source：jinzhong transmission and distribution time：2020-11-24 Number of hits：1281of hits
classification
Commonly used distribution box has two kinds of wood and metal, because the protection level of metal distribution box is higher, so it is still metal.
Classification according to structural features and uses:
(1) Fixed panel type switch cabinet, often called switch board or distribution panel. It is a kind of open switch cabinet with panel barrier. The front side has protective function, and the back and side can still touch the live parts. The protection level is low. It can only be used in industrial and mining enterprises with low requirements for power supply continuity and reliability, and can be used for centralized power supply in substation.
(2) Protective (i.e. closed) switch cabinet refers to a low-voltage switch cabinet with all sides closed except the installation surface. The switch, protection, monitoring and control and other electrical components of the cabinet are all installed in a closed enclosure made of steel or insulating materials, and can be installed reliably on or off the wall. Each circuit in the cabinet can be isolated without isolation measures, or grounded metal plate or insulation board can be used for isolation. Generally, the door is mechanically interlocked with the main switch operation. In addition, there is a protective platform type switch cabinet (i.e. console), the panel is equipped with control, measurement, signal and other electrical appliances. Protective switch cabinet is mainly used as power distribution device in process field.
(3) Drawer type switch cabinet. This kind of switch cabinet is made of steel plate, and the electrical components of the incoming and outgoing circuits are all installed in the extractable drawer, forming a functional unit that can complete a certain type of power supply task. The functional unit is separated from the bus or cable by grounded metal plate or plastic functional board, forming three areas of bus, functional unit and cable. There are also isolation measures between each functional unit. Most of the switch cabinet and drawer are switch cabinet with high reliability. They are suitable for industrial and mining enterprises and high-rise buildings which require high reliability of power supply as centralized control power distribution.
(4) Power and lighting distribution control box. Most of them are closed vertical installation. Due to the different use occasions, the protection level of the shell is also different. They are mainly used as power distribution devices on the production site of industrial and mining enterprises.
There are two types of distribution box structures
1. Welding structure: simply cut, bend, open holes and then weld the sheet metal parts.
2. Assembly structure: the sheet metal parts are processed separately, and each part is assembled after being processed. The screw and tee joint are used to reinforce and lock. The appearance is beautiful and the operation is simple, which can save a lot of transportation costs.
Distribution box and distribution cabinet, distribution board, distribution panel, electrical cabinet, etc. are complete sets of devices for centralized installation of switches, instruments and other equipment.
principle
Jinzhong Power Transmission and distribution sharing to the distribution box is to assemble the switchgear, measuring instruments, protective appliances and auxiliary equipment in a closed or semi enclosed metal cabinet or panel according to the requirements of electrical wiring to form a low-voltage distribution box. In normal operation, the circuit can be connected or disconnected by manual or automatic switch. In case of fault or abnormal operation, the circuit is cut off or the alarm is given with the help of protective appliances. With the help of measuring instrument, various parameters in operation can be displayed, and some electrical parameters can be adjusted to prompt or send signals to deviate from normal working state.
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