1. Daily maintenance
1. Check that the cables should be neatly arranged without mechanical damage, and the signs should be complete, correct, and precise.
2. Check whether the ceramic sleeve of the cable terminal is damaged, cracked and dirty, and discharged.
3. Check that the connection of the cable terminals is reliable and there is no overheating and looseness.
4. Check the cable terminal for oil leakage, glue leakage, breakage, and burning.
2. Annual maintenance
1. The preventive test should be carried out according to the requirements of the preventive test.
2. Remove dust check cable trenches and cable wells for debris, water accumulation, collapse, etc.
3. Deal with all kinds of defects found
3. Inspection after the operation
| Check item | Check location | Inspection standards | Detection method |
| Cable phase sequence | cable terminator | Comply with the wiring sequence before the operation | Visual, Manual |
| Legacy | On-site | All tools and utensils are collected and counted, and the work surface is clean and hygienic | Visual, Manual |
| Connection part | Cable connector | The connection is tight, the appearance is good, and the wiring is correct. | Visual, Manual |
4. Common faults and handling
Loose cable end overheating.
Exit the relevant equipment, take organizational and technical measures to ensure safety, and discharge the cables before operation.
Re-tighten, or re-wrap the insulation, or re-make the cable head depending on the hot spot
Cable Termination Porcelain Sleeve Pollution Flashover
Exit the faulty equipment, take organizational and technical measures to ensure safety, clean and descale the faulty porcelain sleeve, and test power transmission for observation
If cleaning cannot eliminate the meter body's cracks, you should select qualified spare parts for replacement. 5.3 Cable insulation resistance is low
Shake the insulation according to the regulations' requirements and compare the historical data. If the difference is slight, it can be put into operation, but inspections should be strengthened.
Compared with the historical data, if the difference is significant, a DC withstand voltage test should confirm the insulation condition.