Trev, The graph provided by the National Grid shows the total demand of the UK. It is continually updated and shows the demand for the previous hour. I cannot find a graph that shows the Grid voltage. As before, I was looking for a daily cycle in the Hum level that would match the Grid or anything else but thus far I have found nothing of any consequence and it looks like the main factor of Hum variations is the weather.
On Wednesday, November 27, 2013 10:40:30 AM UTC, Trev wrote: > > Ah, I took the load plot to be grid frequency which of course droops with > higher loads! > I would be wary of using voltage as a guide. The frequency plot shows mucg > better transient states. > I monitored this isn the 80's but it wastoo strategically important to let > everyone access! > > > On Sunday, 24 November 2013 15:59:16 UTC, John Dawes wrote: > >> Trev, >> The Hum readings and graph that I posted was for one day only and will >> need to be repeated a great many times before any conclusion can be made. >> As for the chart available from the National Grid it must be remembered >> that the voltage on the grid will be inversely proportional to the demand. >> >> >> >> On Saturday, November 23, 2013 1:59:18 PM UTC, Trev wrote: >>> >>> Dunno, John. Your hum was on the way back up at 11 when demand was >>> still falling on the graph you posted, anyway... >>> >>> On Friday, 15 November 2013 12:42:55 UTC, John Dawes wrote: >>>> >>>> On November 14 I made a series of readings of the relative Hum level >>>> taken at my home in Bristol UK. Starting at 7 am with one hour intervals >>>> until midnight, details are on the chart attached. >>>> There was a anomaly at 8 am followed by fall in level to a minimum at >>>> 10 am. >>>> There followed a rise until noon , a small dip at 3 pm and a rise >>>> during the evening. >>>> The most interesting was the rise which took place between 10 pm and >>>> midnight. >>>> At 11.15 pm I made a copy of the chart showing the UK Electrical Demand >>>> for the previous hour and one can clearly see the dramatic fall in demand >>>> at that time. >>>> >>>> -- You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/hum-sufferers. For more options, visit https://groups.google.com/groups/opt_out.
