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和电流，尤其是电网内部的变化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。PLC电源通常采用隔离电源，但因其机构及制造工艺等因素使其隔离性并不理想。实际上，由于分布参数特别是分布电容的存在，绝对隔离是不可能的。
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