【摘要】 利用线路换位后参数的对称性,提出了相模变换矩阵关系;分析了各类简单故障时电流模故障分量在故障点和保护安装处的特征.由线电流模故障分量特点,提出了利用电流模故障分量的选相元件的原理.同时分析了负序分流系数、正负序阻抗不相等时对判据的影响.通过ATP仿真,表明无论是金属性故障或经过渡电阻单相接地故障,在故障发生后该元件可快速动作,验证了该方案的可行性.更多还原

【Abstract】 Transformation matrix of phase model is proposed,using symmetry after line changing.Characteristics are analyzed of component module fault current in fault point and the protection installation area with types of simple fault.Principle is concluded via phase selection element including the influence of negative sequence coefficient and different positive sequence impedance.This scheme is proved feasible through ATP simulation in case of metal grounding and transitional resistance grounding fault.更多还原