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早在1973年英国南约克郡的斯替脱莱煤矿在一种SM2型550V顺槽终端开关箱上加装了起动预警音响系统,并作了现场试验。七十年代后期改进为550/1100V系统,经卫生安全部门批准用于该矿装有却盘纳采煤机的安德逊双端输送机上,并在另一煤矿的150kW安德逊可调高滚筒采煤机上使用。一、线路的基本性能在开关箱内,将240V直流电压加在拖曳电缆的两相上,在主电机的一相上接入报警器电机回路,使箱内辅助接点闭合,预警系统开始动作(图1)。继电器MIA/B监视报警器电机的负载电流,只有在起动和运转的电流特性正常
As early as 1973, the Stilton mine in South Yorkshire, United Kingdom installed a start-up warning sound system on an SM2 550V switch terminal box and conducted a field test. The late 1970s was upgraded to a 550 / 1100V system approved by the Health and Safety Department for use on Anderson double-end conveyors equipped with a palletizing shearer in the mine and a 150kW Anderson height-adjustable Drum shearer used. First, the basic performance of the line In the switch box, the DC voltage of 240V will be added to the two phases of the tow cable, access to the alarm motor circuit in one phase of the main motor, the auxiliary contacts in the box closed, early warning system to start action figure 1). The relay MIA / B monitors the load current of the alarm motor, and only when the current characteristics of the start-up and running are normal