| 摘要 |
PURPOSE:To have a voltage non-linear resistant body suitable for a lightning arrester provided with a gap by allowing a ZnO inter-granular phase to contain 0.01-15.0wt.% TiO2 in rutile crystalline structure. CONSTITUTION:0.01-15.0wt.% TiO2 in rutile crystalline structure is included in a ZnO inter-granular phase, and thereby the specific dielectric factor of a resistant body as object of the present invention can be increased to over 700. Thereby the specific dielectric factor of the whole current restricting element can be increased, and the flash shortcircuit voltage of a series gap be sunk, so that there is no more need to annex any insulator or replace arc horn even in case a lightning arrester provided with a gap is mounted on an existing steel tower. Effectiveness is ensured by specifying the rutile crystal having high temp. stability and high dielectric factor among the TiO2 phase transformations, and also giving the content a value between 0.01-15.0wt.% or favorably between 0.01-10wt.%. The grain size of rutile crystal shall preferably be 1.5-3mum. Quantitative determination of rutile crystals can be made through measurement by the power type X-ray diffraction method. |
