How to Maintain Low-Voltage Distribution Cabinets?

The low-voltage distribution cabinet is widely used in sub-stations, power plants, industrial and mining enterprises, etc. It boasts strong breaking capacity, stable dynamic and thermal properties, and flexible electrical solutions. It comes in various categories, including GCS cabinets, GCK cabinets, MNS cabinets, etc. Regular maintenance is also required for low-voltage distribution cabinets. How to maintain them?

1. During maintenance, start from the low-voltage side of the transformer. After the distribution cabinet is de-energized, clean the dust inside, check the integrity of the busbars and downlead connections, look for any signs of overheating or discoloration at the joints, inspect the cable heads and terminal blocks for firmness and reliability, check for rust on the grounding wires, and ensure the terminal blocks are securely fastened. All secondary circuit connections should be reliable, with insulation meeting the required standards.

During the inspection of drawer-type switches, the drawer-style switch cabinet should be flexible when pushed in or pulled out, and the mechanical interlock should be reliable. Check if the operating mechanism of the automatic air switch on the drawer cabinet is in place and if the wiring screws are tightened. Clean the dirt on the contactor terminals and around them, inspect the integrity of the contactor terminal contacts. If the contacts are not in good contact, lightly file the surface of the terminals if necessary. If the terminals are severely burned (the contact point wears down to 1/3 of the original thickness), the terminals should be replaced. The power indicator gauge and indicator lights are in good condition.

During the maintenance of the capacitor cabinet, first disconnect the main switch of the capacitor cabinet. Use a wire with a cross-sectional area of 10mm² or more to discharge each capacitor to ground individually. After visual inspection, ensure the housing is in good condition with no oil leakage. If the capacitor housing swells, it should be addressed promptly, including replacing the discharge device, the wiring screws for the control circuit, and the grounding device. After closing the circuit, perform debugging on the indicator section and the automatic compensation section.

4: Maintenance of circuit breakers in the power cabinet and联络cabinet: After disconnecting all loads, pull out the circuit breaker using the handle. Re-tighten the wiring screws and check if the spring force of the blade is as specified. Inspect for any cracks or damage in the arc extinguishing grid. Manually adjust the mechanical interlock to ensure accurate opening and closing. Check if the contacts are in good contact; if necessary, file the contact surface. Inspect the internal springs, washers, and screws for looseness, deformation, or detachment.