Abstract:
Substations and transmission towers are important transmission equipment, and the possible deformation of their foundations or slopes may lead to serious consequences. The time series dynamic monitoring of Mengzi substations and towers in Honghe Hani of Yi Autonomous Prefecture was studied with the method of Small Baseline Subset Interferometric Synthetic Aperture Radar (SBAS-InSAR) to accurately detect the surface deformation dynamics of substations and nearby areas. The study found that the substation surface deformation showed a trend of rising in the south and falling in the north, and the subsidence in the northwest was particularly serious, which verified the previous report of facility anomalies. In particular, the uplift rate of N170 and N168 nodes has changed abruptly since August 2022. The uplift of the sampling point in the south of N170 is prominent, highlighting the unevenness of surface subsidence. Accordingly, it is recommended to strengthen the maintenance of the substation as soon as possible, especially the foundation reinforcement in the south and northwest. So structural instability and power outage risks were prevented, and the special settlement in the south of the nearby towers need to be carefully explored. This study could not only provide scientific basis for the operation and maintenance of the substation, but also establish a model for the geological stability monitoring, risk early warning strategy and pre-maintenance planning of similar power facilities, which could effectively improve the safety resilience and disaster prevention ability of the power system.