Abstract
In the electromechanical design of highway tunnels, the calculation of voltage drop during fan start-up is an important part of electrical design, which is related to the safe operation of the whole system, green and energy-saving. The voltage drop involves the setting of substations, and ultimately affects the tunnel engineering scheme. In this study, a theoretical analysis, by calculating the voltage drop when the axial-flow fan starts was implemented. The method was used to calculate and verify the Milashan tunnel section of the 318 National Highway from Linzhi to Lhasa. The method can provide reference for peer designer in similar electromechanical design.
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