皮带巷电机暂态过程对电磁环境的影响

Effect of Motor Transient Process on Electromagnetic Environment in Belt Conveyor Tunnel

利用ATP软件仿真皮带电机暂态过程,并运用传输线模型分析瞬态脉冲沿巷道和电缆的衰减特性.结果表明,理论上电机起动、制动及负载突变时产生的瞬态脉冲电压峰值最大为额定电压的6倍,电流峰值最高可达额定电流的11倍;瞬态辐射发射对皮带巷电磁环境的影响较小,而瞬态脉冲沿长电缆传播会产生较大衰减.确定煤矿井下现场测量工具及测点布置方法,分析比较实测数据与理论值,结果说明皮带电机起动和制动过程产生的瞬态辐射骚扰可以忽略,瞬态传导骚扰较大,但脉冲峰值最大不会超过额定值的4倍.提出的井下现场测量方法、获得的实测数据和理论值为矿井电磁兼容性研究提供了参考依据.

Analysis of electromagnetic characteristic for three-phase induction motor transient process is fundamental to protection of mine electronic products against electromagnetic interference. The transient process of belt motor was analyzed by ATP software. Then, the propagation characteristic of transient pulse in tunnel and cable was researched by transmission line theory. The results indicate that motor starting, braking and load sudden change can all produce transient pulse, which peak voltage is six times rated voltage, and peak current was closed to eleven times rated current. Its radiated emission plays only a small part in the real effect on the electromagnetic environment in belt conveyor tunnel, and long cable has nature attenuation function for transient pulse propagation in it. The instrument of measurement and test point location in coal mine were confirmed. Comparing the measured data with the theoretical value, the results show that the transient radiation disturbance in belt motor starting and braking process can be ignored. Transient conduction disturbance voltage is larger, but pulse peak does not exceed the rated value of four times. So, the research results present useful reference for the electromagnetic compatibility studies in mine.