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RL C线路的Π型等值电路是电力系统计算通用的等值电路 ,若用于故障计算 ,其端口电压电流即为母线和故障点的电压电流。用以进行远距离高压输电线路的故障测距 ,其算法与长线方程测距算法相近。介绍了运用 Π型等值电路进行测距的算法。事实上 ,该算法可用于任一模型的线路。当用于 RLC线路时 ,其故障距离的估算公式是实系数四次方程 ,须恰当地选取初值进行迭代计算 ,才可获得确切的解。文中以长线方程作故障模拟 ,用 RL C线路模型进行故障测距 ,并附以算例 ,结果表明误差较大 ,工程上无法接受因此该方法只能用于 2 2 0 k V线路和用作不同类型电路模型测距性能比较的研究。
Π-type equivalent circuit of RL C line is a common equivalent circuit of power system calculation. If used in fault calculation, its port voltage and current are the voltage and current of busbar and fault point. Used for long distance high voltage transmission line fault location, the algorithm and long-range equation ranging algorithm similar. The algorithm of using Π-type equivalent circuit to measure distance is introduced. In fact, the algorithm can be used on any model line. When used in RLC line, the fault distance is estimated formula is real coefficient four times equation, the initial value must be properly selected for iterative calculation, in order to obtain the exact solution. The long-haul equation is used to simulate the fault and the RL C line model is used to locate the fault. The example is attached and the result shows that the error is large and can not be accepted in engineering. Therefore, this method can only be used for 220 kV lines and is used as Study on Distance Performance Comparison of Different Types of Circuit Models.