High-voltage circuit breakers, also known as high-voltage switches, are important electrical appliances in high-voltage electrical equipment. In normal operation, it can be used to connect or disconnect the load current; in the event of a short-circuit fault or severe overload, it can be used to automatically and quickly trip off the overload current or short-circuit current with the help of the protective relay device to prevent the expansion of the accident.
There are many types of high-voltage circuit breakers, but their main structures are somewhat similar, including arc extinguishing chamber, conductive circuit, shell insulation support, operation and transmission parts.
High-voltage circuit breakers can be divided into high-voltage oil circuit breakers (also known as high-voltage switches), high-voltage air circuit breakers (also known as high-voltage air switches), and high-voltage vacuum circuit breakers (also known as high-voltage vacuum switch) etc.
High-voltage oil circuit breakers are further divided into two types: oil-less high-voltage circuit breakers and multi-oil high-voltage circuit breakers. The oil in the multi-oil type high-voltage circuit breaker can not only extinguish the arc, but also insulate the charged body (ie, the contact rod of the circuit breaker switch) and the switch shell. Therefore, the shell of the multi-oil type high-voltage circuit breaker is not charged, and the manufacturer usually paints it gray or black to show the difference.
Oil-less high-voltage circuit breakers contain very little oil, and these oils only serve to extinguish the arc. The shell is generally live and must not be touched during work, so it is painted red to warn.
The varieties of high-voltage circuit breakers include magnetic blowing circuit breakers, solid gas generating circuit breakers, and sf6 circuit breakers.
