XPost: alt.comp.hardware.pc-homebuilt, sci.electronics.repair, s   
   i.electronics.basics   
   XPost: alt.home.repair   
   From: noone@nospam.com   
      
   On 10/2/2017 7:52 πμ, Michael Moroney wrote:   
   > Diesel  writes:   
   >   
   >> moroney@world.std.spaamtrap.com (Michael Moroney)   
   >> news:o7fjft$sj3$1@pcls7.std.com Wed, 08 Feb 2017 17:11:25 GMT in   
   >> alt.home.repair, wrote:   
   >   
   >>> Up the street from me, they upgraded a MV distribution circuit   
   >>> from a lower voltage to a higher one (13,800V I believe).   
   >   
   >> Have they been adding on to the circuits in your area? New buildings,   
   >> etc? What was the previous voltage?   
   >   
   > No new construction/new loads in that area.  It may have been done to   
   > allow that circuit to provide an additional 13.8K feed to a medical center   
   > a ways upstream. I am uncertain of the old voltage but the nameplate for a   
   > regulator transformer on a nearby old circuit reads 2400V which seems kind   
   > of low. The utility seems to have been upgrading other older/lower voltage   
   > circuits in the area as well.   
   >   
   >>> I've also seen the results of that type of surge.  The top of a   
   >>> pole broke in a storm and the 4800V MV distribution wires made   
   >>> contact with the 120V/240V feed to houses.  Two of them burned to   
   >>> the ground.   
   >   
   >> Ouch! I've seen this happen before too. Doesn't typically end well for   
   >> the building and/or the electrical system/attached devices inside.   
   Here in Iraklion,Crete MV used to be 15kV, now it's 20 kV I think.   
   Usually we don't have accidents of the primary messing with the   
   secondary. MV distribution is all around the city with buried cables,   
   some of them are very old, with paper insulation. However, there was a   
   bad accident where a lineman was connecting a new supermaket to a 20kV   
   circuit, there were two buried cables, and they have a special device   
   that checks if the cable is live. So he checked and it wasn't. But back   
   at the substation they energized it and the arc flash instantly killed   
   him, and temporary blinding everyone at the vicinity.And in the   
   Thessaloniki substation, a potential transformer exploded (400 kV) and   
   the debris destroyed an auto transformer (400/150 kV) and there were   
   serious problems with power for the whole area. I have  a surge power   
   strip on my computer and when I turn my PC off I throw both the PSU   
   switch and the power strip one. On my stereo I have a voltage regulator   
   and when off I throw the VR's switch, the power strip's and the amp's.   
   That should be enough. If there's an 20kV surge the PC and the stereo   
   would be the least of my worries.   
      
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