BF> At least here in Sweden, where the power grid frequency is governed BF> by an atomic clock and is never more than 1 second out of sync per year, BF> the synchronous clock on my oven works fairly well.
BF> I can't really understand why some countries have to put up with 48Hz BF> and similar, we have a rock steady 50.00000 Hz here.
I can hardly beleave that, especially that 5 zero digits behind the period. Both production and consumption varies much, so the frequency of the waterturbines will very even.
The scond reason why I donot beleive your 50.0000 Hz is because the grids of all European countries are connectected together. Sweden too I suppose. I am sure about Norway. So the whole production industry has to arrange a stable net frequency.
You are sure your oven clock is not DCF77 connected? If it is DCF77 connected, the actual grid net frequency does not matter.
I now have a Fluke 179 True RMS Digital Multi Meter wich can also read ac~ frequencies, so I tried that at the local Dutch grid and I see 50.03 Hz. with 238.7 Vac~ at this sunday 17 th of june 2018 at 13:10 UTC, positon: 51.978845 E 5.904671 N i.e. in the city of Arnhem.NL at the river Rhine.
At the 17.5 kVA 4 stroke 4 cylinder diesel generator on my brother's inland ship I measure 219 Vac~ and 52.50 Hz. It has a fuse of 3 x 25 Amperes. I am going to investigate if I could level up the 3 Phase 220/380 ac~ Voltage to 3 x 230/400 Vac~ and lower down the frequency to 50 Hz? I am not sure if this is possible with this generator from the year 1996. The exact frequency is very important when you want to synchronise the dc=/ac~ sunpanel invertor. I am quite sure it will not connect with 52 Hz. Most sunpanel inverters have an anti islanding solution for security reasons. The other solution could be to use a sunpanel 24 Vdc= battery charger, in stead of a dc=/ac~ inverter.
I know a skipper here wo uses the land power line to synchronise his sunpanel dc=/ac~ invertor on. Last time he told me he had used 10 kW/h in Wageningen, and produced 30 kW/h back into the grid. Het got nothing for the feeding back and still had to pay the 10 kW/h he used in the dark, arg ;-(. When I asked him why he did not decouple the landline, he said he needed it for sunchronising the sunpanel invertor. I told him to buy an 24 Vdc=/230 Vac~ combi loader/inverter, and synchonise his sunpanel inverter with that. Then his batteries are loaded, and can be used when the sun is not shining enough, and do not take land power anymore. In future off grid is the way to go I think.
Henri.
--- * Origin: Connectivity is the Future; UniCorn BBS 31 26 4425506 (2:280/1208)
