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煤矿变电所小电流接地故障自动显示保护装置如附图所示,是由高灵敏度BLD-3型高电压检漏继电器、步进式电话选线器BX、25只
Mine substation small current ground fault automatic display protection device shown in the figure, is a high sensitivity BLD-3 type high-voltage leak detector relays, walkie-talkie phone line selection BX, 25