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矿井高压供电系统网络型单相接地故障选线技术的研究
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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。
The zero-sequence current between fault line and normal line is quite different especially in thetransient process after single-phase earth fault occurred, according to which the equivalent circuit ofcoal mine HV grid is built to get the expressions of zero-sequence current and find the differencebetween fault line and normal line. It is analyzed and proved by theoretical derivation in the paperthat there is on transient pulse in the zero-sequence current, and can be used to select the fault line bythe amplitude and polarity of the pulse. Two methods according to the transient pulse characteristicis introduced to select fault line, which are called direct selection method and break-variableselection method respectively. Furthermore, the fault line selection method based on the DCcomponent of zero-sequence current is introduced to solve the problem that the transient pulse willnot be obvious when fault angle is small. In order to select the fault line correctly, the compositionand implementation of coal mine high-voltage (HV) grid base on network is introduced, taking onepractical renovation project as example. Finally the combination mechanism of line selectionmethods based on network is introduced in the paper, to judge the reliability and correctness of theselection result.
引文
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