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首页> 外文期刊>Electrical Insulation Magazine, IEEE >Effect of limiting airflow in mitigating combustion-driven manhole events
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Effect of limiting airflow in mitigating combustion-driven manhole events

机译：限制气流对减轻燃烧驱动的人孔事件的影响

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"Manhole event" refers to a range of phenomena, such as smokers, fires, and explosions, which occur in underground electrical infrastructure, primarily in large cities. Whereas some manhole events are caused by failure of primary distribution cable, most are caused by failure of unshielded secondary cable in network systems [1]-[3]. Based on analysis and knowledge of field conditions, manhole events can be divided into at least two classes, those in which exothermic chemical reactions dominate and those in which electrical energy dominates [4]. In an electrically driven event, the arcing energy is so great that it causes rapid vaporization of the conductor and nearby polymers, which sweeps the oxygen from the cable duct so the event evolves through electrical fault energy induced pyrolysis. In the more common combustion-driven events, the electric fault energy ignites the cable insulation near the fault, resulting in self-sustained combustion as a result of air flowing down the duct. This establishes a combustion zone, which consumes oxygen and liberates heat, causing anaerobic decomposition of polymeric materials downstream of the combustion zone, which results in generation of combustible gases. In combustion-driven manhole events, airflow through the duct plays an important role in the combustion propagation in the duct and the evolution of the manhole event. The discussion below is restricted to combustion-driven manhole events which constitute a large majority.
机译：“人孔事件”是指在地下电气基础设施中（主要在大城市中）发生的一系列现象，例如吸烟者，火灾和爆炸。某些人孔事件是由主配电电缆故障引起的，而大多数是由网络系统中未屏蔽的副电缆故障引起的[1]-[3]。根据对现场条件的分析和了解，沙井事件至少可以分为两类，其中放热化学反应占主导地位和电能占主导地位[4]。在电驱动事件中，电弧放电能量非常大，以至于导致导体和附近的聚合物快速汽化，从而将氧气从电缆管道中清除掉，因此该事件通过电气故障能量引起的热解而发展。在更常见的燃烧驱动事件中，电气故障能量会点燃故障附近的电缆绝缘层，由于空气顺着管道向下流动，导致燃烧自持。这建立了燃烧区，该燃烧区消耗氧气并释放热量，从而导致燃烧区下游的聚合材料发生厌氧分解，从而导致产生可燃气体。在燃烧驱动的人孔事件中，通过管道的气流在管道中的燃烧传播和人孔事件的演变中起着重要作用。以下讨论仅限于燃烧驱动的人孔事件，这些事件占绝大多数。

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