模拟强震后高压输电接续管漏磁的检测方法研究

A Magnetic Flux Leakage Detection Method for High-voltage PowerTransmission Splicing Sleeves after Strong Earthquakes

摘要:

为维持强震影响下电力系统安全运行，改善高压输电效率及输电质量，提出强震影响下高压输电接续管漏磁检测方法。采用磁敏传感器获取漏磁通内的漏磁信号，通过计算提取接续管内漏磁信号特征量，依据这些特征实现高压输电接续管漏磁检测。构建高压输电接续管三维有限元几何模型，通过对模型的单元类型确定、材料选择、边界条件与荷载设置、传感器部署位置等，完成高压输电接续管仿真分析。实验结果表明：在Ⅸ度罕遇北京波影响下，接续管内漏磁信号特征量可评判缺陷深度，实现接线管漏磁检测。通过对DL/T1192-2012标准输电线接续管上表面和下表面两端的漏磁信号峰值检测等，证明了本文方法对强震影响下高压输电接续管漏磁进行检测的有效性。

Abstract:

To maintain the safe operation of a power system during a strong earthquake and improve the efficiency and quality of high-voltage transmission (HVT), in this paper, we propose a magnetic leakage detection method for HVT splicing sleeve under the influence of a strong earthquake. The magnetic flux leakage signal is obtained using a magnetic sensor, and the characteristic quantities of the signal in the splicing sleeve are extracted by calculation. Based on these characteristics, detection of the magnetic flux leakage from the HVT splicing sleeve is realized. We performed a simulation analysis of the HVT splicing sleeve by constructing a three-dimensional finite element geometric model. The experimental simulation results show that under the influence of a Beijing wave with a 9-magnitude, the characteristic quantities of the magnetic flux leakage signal in the splicing sleeve can be used to determine the depth of the defect and detect magnetic flux leakage. By detecting the peak value of the magnetic flux leakage signal on both ends of the upper and lower surfaces of the splicing sleeve of the DL/T1192-2012 standard transmission line, we proved that the proposed method is effective for detecting magnetic flux leakages from the splicing sleeve of a HVT line under the influence of a strong earthquake.