... is it just random / could it change at any time? 😱
@attie this is on the IC train from Osnabrück to Amsterdam, which switches engines at Bad Bentheim from 15kV AC in Germany to 1500V DC for the Netherlands. maybe it depends on the catenary input?
@th @attie Apparently https://en.wikipedia.org/wiki/15_kV_AC_railway_electrification 50/ 16.2/35Hz/16.7 is common in Germany; (50/3) - but wth is this thing based on 60Hz and 60/4 ?
I wonder what the origins of these systems are, perhaps the railways generated their own power?
Surely it's a pain to produce now?
... too many questions!
Not to mention all the others (25, 40, 45, 50, 60 Hz)
The answer to the first one is: because 3 phase synchronous motors were the most practical solution for a time (no need to worry about brushes, just switching how coils are connected in a given mode of operation).
This is an endless cave system of fractal paths that can take you to a lot of useless trivia about anything from alloys used in overhead electric wires through cart suspension design, different breaking systems, couplers, to communication systems which are their own niche.