1. The ring network cabinet should be inspected under the following conditions:
1) After 100 full load operations, the resistance and insulation level of the main circuit of the load switch should be checked, and it can be sent to the manufacturing factory for major repair depending on the situation;
2) After 10000 unloaded operations, the mechanism characteristics and mechanical operation of the load switch should be checked.
2. Regularly record the indicated data of the SF6 gas pressure gauge, and replenish air in a timely manner according to the SF6 gas status curve, with a normal non replenishing time of 15 years.
3. Regularly check if there are any abnormal situations in the ring network cabinet, and take timely measures once found.
4. Operators should be familiar with all parts of the ring main unit, including structural performance and installation.
