强电磁条件下山区软基变电站变形监测技术应用研究

Research on deformation monitoring technology of transformer substation on soft foundation in mountainous area under strong electromagnetic condition

针对变电站变形监测技术现状的不足,选取昭通某220kV变电站开展强电磁条件下变形监测技术应用研究。现场监测分别采用北斗卫星定位技术、激光测距技术、倾角计、雨量计进行。取得研究成果如下:(1)强电磁干扰已对全球导航卫星系统(GNSS)的监测精度产生严重影响,若不能有效降低电磁干扰影响,GNSS位移监测的结果将不能直接用于变电站基础变形监测分析。(2)基于变电站电磁场强度探测,提出一种强电磁场环境下提高变电站GNSS沉降监测精度的监测点位设计及实施方法,将使用电子元器件的监测点布置在电磁场强度相对较弱的部位,以减小电磁场干扰及监测误差。(3)首次将低成本高精度的激光测距技术引入变电站水平位移监测中,并成功实施。项目研究成果为山区软基变电站变形监测增加了新的技术手段,可提升变电站工程质量和管理水平。

In view of the deficiency of deformation monitoring technology in transformer substation,a 220 kV substation in Zhaotong is selected to carry out research on deformation monitoring technology under strong electromagnetic condition.The field monitoring is performed by Beidou satellite positioning technology,laser ranging technology,inclinometer and rain gauge.The research results are described as follows:(1)Strong electromagnetic interference has a serious impact on the monitoring accuracy of global navigation satellite system(GNSS).If the influence of electromagnetic interference cannot be effectively reduced,the results of GNSS displacement monitoring cannot be used for monitoring and analysis of substation foundation deformation.(2)Based on the detection of substation electromagnetic field intensity,a monitoring point design and implementation method to improve the settlement monitoring accuracy of substation GNSS under strong electromagnetic field environment is proposed.The monitoring points with electronic components are arranged at the places with relatively weak electromagnetic field intensity to reduce electromagnetic interference and monitoring error.(3)For the first time,the low-cost and high-precision laser ranging technology is introduced into the substation horizontal displacement monitoring and successfully implemented.The research provides a new technical means for deformation monitoring of substation on soft foundation in mountainous area,which can improve the quality and management level of substation project.