How electricity distributers achieve equal phase loads?

[user079622]

How electric distributers achieve equal phases load, is this done by itself?
Unequal situation hapend only in failure ?

That depend on load, not source, but they cant control load.. so how?

 

[russ_watters]

Engineers designing buildings must keep the phases as balanced as possible for practical (and maybe code) reasons. But randomness would tend to keep the overall grid pretty well balanced.

I'm not sure what, if anything, electricity producers do to actively try to balance the load. There may be some self-balancing mechanism though (higher current causes voltage to drop, lowering current?). An electrical engineer might know.

 

[Baluncore]

The problem really does not seem to be critical.

I would expect the momentum of rotating motors, and transformers with Y and Δ connections, would tend to rebalance the network.

 

[Averagesupernova]

Most electric distributors or sellers have a very good idea of what kinds of loads the territory that they serve will have. Very large users of electricity will be served by three phase and it is in their interest to see to their own loads are balanced. I won't say it takes care of itself, but to a certain extent it does.

 

[DaveE]

It will never balance perfectly, but it doesn't need to. As others said, things tend to average out. If they don't, in a significant way, the utility can shift things around to compensate. Users with big loads tend to want to draw balanced currents anyway, and many users with smaller loads will average out.

 

[Gavran]

The duty of current balancing is solidarity of both of electricity suppliers and customers. The utilities must do it for voltage balancing by equally distribution of single-phase customers between three phases, while they can do nothing for voltage balancing by equally distribution of single-phase loads of three-phase customers. Only three-phase customers can have responsibility for doing it for their single-phase loads.

The power quality penalty and unbalanced current-based tariff can be innovated for encouraging them to do it like as utilities.