From: dh0496@windstream.net   
      
   On 6/5/20 11:05 AM, Michael Moroney wrote:   
   > Consider in the rural US, a very old section of a distribution circuit,   
   > operating at 4800Y/2770 volts delta. It is fed through a wye/delta   
   transformer   
   > bank fed from a 13.8 kV distribution circuit immediately followed by a pair   
   of   
   > voltage regulators connected open delta.   
   >   
   > About three miles downstream I have been monitoring the outlet voltage using   
   > a Raspberry Pi and a "Back-UPS ES 550G" UPS every 10 minutes. A few   
   questions:   
   >   
   > 1) When the regulator transformer steps one step, how much would I expect the   
   > outlet voltage to change from just that?   
   >   
   > 2) Over a period of a few weeks, I have seen the voltage range between 116   
   > volts and 125 volts. By current standards, what is the expected range one   
   > should see on a nominal 120V outlet? What is the largest acceptible   
   deviereation   
   > of the average voltage from 120 volts?  The building is new, 200A main   
   breaker   
   > but not using anywhere near that much, and the UPS is currently the only load   
   > on its circuit so the building itself contributes minimally to the   
   deviations.   
   >   
   > The power here has always been "bad", noticeable light blinking and there are   
   > relatively frequent power outages esp. during storms. The lone 116 volt   
   reading   
   > was sandwiched between a 122 volt and 123 volt readings. I just set this up   
   for   
   > curiosity, and to eventually check remotely during long periods away in the   
   > winter, to prevent pipe freezing if the heat is out for an extended time.   
   > (the Pi also measures the temperature. This project is not complete yet)   
   >   
         You might try the sci.electronics.design group if you're looking   
   for comments.   They discuss politics and printed circuit board designs   
   but at least there are some inhabitants.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)