REDUCING THE METAL CAPACITY OF NON-INSULATED FLAT POWER BUSBAR

Abstract

A method for reducing the metal conductivity of aluminum and copper flat rectangular cross-section, non-insulated high-power electrical conductors is proposed. It has been shown that the formation of irregularities on the lateral surface of rectangular cross-section by rolling in accordance with GOST 21474-75 allows to increase the area of ​​the rectangular cross-section by more than 40%. An increase in the area of the side surface by rolling does not lead to a change in the cross-sectional area, therefore, the thermal stability of electrical busbars to short-circuit currents does not change. The results of the analysis of the thermal processes of heating busbars with a long-term flowing current showed that in the established mode, an increase in the side surface area leads to an intensification of heat transfer processes. The increase in the lateral surface under normal operating conditions is accompanied by an intensification of heat exchange processes, which leads either to a decrease in the overheating temperature, or, if the maximum permissible overheating values ​​are maintained, to an increase in the power of non-insulated flat conductors 1.19 times, which, in turn, allows the use of conductors with a smaller cross-section for a long time, reducing the weight of aluminum and copper flat electrical wires per linear meter by more than 20%.