Figure 16 3 phase Unbalanced Load

Three-Phase Circuits Summary

Electrical Science Volume 3 of 4
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Basic AC Power THREE-PHASE CIRCUITS 2. Current flow in lines B and C becomes the resultant of the loads in B and C connected in series. I_B V_L R_B R_C I_C I_B 240 40 40 I_B 3 amps I_C 3 amps I_N I_B I_C 3 3 I_N 6 amps 3. I_B V_L R_B I_C I_B 240 40 I_B 6 amps I_C 6 amps The current in Phase A is equal to the neutral line current, I_A = I_N. Therefore, I_N is the phasor sum of I_B and I_C. I_N 3 I_B (1.73)(6) I_N 10.4 amps In a fault condition, the neutral connection in a wye-connected load will carry more current than the phase under a balanced load. Unbalanced three-phase circuits are indicated by abnormally high currents in one or more of the phases. This may cause damage to equipment if the imbalance is allowed to continue. Rev. 0 Page 25 ES-09

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