【摘要】 分析了矿井电快速瞬变脉冲群骚扰的产生机理和幅频特性,确定了其主瓣频率在100MHz以内,并结合巷道中电磁波的传输特性,计算出辐射骚扰的衰减率,认为辐射骚扰不是电快速瞬变脉冲群在矿井中的主要传播方式。利用传输线理论建立了矿用电缆的集中参数电路模型,得到电快速瞬变脉冲群传导骚扰的衰减特性,结果说明,电快速瞬变脉冲群骚扰能量主要是以传导方式传播的。在此基础上,探讨了矿用电子设备抑制电快速瞬变脉冲群骚扰的抗干扰措施,确定了井下电子设备的抗扰度试验等级为3级。更多还原

【Abstract】 The mechanism and frequency-spectra of electrical fast transient/burst(EFT/B) were analyzed,and the major lobe frequency was determined in the range of 100MHz.On the basis of the propagation characteristics of electromagnetic wave in mine,this paper calculated the attenuation rate of EFT/B radiation.It shows that the electromagnetic disturbance of radiation is not the main propagation mode of EFT/B in mine.Based on transmission line theory,a lump-element circuit model of mine cables was established,and the attenuation characteristic of the EFT/B conduction disturbance was gained.The result indicates that the electromagnetic disturbance of conduction is the main propagation mode of EFT/B in mine.The anti-jamming measure of EFT/B for the electrical equipments in mine was also discussed.At the same time,the immunity test grade of the electrical equipments in mine was confirmed as Rank 3.更多还原