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In the industrial electromagnetic environment, it is essential to protect systems from internal and external electromagnetic interference. To achieve this, three key strategies should be implemented during the design phase: suppressing the source of interference, blocking or reducing the propagation path of electromagnetic signals, and enhancing the system’s immunity. These principles form the foundation of electromagnetic interference (EMI) suppression.
The anti-interference capability of a DCS (Distributed Control System) is a comprehensive engineering task that requires both the manufacturer and the user to work together. The manufacturer must design and produce equipment with strong EMI resistance, while the user should consider EMI factors during system design, installation, operation, and maintenance. A well-integrated approach ensures the system's electromagnetic compatibility and operational reliability.
When selecting equipment for a DCS system, priority should be given to products with high electromagnetic compatibility (EMC) performance. This includes features such as floating technology, good isolation, and robust shielding. It is also important to review the manufacturer’s specifications, such as common-mode and differential-mode rejection ratios, voltage withstand capabilities, and tolerance to electric and magnetic field strengths. For imported systems, special attention must be paid to the differences between China’s 220V high-impedance grid and the 110V low-impedance grid used in Europe and America. Due to the higher level of EMI in Chinese industrial environments—often four times greater than in Western countries—equipment designed for foreign markets may not perform reliably under local conditions. Therefore, it is crucial to select products that meet Chinese standards like GB/T 13926 when using imported components.
In addition to equipment selection, integrated anti-interference design plays a vital role. This involves shielding the DCS system and its external wiring to prevent radiated interference. External cables, especially power lines, should be isolated and filtered to avoid conducting EMI into the system. Proper grounding is also essential, with careful planning of grounding points and the use of reliable grounding devices. Furthermore, software solutions can enhance the system’s security and stability by detecting and mitigating potential interference issues in real time.
By combining hardware and software measures, and by carefully considering both the design and operational aspects, DCS systems can achieve optimal performance even in challenging electromagnetic environments.