气体绝缘输电线路铝制外壳焊缝无损检测试验对比分析

通过对铝制壳体缺陷试样检测的试验和仿真分析，研究比较了相控阵检测（PA）、常规射线检测（RT）和常规超声检测（UT）3种检测方法对气体绝缘输电线路铝制外壳焊缝检测的有效性。试验结果表明，对于危害性比较大的面积型缺陷，超声检测及相控阵超声检测的检出率优于射线检测；相控阵检测更容易找到检出缺陷的最佳角度，具有更高的危害性缺陷检出率，能获得更多的缺陷特征信息。试验结果为苏通综合管廊工程气体绝缘输电线路（GIL）外壳无损检测工艺制定提供了依据。

Comparative Analysis on PA and UT Technologies in Defect Detection Rete of Gas-insulated Enclosed Electrical Equipment Enclosure

Based on the test and simulation analysis of aluminum shell defect specimens, three methods of phased array inspection (PA), conventional ray test (RT) and conventional ultrasonic testing (UT) for welding seam detection of aluminum shell of the gas-insulated transmission lines were studied and compared. The test results show that the detection rate of UT and PA is superior to that of RT for face-type defects with greater hazards.Phased array detection (PA) is easier to detect the best angle of defects, has a higher detection rate for hazardous defects. Moreover, PA can obtain more information of defect feature. The test results provide a basis for the non-destructive testing process of gas insulated transmission line (GIL) shell in Sutong pipeline corridor project.