First, the daily maintenance of low-voltage power distribution cabinets includes several essential tasks to ensure safe and efficient operation. Begin by regularly checking for pests inside the cabinets and setting up traps as needed. Make sure all warning signs and service cards are properly placed and visible. Verify that emergency tools, such as flashlights, are available and in good working condition, along with the handles of any switches or fuses. Inspect cable connectors for signs of discoloration due to heat (typically a silver color) and check if grounding wires are rusted or have poor solder joints. Also, examine the casing of capacitors in the capacitor cabinet for damage, leaks, or swelling, and ensure the indicator lights are functioning correctly. Check the grounding connections of each capacitor case and keep the cabinets clean and free from dust. Additionally, verify that the cooling fans in each cabinet are operating properly.
For the first-level maintenance, inspect the busbars and their connections to ensure they are secure. Check the secondary circuit wiring for tightness, confirm that fuses are intact, and test the insulation resistance. When inspecting the capacitor cabinet, disconnect the air switch without the capacitor connected and test the controller’s functionality. Adjust the overvoltage and undercurrent protection settings as required. Ensure all indicator lights are working, and check and adjust the leakage switch, thermal relay, and multi-function meter. Confirm that all indicator lights are normal, the controller switch is in the correct position, and the manual interlocking mechanism is reliable. Finally, check the fasteners on soft starters and inverters to make sure they are not loose.
In the second-level maintenance, assess the flexibility and mechanical locking of drawer switches, and ensure the contactor contacts are in good condition. Check the spring tension of each knife edge in the circuit breaker and confirm the arc suppression device is intact. Tighten all terminal nuts on the cables and ensure that the primary and secondary lines of transformers are secure and free from mold or damage. After disconnecting the main switch of the incoming and communication cabinets, use a special rocker to move the drawers out. Check that the secondary wiring heads are well secured and that there is no looseness or corrosion.
Daily maintenance of the incoming switch requires the circuit breaker to be turned off, ensuring the energy storage spring is released. The circuit breaker should be disconnected from its fixed position using the rocker, while also cutting off the power and auxiliary circuits. Ground the terminals on both the power supply and load sides to ensure safety.
1. Clean the equipment using a dry cloth to remove dust and oil. If possible, use a non-corrosive cleaner.
2. Ensure the device nameplate is intact and clean it with a dry cloth.
3. Remove dust, mold, and oxidation from the interior of the draw-out circuit breaker.
4. Make sure there are no foreign objects in the circuit breaker compartment.
5. Wipe down the edges and busbars of the circuit breaker with a clean, dry cloth.
6. Check that all terminal connection bolts are tightened and look for signs of overheating, which may appear as discoloration.
7. Ensure the cables on sliding contacts or terminal blocks are securely fastened.
8. Contact ABB Technical Support if repairs are needed.
9. Always read the instructions carefully before proceeding with any maintenance work.
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Low-voltage power distribution cabinet daily maintenance - Solutions - Huaqiang Electronic Network
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