土壤介电频变特性试验研究及其对接地极冲击特性的影响.pdfVIP

第 35 卷 第 16 期 中 国 电 机 工 程 学 报 Vol.35 No.16 Aug. 20, 2015 2015 年 8 月 20 日 Proceedings of the CSEE ©2015 Chin.Soc.for Elec.Eng. 4247 DOI ：10.13334/j.0258-8013.pcsee.2015.16.029 文章编号：0258-8013 (2015) 16-4247-07 中图分类号：TM 853 土壤介电频变特性试验研究及其对接地极 冲击特性的影响 司马文霞，艾琳丰，袁涛，杨庆，朱彬，唐妍 (输配电装备及系统安全与新技术国家重点实验室(重庆大学) ，重庆市 沙坪坝区 400044) Experimental Study on the Frequency Characteristic of Soil Permittivity and the Influence on Impact Characteristics of Grounding Electrode SIMA Wenxia, AI Linfeng, YUAN Tao, YANG Qing, ZHU Bin, TANG Yan (State Key Laboratory of Power Transmission Equipment System Security and New Technology (Chongqing University), Shapingba District, Chongqing 400044, China) ABSTRACT: Grounding system is an important foundation to 低的土壤样品。然后进行了不同含水量、不同含石量的土壤 maintain safe and reliable operation of power system 介电谱的测量，对测得的数据进行函数拟合并代入有限元冲 equipment. In this paper, the frequency characteristics of soil 击特性模型中进行计算，分析了土壤电气参数的频变特性对 were studied by the frequency domain dielectric spectroscopy 冲击接地性能的影响。结果表明：冲击电流作用下，接地极 theory. To reduce the effects of electrode polarization, the soil 周围土壤的介电常数随频率在低频段近似符合幂函数规律， samples with high water content and low resistivity were 在高频段近似符合指数函数规律；在同一频率点，土壤的介 mixed. Then the soil dielectric spectrum with different water 电常数随土石比例和含水量的降低而减小；考虑土壤介电常 contents and amounts of rock was measured, and the data were 数频变特性后，冲击电流作用下接地极暂态电阻值与介电常 fitted to mathematical functions. Then the function was merged