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。
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