考虑非线性极化的接地极对管道泄漏电流计算及验证
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摘要
直流接地极对邻近埋地油气管道的腐蚀影响和危险影响问题日益突出,迫切需要更为准确的计算方法。文中在前续研究的基础上,将管道和接地装置使用矩量法建立等效电路模型,将管道表面破损处的极化效应考虑为非线性受控电压源,由此给出了考虑金属表面非线性极化的直流接地极对埋地金属管道影响计算方法。并通过搭建高压直流接地极和油气管道的缩比试验模型进行实验研究,得出了管道表面的断电电位和泄漏电流密度。基于实验结果对计算方法进行了有效性验证,结果表明该计算方法与测试结果在工程应用范围内吻合较好,可为工程应用提供估算参考。
The corrosion and hazard effects of DC earth electrode on adjacent buried oil and gas pipelines are becoming increasingly prominent,and more accurate calculation methods are urgently needed. On the basis of previous research,the equivalent circuit model of pipeline and grounding device is established by moment method,and the polarization effect at the damaged surface of pipeline is considered as a non-linear controlled voltage source. A calculation method considering the nonlinear polarization effect of DC earth electrode on the surface of buried metal pipeline is proposed. In the rectangular tank of grounding Laboratory of UHV AC test base,the scaling test model of HVDC earth electrode and oil and gas pipeline is built to carry out experimental research. The validity of the calculation method proposed in this paper is verified. The results show that the calculation method is in good agreement with the test results,and it can provide an estimation reference for engineering application.
The corrosion and hazard effects of DC earth electrode on adjacent buried oil and gas pipelines are becoming increasingly prominent,and more accurate calculation methods are urgently needed. On the basis of previous research,the equivalent circuit model of pipeline and grounding device is established by moment method,and the polarization effect at the damaged surface of pipeline is considered as a non-linear controlled voltage source. A calculation method considering the nonlinear polarization effect of DC earth electrode on the surface of buried metal pipeline is proposed. In the rectangular tank of grounding Laboratory of UHV AC test base,the scaling test model of HVDC earth electrode and oil and gas pipeline is built to carry out experimental research. The validity of the calculation method proposed in this paper is verified. The results show that the calculation method is in good agreement with the test results,and it can provide an estimation reference for engineering application.
引文
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[17]李丹丹.高压直流输电线路对某埋地金属管道的干扰规律研究[D].成都:西南石油大学,2014.LI Dandan. Research on the disturbance law of HVDC transmission line to a buried metal pipeline[D]. Chengdu:Southwest Petroleum University,2014.
[18]秦润之,杜艳霞,姜子涛,等.高压直流输电系统对埋地金属管道的干扰研究现状[J].腐蚀科学与防护技术,2016,28(3):263-268.QIN Runzhi,DU Yanxia,JIANG Zitao,et al. Research status of interference of HVDC transmission system on buried metal pipelines[J]. Corrosion Science and Protection Technology,2016,28(3):263-268.
[19]曹方圆,孟晓波,廖永力,等.直流接地极对埋地金属管道影响的电路模型及应用[J].电网技术,2016,40(10):3258-3264.CAO Fangyuan,MENG Xiaobo,LIAO Yongli,et al. Circuit model and application for influence of DC ground electrode on buried metal pipelines[J]. Power System Technology,2016,40(10):3258-3264.
[20]孟晓波,曹方圆,廖永力,等.抑制直流接地极影响的管道绝缘防护措施分析[J].高电压技术,2017,43(12):3900-3906.MENG Xiaobo,CAO Fangyuan,LIAO Yongli,et al. Analysis of insulation methods to reduce influences of DC grounding electrode on pipeline[J]. High Voltage Engineering,2017,43(12):3900-3906.
[21]詹宏昌.天然气管道外腐蚀与防护[J].广州化工,2011,39(11):127-129.ZHAN Hongchang. External corrosion and protection for natural gas pipelines[J]. Guangzhou Chemical Industry,2011,39(11):127-129.
[22]曹楚南.腐蚀电化学原理(第三版)[M].北京:化学工业出版社,2008.CAO Chunan. Principle of corrosion electrochemistry(3rd)[M]. Beijing:Chemical Industry Press,2008.
[2]魏德军.直流接地极对地下金属设施的电腐蚀影响[J].电网技术,2008,32(2):75-77.WEI Dejun. Electro-corrosion impacts of DC grounding electrode on underground metallic facilities[J]. Power System Technology,2008,32(2):75-77.
[3]刘昌,孟晓波,樊灵孟,等.直流工程接地极入地电流对埋地金属管道的影响[J].南方电网技术,2015,9(3):15-20.LIU Chang,MENG Xiaobo,FAN Lingmeng,et al. Influence of ground return current from HVDC earthing electrode on buried metal pipeline[J]. Southern Power System Technology,2015,9(3):15-20.
[4]应斌.高压直流输电系统接地极对长输管道安全运行的影响[J].油气田地面工程,2014,33(7):23-24.YING Bin. Influence of grounding pole of HVDC system on safe operation of long-distance pipeline[J]. Oil-Gas Field Surface Engineering,2014,33(7):23-24.
[5]邹强,马云龙,杨建明,等.串联多端直流输电系统接地极拓扑研究[J].电力工程技术,2018,37(5):132-136.ZOU Qiang,MA Yunlong,YANG Jianming,et al. Electrode Topology Research in Series Multi-terminal HVDC Transmission System[J]. Electric Power Engineering Technology,2018,37(5):132-136.
[6]曹阿林.埋地金属管线的杂散电流腐蚀防护研究[D].重庆:重庆大学,2010.CAO Alin. Protection against stray current corrosion of buried metals pipeline[D]. Chongqing:Chongqing University,2010.
[7] NICHOLSON P. Study details HVDC stray-current effects on pipelines[J]. Oil&Gas Journal,2010,108(20):74-78.
[8]李勋,黄荣辉,伍国兴,等.输电杆塔雷击接地模型对附近管道运行安全影响研究[J].智慧电力,2017,45(10):25-30.LI Xun,HUANG Ronghui,WU Guoxing,et al. Research of lightning grounding model of transmission tower and its influence on safety operation of nearby pipeline[J]. Smart Power,2017,45(10):25-30.
[9]朱轲,吴驰,扬威.直流接地极对附近输电线路杆塔的腐蚀影响及防护措施的研究[J].高压电器,2011,47(10):41-47.ZHU Ke,WU Chi,YANG Wei. Research on the corrosion influence of the HVDC earth electrode on the nearby transmission line towers and the towers'protective measures[J]. High Voltage Apparatus,2011,47(10):41-47.
[10]迟兴和,张玉军.直流接地极与大地中金属管道的防护距离[J].电网技术,2008,32(2):71-74.CHI Xinghe, ZHANG Yujun. Protective distance between HVDC electrode and underground metal pipeline[J]. Power System Technology,2008,32(2):71-74.
[11]张波,何金良,曾嵘.电力系统接地技术现状及展望[J].高电压技术,2015,41(8):2569-2582.ZHANG Bo,HE Jinliang,ZENG Rong. State of art and prospect of grounding technology in power system[J]. High Voltage Engineering,2015,41(8):2569-2582.
[12]陈庆涛,田宇,丁国成,等.基于灵敏度分析的直流输电接地极优化选址方法研究[J].电力系统保护与控制,2018,46(21):125-130.CHEN Qingtao,TIAN Yu,DING Guocheng,et al. Optimization method of grounding pole location for HVDC transmission system based on sensitivity analysis[J]. Power System Protection and Control,2018,46(21):125-130.
[13]陈水明,施广德.圆环形直流输电接地极电流场分析[J].高电压技术,1994,20(1):3-7.CHEN Shuiming,SHI Guangde. Analysis of current fields near ring-type HVDC ground electrode[J]. High Voltage Engineering,1994,20(1):3-7.
[14]曾嵘,张波,赵杰,等. HVDC地中直流对交流系统的影响及规律分析[J].高电压技术,2009(3):678-682.ZENG Rong,ZHANG Bo,ZHAO Jie,et al. Influence and characteristics analysis of effect of the HVDC ground return current on AC system[J]. High Voltage Engineering,2009(3):678-682.
[15]王明新,张强.直流输电系统接地极电流对交流电网的影响分析[J].电网技术,2005,29(3):9-14.WANG Mingxin, ZHANG Qiang. Analysis on influence of ground electrode current in HVDC on AC power network[J].Power System Technology,2005,29(3):9-14.
[16]房媛媛,卢剑.直流接地极的地电流对埋地金属管道腐蚀影响分析[J].南方电网技术,2013,7(6):71-75.FANG Yuanyuan,LU Jian. Analysis on the influence of HVDC grounding electrode's ground current on the corrosion of buried metal pipelines[J]. Southern Power System Technology,2013,7(6):71-75.
[17]李丹丹.高压直流输电线路对某埋地金属管道的干扰规律研究[D].成都:西南石油大学,2014.LI Dandan. Research on the disturbance law of HVDC transmission line to a buried metal pipeline[D]. Chengdu:Southwest Petroleum University,2014.
[18]秦润之,杜艳霞,姜子涛,等.高压直流输电系统对埋地金属管道的干扰研究现状[J].腐蚀科学与防护技术,2016,28(3):263-268.QIN Runzhi,DU Yanxia,JIANG Zitao,et al. Research status of interference of HVDC transmission system on buried metal pipelines[J]. Corrosion Science and Protection Technology,2016,28(3):263-268.
[19]曹方圆,孟晓波,廖永力,等.直流接地极对埋地金属管道影响的电路模型及应用[J].电网技术,2016,40(10):3258-3264.CAO Fangyuan,MENG Xiaobo,LIAO Yongli,et al. Circuit model and application for influence of DC ground electrode on buried metal pipelines[J]. Power System Technology,2016,40(10):3258-3264.
[20]孟晓波,曹方圆,廖永力,等.抑制直流接地极影响的管道绝缘防护措施分析[J].高电压技术,2017,43(12):3900-3906.MENG Xiaobo,CAO Fangyuan,LIAO Yongli,et al. Analysis of insulation methods to reduce influences of DC grounding electrode on pipeline[J]. High Voltage Engineering,2017,43(12):3900-3906.
[21]詹宏昌.天然气管道外腐蚀与防护[J].广州化工,2011,39(11):127-129.ZHAN Hongchang. External corrosion and protection for natural gas pipelines[J]. Guangzhou Chemical Industry,2011,39(11):127-129.
[22]曹楚南.腐蚀电化学原理(第三版)[M].北京:化学工业出版社,2008.CAO Chunan. Principle of corrosion electrochemistry(3rd)[M]. Beijing:Chemical Industry Press,2008.