The content and steps of maintenance for low-voltage distribution boxes.
The rated current of the low-voltage distribution box is AC 50Hz, and the rated voltage of the distribution system is 380V, which is used for the conversion and control of electrical energy for power, lighting, and distribution. This product has strong breaking ability, good dynamic and thermal stability, flexible electrical scheme, easy combination, strong series and practicality, and novel structure.
The maintenance of low-voltage distribution boxes is mainly to ensure the normal and safe operation of low-voltage distribution cabinets. We need to conduct an annual comprehensive physical examination and maintenance of the low-voltage distribution box in Fuzhou. Complete maintenance with minimal power outage time, usually by determining the owner's power outage time in advance.
The maintenance content and steps of low-voltage distribution box:
1: Maintenance should start from the low voltage side of the transformer. After the power supply of the distribution cabinet is cut off, clean the dust in the cabinet, check whether the busbar and down lead connections are good, whether the joint points are heated or discolored, check whether the cable head and wiring pile head are firm and reliable, check whether the grounding wire is corroded, and whether the wiring pile head is fastened. All secondary circuit wiring connections are reliable and the insulation meets the requirements.
2: When checking the drawer switch, the drawer switch cabinet should be flexible when pushed in or pulled out, and the mechanical locking should be reliable. Check if the automatic air switch operating mechanism on the drawer cabinet is in place and if the wiring screws are tightened. Clean the dirt on the surface and around the contactor contacts, check if the contactor contacts are intact. If the contact is poor, it may be necessary to slightly file the contact surface. If the contact is severely eroded (the contact point is worn to 1/3 of its original thickness), the contact should be replaced. The power indicator instrument and indicator light are intact.
3: When repairing the capacitor cabinet, the main switch of the capacitor cabinet should be disconnected first. After discharging the capacitors to the ground one by one with a wire of more than 10mm2, the appearance of the shell should be checked and there should be no oil leakage. If the capacitor shell expands, it should be dealt with in a timely manner, and the wiring screws and grounding devices of the discharge device and control circuit should be replaced. After closing, debug the indicator and automatic compensation parts.
4: Maintenance of circuit breakers in the power receiving cabinet and contact cabinet: First disconnect all loads, then use a handle to shake out the circuit breaker. Re tighten the wiring screws and check if the elasticity of the blade meets the requirements. Check if the arc extinguishing barrier is broken or damaged, manually adjust the mechanical interlock for accurate opening and closing, check if the contact is in good contact, file the contact surface if necessary, and inspect the internal springs, washers, and screws for looseness, deformation, and detachment.
