基于时序InSAR技术的输电设备地基稳定性监测

    Foundation stability monitoring of transmission equipment based on time series InSAR technology

    • 摘要: 变电站和输电杆塔是重要的输电设备,其地基或所在斜坡产生的变形可能会导致严重的后果,研究应用小基线子集干涉合成孔径雷达(small baseline subset interferometric synthetic aperture radar,SBAS-InSAR)技术对红河哈尼族彝族自治州蒙自县内变电站与杆塔所在区域进行了时序动态监测,以精确探测变电站及附近区域的地表形变动态。研究发现,变电站地表变形呈现南升北降的趋势,西北部下沉尤为严重,验证了先前设施异常报告。需特别指出,N170与N168节点自2022年8月起,抬升速率出现突变,N170南部采样点抬升量突出,凸显地表沉降不均匀性。据此,建议尽快加强变电站维护,特别是南部和西北部地基加固,以防结构失稳和停电风险,并需细致探究附近杆塔南部特殊沉降。研究不仅为该变电站提供了科学运维依据,还为同类电力设施地质稳定监控、风险预警策略及预维护规划树立了模型,有效提升了电力系统的安全韧性与灾害防御能力。

       

      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.

       

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