Based on the detailed analysis of basic principle, the traditional three-phase short-circuit criterion of phase selection element based on sudden-change of phase current differential is improved.
在详细分析相电流差突变量选相基本原理的基础上，对传统相电流差突变量选相元件三相短路故障判据进行了改进。
Base on of the basic theory of stability analyses, Finite element model building and the elements selection are analysed.
基于拱桥稳定性分析的基础理论，给出拱桥有限元建模的单元选取及建模方法。
Base on of the basic theory of stability analyses, Finite element model building and the elements selection are analysed.
基于拱桥稳定性分析的基础理论，给出拱桥有限元建模的单元选取及建模方法。
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