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In order to solve the ground fault in ungrounded systems, this paper applies the differential protection method based on the “external signal generating device and feeder terminal unit” to the external signal ground fault selection technology, proposes differential protection method of ground fault detection criteria and action principles, and achieves segment selection on the basis of ground fault phase selection. Finally, the effectiveness of the method is verified through a case study, and the results show that the proposed fault discrimination method has high accuracy and can minimize the range of ground fault power outages, which can also improve fault handling efficiency and power supply reliability.
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为处理不接地系统的接地故障,本文基于“外施信号发生装置+馈线终端”将级差保护方法应用于外施信号接地选线中,提出级差型接地故障检测判据及动作原则,在接地故障选相的基础上实现了选段。最后,通过案例验证了方法的有效性。验证结果表明,该故障判别方法准确率高,可以最大程度地缩小接地故障导致的停电范围、提高故障处置效率和供电可靠性。
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2
2021年第2期
张光儒(1989—),男,甘肃省武威市人,硕士,主要从事主动配电网和新能源调度、运行控制技术研究工作。
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53(4): 130-131., articleTitle=基于FTU的配电网馈线故障区段定位系统分析, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1194259189284438316, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194204269357265622, xref=1, ext=[AuthorCompanyExt(id=1194259189292826925, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1194204269357265622, companyId=1194259189284438316, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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| 方法 | 动作开关 数量 | 停电范围 | 故障定位 准确率/% |
| 方式Ⅰ | 3 | 全线 | 96[15] |
| 方式Ⅱ | 1 | 新庙分支开关下游 | 99 |
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不同方法的性能比较与实验结果
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| 方法 | 动作开关 数量 | 停电范围 | 故障定位 准确率/% |
| 方式Ⅰ | 3 | 全线 | 96[15] |
| 方式Ⅱ | 1 | 新庙分支开关下游 | 99 |
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