配电网单相接地故障选线方案

配电网单相接地故障选线问题由来已久,以往的研究主要集中在相对理想情况下的基于单一特征量的选线方法,而缺乏对单相接地故障的准确确认和对故障信息的充分、有效利用,并且对选线判据在复杂条件下的自适应性和容错性的分析不够深入,这就导致了在实际的生产运行中难以正确实现既定的选线方法,最终容易造成误选。该文首先区分可能造成混淆的故障类型;然后提出了同时运用电压、电流分量的自适应性强、容错性能好的内积选线判据;最后,提出考虑极端情况下的补救方法,从而实现了选线方法在理论上的完备性。大量的EMTP仿真分析结果都表明,该方法能够准确地判定单相接地故障、可靠地选出接地线路,具有很强的鲁棒性。

Project of fault line detection for single-phase-to-earth in distribution system

As an unflagging research project, fault line detection for single-phase-to-earth in distribution system has been mainly concentrated on development of different methods based on single eigenvalue in perfect cases, but rarely on the correct affirmance for the fault, the sufficient and effective use for the fault information, and deeper field. Analysis of the character of self-adaptiveness and mistake enduring for the criterion under complex condition is needed. The mistake for fault line selection can not be entirely avoided. In this paper, firstly, several types of faults is distinguished. Secondly, the self-adaptive criterion based on voltage and current is brought out. Last, with the method for remediation under extreme condition brought forward, the maturity in fault line selection theory is realized. EMTP simulations show that the proposed method can check out the fault line in distribution system exactly and reliably, and is robust.