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large cotton reels in substation??

Kelly Marie Angel
Hi guys a couple of weeks ago I was looking on Google maps to try to work out a future planned trip for when lockdown is done anyhow I went onto satellite view which is basically an areal view of wherever your looking at. Part of my search I saw an areal view of our local grid substation at chickerell on the foto  there was what looked like very large cotton reels in the sub I was curious what they could be I hink they are very large chokes for voltage balancing there are also some square objects right next to them which I assume are capacitors not sure what voltage they run at but looks like 230/400 Kv does this sound about right? Incidentally I sorted out my rout for my future trip
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    Yes in the foto the trees have got all their leaves up so chances are it was taken in spring or summer I never thought about it like that im afraid my sense of direction  where east and west are is always something I struggle with i only know 2hich way is north because the ridgeway is north and you can't miss that when your in town! Anyhow back on topic I've done a bit more research and the cotton reels are indeed chokes/reactors and there are capacitor banks in series with them still don't know what the squear spindly objects are maybe a harmonic filter? Or circuit breaker its not certain what they are but thats how it is. Thanks for your help guys
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    Hi guys hope you don't mind me reviving this thread but I've done a bit of research and I've found out the cotton reels are reactors the tall structures are capacitor banks and the smaller square devices are harmonic filters  so there now we know
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    Kelly Marie Angel:

    Hi guys hope you don't mind me reviving this thread but I've done a bit of research and I've found out the cotton reels are reactors the tall structures are capacitor banks and the smaller square devices are harmonic filters  so there now we know


    Thanks Kelly that's very interesting. I wonder how they make the big capacitor banks. Do they solder a lot of smaller capacitors in series parallel groups?


    Z.


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    (here) suggests films of plastic and aluminium foil, immersed in oil.

    Image a big swiss roll, or a club sandwich with hundreds of layers. Expulsion fuse externally or deliberate weak link inside.


    When the voltages get high enough, then they put banks in series on trays one above the other.

    M.
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    In the videos and fotos I've seen it looks like large numbers of capacitors in mixed series parallel arrangement  as zoom says above. I've worked on large DC cap banks in the past the amount of energy stored is scary  I imagine that if the AC cap banks are switched off at the peak of the wave the engineers have to be very careful to make sure they are discharged
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    There is much fun to be had in charging caps then giving rapid discharge, sounds lovely?

    Ranks along with making asbestos sheets explode when you light a campfire underneath `em.

    Oh we had such fun in the olde days!!!

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