硅橡胶复合绝缘子具有憎水性、强度高和重量轻等优势,被广泛应用于电力系统,然而,目前尚没有准确有效的方法来检测硅橡胶复合绝缘子的老化状态.许多学者对复合绝缘子伞裙的老化状态开展了相关研究,但目前尚未有对复合绝缘子芯棒护套老...硅橡胶复合绝缘子具有憎水性、强度高和重量轻等优势,被广泛应用于电力系统,然而,目前尚没有准确有效的方法来检测硅橡胶复合绝缘子的老化状态.许多学者对复合绝缘子伞裙的老化状态开展了相关研究,但目前尚未有对复合绝缘子芯棒护套老化状态的研究报道.针对这一问题,该文设计了一种能够测量弧形表面样品的核磁共振(NMR)传感器,并应用于芯棒护套老化状态的检测.首先,对产生主磁场(B_0)的磁体结构进行了设计及优化,使得主磁场的分布具有和芯棒护套一样的曲率.其次,设计并优化了一种可弯曲的螺线线圈作为射频线圈.最后,用该传感器测量了3种在220 k V输电线路上挂网运行了不同年限的复合绝缘子的芯棒护套.采用CPMG脉冲序列激励样品,并得到横向弛豫衰减曲线,然后对横向弛豫衰减曲线做拉普拉斯逆变换获得横向弛豫时间(T_2)谱.T_2谱显示,随着运行年限的增长,复合绝缘子芯棒护套的T_2会减小.因此,从T_2谱中提取的T_(2,long mean)可以作为一个衡量复合绝缘子芯棒护套老化状态的参数.展开更多
研究特高压GIS空心复合绝缘子运行特性,可为我国特高压工程同类产品的结构设计、产品制造和运行检修提供参考。本文通过对荆门特高压变电站HGIS组合电器出线套管用空心复合绝缘子进行连续3年监测,并对运行3年后更换的一只1 000 k V空心...研究特高压GIS空心复合绝缘子运行特性,可为我国特高压工程同类产品的结构设计、产品制造和运行检修提供参考。本文通过对荆门特高压变电站HGIS组合电器出线套管用空心复合绝缘子进行连续3年监测,并对运行3年后更换的一只1 000 k V空心复合绝缘子进行了拆解及试验研究,对比分析了特高压空心复合绝缘子在运行前后其绝缘结构、机械结构、密封结构的性能变化。结果表明,特高压空心复合绝缘子总体运行良好。运行绝缘子的机械性能、界面性能、密封性能、材料性能等各项技术指标仍满足现行标准要求。与初始设计相比,除伞套材料硬度外,其他性能指标未见明显变化。后续工程制造和使用时应重点优化硅橡胶材料配方,关注材料硬度变化。展开更多
In view of the high voltage, the strong magnetic field environment of the high-voltage switchgear, the system based on the optical wireless sensing technology, realizes the isolated contact temperature monitoring of t...In view of the high voltage, the strong magnetic field environment of the high-voltage switchgear, the system based on the optical wireless sensing technology, realizes the isolated contact temperature monitoring of the high-voltage switchgear. In this scheme, the good thermal conductivity and insulation ceramic materials were selected as the outer jacket material sensing probe, and the program had a good solution to the problem of high and low voltage isolation; The combination of the optical fiber composite insulators for wireless sensing, not only solves the problem of high voltage insulation, but also avoids the ＂creeping＂ phenomenon due to dust. The package of the structure and reasonable installation solves the cross sensitivity of strain. The application showed that the precision of temperature measurement of the system could reach ± 0.5 ℃ and could work in a variety of harsh environments. It could improve the reliability of the operation of the electrical equipment significantly and has considerable practical value for the whole power system.展开更多
文摘硅橡胶复合绝缘子具有憎水性、强度高和重量轻等优势,被广泛应用于电力系统,然而,目前尚没有准确有效的方法来检测硅橡胶复合绝缘子的老化状态.许多学者对复合绝缘子伞裙的老化状态开展了相关研究,但目前尚未有对复合绝缘子芯棒护套老化状态的研究报道.针对这一问题,该文设计了一种能够测量弧形表面样品的核磁共振(NMR)传感器,并应用于芯棒护套老化状态的检测.首先,对产生主磁场(B_0)的磁体结构进行了设计及优化,使得主磁场的分布具有和芯棒护套一样的曲率.其次,设计并优化了一种可弯曲的螺线线圈作为射频线圈.最后,用该传感器测量了3种在220 k V输电线路上挂网运行了不同年限的复合绝缘子的芯棒护套.采用CPMG脉冲序列激励样品,并得到横向弛豫衰减曲线,然后对横向弛豫衰减曲线做拉普拉斯逆变换获得横向弛豫时间(T_2)谱.T_2谱显示,随着运行年限的增长,复合绝缘子芯棒护套的T_2会减小.因此,从T_2谱中提取的T_(2,long mean)可以作为一个衡量复合绝缘子芯棒护套老化状态的参数.
文摘研究特高压GIS空心复合绝缘子运行特性,可为我国特高压工程同类产品的结构设计、产品制造和运行检修提供参考。本文通过对荆门特高压变电站HGIS组合电器出线套管用空心复合绝缘子进行连续3年监测,并对运行3年后更换的一只1 000 k V空心复合绝缘子进行了拆解及试验研究,对比分析了特高压空心复合绝缘子在运行前后其绝缘结构、机械结构、密封结构的性能变化。结果表明,特高压空心复合绝缘子总体运行良好。运行绝缘子的机械性能、界面性能、密封性能、材料性能等各项技术指标仍满足现行标准要求。与初始设计相比,除伞套材料硬度外,其他性能指标未见明显变化。后续工程制造和使用时应重点优化硅橡胶材料配方,关注材料硬度变化。
文摘In view of the high voltage, the strong magnetic field environment of the high-voltage switchgear, the system based on the optical wireless sensing technology, realizes the isolated contact temperature monitoring of the high-voltage switchgear. In this scheme, the good thermal conductivity and insulation ceramic materials were selected as the outer jacket material sensing probe, and the program had a good solution to the problem of high and low voltage isolation; The combination of the optical fiber composite insulators for wireless sensing, not only solves the problem of high voltage insulation, but also avoids the ＂creeping＂ phenomenon due to dust. The package of the structure and reasonable installation solves the cross sensitivity of strain. The application showed that the precision of temperature measurement of the system could reach ± 0.5 ℃ and could work in a variety of harsh environments. It could improve the reliability of the operation of the electrical equipment significantly and has considerable practical value for the whole power system.
