Bus bar temperature rise and cooling method

Dense busbar trough is suitable for AC three-phase four-wire, three-phase five-wire system, frequency 50~60Hz, rated voltage up to 690V, rated working current 250~5000A supply and distribution system, as auxiliary equipment for supply and distribution equipment in industry, mining, enterprises and high-rise buildings, especially suitable for the transformation of workshops and old enterprises. The joint of the dense busbar trough is fastened with insulating bolts, while the double connection copper row is used to connect, effectively increasing the contact area of the joint and greatly reducing the temperature rise of the joint part. The conductive rows of the dense busbar are wound with flame-retardant cross-linked polyethylene heat-shrinkable sleeves, which have strong insulating properties and do not emit toxic gases in the event of fire.


If the temperature of a dense busbar trough is too high, it will fail. In order to be safe, we need to understand the way to cool down the dense busbar trough to avoid the high temperature affecting the busbar.

Low-voltage transmission line wire, cable, cable, branch dense busbar trough,bare conductive bar, puncture cable, etc. Because different products different thermal performance, current-carrying capacity per square millimeter also varies. The same product, the same size wire, through the same current, when the temperature rises heat dissipation performance will also change; due to different designs of cross-sectional area, the temperature rise is also different. Of course, when the temperature rises and the resistance value increases, the pressure increases and the energy loss increases.

Dense busbar trough is the same, therefore, the conductivity dense busbar conductor is calculated according to the flow per square millimeter is wrong, structural design, heat dissipation, but different impedance, inductance and other factors are closely related to the current carrying capacity. So gb7251 - 2006 national standard stipulates that the rated current limit temperature rise to determine the current carrying capacity dense busbar trough.

So the laying of dense busbar troughs must be measured on site, the length of the installation line troughs requires high accuracy, and the height of the plug-in switch box of dense busbar troughs should also be determined according to the design. When the fire distribution lines are concealed, they should be laid inside the non-combustible structure, and the thickness of the protective layer should not be less than 30 mm. when laid in the open, the metal pipes or metal trunking are protected with fireproof paint, because the metal pipes and metal trunking themselves do not have fireproof performance. When the use of insulation and sheathing for non-flammable materials of the cable, in the shaft may not wear metal pipe, metal groove protection, but the line through the shaft floor, must pass through the plate pipe, slot protection, the upper and lower two ends of the pipe, slot mouth gap should also be made to seal the compartment.


Post time: May-04-2023