With the rapid development of my country's economy, the demand for electricity in the whole society is increasing. Both 110kV and 220KV substations use 10kV and 35kV voltage levels on the low-voltage side. With the increase of the main transformer capacity, the rated current on the low-voltage side of the transformer is also increasing.
large hollow aluminium conductor are becoming more and more technically and structurally difficult to meet the requirements of bus heating and short-circuit electromotive force, which causes additional losses and increases in skin effect coefficients, resulting in a decrease in current interception capacity and uneven current distribution. Especially when the capacity of a single main transformer is 180MVA and above, the 10kV outlet side of the main transformer not only has electrodynamic problems and heating problems of the busbar bridge itself, but also busbar bridge pillar insulators, steel frames, and concrete upper pillars and foundations near the busbar bridge. The steel bars inside induce heating problems caused by eddy currents in the electromagnetic field. large hollow aluminium conductor are used as a substitute for rectangular bus bars. It has the following characteristics:
Large current carrying capacity, good insulation performance, high mechanical strength, good heat dissipation, low temperature rise, etc.
