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从防爆的观点看,井下供电系统中各种电气设备(电机、馈电开关、磁力起动器、手动开关……等)都具有坚固的外壳及各种保护,而电缆则几乎没有保护。电缆在井下敷设长度大、数量多(仅一个综采工作面就需要各种电缆5～6km),容易受到岩石、煤块的砸、挤压、剐…等损伤。因此在电气事故中电缆故障占40～50%。为了保护人身的安全和可靠的
From an explosion point of view, all kinds of electrical equipment (motors, feeders, magnetic starters, manual switches, etc.) in a downhole power supply system have a rugged case and various protections, while the cables are virtually unprotected. Cable laid in the underground length, the number of large (only a fully mechanized face you need a variety of cables 5 ~ 6km), vulnerable to rock, coal block smashing, extrusion, 剐 ... and other injuries. Therefore, in the electrical accident cable fault accounted for 40 ~ 50%. In order to protect the personal safety and reliability