From: noone@nospam.com   
      
   Στις 27/1/2020 4:45 π.μ., ο Grant Taylor έγραψε:   
   > On 1/26/20 6:22 PM, gfretwell@aol.com wrote:   
   >> In accepted nomenclature if the big number is first, it is 3 phase, if   
   >> the small number is first it is single phase.   
   >   
   > Okay.  That makes quite a bit of sense.   
   >   
   >> 240/208 is 3p wye   
   >   
   > Um, That doesn't make sense to me.   
   >   
   >> 240/120 is 3p delta (center tapped)   
   >   
   > I don't know how to unpack that.  (I don't know as much about ∆ as I do   
   > about Y.)   
   >   
   >> 120/240 is single phase.   
   >   
   > That makes a lot of sense to me and what I'm accustom to hearing.   
   >   
   >>   I also assume the "?" that is showing up is just the way a news   
   >> client is rendering the "root" symbol.   
   >   
   > Probably.   
   >   
   >> The ratio of L/N to L/L voltages on 3p wye are a function of the   
   >> square root of 3.   
   >   
   > That's different than I remember.  But I could be misremembering or had   
   > the wrong understanding at the time.  I'll refresh myself and reply later.   
   >   
   >   
   > In Europe, it's always 230/400 volts earthed wye. Used to be 220/380   
   volts earthed wye. Medium voltage was 15 kV, now is 20 kV all over   
   Crete, the island where I live, and high voltage is 150 kV. There's a   
   plan of connecting the island to the greek mainland with 2 150 kV   
   underwater cables and one 750 kV HVDC so completely shut down the   
   on-the-fly electricity generation on the island, with mazut and diesel   
   and some renewable. There's a very old power station near the city I   
   live, in Linoperamata, with some small steam units, 2-stroke diesels and   
   gas turbines, burning in excess 300,000 tons of heavy fuel annually.   
   When the interconnection will be realized the plant will shut down.   
      
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