【摘要】 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。更多还原

【Abstract】 The Π equivalent circuits of transmission lines are commonly used in power system calculations. If this equivalent circuit is used in fault location of ordinary transmission line, the voltage and current at the terminal of the equivalent circuit is the very voltage and current at busbar and faulty position. If it is used in fault location of long distance high voltage transmission line, the algorithm is similar to the fault location for transmission line with distributed parameters. In this paper a fault location algorithm based on Π equivalent circuit is presented. In fact, the presented algorithm could be applied to different kinds of line models. When it is used for fault location of line with concentrated parameters, the formula estimating the faulty position is a forth order algebraic equation with real coefficients, the initial value for iteration should be selected appropriately to obtain proper solution. In the calculation example of this paper the fault simulation is performed by distributed parameter equation, the fault location is carried out by RLC line model. For 220kV transmission line the error of fault location results from this method is acceptable, but its algorithm is not so succinct as that based on the RL model. For 500kV long distance transmission line the fault location result is not so accurate as that based on the model with distributed parameters. Thus, this method could be only used in the fault location of 220kV transmission line and in the study on the comparison of fault location performances of different transmission line models.更多还原