A busbar (busbar duct) is a closed metal device composed of copper and aluminum busbar columns, used to distribute large power to various components of a distributed system. In indoor low-voltage power transmission trunk projects, wires and cables have increasingly been replaced, and are widely used in inter story power supply in high-rise buildings, plane power distribution in factories, interconnection between low-voltage cabinets, and incoming line systems at transformer connections. Next, the manufacturer of cable tray in Jinan will summarize the advantages of bus PK cable.
Current carrying capacity
Bus - large: 250A~5000A
Cable - Small: A single four core cable is generally 580A larger
Busbar - simple and refreshing: linear design, simple structure
Cable - intricate: multiple loops and complex wiring
Busbar - small: compact structure
Cable - Large: Approximately 3-4 times the size of the bus duct
Heat dissipation performance
Busbar - High: The busbar is of a dense structure, and the outer shell is made of aluminum alloy profiles with high thermal conductivity. The heat dissipation method is integrated heat conduction, with high heat conduction efficiency and good heat dissipation performance.
Low: The core insulation and outer insulation materials of the cable have poor heat dissipation performance, and when laid in multiple layers within the bridge, the heat dissipation performance is even worse.
Bus - height: 130/180 ℃
Cable - Low: 95/105 ℃
Bus - high: fewer circuits and fewer fault points
Cable - low: laying cables separately, with multiple loops and multiple fault points
Busbar - small: The length of a single section generally does not exceed 3 meters, which is time-saving, convenient, and low in installation cost.
Cable - Large: High technical difficulty, long construction cycle, multiple human factors, and multiple hidden dangers. The longer the route, the greater the difficulty of construction.
Bus - convenient: can be operated in the nearby plug-in box
Cable - tedious: operation inside the switchgear in the distribution room
Bus - Simple: The bus unit has strong universality and interchangeability, and all components can be disassembled and reassembled for use; System expansion can increase both the length of the bus and the number of tapping units (plug-in boxes).
Cable - Complex: System expansion requires adding loops, and cables must be re led from the distribution room to the equipment.
Cost of use
Taking a 1000 meter long 800A transmission line as an example:
Summary of Comparison between Busbars and Cables:
1. Can meet the rated current of up to 5000A; And multiple cables need to be connected in parallel.
2. The 5000A LD bus section is only 240x180mm, saving space, while cables require a lot of space.
3. The bus duct can be controlled near the equipment, while the cables must be controlled in the distribution room.
4. The busbar is equipped with standard installation brackets, without the need for other supports; The cables must be laid using separate trays or pipelines.
5. The service life of the bus duct can reach 50 years and can be reused. The cable is short and cannot be reused.
6. The tapping interface of the busbar duct can add tapping circuits, and the cables must be laid in the distribution room.
7. The insurance cost for installing busbars is relatively low, while cables are relatively high.
That's all for the comparison between bus ducts and cables. I hope it can provide you with effective assistance. For more information, please visit our website Consult and understand!