First a couple of comments:
- @afzumannu: don't post the same question twice, now you have two different posts regarding the same issue and different answers on each one (the other post: thread238-468015)
- This problem seemed pretty straightforward at first glance, you just need to solve the circuit, thats all. Easy, right?
Well, it's not that easy I can tell you. I'm strugling with it for a few days now (a few moments each day, to be honest). It's been a long time since I solve this kind of problems and it shows. It's a matter of honor at this point
Now back on track:
@7anoter4:
- Check the circuit you posted, it's laking the connection between star centers (the problem here is to find the neutral unbalance current between stars).
- When you solved the equations you forgot the capacitive reactances? 8.16 ohm its just the Xl for 60 Hz.
- OP never said it, but from the other post you can
guess that OP's frequency it's 50 Hz.
Can you confirm this, afzumannu?
I've solved the circuit, with one tiny little detail (two different ways, same results): I'm getting almost exactly twice the current beyond86 simulated with matlab (again, see the other post).
Line currents for 50 Hz (aprox 370 A):
Ir = 182.0875791+j318.1243825
Iy = 186.4995773-j320.6716509
Ib = -368.5871564+j2.547268414
Phase currents for star 1 (aprox 180-190 A):
Ir1 = 92.01248070+j160.7545872
Iy1 = 92.36007820-j158.8060369
Ib1 = -180.3976232+j1.246709657
Phase currents for star 2 (aprox 180-190 A):
Ir2 = 90.07509840+j157.3697953
Iy2 = 94.13949910-j161.8656140
Ib2 = -188.1895332+j1.300558757
And finally, unbalanced neutral current between stars:
In = 3.9749357+j3.195259957 (aprox 5.099 A)
But should be around 2.55 A?? (OP confirm this too, please!)