The acceptance process for 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 are outlined below:
1. The equipment screen and cabinet must be securely fastened and properly grounded. The door of the cabinet should be connected to the main body using a bare flexible copper wire with a cross-sectional area of at least 6 mm². This ensures a reliable electrical connection and prevents potential hazards. Additionally, the surface coating should remain intact, and the overall appearance of the equipment should be clean and well-maintained.
2. All electrical components installed within the screen and cabinet must be complete, in good working condition, and properly positioned and secured. Circuit breakers or fuses should be selected according to the system requirements, and their operation must be selectively coordinated to ensure proper protection and avoid unnecessary tripping.
3. The secondary wiring should be correctly installed, with secure connections and clear, complete markings. The insulation resistance must meet the required standards to prevent electrical faults and ensure long-term performance.
4. In tropical and humid environments, screens and cabinets must be designed to resist moisture, mold, and heat. They should be inspected and tested according to the general technical specifications for tropical electrical products to ensure durability and safe operation under such conditions.
5. After installation, all cable entry points and gaps should be sealed to prevent water ingress, especially in areas where freezing conditions may occur. Proper sealing helps protect internal components from damage and extends the lifespan of the equipment.
6. The operational and interlocking tests should be conducted to verify that the AC power supply can switch reliably and that all functions meet the design specifications.
Regarding the specific requirement that the cabinet door and screen must be connected via a bare flexible conductor with a minimum cross-section of 6 mm², this is a newly added regulation. The rationale behind this rule is threefold: First, the metal casing of secondary electrical devices requires grounding, and a reliable grounding path is essential for safety. Second, if the cabinet door is not grounded and an appliance is mounted on it, a failure in insulation could lead to dangerous voltages on both the door and the cabinet, posing a serious risk to personnel. Third, from the perspective of electromagnetic interference (EMI) and signal integrity, grounding the door helps reduce noise and improves the performance of sensitive electronic systems like microcomputers.
The use of a bare flexible conductor with a cross-section of at least 6 mm² is primarily based on its excellent electrical conductivity, mechanical strength, and ease of installation. It also emphasizes the importance of visible and accessible connections, reducing the risk of accidental disconnection during maintenance or inspections.
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