First, the daily maintenance of low-voltage power distribution cabinets includes several key steps to ensure safe and efficient operation. It is important to regularly inspect the cabinets for signs of pests and set up traps if necessary. Check that all warning signs and service cards are in place and clearly visible. Make sure emergency tools, such as flashlights, are present and functioning properly. Also, verify that the handles of fuses and switches are intact and easily accessible.
Next, check the cable connections for any signs of overheating or discoloration, which could indicate a potential fault. Ensure that the grounding wires are not rusted and that solder joints are secure. Inspect the capacitor cases within the cabinet for any damage, leaks, or bulging. Confirm that the indicator lights are working correctly and that the grounding connections are tight.
Keep the cabinets clean by removing dust and debris regularly. Check the fans in each cabinet to make sure they are operating smoothly. These routine checks help prevent issues before they escalate.
For the first level of maintenance, focus on the busbars and their connections. Ensure that the secondary wiring is secure, the fuses are intact, and insulation resistance is tested. In the capacitor cabinet, test the controller's response when the air switch is turned off without the capacitor connected. Adjust the overvoltage and undercurrent protection settings as needed.
Check that all indicator lights are functioning properly. Verify the performance of circuit breakers, leakage switches, thermal relays, and multi-function meters. Ensure that the controller switches are in the correct position and that mechanical interlocks operate reliably. Also, inspect soft starters and inverters for any loose fasteners.
During secondary maintenance, check the drawer switches for smooth operation and reliable mechanical locking. Ensure that the contacts of contactors are in good condition. Examine the spring tension in circuit breakers and confirm that the arc suppression devices are intact. Tighten all cable terminals and inspect the transformer connections after disconnecting the main switch. Make sure there is no mold or corrosion on the wiring.
When maintaining the incoming switch, always start by turning off the circuit breaker and releasing the energy storage spring. Disconnect the circuit breaker from its fixed position and isolate both the power and auxiliary circuits. Ground the terminal points on both the power and load sides.
Perform a thorough cleaning of the equipment using a dry cloth to remove dust and oil. If possible, use a non-corrosive cleaner. Clean the nameplates carefully to ensure they remain legible. Remove any dust, mold, or oxidation from the internal components, especially inside the draw-out circuit breaker. Check that there are no foreign objects inside the circuit breaker compartment.
Wipe down the edges and busbars with a clean cloth. Inspect the terminal bolts to ensure they are tight and look for any signs of overheating—such as discoloration at contact points, which may appear as a change from silver to brown. Confirm that the cables on sliding contacts or terminal blocks are securely fastened.
If any repairs are required, contact the ABB Technical Support Department. Always review the relevant guidelines and safety procedures before proceeding with any maintenance tasks. Regular and proper maintenance ensures the longevity and reliability of your electrical systems. Overhead Line Fitting,Short Insulator Pin For Insulator Supporting,Spindle For Insulator,Ceramic Pin Insulator Shahe Yipeng Import and Export trading Co., LTD , https://www.yppolelinehardware.com