基于故障距离区间的混联线路单端行波测距

发布时间：2018-11-09 17:08

【摘要】：架空线电缆混联输电线路发生故障时,单端故障行波难以辨识,无法直接用以定位故障点。为提升单端量测距的实用性,提出一种基于故障距离区间的混联输电线路单端行波故障测距方法。首先,利用基于单端工频量的逐段推演故障区段法,初步划定故障距离区间,并通过在线估算对端等值阻抗以确保所划定的区间的正确性;然后,分析划定的区间内的行波传播规律,构建故障点精确定位方法,针对区段连接点邻域内故障的特殊场景,提出连接点故障识别判据和故障区段判据;最后,通过剔除待辨识波头所在区间内的干扰波确保算法精度和可靠性。仿真结果表明,该方法测距精度高,不存在区段连接点邻域测距死区,通用于多段混联输电线路,具备较高的实用价值。
[Abstract]:It is difficult to identify the traveling wave of the single terminal fault and can not be used directly to locate the fault point when the fault of the hybrid transmission line of overhead line or cable occurs. In order to improve the practicability of single terminal location, a single terminal traveling wave fault location method for hybrid transmission lines based on fault distance interval is proposed. Firstly, the fault distance interval is preliminarily determined by using the one-terminal power frequency method, and the equivalent impedance of the terminal is estimated online to ensure the correctness of the defined interval. Then, the traveling wave propagation law in the defined interval is analyzed, and the accurate location method of fault point is constructed, and the fault identification criterion and fault section criterion are put forward for the special scene of fault in the neighborhood of the joint point of the section. Finally, the accuracy and reliability of the algorithm are ensured by eliminating the interference waves in the interval of the wave head to be identified. The simulation results show that the method has high ranging accuracy and no dead zone in the vicinity of the section connecting points. It is commonly used in multi-segment hybrid transmission lines and has high practical value.
【作者单位】：电网智能化调度与控制教育部重点实验室(山东大学);
【基金】：国家自然科学基金项目(51177091)~~
【分类号】：TM75

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