中性点非直接接地系统故障选线原理的发展与展望

中性点非直接接地是配电网普遍的接地方式 ,迅速判定单相接地故障线路是配网保护的关键问题 ,国内外对此进行了广泛而深入的研究并取得了大量成果。通过参阅国内外相关文献 ,在简要回顾故障选线原理发展的基础上 ,重点就当前各种故障选线原理的新进展做出分类 ,并概略分析了它们各自的优缺点。并由此提出了发展故障选线原理的研究思路和所需面对的关键问题

Development and prospect of the single-phase grounding fault detection in unearthed or compensated neutral networks

Distribution systems are universally the unearthed or compensated neutral networks. Detecting the single phase grounding fault feeder quickly and reliably is an important issue in the distribution system protection. Through reviewing the relevant published documents, this paper makes a brief retrospect on the development of single phase grounding fault detection. The classification according to used signals and the summary of respective advantages and disadvantages are then taken on the current different principles of detection. In the end, some new development tendencies and several key problems of single phase grounding fault detection are motioned.