基于故障分支快速辨识的T型高压输电线路故障定位新算法

发布时间：2018-08-19 17:44

【摘要】：传统T型高压线路故障测距方法在T节点附近发生故障时有测距死区,针对这一不足,根据两端测得故障点处正序电压相等推导出一种新的测距函数进行故障分支判断。在故障支路上,测距函数相位值单调且在首末两处的函数相位值相差大约180°;正常支路上,测距函数相位值也单调但在首末两处的函数相位值大约相等。基于测距函数的相位在首末两处的相位相差的大小这一特性作为故障分支判据,进而利用故障距离的解析表达式求解故障距离。该方法较好地克服了传统方法在T节点附近不能可靠识别故障支路的缺点,并且无需判别故障类型,只需代入相应的公式计算几个点即可得到故障距离,程序实现简单,计算速度快。本算法的测距精度理论上不受故障类型、过渡电阻、运行方式等影响。EMTP仿真结果验证了所述算法的正确性和高精度。
[Abstract]:The traditional fault location method of T type high voltage transmission line has a dead zone of fault location near T node. In view of this deficiency, a new fault location function is derived based on the equal positive sequence voltage between two measured fault points. In the fault branch, the phase value of the location function is monotone and the phase difference between the first and the last two functions is about 180 掳, while in the normal branch, the phase value of the location function is monotonous, but the function phase value at the first and last ends is about the same. Based on the property of the phase difference between the first and the last two positions of the location function as the criterion of fault branch, the analytic expression of fault distance is used to solve the fault distance. This method overcomes the shortcoming that the traditional method can not reliably identify the fault branch near the T node, and does not need to distinguish the fault type, and can get the fault distance by inserting the corresponding formula to calculate several points. The program is simple. The calculation speed is fast. The accuracy of the algorithm is not affected by fault type, transition resistance and operation mode in theory. The simulation results of EMTP verify the correctness and high accuracy of the proposed algorithm.
【作者单位】：华北电力大学电气与电子工程学院;国网冀北电力有限公司检修分公司;
【基金】：国家电网冀北电力公司科技项目“超高压线路多参数在线监测装置与监测系统的研发”的支持
【分类号】：TM75

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