GIS的X射线数字成像检测

X-ray Direct Radiography in GIS Testing

摘要: 介绍了利用X射线数字直接成像技术(Direct Radiography)检测变电站运行的气体绝缘开关(GIS)中的典型缺陷。云南省某变电站110 kV GIS母线在运行时存在严重异响，经DR检测后，发现问题母线段B相上方垂直导电杆安装偏斜以及水平导电杆下方支柱绝缘子断裂。经过对比，证实X射线检测结果与实物缺陷完全一致。实践表明，X射线数字成像技术能够直观、定性地给出变电站在用GIS内部结构的裂纹、装配类缺陷，为确定检修方案提供了最有利的证据，缩短了检修周期。

Abstract: In this paper, the typical defects that were found in testing of operating gas insulated switch(GIS) using X-ray real-time direct radiography(DR) were introduced. The bus line of 110 kV GIS, equipped in certain transformer substation of Yunnan, was found unusual sound while operating. Via DR testing, we found the broken insulator supporting the horizontal post of B-phase and the oblique post vertical to the horizontal one. Contrasting between the obtained X-ray photographs and the real inner parts of GIS showed that the results obtained using DR were completely in accordance with the real one. These conclude that DR testing can give intuitive and qualitative results to the inner flaws of GIS, such as the cracks and assembling defects. These results provide the most effective evidences for making repair schedule and therefore save repairing period.