One, Daily Maintenance of High-Voltage Distribution Cabinets

1. Regularly inspect each cabinet for signs of pest or rodent activity and conduct trapping on a regular basis.

Ensure the placement of all warning and maintenance signs is correct.

Ensure that emergency tools and lighting are complete and functioning properly, and that the toggle and fuse handle are all present.

4. Inspect the cable joints for any signs of overheating or discoloration (usually silver), and check for rust on the grounding wire (whether the welding points are normal).

Check the capacitor cabinet for any signs of leakage or swelling on the capacitor casings, and ensure the indicator lights are functioning properly.

6. Inspect the contact status of the grounding wires on each capacitor casing.

Ensure cleaning and dusting in all cabinets are well-maintained.

Inspect the operation of fans in each cabinet.

Level 1 Maintenance

Check the busbar and its lower leads for firmness.

Ensure the stability of the secondary circuit wiring, the integrity of the fuse, and the摇测 of the insulation resistance.

3. Capacitor Cabinet Inspection: Perform action tests on the capacitor controller with the air switch disconnected and no capacitors present. The sequence should be to first close and then open the switches that were initially closed, and vice versa for those that were initially opened. Adjust the overvoltage protection, undercurrent protection, and switching threshold values.

4. Ensure all indicator lights are in good condition and inspect, adjust the circuit breaker leakage switch, thermal relay, intermediate relay, and multi-functional meter, etc.

5. Inspect if the indicator lights on each cabinet are functioning properly, if the controller switch positions are correct, the operation should be normal, and manually adjust the mechanical interlock section to ensure reliable closing.

Ensure that the fasteners of all soft starters and variable-frequency drives are securely fastened without any looseness.

Level 3 & 2 Maintenance

Check if the drawer-style switch is smooth to push in or pull out, ensuring the mechanical locking is reliable and the contactor terminals are in good condition.

Ensure that the springs of each knife edge inside the circuit breaker are functioning normally, and that the arc extinction device is in good condition.

Check the cable head terminal nuts for tightness.

4. After disconnecting the main switches of the receiving cabinet and the interlocking cabinet, the handles should be turned out smoothly or they should turn out freely. Ensure that the secondary winding terminals and other secondary connections are well-fitted and securely fastened without any looseness, and there should be no mildew or discoloration on the primary and secondary lines.