Failures Of Equipment Operating Under Normal Operating Conditions

P. Sullivan
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Abstract

Informational Note No. 1 for the definition of arc flash hazard in National Fire Protection Association 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 states that arc flash 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 paper will review three electrical equipment failures during substation circuit breaker operations where if personnel had followed the guidelines described above, they could have been seriously injured during these failures due to the arc flash energy released at the time of the fault.
设备在正常运行条件下的故障
美国国家消防协会标准70E-2015中关于电弧闪光危险定义的信息说明1指出:“在正常操作条件下,正确安装和维护的封闭式通电设备不太可能造成电弧闪光危险。”表130.7(C)(15)(A)(A)规定,如果设备安装正确,维护得当,设备门和盖板关闭并固定,并且没有即将发生故障的迹象,则断路器、开关、接触器或起动器的正常操作不需要防弧防护用品。本文将回顾在变电站断路器操作过程中发生的三起电气设备故障,如果人员遵循上述指导方针,则由于故障时释放的电弧闪光能量,他们可能会在这些故障中受到严重伤害。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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