基于差动式选线方法的漏电保护装置的研究

发布时间：2018-10-20 07:22

【摘要】：中性点不接地系统单相接地故障选线问题一直没有很好的解决办法,至今很多学者提出了许多选线方法,可是根据这些选线方法制作出的选线装置对于系统污染较严重的煤矿电网精确率还不够,准确率还有待提高。针对煤矿电网存在的选线问题,详细分析了中性点不接地系统发生单相接地故障时的稳态故障特征,提出了差动式故障选线方法：对各支路进行人为中性点经阻抗线圈补偿,根据补偿装置对故障线路和非故障线路的零序电流产生的不同影响进行判断。然后根据差动式选线判据设计了以MSP430F169为核心控制器的漏电保护装置,最后验证了在阻性补偿、容性补偿和感性欠补偿方式下装置的性能,经过验证证明了差动式选线判据能够正确选出故障线路,保护装置性能良好。
[Abstract]:There has been no good solution to the problem of single-phase grounding fault line selection in neutral ungrounded system. So far, many scholars have put forward a lot of line selection methods. However, the accuracy rate of the line selection device made by these methods is not enough for the coal mine power grid with serious system pollution, and the accuracy still needs to be improved. In view of the problem of line selection in coal mine power network, the steady state fault characteristics of neutral ungrounded system are analyzed in detail, and the differential fault line selection method is put forward: the artificial neutral point is compensated by impedance coil for each branch circuit. According to the compensator, the different effects of zero sequence current on fault line and non fault line are judged. Then according to the differential line selection criterion, the leakage protection device with MSP430F169 as the core controller is designed. Finally, the performance of the device under resistance compensation, capacitive compensation and inductance undercompensation is verified. It is proved that the differential line selection criterion can select the fault line correctly, and the performance of the protective device is good.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TD611.5;TM862

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