中文摘要：

在高压直流输电线路分布参数模型的基础上,利用本端电气量计算保护范围末端补偿电压,根据本端电压测量值与保护范围末端补偿电压值构造保护判据。当输电线路区内发生金属性或低过渡电阻故障时,末端补偿电压值和保护安装处电压值极性相反,可以瞬时动作;当输电线路区内发生高过渡电阻故障时,根据耐过渡电阻值设定动作门槛,末端补偿电压值低于设定门槛,与相关保护配合可以延时动作。该保护原理与其他保护配合使用,具有完备的整定原则,故障后全过程都能投入运行。仿真验证了该原理的可行性。

英文摘要：

Based on the distributed parameter model of the HVDC transmission line,the compensating voltage at the end of the protection zone is calculated according to the electrical quantities measured at local convert station.A new monopole protection principle can then be constructed with the calculating voltage and the measuring voltage.When a metallic ground fault or low-impedance ground fault occurs in the line,as the compensating voltage at the end of the line has opposite polarity with measuring voltage at the local convert station,the protection criterion can act instantaneously.When a high-impedance ground fault occurs in the line,compensating voltage at the end of the line is lower than the preset threshold which is set according to the transition resistance.And the protection criterion can act in concert with interrelated protection principles.The coordination rule of this protection principle should cooperate with other interrelated protection principles.It is complete,and it can be put into operation during the whole process of fault.Simulation results have testified the feasibility of the principle.