XPost: alt.sci.physics   
   From: imvalid@somewear.com   
      
   On Fri, 08 Dec 2017 05:17:41 -0000, Daniel60    
   wrote:   
      
   > James Wilkinson Sword wrote:   
   >> On Thu, 07 Dec 2017 12:29:19 -0000, Daniel60   
   >>  wrote:   
   >>> rickman wrote:   
   >   
   >    
   >   
   >>>> The point is that neither of these two cases are realistic because the   
   >>>> frequency is never perfectly stable.  That's the point, the whole grid   
   >>>> is a living, breathing entity and every part responds to the rest in a   
   >>>> way that tends to lock it together.  Talking about two generators being   
   >>>> some small amount different in frequency for any length of time won't   
   >>>> last, they will be pushed together.   
   >>>>   
   >>> Thanks for the memories!!   
   >>>   
   >>> As I was sitting here, catching up on these posts, I recalled, back   
   >>> about 40 years ago (in another life ;-) ), I worked at an Australian   
   >>> Army H.F. Transmitter site where, each Tuesday, we would test out our   
   >>> on-site, (3) 300KVA Blackstone generators by bring up one of them,   
   >>> syncing it to the mains supply, disconnecting the mains and then, a   
   >>> couple of hours later, bring up another gennie, sync it to the first   
   >>> one, then drop the first one off-line, and then a couple of hours later,   
   >>> sync this gennie back to the mains.   
   >>>   
   >>> All good fun!!   
   >>   
   >> Did you ever cause any explosions or fires?   
   >>   
   > No!! I suppose I could say I was an expert at sync'ing generators .....   
   > or at least that I was well trained ..... or that I was bloody lucky!! ;-)   
   >   
   > A story was told about someone having sync'ed a generator in 180 degrees   
   > out of phase ... and how the one ton flywheel attached to the generator   
   > crankshaft was found three mile down the road!!   
   >   
   > Weirdest power experience I've ever experienced was when "we" lost the   
   > neutral connection. This allowed the "Delta" connected three phase to   
   > float about all over the place, causing the three 240 V R.M.S. phases to   
   > vary as well.   
   >   
   > Transmitters, fluoro lights, etc, were switching on and off as if by magic!!   
   >   
   > Daniel   
      
   Not as bad as if a clumsy Irish electrician confuses new and old wire   
   colouring when refurbishing a building.  Black can be neutral or a phase....   
   Much smoke, big insurance claim for 40 computers, which I then fixed for 50p   
   each (blown bulk capacitors) :-)   
   A digital projector survived, as it was connected through a £5 surge   
   protector, which sacrificed itself by melting all over the desk.   
      
   --   
   Peter is listening to Eric Clapton - Layla   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)