WATLOWANAFZE工业控制系统 PPC-TB50 开放过程控制板

WATLOWANAFZE工业控制系统 PPC-TB50 开放过程控制板 

主要通过电源和信号线引入，通常称为传导干扰。这种干扰在我国工业现场较严重。

来自电源的干扰

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路。尤其是电网内部的变化，入开关操作浪涌、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，但其机构及制造工艺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，隔离是不可能的。

It is mainly introduced through power and signal lines and is often referred to as conducted interference. This kind of interference is more serious in the industrial field of our country.

Interference from the power supply

The normal power supply of the PLC system is powered by the power grid. Due to the wide coverage of the grid, it will be subject to all space electromagnetic interference and induced voltage and circuit on the line. In particular, the changes in the power grid, the incoming switch operation surge, the start and stop of large power equipment, the harmonics caused by AC and DC transmission devices, the short-circuit transient impact of the power grid, etc., are transmitted to the original side of the power supply through the transmission line.

PLC power supply usually uses isolated power supply, but its mechanism and manufacturing process factors make its isolation is not ideal. In practice, isolation is impossible due to the presence of distributed parameters, especially distributed capacitors.