• bobs_monkey@lemm.ee
    link
    fedilink
    arrow-up
    5
    arrow-down
    2
    ·
    1 year ago

    If the power into your house is off from 60Hz (or 50 depending on your region), an electrician isn’t going to do diddly.

    • datelmd5sum@lemmy.world
      link
      fedilink
      arrow-up
      1
      ·
      1 year ago

      How could it be off frequecy at house level? Aren’t the generators at the powerplants being spun at 50 or 60 times a second?

      • bobs_monkey@lemm.ee
        link
        fedilink
        arrow-up
        1
        ·
        1 year ago

        Not exactly. There’s a ratio of RPMs of the drive motor to the specific input of the alternator that generates the correct frequency. It depends on the way the alternator is designed (ie number of poles) that will yield the correct frequency, almost like a gear ratio, that is optimized for efficiency, and power plants have to constantly make slight adjustments to the drive motor speed the keep the frequency exact (usually done automatically within the drive control system).

        I’ve never seen frequency be an issue in a residential system, but in theory it could happen.

        • datelmd5sum@lemmy.world
          link
          fedilink
          arrow-up
          1
          ·
          1 year ago

          I don’t know how it’s in 60Hz regions, but here the generators are in 3 phases, 120 degrees apart. The voltage gets transformed to up to 400kV, still in 3 phases, and then down to 400V when it’s distributed to peoples’ homes. Then you can pull 400V 3-phase or 230V 1-phase from your wall.

          • bobs_monkey@lemm.ee
            link
            fedilink
            arrow-up
            1
            ·
            1 year ago

            It’s the same here, though we have varying degrees of transmission and distribution voltages via transformers and regulators. In my area, power comes into our valley from the 500kv lines through the open desert, into the valley at 33kv, and stepped down to 5kv for neighborhood distribution that the single phase 240/120v transformers tap off for the EOL.

            More of what I was getting at was that generation is more or less the same across regions. Some external fuel source (whether it’s diesel, natural gas, nuclear, steam, etc) does its thing to drive a rotor that’s connected into an alternator which is essentially an electric motor but instead of the electric motor doing the driving, it’s being driven which generates power, and the RPMs of whatever given fueled drive mechanism are not necessarily 1:1 with the alternator speed.

        • frezik@midwest.social
          link
          fedilink
          arrow-up
          1
          ·
          edit-2
          1 year ago

          It used to be common for clocks to be driven directly off the electrical frequency. The US Navel Observatory would call up generator plants and tell them to slow down or speed up a little to make a correction to all the clocks. I’m not sure if that still happens, though.

          • bobs_monkey@lemm.ee
            link
            fedilink
            arrow-up
            1
            ·
            1 year ago

            I’ve heard that trope before, same reason clocks in US schools/govt institutions were always plugged into a wall, hence these. Nowadays, NTP has rendered that obsolete.