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Reverse your smart energy meter with this simple trick!
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amyk:
Does anyone else get reminded of the old ads in the back of some electronics magazines that told you how to make a device that would cause the meter to run backwards? I always thought those were just scams for the gullible... this was decades ago.
station240:

--- Quote from: coppice on August 13, 2021, 05:55:00 pm ---The article is pretty vague. It would be interesting to see a proper description of the type of dimmer causing this, and the waveforms it produces.

--- End quote ---

Huh ?
Read the linked PDF, page 4 onwards, figure 6 in particular.
coppice:

--- Quote from: station240 on August 14, 2021, 03:16:42 pm ---
--- Quote from: coppice on August 13, 2021, 05:55:00 pm ---The article is pretty vague. It would be interesting to see a proper description of the type of dimmer causing this, and the waveforms it produces.

--- End quote ---

Huh ?
Read the linked PDF, page 4 onwards, figure 6 in particular.

--- End quote ---
Ah, I missed that there was a detailed document as well as the news article.

The measurements seem interesting, but the conclusion is bogus. They assume this must be an EMI issue, without investigation. If you look at the design of various measuring techniques used in meters, there could well be problems with the power measurement algorithm being fooled by the waveforms. I wonder if the 4 meters giving funky results all use the same measurement front end, and what that front end might be?
Jeroen3:
I think that maybe the big short current pulse is being flattened and delayed by the digital filtering.
Can't make perfect filters...
Zero999:

--- Quote from: langwadt on August 13, 2021, 03:35:38 pm ---
--- Quote from: Zero999 on August 13, 2021, 02:48:08 pm ---
--- Quote from: Red Squirrel on August 13, 2021, 11:49:25 am ---Wow that's pretty bad.  I could see that easily happen accidentally and lot of people getting screwed over by that once they are "caught".

--- End quote ---
As mentioned above, intent is everything. If it's caused by a fault in the meter and a load, which just happens to emit the right kind of noise for it to roll backwards, then you'll probably get away with it. On the other hand, if it can be proven you designed a device, specifically to emit noise, with the intention of causing the meter to roll backwards, then you can be done for fraud.

I also wouldn't be surprised if the power company could theoretically, get you to pay them, for any electricty they gave you for free, even if it was their error, but they would have a hard time proving it and it would have to be split up into reasonable, instalments, over a fair time period.

--- End quote ---

I'd expect that if the bill is high the power company will say the meter is has been tested so pay up, if it bill is low they
will assume you cheat and tell you to pay up an estimate based on previous bills

--- End quote ---
That's why we have courts.

If I were running a power company and I genuinely thought a customer had cheated, then I wouldn't be just looking at reclaiming the money, but they also received a suitable penalty from the authorities to deter them and others.
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