配网不停电作业安全电弧伤害机理及防护措施

配网不停电作业存在着一定的技术难度和安全风险,如果操作不当或管理不规范,可能导致人员触电、电弧灼伤、高空坠落、设备损坏、线路短路等严重事故,危及人身安全和电网稳定运行。因此,有效地防护配网不停电作业电弧伤害,是保障电力系统安全可靠运行的重要任务。研究从配网不停电作业电弧伤害的机理、防护目标、防护区域、防护技术、防护效果和优化方向等方面,对配网不停电作业电弧防护进行了系统的分析和探讨。

电弧闪络的危害及其防护措施

电弧闪络危害具有较大的隐藏风险,其严重性和触电一样可能会致命。主要阐述了电弧闪络的危害,列举了国际法规中关于电弧闪络的相关规定以及所能采用的相关防范措施和减少电弧危害的缓解技术;简单介绍了国内电气设计人员如何运用ETAP工程软件对电弧闪络进行分析,为防护措施提供了有效的理论依据。

Analysis of low energy arc discharge characteristics based on dynamic V-A characteristics model

Low energy arc discharge characteristics was analyzed based on dynamic V-A characteristics model. It draws conclusions that discharge time relates to the source voltage and the product of inductance and stable current, discharge time will increase when the source voltage increases; current reduce rate is in inverse proportion to the value of inductance; arc resistance when the arc occurs is the ratio of minimum arcing voltage to stable current. It also gains the expressions of arc resistance and arc power, arc resistance and arc power both increase as the source voltage increases and decrease as the value of inductance increases. Conclusions above mentioned are helpful to design intrinsically safe circuits.