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USA converting back to Direct Current

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    #46
    Originally posted by No Show
    This link talks about a city in NY(I believe to be Buffalo) that has been supplied with direct current for 125 years,
    It was Parts of Manhattan on the very old Con Edison system, and it is all gone as of Nov 17. The convesion, or elimination started in 1928, it was predicted it would take 45 years to eliminate DC, it took longer, but there is no going back.

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      #47
      I hooked up a semulator one time at the German Air Force Base in Texas and I had to use a rectifier cause it was 240v DC and I was under the empression that most of europe was operating on DC. If so how and why?

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        #48
        No Europe uses 240 VAC @ 50 Hz. No country uses DC to my knowledge. Only place DC was ever used was around NYC when Edison built the first commercial power grid, and it was completly disconnected last month.

        Not sure why an aircraft would use 240 VDC as most aircraft use either 28 VDC or 400 HZ AC. My guess is some odd German design. Not a military guy so I don't really know.

        Here is a link with all the voltages used globally:
        http://www.kropla.com/electric2.htm
        Last edited by dereckbc; 12-21-07, 10:04 AM.

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          #49
          Originally posted by dereckbc
          No Europe uses 240 VAC @ 50 Hz. No country uses DC to my knowledge. Only place DC was ever used was around NYC when Edison built the first commercial power grid, and it was completly disconnected last month.

          Not sure why an aircraft would use 240 VDC as most aircraft use either 28 VDC or 400 HZ AC. My guess is some odd German design. Not a military guy so I don't really know.

          Here is a link with all the voltages used globally:
          http://www.kropla.com/electric2.htm
          270 VDC is available in some military and prototype commercial aircraft systems.

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            #50
            Here's a white paper about using higher voltage DC for data processing Baldwin Technologies
            John
            Data Center Technical Operations Manager
            Connecticut Unlimited Electrical Contractor E-1
            Associate Member I.A.E.I
            The World Needs More Electricians & Fewer Electrical Installers

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              #51
              Originally posted by dereckbc
              No Europe uses 240 VAC @ 50 Hz. No country uses DC to my knowledge. Only place DC was ever used was around NYC when Edison built the first commercial power grid, and it was completly disconnected last month.

              Not sure why an aircraft would use 240 VDC as most aircraft use either 28 VDC or 400 HZ AC. My guess is some odd German design. Not a military guy so I don't really know.

              Here is a link with all the voltages used globally:
              http://www.kropla.com/electric2.htm
              Thanks very useful link. For all who visit this link, be sure to check out the plug types. It is intersting how many different configurations there are. One in particular (type E), has a male receptacle pin for the its EG connection, never seen that before. e/m
              A kwh saved is 2 kwhs earned

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                #52
                Originally posted by Rampage_Rick
                ...
                Of course now someone is going to tell me that LED signal heads employ bridge rectifiers to avoid this issue.
                LED signal heads employ bridge rectifiers to avoid this issue e/m
                A kwh saved is 2 kwhs earned

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                  #53
                  Originally posted by dereckbc
                  No Europe uses 240 VAC @ 50 Hz. No country uses DC to my knowledge. Only place DC was ever used was around NYC when Edison built the first commercial power grid, and it was completly disconnected last month.

                  Not sure why an aircraft would use 240 VDC as most aircraft use either 28 VDC or 400 HZ AC. My guess is some odd German design. Not a military guy so I don't really know.
                  It must have been some type of an inverter that only changed the hertz from 60 to 50 then. :smile: Thanks
                  Last edited by George Stolz; 12-26-07, 10:11 PM. Reason: fix quote

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                    #54
                    "Not converting the USA back to Direct Current" OK is that better "Boater Bill" :smile:

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                      #55
                      Works for me.

                      BTW, here is a link to a solar power contractor in my area that has a ton of info and links for homes off of the grid. All of the appliances are AC.

                      http://www.keypowerservices.com/

                      This discussion reminded of the SAE to metric discussions of the 80's, it sounded great on paper but no one was going to pay to replace all of their machine tools without a return for their investment.
                      Living in the sunshine, staying contented most of the time.

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