T型高压输电线路故障测距

现有的T型线路故障测距算法都是先判断故障支路，然后将3端线路等效成双端线路进行测距。该文指出了在T节点附近短路，尤其是经高阻短路时，现有的T型线路故障测距方法由于无法正确判别故障支路而存在一个测距死区。考虑上述问题，该文利用过渡阻抗的纯电阻性质，提出了一种新的T型线路故障测距方法。该方法打破了传统的先判断故障支路再故障定位的模式，无需事先判别故障支路即可测距。该方法无测距死区，测距精度不受过渡电阻和故障类型影响，较好的克服了传统方法在T节点附近有测距死区的不足。EMTP仿真结果表明该方法正确，测距精度高。

Fault Location for HV Three-terminal Transmission Lines

All of the fault location methods currently used for teed lines need to identify the fault section first, then convert the three-terminal line to a two-terminal line to locate the fault. The fact that while the fault occurs near the teed node, especially through a large resistance, the fault location methods currently used can't identify the fault section correctly, thus fail to locate the fault was pointed out. Considering the above, a new fault location method for teed lines, which makes use of the pure resistive characteristic of fault impedance is presented. This method breaks the mold of traditional methods that it must identify the fault section before locating the fault. The proposed method can locate the fault without identifying the fault section first. And this method doesn't have dead zone of fault location, it can accurately locate the fault occurring near the teed node. The accuracy is independent of fault resistance and fault type. Above all, this method perfectly solves the disadvantage of currently used methods that there is a dead zone of fault location near the teed node. Results of EMTP based simulation indicate that this method is correct and accurate.