【作者】 尹璐旻；

【导师】 杨以涵；

【作者基本信息】 华北电力大学（北京） ， 电力系统及其自动化， 2005， 硕士

【摘要】 小电流接地系统单相接地故障选线问题是一个研究多年的老问题,但现场运行的结果表明,装置的选线效果不是十分理想,其可靠性不稳定。本文将粗糙集理论应用于小电流接地系统故障选线,从大量现场录波数据中进行数据挖掘、知识发现,确定现有各种算法的有效域,利用它们的互补性,扩大正确选线的故障范围,提高选线结果的可靠性;另一方面利用 Duffing 振子相变具有很高的测量灵敏度和好的抗噪性能,将它应用于小电流接地系统,提出一种新型选线方法,抑制干扰的影响,并与现有算法的有效域相结合进一步提高选线结果的准确性。更多还原

【Abstract】 Fault selection for the non-effective earthing system is a long-standing problem in theoperation of ineffectively grounded distribution systems. But the spot records show that theeffect is disappointing. The paper particularizes that one is confirming validity of all kinds offault selection methods through data mining on large numbers of local data based on roughset theory, which can expand the scope of correct fault selection and improve the selectionresult reliability; the other is a new fault selection method based on Duffing equation that ishigh measurable delicacyand good anti-jamming. Both of them are combined to improve theaccuracyof fault selection.更多还原