3 ms·
"Monitor electricity 3600 times a second" in the video seem wrong, as AC is usually 50 to 60 HZ that would be measuring the consumption 60 to 72 times per perio
by carreau 8y ago
"Monitor electricity 3600 times a second" in the video seem wrong, as AC is usually 50 to 60 HZ that would be measuring the consumption 60 to 72 times per period which does not really make sens. It's likely 3600/hour or 1/seconds. Immediately make me doubt the quality of the research.
Edit: DC -> AC. was tired.
- rabidrat 8y ago*AC is 50 to 60Hz (DC does not alternate). Also I can see how it's possible that electrical fluctuations could happen at a higher rate than the utility frequency. 3600 Hz does seem like a lot though.
- carreau 8y agoOops. Fixed AC/DC. I know better. 3600Hz seem also quite a weird number while 3600 time an hour ends up being exactly once a second.
- 0ld 8y ago> DC is usually 50 to 60 HZ Immediately make me doubt the quality of the comment
- carreau 8y agoSorry meant AC, got things mixed up in my head with solar beeing DC.
- setquk 8y ago3600 times a second is reasonable if you want to calculate true RMS values at 50/60Hz. This is almost required as well as most inverter and supply waveforms are far from sinusoids.
- donquichotte 8y agoIf you have distorted currents and voltages, you need to do this. 3.6kHz sampling captures harmonics up to 1.8kHz, which is the 36th harmonic. Power is 1/T \int_0^T U(t)*I(t)dt for periodic signals with period T, and if current and voltage cannot be assumed to be sinusoidal, faster sampling is needed.
- pjc50 8y agoStandard advice for digital scopes is that you need a sample rate at least 10x the signal you're trying to look at. The main signal may be 60hz but for power quality you're interested in looking for harmonics, deformations to the waveform, current/voltage phase mismatch etc.