Moreover, three-phase four-wire active filters can suppress zero line current, and solve symmetric problem of system effectively.
另外，三相四线制有源电力滤波器能有效地抑制零线电流，并能有效地解决系统的不对称问题。
So, it is significant to prevent the occurrence of faulted neutral line within the circuit of three phase and four line system.
因此，防止三相四线制配电回路断零事故的发生，具有更广泛的意义。
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