I. Management Regulations
The State Grid Corporation's "DC Power System Operation Specifications" outlines the operational management requirements, stating that the supervisory unit responsible for the DC power system must carry out an annual inspection and evaluation of the system under its jurisdiction. This ensures that all components are functioning properly and meet safety and performance standards.
II. Inspection Process and Content
(1) Check that the battery room has proper ventilation, adequate lighting, and functional fire-fighting equipment. Ensure the temperature is within acceptable limits and that there are no flammable or explosive materials present.
(2) Confirm that the screen cabinet doors are intact and that the grounding system is in good condition.
(3) Inspect the batteries for any signs of leakage, swelling, or deformation of the casing.
(4) Verify that all connection points are secure, with no looseness. Check that the terminals are clean, free from salt deposits, and coated with neutral petroleum jelly.
(5) Examine the battery plates for cracks, bending, deformation, sulfation, or short circuits. Ensure the color of the plates is normal, and confirm that there is no undercharging or overcharging. Also, check that the electrolyte temperature does not exceed 35°C.
(6) Measure the voltage of each individual battery to ensure it falls within the acceptable range.
(7) Check the charging device’s AC input voltage, DC output voltage, and current. Ensure that the meters are accurate, the protection signals (sound and light) are functioning normally, and the running sound is consistent and free of abnormal noises.
(8) Confirm that the voltage on the DC control bus and power bus is within the specified limits, and that the float charge current meets the required standards.
(9) Test the insulation condition of the entire DC system to ensure it is in good working order.
(10) Inspect the monitoring signals for each branch circuit, ensuring they are operating correctly, the indicators are showing normal status, the fuses are intact, and the automatic air switches are in the correct position.
(11) Review the fire prevention measures for cables, and check that the cable heads show no signs of overheating.
(12) Ensure that all cable and protective appliance identification plates are clearly marked and accurately labeled.
(13) Confirm that the isolation between the positive and negative terminals on the DC feeder (separation) terminal block is complete and effective.
(14) Check that the input and output lines of the DC circuit breaker are wired according to the manufacturer's specifications, and that there is no looseness or damage.
(15) Inspect the insulation monitoring device for any physical damage or deformation, ensuring it is fully functional.
This comprehensive inspection process helps maintain the reliability and safety of the DC power system, preventing potential failures and ensuring continuous operation.
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