The normal power supply of the PLC system is powered by the grid.Due to the wide coverage of the grid,it will be subject to all space electromagnetic interference that induces voltages on the line.Especially the changes in the power grid,the operation surge of the knife switch,the start and stop of the large power equipment,the harmonics caused by the AC and DC transmission devices,the transient impact of the grid short circuit,etc.,are all transmitted to the primary side of the power supply through the transmission line.
PLC系统的正常供电电源均由电网供电。由于电网覆盖范围广，它将受到所有空间电磁干扰而在线路上感应电压。尤其是电网内部的变化，刀开关操作浪涌、大型电力设备起停、交直流传动装置引起的谐波、电网短路暂态冲击等，都通过输电线路传到电源原边
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