PM861AK02 ABB

Radiated interference from space Radiated electromagnetic fields(EMI)from space are mainly generated by power networks,transient processes of electrical equipment,lightning,radio broadcasting,radar,high-frequency induction heating equipment,etc.complex.If the DCS system is placed in the radio frequency field,it will receive radiation interference,and its influence mainly passes through two paths:one is the direct radiation inside the DCS,which is induced by the circuit;the other is the radiation to the network within the DCS communication,Interference is introduced by the induction of the communication line.Radiated interference is related to the layout of field equipment and the magnitude of the electromagnetic field generated by the equipment,especially the frequency.

来自空间的辐射干扰空间的辐射电磁场（EMI）主要是由电力网络、电气设备的暂态过程、雷电、无线电广播、雷达、高频感应加热设备等产生的，通常称为辐射干扰，其分布极为复杂。若DCS系统置于所射频场内，就会接收到辐射干扰，其影响主要通过两条路径：一是直接对DCS内部的辐射，由电路感应产生干扰；二是对DCS通信内网络的辐射，由通信线路的感应引入干扰。辐射干扰与现场设备布置及设备所产生的电磁场大小，特别是频率有关。