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| 摘要: |
| 通过一起低压配电设备事故的分析表明,低压开关柜的插接头,在大电流下易发生接触面氧化和过热变形并引发事故.而变压器继电保护为满足高压侧短路时与熔断器-接触器(F-C)开关的时限配合关系,难以兼顾低压侧短路时的快速性,使得间断性的故障不能切除.又由于F-C开关熔断器配置不合理,导致低压设备故障时完全失去保护,造成事故的扩大.在继电保护配置、熔断器选择以及检修维护方面提出了一些防范措施. |
| 关键词: 低压开关 短路 事故扩大 继电保护 F-C熔断器 措施 |
| DOI： |
| 分类号:TM774 |
| 基金项目: |
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| Analysis of a low-voltage electrical accident |
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ZHENG Bing-wen
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| Abstract: |
| The deep analysis of a LV(Low Voltage) distribution equipment accident indicates that,the surface oxidation and overheat deformation of LV switch board connectors may happen under big current,which causes accident.To satisfy the time coordination relation with F-C(Fuse-Contactor) switch during high voltage side short-circuits,transformer protection may not be able at the same time to satisfy the rapidity during low voltage side short-circuits,which causes the temporal fault remained.Furthermore,the use of improper F-C switch fuse may lead to total protection loss,which causes accident spreading.Some countermeasures are proposed in protection configuration,fuse selection and maintenance. |
| Key words: low-voltage switch short-circuit fault spread relay protection F-C fuse countermeasure |
