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Failures of Equipment Operating Under Normal Conditions: Arc-Flash Events can Happen during Normal Operation

机译:在正常情况下运行的设备故障:在正常操作期间可能会发生电弧闪存事件

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Informational Note No. 1 for the definition of arc-flash hazard in National Fire Protection Association (NFPA) Standard 70E-2015 states, "Under normal operating conditions, enclosed energized equipment that has been properly installed and maintained is not likely to pose an arc-flash hazard." Table 130.7(C)(15)(A)(a) of the standard instructs that arc-flash personal protective equipment (PPE) is not required for normal operation of a circuit breaker, switch, contactor, or starter if the equipment is properly installed, properly maintained, equipment doors and covers are closed and secured, and there is no evidence of impending failure. This article reviews three electrical equipment failures during substation circuit breaker operations where if personnel had followed the guidelines just described, they could have been seriously injured during these failures due to the arc-flash energy released at the time of the fault.
机译:信息说明1号用于定义国家防火协会(NFPA)标准70E-2015状态,“在正常运行条件下,已正确安装和维护的封闭式通电设备不太可能构成弧形-flash危险。“表130.7(c)(15)(a)(a)(a)指示断路器,开关,接触器或启动器的正常操作不需要电弧闪光个人防护设备(PPE),如果设备正确安装,正确维护,设备门和盖子关闭并确保,没有即将发生的障碍。本文介绍了在变电站断路器操作期间的三种电气设备故障,如果人员遵循刚刚描述的指导方针,他们可能会在这些故障期间受到严重伤害,因为在故障时发布的弧形闪光灯。

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