[routine inspection and maintenance items of vacuum circuit breaker]: 1. Check that there is no heating and discoloration at the connection between the circuit breaker and the bus, and that the connecting bolts are not fallen off; 2. Check that the porcelain bottle of the arc extinguishing chamber of the circuit breaker and the support porcelain bottle of the circuit breaker are clean, free of cracks and discharge; 3. Check that the contact cover of the circuit breaker is free of cracks and discharge traces; 4. Check that there is no abnormal discharge sound inside the circuit breaker

1. Check that there is no heating and discoloration at the connection between the circuit breaker and the bus, and the connecting bolts are not dropped;

2. Check the porcelain bottle of the arc extinguishing chamber of the circuit breaker and the support porcelain bottle of the circuit breaker for cleanness, crack and discharge;

3. Check that the contact cover of the circuit breaker is free of crack and discharge trace;

4. Check that there is no abnormal discharge sound inside the circuit breaker;

5. The spring energy storage mechanism is in the stored energy state, and the stored energy indicator light is on;

6. The opening (closing) position indication of the circuit breaker is normal and consistent with the current operation condition;

7. The secondary wiring terminal shall be free of disconnection;

8. Check that the position displayed on the workstation is consistent with the actual situation.