High voltage switchgear is an indispensable part of high-voltage and low-voltage complete sets of equipment, which plays an important role in the power system. Then, what maintenance work should we do for high-voltage and low-voltage electrical complete sets of equipment in daily use?
（1） Check and clean the switch cabinet. The cabinet is clean without dust. The observation window on the cabinet is clean and transparent.
（2） The cabinet components of high and low voltage complete sets of equipment are installed correctly, the wiring is firm, the watt hour meter, high voltage live indicator, relay and signal lamp work normally, and meet the relevant regulations. Check that the switch position indicator is correct.
（3） Check that the switch cabinet is well sealed, the door locks are complete, the mechanical and electrical live locking devices are reliable, and the cabinet door cannot be opened when there is electricity. The function of the travel switch for handcart position detection is good, which can correctly reflect the position of handcart. The mechanical position locking device works well. Check whether the secondary circuit of high and low voltage electrical equipment is firmly connected and the wiring is correct.
（4） Pull out the handcart, check the high and low voltage electrical equipment, and check that the electrified protection baffle at the back of the switch cabinet works well, and the switch handcart can reset automatically after pulling out.
（5） Check that the cabinet of high and low voltage complete equipment is well grounded, the grounding rail of handcart is in good contact, and the surface is free of corrosion. The push and pull of the handcart should be easy and flexible, and it can automatically lock and locate when it is in place without jamming.
（6） Current transformer and overvoltage absorption device. Wipe the surface of transformer and over-voltage absorption device with cloth, and check the fastening of primary wiring of high and low voltage electrical equipment. Check whether the secondary terminal and iron core of the transformer are well grounded.