Simulation and measurement analysis on thermal balance of large current long size vertical isolated phase buses

Taking the Shuibuya hydropower station, Pengshui hydropower station and Three Gorges underground hydropower station as examples, calculates the thermal balance of their isolated phase buses (IPBs) under natural ventilation conditions. Compares the calculating results with the measured results. Puts forward the cooling mode of mixed ventilation, and calculates the coupling effect of natural ventilation and mechanical ventilation. Analyses the factors influencing the heat balance of the IPB. Provides references for ensuring the safe and reliable temperature distribution of the IPB and selecting the favorable cooling mode for similar projects.