Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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基于避雷器尾端电流监测的过电压反演可行性研究

来源:电工电气发布时间:2022-11-25 12:25 浏览次数:164

基于避雷器尾端电流监测的过电压反演可行性研究

胡思宇1,郭海霞2,蒯丽娟2,张春辉3,单麒罡2,刘守豹1,董云龙2
(1 大唐水电科学技术研究院有限公司,广西 南宁 530007;
2 大唐观音岩水电开发有限公司,云南 昆明 650011;
3 中国长江电力股份有限公司 技术研究中心,湖北 宜昌 443000)
 
    摘 要:目前已有许多在线监测装置能够成功获取到避雷器过电压的电流、电压信号,也可对过电压作用时刻进行记录,但尚未开展对避雷器冲击电流幅值及波形的记录研究,错过了通过避雷器冲击电流这一信息量丰富的状态量开展数据挖掘的尝试。采用现场试验的方式,对雷电过电压作用下避雷器尾端电流进行了实测,通过建立避雷器有限元场分析模型提取分布参数,使用电磁暂态仿真软件 ATP-EMTP 建立过电压分析模型,仿真得到避雷器尾端冲击电流结果,将实测数据和仿真数据进行对比,验证了基于避雷器尾端电流监测反演避雷器首端过电压幅值和波形的可行性,并提出利用快速傅里叶变换方法,通过尾端电流反演出首端电压,为开展过电压幅值及类别的智能识别提供了技术支撑。
    关键词: 避雷器;过电压;尾端电流;首端电压;快速傅里叶变换
    中图分类号:TM862     文献标识码:A     文章编号:1007-3175(2022)11-0051-05
 
Research on the Feasibility of Overvoltage Inversion by Monitoring
Lightning Arrester Tail-End Current
 
HU Si-yu1, GUO Hai-xia2, KUAI Li-juan2, ZHANG Chun-hui3, SHAN Qi-gang2, LIU Shou-bao1, DONG Yun-long2
(1 Datang Hydropower Science & Technology Research Institute Co., Ltd, Nanning 530007, China;
2 Datang Guanyinyan Hydropower Development Co., Ltd, Kunming 650011, China;
3 Technical Research Center of China Changjiang Electric Power Co., Ltd, Yichang 443000, China)
 
    Abstract: Many online monitoring devices could obtain the signals of current and voltage when the overvoltage of lightning arrester occurs.In addition, those devices could record the moment when the overvoltage operates. However, there is barely any research on recording the amplitude and waveform of the inrush current of the arrester, which means researchers might miss the opportunities of data mining of the inrush current.This paper monitored the current of the arrester tail-end under the action of the lightning overvoltage in the field test. Moreover, it collected the distributed parameter by establishing the analytic model of the arrester and used the ATP-EMTP software to construct the analytic model of overvoltage. This study got the results of the inrush current of the arrester tail-end from the simulation. It compared the testing data with the simulation data, and it verifyed the feasibility of overvoltage inversion by monitoring lightning arrester tail-end current. Moreover, it proposed the fast Fourier transform method and employed tail-end current to invert the head-end voltage. Providing technical support for the intelligent identification of overvoltage amplitude and overvoltage type.
    Key words: lightning arrester; overvoltage; tail-end current; head-end voltage; fast Fourier transform
 
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