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What are the process acceptances of high-frequency switching power supplies and phase-controlled rectifiers?

The acceptance process of high-frequency switching power supplies and phase-controlled rectifier devices involves several key steps to ensure safety, reliability, and compliance with technical standards. These steps include: 1. The equipment screen and cabinet must be properly fixed and grounded. The door and the cabinet should be connected using a bare flexible wire with a cross-sectional area of at least 6 mm². This ensures a reliable electrical connection and prevents potential hazards. The surface coating should remain intact, and the equipment should be clean and well-maintained. 2. All electrical components installed inside the screen and cabinet must be complete, in good condition, and correctly positioned. Circuit breakers or fuses should be selected according to specifications, and their operation should be selectively coordinated to meet system requirements. 3. The secondary wiring should be properly connected, secure, and clearly marked. The insulation should meet the required standards to prevent electrical faults and ensure safe operation. 4. In tropical environments where humidity and heat are significant factors, the screens and cabinets must be moisture-proof, mildew-resistant, and heat-resistant. They should also comply with the general technical requirements for tropical electrical products. 5. After installation, all cable entry points and holes should be sealed to prevent water ingress, especially in areas where freezing conditions might occur through piping systems. 6. The operational tests and interlocking functions should be correct, and the AC power supply should switch reliably, meeting the design specifications. A new addition to these requirements is the use of a bare flexible conductor with a minimum cross-section of 6 mm² to connect the cabinet door and the main cabinet. This requirement was introduced because the metal casing of secondary electrical equipment needs proper grounding, and a reliable path must be provided. If the cabinet door is not grounded and an appliance is mounted on it, a failure in insulation could lead to dangerous voltages on the door, posing a risk to personnel. Additionally, grounding the door helps reduce electromagnetic interference, which is critical for sensitive electronic devices such as microcomputers. The use of a bare wire with a sufficient cross-sectional area ensures good electrical conductivity, mechanical strength, and ease of installation. It also avoids the risk of the connection being overlooked or disconnected easily, which could compromise the grounding system over time. This detail highlights the importance of both safety and long-term reliability in electrical installations.

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