DSTA131 57120001-CV ABB

Suppress the interference introduced by the power supply In the DCS control system,the power supply occupies a very important position.The power supply interference is mainly coupled into the DCS control system through the power supply of the DCS system(such as the CPU power supply,I/O power supply,etc.)and the instrument power supply that has direct electrical connection with the DCS system.At present,for the power supply powered by the DCS system,the power supply with better isolation performance is generally used,while the power supply powered by the transmitter and the power supply of the instrument with direct electrical connection of the DCS system have not received enough attention.Certain isolation measures,but generally not enough.Therefore,on-site uninterruptible power supply(UPS)is often used for power supply to improve the safety and reliability of power supply.The UPS should also have strong interference isolation performance.It is an ideal power supply for DCS control systems.

抑制电源引入的干扰在DCS控制系统中，电源占有极重要的地位。电源干扰串人DCS控制系统主要通过DCS系统的供电电源（如CPU电源、I/O电源等）和与DCS系统具有直接电气连接的仪表供电电源等耦合进入的。目前，对于DCS系统供电的电源，一般都采用隔离性能较好的电源，而对于变送器供电的电源和DCS系统有直接电气连接的仪表的供电电源，并没受到足够的重视，虽然采取了一定的隔离措施，但普遍还不够。因此，现场多采用在线式不间断供电电源（UPS）供电，提高供电的安全可靠性，其UPS还应具有较强的干扰隔离性能，它是一种DCS控制系统的理想电源。