From: null@void.com   
      
   On 4/26/2017 2:14 PM, Michael Moroney wrote:   
   > gfretwell@aol.com writes:   
   >   
   >> That is why I suggested they may just be boost transformers to prop up   
   >> sagging voltage. I have never seen anything like that so I am just   
   >> guessing.   
   >   
   > I have never seen anything similar elsewhere.  Why a boost transformer   
   > directly below a main transformer (and connected to it) rather than   
   > correcting the transformer's voltage itself?   
   >   
   > I have seen regulating transformers on MV lines, usually on lower   
   > voltage (older) lines running a long distance.   
   >   
   > Distantly related:   
   >   
   > Buffalo NY (one of the first cities to be electrified BTW) once had an   
   > OLD system of street lights with incandescent bulbs wired in series. I   
   > believe this system is all gone now but am not sure.  Somewhat of   
   > interest was the setup used to power a particular circuit of lights.   
   > There was a large cylinder can (almost certainly a transformer of some   
   > sort), a small cylinder and a rectangular box.  I believe the setup as   
   > a whole functioned as a constant current regulator.  I also think there   
   > were devices in each lamp in parallel with each bulb that would short-   
   > circuit if a bulb burned out (the burned out bulb would be subject to the   
   > full string voltage momentarily and the device would "fail" and short out)   
   > and the rest of the string would remain on. Think of it as a reverse fuse.   
   >   
      
   Transformer cans - I wondered about power factor correction caps. But   
   all of them I have seen are on the distribution voltage side.   
      
      
   Buffalo got power from the new AC generators at Niagra Falls - the   
   success of AC over DC in the "war of the currents".   
      
   Early electric lighting was arc lights. I think they were series.   
      
   Airports can have runway light circuits that are miles long. I think   
   (US) they are series loops at constant current. May be fed at 2kV or   
   higher. Taps to lights are with a current transformer. I assume they   
   must have a shunt for burned out lights.   
      
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