输电线路杆塔接地状态在线监测技术研究
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摘要
采用人工方式监测输电线路杆塔接地状态时,存在测量时间较长,无法及时监测故障点的弊端,因此研究一种输电线路杆塔接地状态在线监测方法。分析输电线路杆塔接地在线监测原理,获取故障发生时接地电位与入地电流,修正不同形状接地装置,利用平均电位求出输电线路杆塔接地电阻,再计算加入埋深与降阻剂的输电线路杆塔接地装置电阻,以及考虑4个基础接地电阻并联得到的最终接地电阻;故障检测器中设定电流数值,若通过该输电线路杆塔工频接地电流比设定电流大,则故障指示器提示故障,接地电流短路时,依据差动电路原理通过传感器确认故障杆塔位置。实验结果表明,该方法可准确检测出输电线路杆塔接地电阻与故障点准确位置,监测电阻误差均低于0.1Ω,监测效率高。
In allusion to the disadvantages of long measurement time and inability to monitor the fault points in time when the manual mode is adopted for grounding state monitoring of the power transmission line tower, a grounding state online monitoring method is researched for the power transmission line tower. The principle of grounding online monitoring is analyzed for the power transmission line tower. The grounding potential and grounding current at fault occurrence are obtained. The grounding devices of different shapes are modified. The grounding resistance of the power transmission line tower is solved by using the average potential. The resistance of the grounding device with buried depth and resistance reducing agent added is calculated for the power transmission line tower. The final grounding resistance is obtained by considering the parallel value of four basic grounding resistors. The current value of the fault detector is set. The fault indicator indicates the fault if the power frequency grounding current passing through the power transmission line tower is larger than the set current. The location of the fault tower is determined by the sensor according to the principle of the differential circuit if the grounding current is short-circuited. The experimental results show that the method can accurately detect the grounding resistance of the power transmission line tower and the accurate location of the fault point, and the resistance monitoring errors are all lower than 0.1 Ω, which indicates that the method has a high monitoring efficiency.
In allusion to the disadvantages of long measurement time and inability to monitor the fault points in time when the manual mode is adopted for grounding state monitoring of the power transmission line tower, a grounding state online monitoring method is researched for the power transmission line tower. The principle of grounding online monitoring is analyzed for the power transmission line tower. The grounding potential and grounding current at fault occurrence are obtained. The grounding devices of different shapes are modified. The grounding resistance of the power transmission line tower is solved by using the average potential. The resistance of the grounding device with buried depth and resistance reducing agent added is calculated for the power transmission line tower. The final grounding resistance is obtained by considering the parallel value of four basic grounding resistors. The current value of the fault detector is set. The fault indicator indicates the fault if the power frequency grounding current passing through the power transmission line tower is larger than the set current. The location of the fault tower is determined by the sensor according to the principle of the differential circuit if the grounding current is short-circuited. The experimental results show that the method can accurately detect the grounding resistance of the power transmission line tower and the accurate location of the fault point, and the resistance monitoring errors are all lower than 0.1 Ω, which indicates that the method has a high monitoring efficiency.
引文
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[2]俞越中,朱海峰,张子阳,等.输电线路杆塔接地体选材研究[J].材料科学与工艺,2017,25(5):25-31.YU Yuezhong,ZHU Haifeng,ZHANG Ziyang,et al. Research on material selection of transmission tower grounding body[J].Materials science and technology,2017,25(5):25-31.
[3]李臻奇,蔡翔,易浩,等.考虑接地电阻特性影响的差异性杆塔接地设计[J].电力科学与技术学报,2016,31(4):168-174.LI Zhenqi,CAI Xiang,YI Hao,et al. Study on difference tower grounding considering the characteristics of the grounding resistance[J]. Journal of electric power science and technology,2016,31(4):168-174.
[4]齐郑,饶志,杨琳琳.OPGW架空输电系统任一点接地短路电流分布的研究[J].电力系统保护与控制,2016,44(2):86-94.QI Zheng,RAO Zhi,YANG Linlin. Research of current distribution between OPGWs in overhead transmission system with grounding fault at any point[J]. Power system protection and control,2016,44(2):86-94.
[5]成林,孔志战,王森,等.雷电流对杆塔接地装置冲击特性影响规律的研究[J].西安交通大学学报,2017,51(4):53-58.CHENG Lin,KONG Zhizhan,WANG Sen,et al. Influence of lightning current on impulse characteristic of ground device of pole and tower[J]. Journal of Xi’an Jiaotong University,2017,51(4):53-58.
[6]肖微,胡元潮,阮江军,等.柔性石墨复合接地材料及其接地特性[J].电工技术学报,2017,32(2):85-94.XIAO Wei,HU Yuanchao,RUAN Jiangjun,et al. Flexible graphite composite electrical grounding material and its grounding application features[J]. Transactions of China Electrotechnical Society,2017,32(2):85-94.
[7]马御棠,陈奎,易志兴,等.超高压交流输电线路融冰避雷线绝缘架设对杆塔接地安全的影响[J].高电压技术,2016,42(2):650-656.MA Yutang,CHEN Kui,YI Zhixing,et al. Effect of ice-melting ground wire insulation erection of EHV AC transmission lines on grounding safety of tower[J]. High voltage engineering,2016,42(2):650-656.
[8]李伟,向常圆,文习山,等.特高压输电线路杆塔雷电流分布的仿真[J].高电压技术,2016,42(8):2642-2650.LI Wei,XIANG Changyuan,WEN Xishan,et al. Simulation of lightning current distribution in UHV transmission line towers[J]. High voltage engineering,2016,42(8):2642-2650.
[9]甘艳,邹建明,张昌,等.柔性石墨接地体在山区杆塔接地网中的应用[J].科学技术与工程,2017,17(10):198-201.GAN Yan,ZOU Jianming,ZHANG Chang,et al. The application of flexible graphite composite electrical grounding material in mountain grounding grid[J]. Science technology and engineering,2017,17(10):198-201.
[10]张福轩,万建成,程更生,等.架空输电线路铁塔组立施工技术标准体系优化研究与建议[J].中国电力,2017,50(11):59-64.ZHANG Fuxuan,WAN Jiancheng,CHENG Gengsheng,et al. Optimization research on technical standard system for assembly and erection construction of the steel towers of overhead transmission line[J]. Electric power,2017,50(11):59-64.
[11]黄新波,廖明进,徐冠华,等.采用光纤光栅传感器的输电线路铁塔应力监测方法[J].电力自动化设备,2016,36(4):68-72.HUANG Xinbo,LIAO Mingjin,XU Guanhua,et al. Stress monitoring method applying FBG sensor for transmission line towers[J]. Electric power automation equipment,2016,36(4):68-72.
[12]黄志都,邓雨荣,吴彪,等.110 kV绝缘杆塔输电线路雷电侵入波过电压研究[J].南方电网技术,2017,11(1):45-51.HUANG Zhidu,DENG Yurong,WU Biao,et al. Research on lighting intruding wave overvoltage of 110 kV insulated tower transmission line[J]. Southern power system technology,2017,11(1):45-51.
[13]刘爽,胡新芳.输电线路铁塔腐蚀等级评定规则[J].腐蚀与防护,2017,38(12):969-973.LIU Shuang, HU Xinfang. Evaluation rules for corrosion grade of transmission line tower[J]. Corrosion and protection,2017,38(12):969-973.
[14]黄新波,陈子良,赵隆,等.110 kV输电线路铁塔塔基沉降应力仿真分析与试验[J].电力自动化设备,2017,37(4):153-158.HUANG Xinbo,CHEN Ziliang,ZHAO Long,et al. Stress simulation and experiment for tower foundation settlement of110 kV transmission line[J]. Electric power automation equipment,2017,37(4):153-158.
[15]罗金盛.电力系统接地电阻精确测量仿真研究[J].计算机仿真,2017,34(10):97-100.LUO Jinsheng. Simulation study on accurate measurement of grounding resistance in power system[J]. Computer simulation,2017,34(10):97-100.