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A lot of homes have a 3-phase electric connection. Each of the phases has some appliances connected to it. That implies power consumption in any moment on each phase is different, we have an unbalanced or non-symmetric load.

Strongly unbalanced load is not desired because:

  • (3-phase) circuit breakers can trip because of the one overloaded phase. Even if the total load if far below circuit breaker's designed maximum. If this happens with the main connection circuit breaker, the whole house is blacked out.
  • It causes higher losses and lowers the energy transmission efficiency.
  • The power supplier company can penalize the consumer for it.

Are there any affordable means of balancing the power consumption of 3-phase home connection? Preferred are commercial solutions, but DYI is accepted too.

Reconnecting the appliances is an option to improve the power consumption balance to some extent. But it's non-sense to vacuum-clean only because the washing machine is on. The 3-phase consumption will always be varying, so at least improving the balance would suffice.

Phase-shifting transformer helps this situation in transmission networks but it is a utility grade solution.

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The only practical measure I know of is to thoughtfully layout the circuits on the distribution panel so large coincident loads are on different legs and random loads such as lighting are well distributed amongst the legs. –  bcworkz Feb 4 '13 at 23:27
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What country is this where 3-phase being used in the home? Split phase tends to be the common household power with 3-phase being used for industrial and agriculture in my experience. –  Fiasco Labs Feb 5 '13 at 3:42
    
I'm located in Slovakia, EU. Most of the homes are 3-phase connected here. Maybe even most of Europe is so, but I'm not sure. –  Peter Ivan Feb 5 '13 at 7:54
    
In the U.S. homes typically have split-phase power. With three phase going to buildings that need more power. –  Brad Gilbert Feb 5 '13 at 15:22
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Instead of rerouting load, intelligently adding home-made power production is the future. Disconnection of something with a cpu in it (everything beside a hot iron)is a bad idea.

In Europe, where even the smallest villages have 3-phase connection to every home, solar panels with LiIon buffer battery are hot. A 100W panel is ~300€ all inclusive. The DIY part would be the intelligently giving the selfmade power to the most loaded phase and only when it's assymetriccaly.

A friend did that with a small river generator in order to save penalty from the power supply company.

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Do you have any references/documentation on how to make such the DYI part? –  Peter Ivan Feb 22 '13 at 7:44
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