Stability of 240v supply under FIT tarrif?

[tony sayer]

In article , harryagain scribeth thus

Go on harry, enlighten us .. and no plagiarising please...

[dennis]

Well everything is difficult for you.

[John Rumm]

We might have to adjust harry's hit rate.... previously I worked on the principle that 80% of what he posted would be wrong. Seems that might have been over generous.

[alan]

Apply a bit of snake oil to the terminals to reduce the distortion.

[harryagain]

And how exactly will you see how perfect or not perfect it is? Just eyeball it? Heh heh, You are as bad as TurNiP

The only way to be absolutely sure is to get a piece of graph paper and some sine tables and draw your own. And those tables were derived geometrically not by some stupid computer. Similar geometry to that going on in an alternator. And any non sinusiodal AC passed through inductors and capacitors, gradually gets to look more and more like a sine wave interestingly.

[tony sayer]

In article , harryagain scribeth thus

.

There are lot of distortions on the mains waveform.

Answer this question if you will. Have you got an Oscilloscope or not?..

[harryagain]

[tony sayer]

Well perhaps you should then you'll se what the mains really does look like;!..

[harryagain]

I saw it years ago. It was only a mildly interesting experience that I wouldn't be interested in repeating.

I don't recall any significant "distortion". Just an occasional spike.

Why do you suppose the mains would have a non sine wave? Every effort is made t omake it a sine wave. Sine waves comenaturally toany rotating electrical device Any deviation reduces the efficiency of any AC magnetic device

[Andy Burns]

Theory and practice always agree in your world, don't they?

[harryagain]

That sort of thing is caused by an iron core somewhere being driven into saturation (ie overloaded.) Probably a local transformer.

[harryagain]

To elaborate, if the voltage goes outside parameters, the core can become saturated so leading to the clipping effect.

The current has nothing to do with it. If voltage is constant, the flux in the core is constant from zero load to full load.

[The Natural Philosopher]

Proving once again that harry knows the square root of f*ck all about transformers.

[tony sayer]

In article , harryagain scribeth thus

Harry .. things have moved in since you looked after your boilers.

The mains these days has some rather "unpleasant" loading on it usually by semiconductor devices not transformers near saturation. Why is it that I can clearly see these even late at night when the loading on substation transformers goes right down?.

Answer me that one if you will..

[John Rumm]

The primary cause of mains distortion these days is discharge lighting and switched mode power supplies.

[harryagain]

The electrical load controlled by electronic devices is trivial compared with total load.

[Andy Burns]

How much power do you think datacentres gobble up? Vast warehouses full of rack upon rack of servers with SMPSUs ...

[charles]

True, but a few "not very good" fluorescent lights can make mains cables radiate on medium wave for quite a long way.

[Huge]

Tens of megawatts.

[The Natural Philosopher]

I think that's a little on the high side, megawatts, yes.