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Registered Member #5171
Joined: Tue Jun 05 2012, 11:32AM
Location:
Posts: 67
Hello everyone. I need to power up a tesla coil that draws about 2-4kW, the only matter is that after 3kW the general interruptor goes off(standard italian contract ). So since i need more power, can i set 2 lines (of 2 different homes) in parallel? If yes, should i set them in parallel Before or after the bridge rectifier? Thanks.
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
So the 'Main' circuit breaker(the one that operates everything in the home) is tripping when you pull > 3kw?
A quick perusal of international wiring seems to suggest that a GFI main breaker is ued in many EU countries, and leakage to ground may be the cause of the tripping. In such case, paralleling power form different homes wont work nicely at all.
Do you have proper RF filtering on the power lines? And what sort of coil do you have? Given you mention a bridge rectifier, I'd suspect a SSTC/DRSSTC?
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
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Posts: 600
i think he is saying that the circuit is tripping due to ground strikes because your main breaker is GFI(ground fault interrupter) type. so its not so much your power, but the fact that the GFI is sensing current is going to ground and thinking that one of your appliances is shorting out.
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
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Posts: 1276
if you look, the normal Italian power contract is:
The basic electricity contract in Italy is set up to provide approximately 3 to 3.2 kilowatts. If a household expects to run a number of appliances simultaneously and exceed the power available a larger supply (up to 6 kilowatts) can be requested. There is a larger flat rate payment for the supply plus usage charged.
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
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Posts: 329
Ahh, well that would do it then, seeing
I was under the impression a 25A main with a 30mA RCD was normal. Either way, trying to parallel two RCD/GFI circuits that are on the different or even the same phase could be difficult. Even combining the two post recitifier, any difference in neutral potential (more than 2 diode Vf drops) and it will trip the RCD, even with no load. Once you have a load on it, all bets are off for sure. An isolation transformer for at least one supply seems like it would be the only way to prevent RCD issues
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
ConKbot of Doom wrote ...
Ahh, well that would do it then, seeing
I was under the impression a 25A main with a 30mA RCD was normal. Either way, trying to parallel two RCD/GFI circuits that are on the different or even the same phase could be difficult. Even combining the two post recitifier, any difference in neutral potential (more than 2 diode Vf drops) and it will trip the RCD, even with no load. Once you have a load on it, all bets are off for sure. An isolation transformer for at least one supply seems like it would be the only way to prevent RCD issues
so they don't have pole pigs in italy? if two house circuits are run on a different pole pig, there's all the isolation you need. in my multi kW induction heater, i may end up using a high voltage primary circuit by putting my houses duel pole in series with my neighbors(who is also working on it with me) to reduce the amount of current needed. i see no reason why paralleling of two dc lines is a problem if they both came from isolated sources.
Registered Member #5171
Joined: Tue Jun 05 2012, 11:32AM
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Posts: 67
Sorry for necro posting. My SSTC is almost ready right now... And i still don't know if i can parallel these two lines together. Let's make the point of the situation.
I live in a home that has 3 apartments in it. What i wanna do, is setting my apartment line and a other one in parallel, of course after the bridge rectifier. Both of the apartments have NO RCD, but just overload security switch. Since my TC, consumes 4kW peak and the italian standard contract is for 3-3.2-3.3kW max for each apartment, by paralleling them i would have up to 6.5kW of power.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I would use two ballast chokes or a centre-tapped transformer to ensure equal current sharing.
But beware, 3 phase power distribution systems are common, and the apartments might be on different phases. In that case you would measure 380V between them, and any attempt to parallel them would cause a massive short circuit.
Registered Member #5171
Joined: Tue Jun 05 2012, 11:32AM
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Posts: 67
That's no problem since i receive the single phase. Also i have the overloard security shutdown, in case of short that'd cause no damage anyway. For the short it should be ok, since i'll connect them after the bridge rectifier, right?
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Setting 2 lines in parallel
