1, three-phase load distribution is unbalanced, resulting in three-phase imbalance, which can be solved by adjusting three-phase load balance.
2. The third harmonic of the neutral line is too large, so a filter device is needed. APF or neutral line current filter device can eliminate the neutral line current. There are two ways to solve the problem of excessive neutral current. One is to connect NBF neutral current interrupter in series on the neutral line, and the other is to supply power to the load with SPHF.