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Mains frequency

Kelly Marie Angel
Just checked the dynamic demand site and the frequency was down to around49.7 cycles almost down to the lower legal limit never seen that before
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    Simon Barker:




    Denis McMahon:





    Posted by Simon Barker on Feb 14, 2020 8:13 am



    Or build big battery banks around the country.  Spare power from renewables can be stored.  Then when the generations drops too low, the batteries can top the grid up for long enough to bring backup generators on line.




    On a grid system powered by solar power we would certainly lose the stability provided by inertia. However, this is hypothetical, since I cannot envisage such systems. Solar panels are not very clever at night. Also bear in mind that nuclear power, though not strictly renewable, is virtually carbon free and is going to be with us for a good while yet. It is going to be some time before we worry about losing the stability of inertia.

     



     

    Not hypothetical at all.  South Australia already has a huge battery bank, and it appears to be doing a good job. https://reneweconomy.com.au/how-the-tesla-big-battery-kept-the-lights-on-in-south-australia-20393/ 


    It isn't intended to run the whole grid for hours on end.  It is there to store enough power to handle any short-term peak load, or sudden losses of supply.

     




     

    By "hypothetical", I meant relying almost totally on solar power. Thanks for the interesting web link, Simon. I have agreed all along that the building of big batteries all over the place makes good sense as we move towards more sources of renewable energy.
  • Former Community Member
    0 Former Community Member
    No need to stress over it Kelly, the CT scanner is a quick process but the MRI is indeed confined, so just think of the enormous benefit of the scan revealing your inside workings, so your diagnosis and subsequent care is correct!

    I fell asleep during one of the longer MRI scans as the headphones subdued the noise and yes, it is warm in there!

    Oh, they'll ask about being pregnant and any tattoos! Apparently the very very old or "privately done in your cell" inkings may have contained lead but as non ferrous, I couldn't see the logic as their viewing partition is lead loaded anyway.


    PM me if you need more reassurance.


    Regards


    BOD
  • 0
    Actually, unless you have steel shrapnel inside you, the bigger worry in an MRI scan should not be the magnet whcih is near constant with a small sweep coil adding and subtracting some milliTeslas from it, but the significant fraction of a kW of RF they use to get the nuclear magnets all jiggling together. There is a reason they like the room to be cool.



    Any way, there is no real need to worry - and it sounds like you (both actually) are in good hands.
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    Kelly Marie:

    Thankfully.my appointment went ok I had loads of tests and saw a consultant who wants me to have an MRI and CT scan and a blood test they are going to give me some stuff to help me stop panicking in the confines of the machine not out of the woods yet but getting there




    Splendid!


    I found an MRI scan of my back (twice) pretty unpleasant. What I couldn't understand was why they didn't put my legs instead of my body in the machine.


    In any event, I just closed my eyes, so it didn't matter whether the magnet was an inch, a foot, or a yard away.

  • 0
    Thankfully.my appointment went ok I had loads of tests and saw a consultant who wants me to have an MRI and CT scan and a blood test they are going to give me some stuff to help me stop panicking in the confines of the machine not out of the woods yet but getting there
  • 0
    They seek him here, they seek him there, those frenchies seek him everywhere, is he in heaven or is he in hell? that damned elusive Mapj1 Pimpernel!


    Fo a lot of years my other half (S W M B O) understood we were roughly similar distantish from Cornwall/Devon to London but could not quite get it why Devon/Cornwall were not "next Doorish" to London.


    Bit like I was having a friendly haggle with a pal over something. I offered £100 he wanted £200, he offered split the difference and I said OK I agree then £30 it is! What! he said. Well I ponted out that the difference was £100 and a split was not nessacarily £50/£50 it could equally well be £30/£70 therefore £30 was my opition. Naturally we acually settled on £150 and we were both happy. But it was fun
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    No. think private sector, not MOD, and I did meant near equidistant, not "midway", but to limit the circles of confusion,  I do meet a few brave folk at work who cycle in from each of those cities. And others, like me who drive in from not so far away as either. I'm not keen to reveal much more detail on an open forum. Those who need to find me, can.


  • 0

    mapj1:
    @ DZ I am to be found more or less equidistant  from Southampton and Winchester most of the year...



    That's too easy - does it begin with a P or a W? ?
  • Former Community Member
    0 Former Community Member

    Kelly Marie:

    Hey thanks il look forward to a sticky bun or 3  




     

    Stick to two - save one for the next day - always ?


    OMS
  • 0
    Hey thanks il look forward to a sticky bun or 3

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