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Daily Maintenance and Care Manual for Low-Voltage Switchgear: Secrets to Extending Equipment Lifespan
Release time:
2025-09-22
Author:
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Abstract
Low-voltage switchgear is a critical piece of equipment in power systems, and its stable operation directly ensures the safety of the electricity supply. Regular maintenance not only helps prevent failures but also significantly extends the equipment's lifespan and reduces operational costs.
I. Daily or Weekly Routine Inspections
Daily inspections are the first line of defense in identifying potential issues. Inspection personnel should pay particular attention to the following points:
Visual inspection:
Check the cabinet for deformation, rust, or paint chipping.
Are the cabinet doors and instrument doors intact, and are the sealing strips aged?
Observe whether the switches, front end, and instrument readings are functioning properly.
Environmental Check:
Check that the environment around the switchgear is clean, free of dust and debris.
Ensure the cabinet has proper ventilation and is free of blockages.
Check whether the ambient temperature and humidity are within the equipment's specified range.
Running status check:
Perform an auditory check for any abnormal sounds, such as discharge noises, arc sounds, or mechanically induced vibrations.
Check for any unusual odors, such as the smell of burning insulation, using your sense of smell.
Check each connection point and contact for abnormal heating using tactile inspection or an infrared thermometer.
II. Regular Maintenance and Servicing (Quarterly or Every Six Months)
Regular, in-depth maintenance should be performed by a professional electrician or maintenance team, and primarily includes the following aspects:
Power-off cleaning:
Important note: Before performing any maintenance operations, it is mandatory to Completely disconnect all power sources , and hang up a warning sign reading, "Work in progress—Do not close the switch."
Use dry compressed air or a vacuum cleaner to remove dust and debris from inside the cabinet and from the equipment. Pay special attention to cleaning components such as busbars, brackets, contactors, and relays.
During the investigation:
Check all terminal blocks, bolts, and screws for looseness. Loose connections are a major cause of failures.
Use the collector to readjust the bolts at busbars, cables, and equipment connection points according to the manufacturer's specified collection values.
Equipment Function Testing:
Fixture: Manually operate the fixture's opening and closing mechanism to ensure smooth and reliable operation. Also, verify that its latching function is working properly.
Contactors and Latching Relays: Check the contacts for erosion or arcing. If severe erosion is detected, replace them promptly.
Second Circuit: Check the control circuit and protection circuit for short-circuit tests, and verify whether insulation has been reset. Also, confirm that the operating values and operating times of the protective relays meet the specified requirements.
Insulation check:
Use a megohmmeter (shake meter) to measure the insulation resistance of the main circuit and control circuit, ensuring they meet national standards.
Check insulators and insulating partitions for gaps, cracks, or stains.
Replacing wear parts:
Based on the equipment's operating time and condition, promptly replace aged or worn-out components, such as seals, lanes, buttons, and more.
3. Fault Handling and Documentation
Troubleshooting: When any abnormality is detected, operation should be stopped immediately, and a qualified professional should investigate and address the issue. Operating with faults is strictly prohibited.
Maintenance Record: Establish detailed maintenance record files, including the time, content, issues identified, and outcomes of each maintenance activity. These records serve as crucial evidence for analyzing equipment performance trends and developing more scientific maintenance plans.
IV. The Secret to Extending Equipment Lifespan
Environmental Control: Ensure the room housing the switchgear remains dry, clean, and well-ventilated. Avoid dampness, suppress gases, and maintain a cool environment.
Standard Operating Procedures: Operate strictly according to the equipment operating procedures to avoid misoperations.
Professional Maintenance: Ensure that maintenance work is carried out by qualified professionals equipped with the appropriate credentials.
Preventive Maintenance: From "reactive maintenance" to "preventive maintenance," we avoid failures through regular inspections and upkeep.
By following the maintenance steps outlined above, you can significantly reduce the failure rate of low-voltage switchgear, ensuring the safe and stable operation of the power system—and thereby effectively extending the equipment's service life.
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