辐射状接地体冲击接地阻抗特性的实验  

Experimental investigation of transient grounding resistance characteristics on spokewise grounding electrode

作　　者：陈加清[1,2] 周璧华[2] 赵斐[3] 郭飞[2] 黄小方[2] 

机构地区：[1]解放军理工大学气象学院,江苏南京211101 [2]解放军理工大学工程兵工程学院,江苏南京210007 [3]解放军理工大学指挥自动化学院,江苏南京210007

出　　处：《解放军理工大学学报（自然科学版）》2010年第2期142-146,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60671007)

摘　　要：为了研究辐射状接地体的冲击接地特性,用实验的方法得到了2种辐射状接地体的冲击接地阻抗TGR(transient grounding resistance)。实验所用接地体,其一,由8根长2m的钢筋组成米字形接地体;其二,由4根长4m的钢筋组成十字形接地体,材料均为10钢筋,埋深0.6m。实验时高压脉冲发射器经接地体入地点放电,由脉冲电流传感器和脉冲电压传感器测得的信号经光纤传输系统传送至多路数字示波器,根据同步记录、存储的波形,计算得出了冲击接地阻抗波形。实验结果表明,在实验冲击电流下,米字形接地体的冲击接地阻抗呈现明显的容性特征,而十字形接地体的冲击接地阻抗容性特征不明显;冲击接地阻抗时域波形的稳定值与工频接地电阻的理论值非常接近。To investigate the transient grounding characteristics of the spokewise grounding electrode, the transient grounding resistances of the two kinds of spokewise grounding electrode were obtained from the field measurements. Each kind of grounding electrode was made of reinforcing steel bars with the diameters of 10 mm and the total length of 16 m was buried horizontally at the depth of 0. 6m from the ground surface. The star-shape grounding electrode was composed of 8 reinforcing steel bars. The cross-shape one was composed of 4 reinforcing steel bars. A pulse discharge from a high-voltage pulse generator was applied at the center of the grounding electrode to observe the transient voltage and the current on it. The measured waveshapes were synchronously recorded, and the transient grounding resistance was calculated and analyzed. The experiment results suggest the obvious capacitive characteristics on the star-shape grounding electrode, and the accordance between the stable value of TGR and the theoretic value of the power frequency grounding resistance.

关 键 词：冲击接地阻抗 辐射状接地体 光纤测量 数字滤波 

分 类 号：O441.3[理学—电磁学]