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在隔爆外壳内部,电弧击穿某些塑料绝缘材料后所形成的电气故障,能使一般隔爆电器的隔爆保护性能失效。几十年来在有爆炸性气体或蒸汽存在的场合,利用隔爆外壳使电力开关安全运行。这种隔爆外壳不是完全密闭的,爆炸性气体或蒸汽通过法兰盘的间隙可以扩散进去,万一这些气体被点燃,那么燃烧的火焰必须传播
In the interior of the flameproof enclosure, electrical breakdown caused by arc breakdown after certain plastic insulation materials can make the flameproof protection performance of general flameproof electrical appliances fail. For decades in the presence of explosive gases or vapors, the use of flameproof enclosure to make the power switch safe operation. This flameproof enclosure is not completely enclosed, and explosive gases or vapors can diffuse through the gap in the flange and in the unlikely event that these gases are ignited, the burning flame must propagate