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以一组ＲＬ电路模型为例，确定了序电压与输电线参数及有关物理量之间的关系。建立了三相短路故障定位的数学模型，并推导出一个适用于各种短路故障状态的通用测距表达式。应用数字距离继电器以及四阶低通滤波器和１２位Ａ／Ｄ转换器进行了短路故障定位的设计，对于２００ｋｍ长的输电线路，定位时间不超过００２ｓ，误差小于１％。
Taking a set of RL circuit model as an example, the relationship between sequence voltage and transmission line parameters and related physical quantities is determined. A mathematical model of three-phase short-circuit fault location is established and a universal ranging expression suitable for various short-circuit fault states is deduced. The application of digital distance relay and fourth-order low-pass filter and 12-bit A / D converter were designed for short-circuit fault location. For 200 km long transmission line, the positioning time should not exceed 0.02 seconds and the error should be less than 1%.