Anti-jamming design for DCS control system engineering applications - Database & Sql Blog Articles

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In order to ensure that the system is protected from or reduced internal and external electromagnetic interference in the industrial electromagnetic environment, three aspects of suppression measures must be taken from the design stage: suppressing the interference source; cutting off or attenuating the propagation path of the electromagnetic interference; improving the anti-interference ability of the device and the system. . These three points are the basic principles for suppressing electromagnetic interference.
The anti-interference of dcs control system is a system engineering, which requires the manufacturing unit to design and produce products with strong anti-interference ability, and it depends on the use department to comprehensively consider in engineering design, installation and operation and operation and maintenance, and combine with the situation. Comprehensive design can ensure the electromagnetic compatibility and operational reliability of the system. When carrying out the anti-interference design of a specific project, the following two aspects should be mainly used.
1 Equipment selection When selecting equipment, first select products with high anti-interference ability, including electromagnetic compatibility (EMC), especially anti-interference ability, such as floating technology, good isolation performance DCS system Secondly, we should also understand the anti-interference indicators given by the manufacturer, such as the common analog ratio, the differential analog ratio, the withstand voltage capability, the work of allowing the electric field strength and the high-frequency magnetic field strength; Application performance in similar work. In selecting foreign imported products, we must pay attention to: China adopts 220V high internal resistance grid system, while Europe and America is 110V low internal resistance grid. Due to the large internal resistance of China's power grid, the zero potential drift is large, and the ground potential changes greatly. The electromagnetic interference at the industrial enterprise site is at least 4 times higher than that in Europe and America. The anti-interference performance of the system is higher. The DCS products that can work normally in foreign countries. In domestic industries, it is not necessarily reliable. This is a reasonable choice when using foreign products according to China's standards (GB/T13926).
2 The integrated anti-interference design mainly considers several if the suppression measures come from outside the system. The main contents include: shielding the DCS system and external leads to prevent electromagnetic interference from space radiation; isolating and filtering the external leads, especially the principle power cable, layered to prevent conductive electromagnetic interference from being introduced through the outer leads; correctly designing the grounding point And grounding device to perfect the grounding system. In addition, software must be used to further improve the security and reliability of the system.