Switch cabinet
What is a switchgear? It is an electrical equipment. The external line of the switch cabinet enters the main switch in the cabinet first, and then enters the sub control switch. Each branch is set according to its needs. For example, instruments, automatic control, motor magnetic switches, various AC contactors, etc., some are also equipped with high-voltage chamber and low-voltage chamber switchgear, high-voltage buses, such as power plants, etc., and some are also equipped with low cycle load shedding for main equipment. The main function of switch gear is to open and close, control and protect electric equipment in the process of power generation, transmission, distribution and energy conversion in the power system. The components in the switchgear mainly include circuit breaker, disconnector, load switch, operating mechanism, transformer and various protective devices. There are many ways to classify switchgear, for example, it can be divided into movable switchgear and fixed switchgear through the installation of circuit breaker; Or according to different cabinet structures, it can be divided into open type switchgear, metal enclosed switchgear, and metal enclosed armored switchgear; According to different voltage levels, it can be divided into high-voltage switchgear, medium voltage switchgear and low-voltage switchgear. It is mainly applicable to various occasions such as power plants, substations, petrochemical industry, metallurgical steel rolling, light industry and textile, factories and mining enterprises, residential quarters, high-rise buildings, etc. "Five prevention" of high-voltage switchgear 1. After the vacuum circuit breaker trolley in the high-voltage switch cabinet is closed at the test position, the trolley circuit breaker cannot enter the working position. (Prevent on load closing) 2. When the grounding knife in the high-voltage switch cabinet is closed, the trolley circuit breaker cannot be closed. (Prevent closing with grounding wire) 3. When the vacuum circuit breaker in the high-voltage switch cabinet is closing, the rear door of the panel cabinet is locked with the cabinet door by the machine on the grounding knife. (Prevent from entering the electrified compartment by mistake). 4. The vacuum circuit breaker in the high-voltage switch cabinet is closed during operation, and the grounding switch cannot be put into operation when closing. (Prevent electrified grounding wire) 5. The vacuum circuit breaker in the high-voltage switch cabinet cannot exit the working position of the trolley circuit breaker when it is working and closing. (Prevent loaded broach)