6 large maintenance rules for low-voltage distribution cabinets
First, the purpose is to ensure the normal and safe operation of the low-voltage power distribution cabinet and the control cabinets of various equipment .
Second, the scope is suitable for low-voltage distribution room power distribution cabinets, and the control cabinets of each equipment are implemented according to the relevant conditions.
III. Responsibilities The maintenance team of the Mechanical and Electrical Installation and Maintenance Engineering Department conducts a comprehensive inspection and maintenance every six months, and completes the maintenance work with the shortest power outage time.
Fourth, the content
1. Preparation:
A. Notify the tenants of the start and end of the power outage the day before the power outage of the power distribution cabinet.
B. Do all the preparatory work before the power outage, especially the preparation of the tools should be complete; and complete the maintenance work with the shortest power outage time.
2, maintenance procedures:
A. Perform segmented maintenance and maintain the security load section first.
B. Stop the security load, and the rest of the load will be used for the mains as usual. Disconnect the air switch for the security load mains, disconnect the generator air switch, set the generator selector switch to the stop position, disassemble the battery positive and negative lines, and hang the nameplate to prevent the generator from transmitting power.
C. Check whether there is any deformation at the busbar joint, whether there is any blackening of the discharge, and tighten the bolts. If the bolts are rusted, they should be replaced to ensure that the joints are tightly connected. Check the insulation on the mother for looseness and damage.
D. Use the handle to shake the total air out of the power distribution cabinet, check whether the main contacts have burnt marks, check whether the arc extinguishing cover is black and damaged, tighten the wiring screws, clean the dust inside the cabinet, and test the mechanical joint. Gate and opening situation
E. Take out the sub-switch cabinets from the drawer cabinet and tighten the terminals. Check the installation and wiring of current transformers, ammeters, and watt-hour meters, check the flexible reliability of the handle operating mechanism, tighten the air switch in and out, and clean the dust in the switchgear and the lead wire behind the power distribution cabinet.
F. When servicing the capacitor cabinet, first disconnect the capacitor main switch, discharge the capacitors one by one with 10MM2 or more wires, and then check whether the contactor, capacitor wiring screw and grounding device are good, check whether the capacitor has swelling phenomenon, and use The vacuum cleaner cleans the cabinet from dust.
G. After the maintenance of the security load section is completed, the generator can be started to supply power to the mains section.
H. Disconnect the low-pressure side air switch step by step, then disconnect the high-voltage side vacuum circuit breaker for the transformer, close the grounding switch, and suspend the “no switch, no work†sign.
I. After all the requirements of C, D, E, and F are required to maintain the power distribution cabinet, remove the safety device, disconnect the high-voltage side grounding switch, close the vacuum circuit breaker, observe the transformer is put into operation, and then go to the low-voltage power distribution cabinet. Level power transmission, and the security load is converted from generator power to mains power supply.
Five, safety precautions
1. Power should be checked after power failure.
2. When the power distribution cabinet is maintained in sections, an isolation device shall be installed at the junction of the live and unpowered distribution cabinets.
3. When operating the high-voltage side vacuum circuit breaker, wear insulated boots, wear insulated gloves, and have special personnel to monitor.
4. When servicing the capacitor cabinet, it is strictly forbidden to touch before the capacitor is discharged to the ground.
5. Before the power is sent, check whether the tools are left in the power distribution cabinet.
6. Relevant documents and records
1. Inspection work tickets;
2. Annual maintenance records of power distribution cabinets and control cabinets;
3. Equipment maintenance records.
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