A common box busbar is a type of power transmission equipment that concentrates multi-phase (usually three-phase) busbar conductors in the same metal casing. It is mainly used in scenarios such as power plants, substations, large industrial plants, and high-rise buildings to achieve the distribution and transmission of high current electrical energy.
1、 Components
The structure of the common box busbar is relatively compact, mainly composed of the following core components:
-Conductor: Usually made of copper or aluminum (copper conductors have better conductivity and aluminum conductors are cheaper), it is the core for transmitting current and is divided into three phases A, B, and C according to phase sequence (sometimes including neutral wire N).
-Insulation components: used to isolate conductors from shells and conductors from each other. Common materials include insulation partitions, insulators, etc., mostly made of epoxy resin, polytetrafluoroethylene, etc., to ensure insulation performance.
-Metal casing: usually made of aluminum alloy or steel plate, it plays a role in protecting internal conductors, shielding electromagnetic interference, heat dissipation, and preventing external contact, while also improving overall mechanical strength.
-Supporting and fixing components: such as brackets, fasteners, etc., used to stably fix conductors and insulation components inside the casing, ensuring a sturdy structure.
2、 Main features
-Centralized structure: The three-phase busbar is integrated into the same enclosure, which is compact in structure and occupies small space, suitable for scenarios with limited space.
-High current carrying capacity: The conductor cross-section can be designed according to demand, which can meet the current transmission of several hundred amperes to several thousand amperes and is suitable for industrial grade high load electricity.
-Strong sealing: The metal shell is completely sealed, which can effectively prevent dust, moisture, and small animals from entering, reducing the impact of external environment on internal conductors.
3、 Core advantages
-High safety: The enclosed shell prevents personnel from directly contacting live conductors, reducing the risk of electric shock; Simultaneously reducing the possibility of short circuits caused by external foreign objects.
-Easy installation and maintenance: The overall structure is standardized, can be prefabricated and assembled, and has high on-site installation efficiency; The shell is detachable, allowing quick access to conductors and insulation components during later maintenance.
-Good electromagnetic compatibility: The metal casing can shield the electromagnetic field generated by the conductor, reducing electromagnetic interference to surrounding equipment; It can also resist the influence of external magnetic fields.
-Excellent heat dissipation performance: There is a reasonable gap between the conductor and the shell, combined with the thermal conductivity of the metal shell, the heat dissipation effect is better than that of partially enclosed cables, and it can operate stably for a long time.
Overall, the common box busbar has become an important equipment for power transmission in industrial and large buildings due to its compact structure, safety and reliability, and adaptability to high currents.
