From: dxmm@albury.nospam.net.au   
      
   On 20/05/14 06:53, Ian Field wrote:   
   >   
   >   
   > "Daniel"  wrote in message   
   > news:vi84v.62218$%x6.40968@fx16.iad...   
   >> On 17/04/14 23:46, Uncle Peter wrote:   
   >>> On Thu, 17 Apr 2014 13:50:32 +0100, Daniel    
   >>> wrote:   
   >>>   
   >>>> On 17/04/14 10:07, Uncle Peter wrote:   
   >>>>> Can someone confirm that power factor is NOT taken into consideration   
   >>>>> for domestic supplies?  I have a feeling it isn't, but I can't find   
   >>>>> any   
   >>>>> information on the internet.  If it matters, it's a modern (<5 years   
   >>>>> old) electronic meter I have.  The power factor in my house is an   
   >>>>> average of 0.7 so depending if it's charged for or not, my bill   
   >>>>> could be   
   >>>>> completely different.   
   >>>>>   
   >>>> When I last dealt with this, power generator companies "assumed" there   
   >>>> would be an average power factor and set up their generators to handle   
   >>>> that. Your individual house (or, probably, even a small factory) would   
   >>>> not cause much variation in that power factor, considering the   
   >>>> generators are probably supplying hundreds of thousands of homes at the   
   >>>> same time!!   
   >>>   
   >>> That won't apply to switched mode power supplies clipping off the peaks   
   >>> though.   
   >>>   
   >> Wouldn't cause a very big blip in the grander scheme of things.   
   >>   
   >> And what SMPS clips off the peaks?? Usually they vary the switch on   
   >> point in the A.C. waveform.   
   >   
   > Between each peak the reservoir cap sags a little, each peak tops it up   
   > againd and passes a large blip of current doing so.   
      
   Yeap, but the transformer Secondary's peak voltage  must exceed the   
   cap's voltage to then "top-up" the capacitor.   
      
   > AFAIK, current regs require a PFC front end on any switcher over 50W.   
      
   Don't know!! The impression I got was that domestic mains supplies PF   
   varied reasonable as it was, due to domestic fridges, fluoro's, T.V.'s,   
     etc, switching on and off at different times, that the major power   
   suppliers did not worry about the domestic situation .... but in   
   industrial situations, yes, the major power suppliers could/would   
   require PF correction.   
      
   > In the 80s there were hundreds of  thousands of TVs with half wave   
   > thyristor buck regulators - the generating companies weren't happy.   
      
   Daniel   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)