CHEN Sixue,ZOU Jie,DAI Liping,et al.Frequency Characteristics Study under Grounding Grid Faults[J].Journal of Chengdu University of Information Technology,2025,40(03):286-293.[doi:10.16836/j.cnki.jcuit.2025.03.005]
接地网故障下的频率特性研究
- Title:
- Frequency Characteristics Study under Grounding Grid Faults
- 文章编号:
- 2096-1618(2025)03-0286-08
- Keywords:
- grounding grid; frequency; ground impedance; nodal potential
- 分类号:
- TM862
- 文献标志码:
- A
- 摘要:
- 为解决当前接地网故障的诊断过程中,需要采取停工、断电以及人工挖掘等耗时耗力的方式,提出一种创新性的检测方案。仿真分析不同接地网布局方式下接地导体的频率响应特性,探讨不同电流注入方式对频率响应曲线的影响。随后,进一步仿真了接地网存在腐蚀或断裂时导体上方地表电位分布的情况,得出利用地表电位节点电压的接地网故障状态判断方法。结果表明:不同的接地方式具有相似的频率特性,当接地体半径发生变化时,接地阻抗会出现明显差异; 利用地表节点电位值可以准确判断接地网的故障状态,能够区分断点和腐蚀情况,并定位断点位置和腐蚀范围; 曼哈顿距离函数可以量化腐蚀和断裂的特征,提高对故障特征的辨识能力。
- Abstract:
- In addressing the time-consuming and labor-intensive diagnostic process for current grounding grid faults, we propose an innovative detection approach. The frequency response characteristics of grounding conductors are simulated and analyzed under various grounding grid layouts, investigating the influence of different current injection methods on the frequency response curve. Subsequently, the simulation explores the distribution of surface potential above conductors in the presence of corrosion or breakage in the grounding grid. A fault diagnosis method for grounding grid states is developed using the voltage of surface potential nodes.The results indicate that:Different grounding methods exhibit similar frequency characteristics, with noticeable differences in grounding impedance when the grounding body radius changes.The use of surface potential values enables accurate determination of the grounding grid’s fault state, distinguishing between breakage and corrosion, and providing localization of breakage points and corrosion extents.The Manhattan distance function can quantify the characteristics of corrosion and breakage, enhancing the ability to identify fault features.
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备注/Memo
收稿日期:2023-12-08
基金项目:四川省科技重点研发资助项目(2022YFG0234)
通信作者:邹杰.E-mail:1094648444@qq.com