Current does flow from the load to the source... and vice-versa.
Please, I need an example to visualize that.
Apparently you need to expand on your viewpoint. It does not matter which side of the load or source we are on. The currents are the same at the load end of the circuit as they are at the source end.
Say you have a bus bar connected to a 1 kVA generator (1 Vac) on one side, in the other side you have 4 branch connected each one to a load. This loads consume 250 VA continuisly. They dont need to have a neutral since is an ideal scenario. Balanced system.
In this scenario, it does matter which side we are on. And the currents are not "the same at the load end of the circuit as they are at the source end" as you say.
Consider the equation at X0 of the wye transformer (as if this 4-wire circuit were the only one conducting) and tell me if it is any different?
X0?? Is that where the neutral is connected??. What transformer?? Im lost here...
To write your form of the equation, you have to adopt the convention that all currents flowing into a node are positive and all current flowing out of the node are negative. I refuse to adopt any convention that is totally unnecessary. Therefore, and quite simply, the sum of branch currents at a node equals zero.
I can adopt the convention I want, and you too. The things is that is better to adopt the convention that represent in a good way whats happening in the reality. Otherwise, you will confuse yourself and the other persons that are interested in what you are doing.
"the sum of branch currents at a node equals zero." Gustav Robert Kirchhoff (12 March 1824 ? 17 October 1887).
I believe with the type of load mentioned we can not have a perfectly balanced load. due to the nature of the load and many other loads on our systems the nature of a balance load might not exist. Non-sinusoidal and nonlinear loads are produced by ordinary household and office equipement. :grin:
Yes, but you can always simulated this unbalanced system with a group of balanced system independent of each other. So its good to have things clear in how a balanced system behaves. and how to analyze it.