Intelligent distribution cabinet

High voltage distribution cabinet

Distribution cabinets play a vital role in the power system. They can be divided into different levels and types according to their location and purpose in the power system. The following is a detailed analysis of the classification and types of distribution cabinets:

1. Classification of distribution cabinets
   Primary distribution equipment
   Also known as power distribution center, these devices are usually installed in the substation of the enterprise.
   Their main function is to distribute electric energy from the high-voltage side to the lower-level distribution equipment at different locations.
   Since the primary distribution equipment is close to the step-down transformer, its electrical parameter requirements are higher and the output circuit capacity is also larger.
   Secondary distribution equipment
   It is a general term for power distribution cabinets and motor control centers.
   Power distribution cabinets are usually used in places where the load is relatively dispersed and there are fewer circuits, while motor control centers are used in places where the load is concentrated and there are more circuits.
   The main function of the secondary distribution equipment is to distribute the electric energy of a circuit of the upper-level distribution equipment to the nearest load, and provide protection, monitoring and control for the load.
   Final distribution equipment
   Generally known as lighting power distribution boxes, these devices are far away from the power supply center and are dispersed small-capacity distribution equipment.
   The final power distribution equipment is mainly used to distribute electric energy to the final power-consuming equipment, such as lighting fixtures, motors, etc.
2. Types of power distribution cabinets
   According to the structural type
   Fixed panel switch cabinet: an open switch cabinet with a panel shield, which has a protective function on the front, and the live parts can still be touched on the back and sides, and the protection level is low.
   Protective (enclosed) switch cabinet: a low-voltage switch cabinet with all sides enclosed except the mounting surface, which can be installed against the wall or away from the wall.
   Drawer-type switch cabinet: a closed shell made of steel plate, and the electrical components of the incoming and outgoing line circuits are installed in a removable drawer, forming a functional unit that can complete a certain type of power supply task.
   According to the purpose
   Power distribution cabinet: mainly used to provide power for power equipment (such as motors).
   Lighting distribution cabinet: mainly used to provide power for lighting equipment.
   Metering cabinet: used to measure and record the amount of power supplied.
   Busbar cabinet: when the system has two power supply lines, and the two lines are standby for each other, it is used to connect the main busbars of the two power supplies.
   PT cabinet: Install metering devices and transformers.
   Capacitor cabinet: Usually connected to the main busbar of the system for centralized reactive power compensation.
   Contact cabinet: Used to connect several rows of low-voltage cabinets with several transformers. When a transformer fails, another one can be used to drive other rows of low-voltage cabinets.
   Ring network cabinet (switch cabinet): Load switch cabinet is used for ring network power supply.
   Battery cabinet: Equivalent to a battery, storing power, used as the main power source for backup operating power or closing power.
   Frequency conversion cabinet: A control cabinet that uses a frequency converter to drive a power device.
   In addition, there are some special types of distribution cabinets, such as high-voltage switch cabinets, center cabinets, etc., which are usually used for power distribution and control of high-voltage power systems.

In summary, there are many types and classifications of distribution cabinets, and choosing a suitable distribution cabinet is crucial to ensure the stable operation of the power system. In practical applications, the appropriate type of distribution cabinet should be selected according to specific needs and scenarios.