矿井高压供电系统网络型单相接地故障选线技术的研究

发布时间：2018-04-06 07:31

本文选题：暂态脉冲　切入点：单相接地　出处：《中国矿业大学（北京）》2014年博士论文

【摘要】：小电流接地系统发生单相接地故障时，故障线路和非故障线路的零序电流在故障暂态过程存在明显的区别，基于该出发点本文建立了矿井高压供电系统单相接地等效模型，并研究线路零序电流的时域表达式，以深刻揭示线路零序电流间存在的区别与联系。文章分析并证明了线路零序电流存在暂态脉冲，依据此脉冲的幅值和极性可以区分故障线路，由此文章提出并阐述了基于暂态脉冲特征选线的直接实现法和突变量间接实现法。为完善故障初始相位偏小时暂态脉冲特征不明显的不足，分析并阐述了基于线路零序电流直流分量的选线实现方法。为真正实现矿井电网的单相接地故障选线，文章以实际参与的改造工程为实例介绍并阐述了基于网络的智能化矿井高压供电系统的组成与实现。文章最终提出了基于网络的多判据融合选线机制，为选线结果给出可信度评价。
[Abstract]:When a single-phase grounding fault occurs in a low-current grounding system, there are obvious differences between the zero-sequence current of the fault line and the non-fault line in the fault transient process. Based on this starting point, a single-phase earthing equivalent model of the mine high-voltage power supply system is established in this paper.The time-domain expression of the zero-sequence current is studied to reveal the difference and relation between the zero-sequence current of the line.This paper analyzes and proves that there are transient pulses in the zero-sequence current of the transmission line. According to the amplitude and polarity of the pulse, the fault lines can be distinguished. In this paper, the direct realization method and the indirect realization method based on the transient pulse feature selection are proposed and expounded.In order to improve the characteristic of transient pulse with small initial phase, the method of line selection based on DC component of zero-sequence current is analyzed and expounded.In order to truly realize the single-phase grounding fault line selection of mine power network, this paper introduces and expounds the composition and realization of intelligent mine high-voltage power supply system based on network, taking the actual transformation project as an example.Finally, a network based multi-criterion fusion line selection mechanism is proposed to evaluate the reliability of the line selection results.
【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM862

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