Pay attention to the maximum temperature rise of Bus duct

2025-10-16 11:24:07

What is the maximum temperature rise of Bus duct? The maximum temperature rise of an Fire resistant bus duct refers to the temperature rise obtained by subtracting the ambient temperature from the maximum temperature of the Fire resistant bus duct when operating at full load through the rated current. Usually represented by K. Temperature rise limit tests will be conducted during busbar design. The temperature rise limits the current carrying capacity of the busbar. An increase in temperature will shorten the lifespan of the busbar, increase power loss, and reduce voltage. It also affects the ambient temperature and accelerates the insulation material of surrounding equipment. Aging can even cause safety accidents.

In China, fire accidents caused by electricity account for over 60% of the total number of fire accidents. The perpetrators of fire accidents caused by electricity include cables, wires, high and low voltage complete equipment, transformers, Low voltage bus duct, electrical components, etc. Most of them are caused by long-term temperature rise and heating, leading to aging of insulation materials and short circuits caused by fire accidents.

The maximum temperature rise can be said to be the most critical safety technical parameter of High-voltage bus duct, and also an important indicator of the overall performance of Bus duct. Users can also learn about the following issues from the temperature rise of the busbar:

① The purity of copper bars: The copper content is directly related to the electrical resistivity of the conductor. The higher the resistivity of the same conductor specification, the higher the temperature rise.

② Conductor cross-sectional area: Conductors with the same structure and process, as well as the same copper content, have a smaller cross-sectional area and naturally higher temperature rise.

③ The heat dissipation performance of Bus duct: Insulation materials and shell structures are not conducive to heat dissipation, resulting in naturally high temperature rise.  

④ Quality of connector structure: If the connector does not make contact, the temperature rise will be higher.