4 ms·

https://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_power_system https://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_powe... predates standardized 60 Hz

https://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_power_system https://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_powe... predates standardized 60 Hz, and still hasn't been converted (!!)

_trampeltier 2y ago
Switzerland trains still use 16,7 Hz (16 2/3Hz)
- Ericson2314 2y ago
  Yes indeed, but the German-Swiss-Austrian 16.7 Hz system is many orders of magnitude bigger than the Southend Electrification! The path dependency is much more understandable in that case.
  - cenamus 2y ago
    It's also 16.7 Hz precisely (save for the fluctuations) and not 16 2/3 Hz, for some electrical reasons regarding transorming 50 Hz to 16.7 Hz mechanically, which I don't completely understand
    - schobi 2y ago
      I understand that historically it was 16 2/3 Hz and power transfer from to the 50 Hz grid was done via 1:3 mechanical coupling with a motor and generator. That was a ratio easily achievable with gears. Nowadays with switched power supplies, this is not a problem any more. Keeping track of 16.7 Hz seems a little easier. Imagine building a numeric display for a power plant operator to see how far off you are.
      - Symbiote 2y ago
        > Imagine building a numeric display for a power plant operator to see how far off you are. You could build a display with 3 as the denominator, and a decimal numerator: | |_ 2.1 | | \ --- | \_/ 3
486sx33 2y ago
Ontario, Canada, at niagara falls generated 25hz for industry (stelco and others) until the early 2000s https://www.lifebynumbers.ca/history/the-rise-and-fall-of-25-cycle-hz-electricity-in-ontario/ https://www.lifebynumbers.ca/history/the-rise-and-fall-of-25...
- sathackr 2y ago
  Large parts of the NE corridor train line(DC to NY and New Haven to Boston) still operates at 25hz and has its own power system and generators because of it.

4 ms·

https://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_power_system https://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_powe... predates standardized 60 Hz

by Ericson2314 2y ago

https://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_power_system https://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_powe... predates standardized 60 Hz, and still hasn't been converted (!!)

_trampeltier 2y ago
Switzerland trains still use 16,7 Hz (16 2/3Hz)
- Ericson2314 2y ago
  Yes indeed, but the German-Swiss-Austrian 16.7 Hz system is many orders of magnitude bigger than the Southend Electrification! The path dependency is much more understandable in that case.
  - cenamus 2y ago
    It's also 16.7 Hz precisely (save for the fluctuations) and not 16 2/3 Hz, for some electrical reasons regarding transorming 50 Hz to 16.7 Hz mechanically, which I don't completely understand
    - schobi 2y ago
      I understand that historically it was 16 2/3 Hz and power transfer from to the 50 Hz grid was done via 1:3 mechanical coupling with a motor and generator. That was a ratio easily achievable with gears. Nowadays with switched power supplies, this is not a problem any more. Keeping track of 16.7 Hz seems a little easier. Imagine building a numeric display for a power plant operator to see how far off you are.
      - Symbiote 2y ago
        > Imagine building a numeric display for a power plant operator to see how far off you are. You could build a display with 3 as the denominator, and a decimal numerator: | |_ 2.1 | | \ --- | \_/ 3
486sx33 2y ago
Ontario, Canada, at niagara falls generated 25hz for industry (stelco and others) until the early 2000s https://www.lifebynumbers.ca/history/the-rise-and-fall-of-25-cycle-hz-electricity-in-ontario/ https://www.lifebynumbers.ca/history/the-rise-and-fall-of-25...
- sathackr 2y ago
  Large parts of the NE corridor train line(DC to NY and New Haven to Boston) still operates at 25hz and has its own power system and generators because of it.