Dear Mr. protoslash (Electrical)(OP)1 Dec 22 15:03
"2. The power source phase AB (is a single vector) supplying T1 load I1 and T2 load I2 respectively"
"....this is not true, when you flip the H1H2 for the second transformer, the voltage vector BA is supplying this transformer, Vab amd Vba is 180 out of phase. Also Phase A = Phase B is incorrect, they are only equal in magnitude, but the phase angle has to be 180 degrees apar."
With due respect, you are totally WRONG!"
1. In a 3-phase system phase A,B,C ; phase AN, BN, CN are three vectors with 120 deg apart.
Attention: 1. Phase AB, BC, CA vectors (also 120 deg apart between them). It is = 1.732 of AN, BN, CN in magnitude.
2. In your case, taking say only AB phase:
2.1. Phase AB , It is a single vector (NOTHING to do with 180 or 120 deg apart).
2.2. Phase AB supplies T1 with current I1 and T2 with current I2. Therefore, [Current A = Current B] = [I1+I2].
3. It DOEN'T matter whether phase A is connected to T1 H1 and T2 H2.
3.1. The source phase AB supplies load [I1 + I2].
3.2. Yes, the secondary currents are NOT in phase. It doesn't matter as they are different loads (NOT connected to each other)
Che Kuan Yau (Singapore)