矿用电缆护套对电快速瞬变脉冲群感应耦合的影响  

Effects of Mine Cable Jacket on the Induction Coupling of Electrical Fast Transient Burst

作　　者：冯德旺[1,2] 刘文虎[3] 

机构地区：[1]福建农林大学计算机与信息学院,福州350002 [2]中国矿业大学(北京)机电与信息工程学院,北京100083 [3]德州学院数学系,山东德州253023

出　　处：《太原理工大学学报》2012年第2期139-143,157,共6页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(50674093);福建省教育厅资助项目(JA11098)

摘　　要：易燃、易爆危险环境中不能打开电气设备隔爆外壳进行直接测量,这就造成无法定量分析矿用电缆中电快速瞬变脉冲群的感应耦合骚扰限值。以双指数瞬态脉冲作为骚扰源,运用电路和电磁场理论建立矿用电缆的感应耦合模型,并进行数值分析。结果表明:矿用电缆金属护套可靠接地能够有效抑制电快速瞬变脉冲群的感应耦合骚扰,被金属护套完全包裹的电缆可以消除容性耦合骚扰。金属护套层越厚,感应耦合电压越小;电缆越长,感应耦合电压越高。缆皮终端接地电阻越小,感性耦合电压越低,屏蔽效果越好。电缆金属护套未接地时,会产生更高的感应耦合电压。巷道中与骚扰源同侧的电缆感应耦合电压比异侧的电缆感应耦合电压高。Under the inflammable or explosive environment, the direct measurement methods by opening up the explosion-proof shell of electrical installations are not adoptable in mine. So, it＇s impossible to have a quantitative analysis on the limit of the induction coupling disturbance of electrical fast transient burst （EFT/B） in such dangerous environment. Transient induction dis- turbance coupling model, which was EFT/B as it＇s excitation source, was established based on circuit and electromagnetic theory. Furthermore, numerical analysis was performed. The results indicate that grounding cable metal jacket possessed the rejection capability for the induction coupling of EFT/B. Thicker cable metal jacket gave small voltage of induction coupling small grounding resistance led to better screen effect. The capacitance coupling disturbance was avoided as the cable was enclosed by metal jacket completely, and inductance coupling voltage increased with the increase of cable length. The induction coupling voltage of un-grounding cable metal jacket was higher. Moreover, the cable coupling voltage on the same side of disturbance source was higher than that on the opposite side in tunnel.

关 键 词：电快速瞬变脉冲群 感应耦合 电缆护套 数值分析 

分 类 号：TD611[矿业工程—矿山机电]