Abstract: The high voltage switchgear in the power system will experience performance degradation and an increase in the failure rate of key components inside the cabinet after being corroded by moisture, posing a threat to the reliability of the power system. This article conducts simulated dehumidification experiments by designing and optimizing semiconductor condensation systems, and studies the dehumidification effect of semiconductor condensation dehumidification devices. The experiment used polyethylene film to construct a closed space with similar dimensions to the on-site switchgear. The results show that the average dehumidification rate of semiconductor condensing devices is higher than 0.25/h, and improving heat dissipation conditions can improve dehumidification efficiency. Compared to traditional electric heating dehumidification, semiconductor condensation dehumidification achieves moisture content control of switchgear from the source