服务入口断开,接近错过

J. Pettit, J. Chapa
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引用次数: 0

摘要

一个案例研究,详细说明了在制造工厂的服务入口断开处预防潜在的有害设备故障。2017年2月1日,通过红外(IR)窗口对外壳进行年度热分析,发现外壳表面温度为155°F, 3000安瓿,480伏未接地的三角洲主电气服务,内部断开组件的温度接近500°F。外壳内的主要电气服务断开无法操作。服务入口唯一的上游设备是建筑外的本地公用设备。在进行了现场风险评估后,该工厂立即关闭。当当地公用事业公司到达并切断大楼的电源时,更换部件被搜查了。随后对过热断开开关的调查发现,在四个月前对其进行的最后一次维护期间,它没有完全关闭。由于险些脱险,采取了一些维护计划和预防措施。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Service Entrance Disconnect Near Miss
A case study detailing the prevention of a potentially harmful equipment failure at the service entrance disconnect in a manufacturing plant. Annual thermal analysis being performed on the enclosure and through an infrared (IR) window on February 1, 2017 found a 3,000 amp, 480 volt ungrounded delta main electrical service with an enclosure surface temperature of 155° F and disconnect components inside with temperatures approaching 500 °F. The main electrical service disconnect in the enclosure was non-operable. The only upstream equipment from the service entrance is local utility equipment outside the building. The plant was immediately shut down after an on-the-spot risk assessment. Replacement parts were searched for while the local utility arrived to disconnect the power from the building. Subsequent investigation of the overheated disconnect switch found that it had not fully closed during the last maintenance performed on it four months earlier. As a result of the near miss, several maintenance program and prevention actions were taken.
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