高压直流接地极对埋地油气管道腐蚀影响的等效电流研究
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摘要
为定量且有效的评估高压直流接地极对埋地油气管道的腐蚀影响程度,需要提出一个兼顾高压直流接地极强电流(单极大地运行方式)和不平衡电流(双极对称运行)运行特性的等效电流。在分析了高压直流接地极入地电流特性的基础上,从腐蚀量的角度,给出了等效电流的确定方法。利用考虑直流极化效应的计算方法,获得了管道破损点处泄漏电流密度与直流接地极入地电流大小、接近距离等物理量之间的函数对应关系,并通过函数拟合,给出了等效电流的计算公式。
In order to quantitatively and effectively evaluate the impact of HVDC grounding electrode on corrosion of buried oil/gas pipelines, an equivalent current is proposed, considering the operation characteristics of strong current(single pole-ground operation mode) and unbalanced current(bipolar symmetrical operation) in HVDC grounding electrode. Based on analysis of the characteristics of grounding current of HVDC grounding electrode, a method determining equivalent current is proposed from the point of view of corrosion amount. By using the calculation method considering DC polarization effect, the functional correspondence between leakage current density at pipeline breakage point and physical quantities such as DC grounding current, approaching distance and so on is obtained, and the calculation formula of equivalent current is given through function fitting.
In order to quantitatively and effectively evaluate the impact of HVDC grounding electrode on corrosion of buried oil/gas pipelines, an equivalent current is proposed, considering the operation characteristics of strong current(single pole-ground operation mode) and unbalanced current(bipolar symmetrical operation) in HVDC grounding electrode. Based on analysis of the characteristics of grounding current of HVDC grounding electrode, a method determining equivalent current is proposed from the point of view of corrosion amount. By using the calculation method considering DC polarization effect, the functional correspondence between leakage current density at pipeline breakage point and physical quantities such as DC grounding current, approaching distance and so on is obtained, and the calculation formula of equivalent current is given through function fitting.
引文
[1]孟晓波,廖永力,李锐海,等.金属管道受入地电流影响的抑制措施研究[J].南方电网技术,2015,9(2):62-67.Meng Xiaobo,Liao Yongli,Li Ruihai,et al.Research on repressive measures of the influence of the ground return current on the metallic pipeline[J].Southern Power System Technology,2015,9(2):62-67(in Chinese).
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[4]程明,张平.鱼龙岭接地极入地电流对西气东输二线埋地钢质管道的影响分析[J].天然气与石油,2010,28(5):22-26.Cheng Ming,Zhang Ping.The influence on second west to east pipeline of Yulongling grounding electrode current[J].Natural Gas and Oil,2010,28(5):22-26(in Chinese).
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[6]张建宾,孟静,尚兴彬.后建接地极对埋地管道的干扰[J].腐蚀与防护,2018,39(1):52-54.Zhang Jianbin,Meng Jing,Shang Xingbin.Interference of second-building grounding electrode on buried pipeline[J].Corrosion&Protection,2018,39(1):52-54(in Chinese).
[7]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(in Chinese).
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[9]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(in Chinese).
[10]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(in Chinese).
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[13]黄义隆,张波,国建宝,等.改善直流电流地中分布的接地极互联技术研究[J].电网技术,2017,41(4):1338-1344.Huang Yilong,Zhang Bo,Guo Jianbao,et al.Research on Improving DC current distribution in earth by interconnecting DC grounding electrodes[J].Power System Technology,2017,41(4):1338-1344(in Chinese).
[14]DL/T 5224-2014.高压直流输电大地返回系统设计技术规程[S].
[15]中国电力科学研究院.直流接地极对邻近埋地金属管道的防护措施研究[R].北京:中国电力科学研究院,2013.
[16]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):3258-3265.Cao Fangyuan,Meng Xiaobo,Liao Yongli,et al.Circuit model and application for the influence of DC Ground electrode on buried metal pipeline[J].Power System Technology,2016,40(10):3258-3265(in Chinese).
[17]Dawalibi F P,Donoso F.Integrated analysis software for grounding,EMF,and EMI[J].Computer Applications in Power,IEEE,1993,6(2):19-24.
[18]商善泽.直流接地极入地电流对埋地金属管道腐蚀影响的研究[D].北京:华北电力大学,2016.
[19]陈凡,饶宏,李岩,等.结合矩量法和边界元法的综合接地算法研究[J].高电压技术,2012,38(3):729-736.Chen Fan,Rao Hong,Li Yan,et al.Numerical analysis method combining method of moments and boundary element method on grounding calculation[J].High Voltage Engineering,2012,38(3):729-736(in Chinese).
[20]Seber G A F,Wild C J.Nonlinear Regression[M].Hoboken,NJ:Wiley-Interscience,2003.
[2]白锋,陆家榆,林珊珊,等.特高压交直流输电线路同走廊正常运行时对邻近埋地油气管道的电磁影响分析[J].电网技术,2016,40(11):3609-3614.Bai Feng,Lu Jiayu,Lin Shanshan,et al.Analysis of electromagnetic effect of UHVAC and DC transmission lines in same corridor in normal operation on adjacent petroleum&gas pipelines[J]Power System Technology,2016,40(11):3609-3614(in Chinese).
[3]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 HVDCelectrode and underground metal pipe[J].Power System Technology,2008,32(2):71-74(in Chinese).
[4]程明,张平.鱼龙岭接地极入地电流对西气东输二线埋地钢质管道的影响分析[J].天然气与石油,2010,28(5):22-26.Cheng Ming,Zhang Ping.The influence on second west to east pipeline of Yulongling grounding electrode current[J].Natural Gas and Oil,2010,28(5):22-26(in Chinese).
[5]Chi X H,Zhang Y J.Protective distance between HVDC electrode and underground metal pipeline[J].Power System Technology,2008,32(2):71-74.
[6]张建宾,孟静,尚兴彬.后建接地极对埋地管道的干扰[J].腐蚀与防护,2018,39(1):52-54.Zhang Jianbin,Meng Jing,Shang Xingbin.Interference of second-building grounding electrode on buried pipeline[J].Corrosion&Protection,2018,39(1):52-54(in Chinese).
[7]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(in Chinese).
[8]王文涛.高压交、直流电力设施对埋地管道的干扰危害及检测[J].石油和化工设备,2009,12(9):51-55.Wang Wentao.The harm and detection of high voltage AC or DCelectrical accessories and supplies manufacture on buried pipe[J].Petro&Chemical Equipment,2009,12(9):51-55(in Chinese).
[9]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(in Chinese).
[10]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(in Chinese).
[11]解广润.电力系统接地技术[M].北京:水利电力出版社,1991.
[12]刘振亚.特高压电网[M].北京:中国经济出版社,2005:14-35.
[13]黄义隆,张波,国建宝,等.改善直流电流地中分布的接地极互联技术研究[J].电网技术,2017,41(4):1338-1344.Huang Yilong,Zhang Bo,Guo Jianbao,et al.Research on Improving DC current distribution in earth by interconnecting DC grounding electrodes[J].Power System Technology,2017,41(4):1338-1344(in Chinese).
[14]DL/T 5224-2014.高压直流输电大地返回系统设计技术规程[S].
[15]中国电力科学研究院.直流接地极对邻近埋地金属管道的防护措施研究[R].北京:中国电力科学研究院,2013.
[16]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):3258-3265.Cao Fangyuan,Meng Xiaobo,Liao Yongli,et al.Circuit model and application for the influence of DC Ground electrode on buried metal pipeline[J].Power System Technology,2016,40(10):3258-3265(in Chinese).
[17]Dawalibi F P,Donoso F.Integrated analysis software for grounding,EMF,and EMI[J].Computer Applications in Power,IEEE,1993,6(2):19-24.
[18]商善泽.直流接地极入地电流对埋地金属管道腐蚀影响的研究[D].北京:华北电力大学,2016.
[19]陈凡,饶宏,李岩,等.结合矩量法和边界元法的综合接地算法研究[J].高电压技术,2012,38(3):729-736.Chen Fan,Rao Hong,Li Yan,et al.Numerical analysis method combining method of moments and boundary element method on grounding calculation[J].High Voltage Engineering,2012,38(3):729-736(in Chinese).
[20]Seber G A F,Wild C J.Nonlinear Regression[M].Hoboken,NJ:Wiley-Interscience,2003.