Low voltage bus ducts are divided into air type and dense type. Air type has been basically eliminated, and its disadvantages are very obvious. The main disadvantages are: large volume and poor heat dissipation. Due to strength issues, the shell cannot be made of rust proof and beautiful aluminum alloy. Some people may mistakenly believe that air ventilation is better than dense heat dissipation, because air circulation is beneficial for heat dissipation, but this is not the case in reality. The three elements of heat dissipation are convection, radiation, and conduction. The reason why air type bus ducts have poor heat dissipation is that they are closed at both ends and separated by insulation brackets between each section. Therefore, air cannot circulate inside the bus duct, and air is not a good heat conduction medium, resulting in poor convection and conduction heat dissipation. Due to its large volume, the rated current of air type bus ducts generally does not exceed 1000A. Due to the large phase to phase distance, air type bus ducts suffer from severe eddy currents near the steel plate shell of the bus duct, especially for large capacity bus ducts, where eddy current losses are even more severe.

Dense busbar trunking has strong heat dissipation capability due to multiple conductive bars tightly pressed together and in contact with the casing. Dense bus ducts with the same capacity are much smaller than air ducts, so dense bus ducts can produce large capacity ones with a rated current of 6300A. Due to the close compression of the conductive wires in each phase, the sum of the magnetic field vectors generated by the current in the surrounding area is essentially zero, resulting in minimal eddy current losses in the surrounding steel plate casing.

Yunnan Youtong Electric Co., Ltd. is a professional manufacturer of busbar trunking cable trays with high cost-effectiveness. Crafted with ingenuity, it is durable and comes in a complete range of specifications at a low price. If you need it, please feel free to call us for consultation!