From: noone@nospam.com   
      
   Στις 19/3/2020 1:58 μ.μ., ο DecadentLinuxUserNumeroUno@decadence.org   
   έγραψε:   
   > Dimitris Tzortzakakis  wrote in   
   > news:r4nr8h$o3e$4@dont-email.me:   
   >   
   >> Στις 12/3/2020 1:48 μ.μ., ο   
   >> DecadentLinuxUserNumeroUno@decadence.org έγραψε:   
   >>> "J.B. Wood"  wrote in   
   >>> news:r4apb8$1st5$1@gioia.aioe.org:   
   >>>   
   >>>> On 3/11/20 9:02 AM, Dimitris Tzortzakakis wrote:   
   >>>>   
   >>>>> as I am sure you know, measuring the PF on MV lines would need   
   >>>>> to interrupt the circuit and mount potential and current   
   >>>>> transformers to feed the measuring equipment.   
   >>>>   
   >>>> Hello, and that would certainly be the way via direct   
   >>>> measurement, but hardly practical if you're dealing with   
   >>>> something like a 34.5/19.9 kV 4-wire distribution system, as is   
   >>>> common in my residential environs. I'm unsure if MV PF   
   >>>> measurement equipment even exists.  Sincerely,   
   >>>>   
   >>>>   
   >>>   
   >>>     Somehow, they can tell at the generation point.   
   >>>   
   >>>     Not practical to examine in the field as you say.   
   >>>   
   >>>     I have seen sub stations with three sets of three phase feeds   
   >>>     and   
   >>> three sets of three huge banks of caps and 9 circuit interruptor   
   >>> swing arms too.   
   >>>   
   >> of course you mean disconnect switches (usually combined with   
   >> earthing switches and oil circuit breakers)   
   >>   
   >   
   >    Little 8 inch long arms I would call disconnects.  These are a few   
   > feet long each, IIRC.  All inside the substation's containment plot.   
   > It is over by the grocery so if I go before I die, I'll takes a few   
   > snaps.  It is a lot of converged feeds.  Three sets of three from   
   > what I can recall seeing.   
   >   
    >   
   https://www.flickr.com/photos/167258532@N02/46314850494/in/dateposted-public/   
   150 kV circuit breaker, upstream a disconnect switch. 4 150 kV lines,   
   one directly from the new Atherinolakkos power station. when I took this   
   photo we were all under the circuit breaker, which was live, goes   
   without saying. we were told that if this circuit breaker trips, the   
   result will be probably a blackout, long before a reclose. it supplies   
   half of Iraklion with electricity.   
      
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