阵列涡流检测特高压输变电塔法兰的应用研究

Application of Array Eddy Current in Flange Testing for Power Transmission Towers

法兰表面及近表面检测的目前使用方法是渗透和磁粉,而这2种方法的检测效率低,检测结果误差较大,难以满足国家电网公司对特高压输电项目中钢管塔的法兰盘安全服役的要求。阵列涡流具有检测速度快,表面及近表面缺陷检测盲区小,灵敏度高等多种优点。本研究针对法兰盘颈根部位的结构特点,设计了R角柔性阵列涡流检测探头;从阵列涡流检测仪、检测参数设定、数据分析方法入手,结合试样检测、现场检测,开发了铁塔法兰盘的阵列涡流检测工艺方法。经试验和现场检测证明:阵列涡流检测设备和工艺可消除法兰自身结构不同而带来的信号偏差,减少了人为因素影响,并提高了检测效率和检测结果的可靠性,是一种快速、简单、有效的新型检测方法。

With the development of ultra-high-voltage power transmission project in China,higher demands have emerged for the safe use of flanges of steel tube tower in recent years.PT and MT are used for surface testing of flanges.But both methods are inefficiency and inaccurate.The array eddy current testing has advantages of fast testing speed,small blind zone for surface and subsurface defect inspection,as well as high sensitivity etc.The R-angled flexible array eddy current probe specially designed for the root of neck of flange can avoid signal tolerance caused by the flange shape variation.This technique can help to reduce the influence of human factor for the testing result,and greatly improve the testing efficiency and the reliability of testing results.