The figure simulation of power system is a complex subject of computer science and computational mathematics and control theory and power system application technology. Its essential is that it study work characteristic of system in a definite-time by mathematical model.

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Then several different protection criterions existing in being are analyzed, including quick break protection, definite-time protection, admittance change protection, admittance slope-change protection, and double-side inter-tripping.

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inversetime definite-time relay：定時限反時限繼電器

inversely-proportional relationship ==> 反比例關系 | inversetime definite-time relay ==> 定時限反時限繼電器 | inversion axis ==> 反演軸,旋轉倒反軸