基于D-S证据理论的小电流接地故障连续选线方法

小电流接地故障发生后,系统可以带故障运行一段时间。针对这一特点,提出了一种充分利用故障信息的连续选线方法。利用D-S证据理论实现故障持续过程中多信息的融合,将多信息连续选线问题转化为证据推理问题,提高了选线性能,为定量描述各线路可能发生故障的程度,在应用中提出了单次故障度和连续故障度的概念。在充分利用故障信息的同时,采用迭代算法降低了存储容量要求。通过现场实际故障验证了该方法的正确性和实用性。

Study on continuous line selection for small current earth fault based on D-S evidence theory

In accordance with the characteristics of small current earth fault, an approach of continuous line selection is proposed. The fusion of multi- information is realized and transformed into evidence-reasoning problem. Concepts of single fault degree and continuous fault degree are proposed to depict the faulty possibility of each line. This method reduces the storage amount requirement with iterative calculation, and is verified to be correct by actual field faults.