I have my own personal pad mounted transformer, all underground wire back in the woods. My memory might be wrong about the voltage... can't check it now because I can't get the 5i25 to come on line.
JT On 12/25/2015 4:48 PM, Bertho Stultiens wrote: > On 12/25/2015 11:25 PM, John Thornton wrote: >> There is no transformer in there... > Ah, sorry about that... > The second variable should then be considered, mains tolerance. > > The usual tolerance of the mains line is between +20% and -30%. If that > seems large, it is. If you ask the company what you may expect, they > will be very reluctant to give you an answer. The point is that the > mains is geared to deliver a resonably constant frequency at the cost of > voltage accuracy. > > The tolerance depends on topology and differs from where you are located > from the nearest transformer, how many connections are shared on the > transformer(s) and how the line is loaded along the way when it gets > home to you. > > > I actually measured the mains line at work once over a period of 7 days > (15s interval) because we were having trouble with a mercury lamp that > was not constant in intensity. The delivery company did not wish to be > bound to any "hard" values and said that there is no guarantee for the > actual voltage. They try to keep it within +/-15%, but cannot guarantee > it due to line topology. > > The measurements I took showed very nicely how the grid "wakes up" in > the morning and "enters sleep" in the evening. The voltage starts high > early and starts to drop and jumps up whenever the delivery company adds > a generator to compensate. The opposite happens late in the evening. The > variability was arround the +/-15%. > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
