输电线两端均带并联电抗器的纵联差动保护

Research on Current Differential Protection at Both Ends of Transmission Line with Shunt Reactor Circuit

针对特高压输电线路分布电容电流较大,传统的电容电流补偿方法没有好效果,的问题,提出了在两端均接有并联电抗器的长距离输电线上应用贝瑞隆模型实现分相电流差动保护新原理,该原理实现方法是应用贝瑞隆模型计算参考点两侧的电流并进行差动计算,与基于电容电流补偿方法的传统分相电流差动保护相比,该原理不受分布电容电流的影响,具有更高的可靠性和灵敏性,用Matlab仿真证明了该原理正确性和用于特高压线路的快速性。

When it is applied on UHV transmission lines, traditional current differential protection will be seriously affected by distributed capacitive current of transmission line .The traditional methods of capacitive current compensation is not still effective enough. So a novel principle of segregated current phase differential protection at both ends of transmission line with shunt reactor circuit based on the Bergeron model is proposed. The principle is to calculate based on Bergeron model and compare the currents of two sides of selected reference point on the protected transmission line. It will not be affected by distributed capacitive current and is more sensitive and reliable than traditional segregated current phase differential protection. Simulation results by MATLAB confirm that the principle is correct and has best rapid when used on UHV transmission lines.