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一、概述《煤矿安全规程》第405条规定;“……井下由采区变电所,移动变电站或配电点引出的馈电线上,应装设短路和过负荷保护装置,或至少应装短路保护装置。……”目前井下上述馈电线均采用DW系列自动馈电开关实现过流保护(只有极少数带电子式脱扣器的DWKB30型开关)。但由于DW80和DW81系列开关的过流保护和整定采用开关内电磁式过电流继电器来实现,多年来现场普遍反映该装置整定不便,也不准确,特别在开关的过流保护器使用一段时间后,由于弹簧疲劳,其整定值与实际动作
First, an overview of “coal mine safety regulations” Article 405; “... ... downhole by the mining area substation, mobile substation or distribution point leads feeder, should be installed short circuit and overload protection device, or at least should be installed Short-circuit protection device ...... ”At present, all the above feeder lines adopt DW series automatic feed switch to achieve over-current protection (only a few DWKB30 type switches with electronic release). However, due to DW80 and DW81 series switches over-current protection and tuning using electromagnetic switch within the over-current relay to achieve over the years the scene generally reflect the inconvenience of setting the device, is not accurate, especially in the use of the switch over-current protection for some time , Due to spring fatigue, its setting value and the actual action