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矿用电动机的使用特点是用漏电保护装置控制定子绕组绝缘的有效电阻。当电阻降低到临界值R_k和漏电增加时,该装置即断开电动机,就是说使电动机停车。根据ГОСТ22929—78,在换算为电动机全部三相的电阻R_k(当相对外壳同时测量三相绝缘电阻时)等于1.1;3.3;10;20千欧,相应电压分别为127,220,380,660,1140伏。所以与一般工业用防爆电动机不同,矿用电动机定子绕组无故障的工作概率按下式计算 P_o(t)=H_o(t)P(R_k),(1)式中H_o(t)—根据OCT16.0.689.038—74计算的定子绕组无绝缘物击穿概率;
Mine motor is characterized by the use of leakage protection device to control the stator winding insulation effective resistance. When the resistance drops below the threshold value R_k and leakage increases, the device disconnects the motor, which means that the motor is stopped. According to ГОСТ22929-78, the resistance R_k converted to all three phases of the electric motor (when measuring the three-phase insulation resistance with respect to the housing at the same time) is equal to 1.1; 3.3; 10; 20 kilohms, corresponding to 127,220,380,660,1140 volts, respectively. Therefore, with the general industrial explosion-proof motor, mine motor stator winding fault-free work probability calculated as follows P_o (t) = H_o (t) P (R_k), (1) where H_o (t) - according to OCT16. 0.689.038-74 Calculated stator winding uninsulated breakdown probability;