引用本文:刘 琨,崔 鑫,王 宾,等.配电线路经生物体高阻接地故障特性对比分析[J].电力系统保护与控制,2021,49(22):67-74.
LIU Kun,CUI Xin,WANG Bin,et al.Comparative analysis of high impedance grounding fault characteristics via an organism in distribution lines[J].Power System Protection and Control,2021,49(22):67-74
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配电线路经生物体高阻接地故障特性对比分析
刘 琨1,2，崔 鑫3，王 宾3，李一泉1,2，邓旭阳1,2，陈桥平1,2，王育学1,2，刘世丹1,2
1.广东电网有限责任公司电力调度控制中心, 广东 广州 510600；2.广东电网有限责任公司 RTDS继电保护仿真重点实验室，广东 广州 510600；3.电力系统及发电设备安全控制和 仿真国家重点试验室(清华大学电机系)，北京 100084
摘要:
配电网高阻接地故障电气量微弱，特征复杂，实现对此类故障检测的成功率较低。如果故障发生而未能被及时发现、切除，可能给设备、人员安全带来极大的危害。现有的研究对不同类型的高阻接地介质，尤其是人体介质的阻抗性质及故障特征分析不足。针对该问题，基于对数电弧模型及人体阻抗模型从时、频域角度利用图形对比分析、傅里叶变换等技术分析了非生物体导电介质与人体介质的阻抗特性及故障特征。结合现场试验数据，验证了两类介质的阻抗特性及其典型故障特征。以上分析为后续设计有效的配电网高阻接地故障检测方案奠定了基础。
关键词:  配电网  高阻  特征分析  人体  非生物体介质
DOI：DOI: 10.19783/j.cnki.pspc.210029
分类号:
基金项目:国家自然科学基金项目资助(52077116)；广东电网有限责任公司科技项目资助(GDKJXM20184472)
Comparative analysis of high impedance grounding fault characteristics via an organism in distribution lines
LIU Kun1, 2, CUI Xin3, WANG Bin3, LI Yiquan1, 2, DENG Xuyang1, 2, CHEN Qiaoping1, 2, WANG Yuxue1, 2, LIU Shidan1, 2
1. Power Dispatch Control Center of Guangdong Power Grid Co., Ltd., Guangzhou 510600, China; 2. Key Lab for Protective Relaying Real Time Digital Simulation of Guangdong Power Grid Co., Ltd., Guangzhou 510600, China; 3. State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment (Department of Electric Engineering of Tsinghua University), Beijing 100084, China
Abstract:
The high impedance grounding fault in power distribution networks has weak electric capacity and complex fault characteristics, so the success rate of detecting such fault is low. If the fault occurs and cannot be found and removed in time, it may bring great harm to the safety of equipment and personnel. Existing research on different types of high impedance grounding medium, especially the human body medium, is insufficient to analyze the impedance property and fault characteristics. For this problem, based on the logarithmic arc model and human impedance model, the impedance characteristics of non-living body conductive medium and human body are compared and analyzed from time and frequency domain aspects using the techniques of graphic morphology analysis, Fourier transform and so on. Also, combined with the field test data, the impedance features and typical fault features of the two types of grounding media are verified. The above analysis lays a foundation for the subsequent design of an effective detection scheme for a high impedance grounding fault in power distribution networks. This work is supported by the National Natural Science Foundation of China (No. 52077116) and the Science and Technology Project of Guangdong Power Grid Co., Ltd. (No. GDKJXM20184472).
Key words:  distribution network  high impedance  feature analysis  human body  non-living body medium
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