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井下采矿作业用电由采区变电所引出的380V网络供给,采区变电所装设变压器(通常为两台400kVA容量的变压器)和下列低压配电装置:1、0.4kV三相网络远距离控制盘;2、AΦB型自动开关的分段组合远距离控制盘,母线分段上通常接有四个引出线。自动开关分段组合,按采区变电所分段线路数量设置。目前系列生产的检漏继电器动作无选择性,故一台用电设备的故障或绝缘水平下降,将断开所有采区变电所供电的设备。因为采区变电所经常无人值班,设备的断开将引起采区长时间停电。为了克服这个缺点,需要有选择地断
Downhole mining operations are powered by a 380V network from a substation in the mining area. Transformers in the mining area substations (usually two 400kVA transformers) and the following low-voltage distribution devices: 1,0.4kV three-phase network Distance control panel; 2, AΦB-type automatic switch section combination remote control panel, the bus segment is usually connected to four leads. Automatic switch segment combination, according to the district substation number of segments set. The current series of leak detection relay action without selectivity, so the failure of a power equipment or insulation level down, will disconnect all the mining area substation power supply equipment. Because mining area substations are often unattended, the equipment will cause a cut-off mining area for a long time blackouts. In order to overcome this shortcoming, there is a need to selectively break