How to maintain high and low voltage switchgear.
High voltage switchgear is an indispensable part of power transmission and transformation equipment, and plays an indispensable role in the entire power system. It is used for power generation, transmission, distribution, power conversion and consumption in the power system to make or break, control or protect, and is widely used in building materials, metallurgy, electricity, chemicals, ships, railways, light industry and other industries. Low voltage distribution equipment for polycrystalline silicon ingots is widely used in engineering applications, mainly due to the use of AC induction heating for melting. The main reason is that through AC disturbance stirring, the growth of grains is continuously interrupted, causing the grains to become small and polycrystalline, resulting in grain refinement. Therefore, it is extremely precious to do a good job in the daily maintenance of high-voltage switchgear. To maintain a high-voltage switchgear, the following six points need to be achieved first:
（1） Check and clean the switchgear, ensuring that the cabinet is clean and free of dust. The observation window on the counter is clean and transparent.
（2） The cabinet components are installed upright, the wiring is firm, and the electricity meter, high-voltage live indicator device, relay, and signal light are working normally and in compliance with relevant regulations. Check that the switch position indicator light is indicating correctly.
（3） Check that the switchgear 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 polysilicon ingot casting furnace is the key equipment for polysilicon manufacturing in the complete set of power equipment. The stability of its process flow, the stability and progressiveness of equipment control are directly related to whether qualified silicon ingots can be produced, and the qualified silicon ingots directly determine the photoelectric conversion efficiency of cells made of silicon chips. The handcart position detection travel switch works well and can correctly reflect the handcart position. The mechanical position locking device of the switch works well. Check that the secondary circuit is securely connected and wired correctly.
（4） Pull out the handcart and check that the live protective barrier at the back of the switch cabinet is functioning properly. The switch handcart will automatically reset after being pulled out.
（5） Check that the cabinet is well grounded, the handcart grounding track is in good contact, and there is no rust on the surface. The polysilicon ingot casting furnace is the key equipment for polysilicon manufacturing in the complete set of power equipment. The stability of its process flow, the stability and progressiveness of equipment control are directly related to whether qualified silicon ingots can be produced, and the qualified silicon ingots directly determine the photoelectric conversion efficiency of cells made of silicon chips. The handcart should be easy and flexible to push and pull, and automatically lock and position when in place, without any jamming phenomenon.
（6） Current transformers and overvoltage absorption devices. Wipe the surface of the transformer and overvoltage absorption device with a cloth and check the tightness of the wiring once. Check that the secondary terminal and iron core of the transformer are well grounded.
