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Fooling the power meter "legally"

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LAN_403

HV Enthusiast

Tue Apr 15 2008, 05:49PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

wrote ...

Yes, you right, but I'm talking about 2KW of total power in the pulses. And the 20A breaker should stand over 4KW. So my device will not trip the breaker.I stand on this...

No again. Current breakers have an instantaneous trip limit. Typically this is 3x, 5x, or whatever of the rated continuous current for short duration pulses.

A 70A pulse, at 1% duty cycle on a 20A breaker rated at 3x instantaneous current will trip even though the continous average power is only approx. 80W. (assuming 120VAC)

wrote ...

I stand on this...

Custer said the same thing . . .

Mates

Tue Apr 15 2008, 07:02PM

Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566

Dear Daniel, I understand that you need your last wordâ€¦ Believe me, I respect you and you can have it but I have one more comment beforeâ€¦
Maybe your house is equipped by high-tech current sensing breaker with the ability to react on pulses shorter then 1us which amp peak is 10times higher than the rating of the breaker. However, my home 10A fuse and 30A breaker are not responding in this manner. I know that for sure; because I have an experimental prove for that. If you go back to the scheme I posted in the beginning of the thread, the very same circuit is used for powering my SSTC (the primary is instead of the electrolytic cap and there is one more 200nF cap in parallel with the transistor otherwise is the same circuit). To believe me that Iâ€™m pumping huge amps over the transistor (I would say minimum 200A but could be even more) into my SSTC you can check my latest video of my coil here

The amps are taken straight from the mains at 170 KHz while no breakers are tripped and no fuse is burned even after few minutes run (the fuse is 10A!!!). The power-meter shows the consumption of approx. 2KW when the coil is running.

BTW: Your joke (if it is a joke) about Custer is little bit too short to be understoodâ€¦

Cheers Mates

HV Enthusiast

Tue Apr 15 2008, 08:14PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

Mates wrote ...

To believe me that Iâ€™m pumping huge amps over the transistor (I would say minimum 200A but could be even more) into my SSTC you can check my latest video of my coil here

Mates,

Firstly, i've built quite a number of coils to recognize that you are running a simple half-rectified SSTC. Nothing more. I can tell by both the arc appearance and the fact you are running at 50Hz which is your line frequency.
Also, the nature of the arc tells me your current profile is quite smooth, not peak.
And, if you were running your interface and somehow first converting the input AC using the topology you originally proposed, you would not hear the 50Hz line frequency which is so dominant in your video.

I appreciate the time you took to post the video, but its not convincing to your point.
This will be my last response to this topic.

Steve Conner

Tue Apr 15 2008, 08:30PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Arcstarter wrote ...

How about "more energy efficient"?

Energy efficiency is un-American, you can be locked up for it

This thread reminds me of an assignment I had in a previous job. I had to make a Zener clamp that would protect a laser diode against direct connection to the 240V mains. To test it, I built a test fixture that connected my "victim" to the mains for one half-cycle using a large solid-state relay.

I logged the current waveform using a DSO, and the peak current was well over 100A, about 130A IIRC. However, no fuses or breakers blew. Our outlets are on ring mains with 32A breakers.

Mates

Tue Apr 15 2008, 09:09PM

Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566

Dr. Shock wrote ...

And, if you were running your interface and somehow first converting the input AC using the topology you originally proposed, you would not hear the 50Hz line frequency which is so dominant in your video.

The 300uF foil cap in the circuit works as a current limitter. So, than of course you must hear the 50Hz because the pulses I'm pulling from the mains looks like this:

this is only a scheme, in reality at 170 KHz they are many more pulses and are much thinner.
Shit, now I noticed - there is an error in the picture, there should be 300V and not 300A....the amps are constatnt

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