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煤矿井下所用微地震监测仪,在运行时可能会产生火花、电弧或危险高温,根据煤矿安全生产的要求,如果将用于地面监测的仪器应用到井下,不符合煤矿安全要求,要对它进行防爆。要为微地震监测仪设计防爆外壳,设计中,电缆引入装置是非常关键的一个环节。要考虑本质安全电路的电气间隙和爬电距离,再结合标准GB3836.4-2000爆炸性气体环境用电气设备第4部分:本质安全电路“i”中的规定。
Micro seismic monitors used in coal mines may generate sparks, arcs or dangerous high temperatures during operation. According to requirements of mine safety production, if the instruments used for ground monitoring are applied downhole and do not meet the requirements of coal mine safety, they should be carried out Explosion-proof. To design an explosion-proof enclosure for a microseismic monitor, a cable entry device is a key element in the design. To consider the intrinsically safe circuit clearances and creepage distances, combined with the standard GB3836.4-2000 Electrical apparatus for explosive gas atmospheres Part 4: Intrinsically safe circuit “i ” in the provisions.