某天然气长输埋地管线长沙段杂散电流干扰检测及排流实践

李德明, 郑策, 刘宇翔, 王钻, 惠海军, 郑智勇, 李志

doi:10.16577/j.issn.1001-1560.2022.0232

材料保护 >

2022 , Vol. 55 >Issue 8: 171 - 177

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0232

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某天然气长输埋地管线长沙段杂散电流干扰检测及排流实践

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(1. 国家石油天然气管网集团有限公司西气东输分公司，湖南长沙 410199；2. 武汉远西防腐科技有限责任公司，湖北武汉 430040)

王钻(1990-)，工程师，本科，主要从事管道腐蚀检测与防护技术，电话：13343437853，E - mail：934915795@qq.com

收稿日期: 2022-05-28

修回日期: 2022-06-14

录用日期: 2022-06-30

网络出版日期: 2023-12-17

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Stray Current Interference Detection and Drainage Practice of the Changsha Section of a Long - Distance Buried Natural Gas Pipeline

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(1. West to East Gas Transmission Branch of National Oil and Gas Pipeline Network Group Co., Ltd., Changsha 410199, China;2. Wuhan Yuanxi Anticorrosion Technology Co., Ltd., Wuhan 430040, China)

Received date: 2022-05-28

Revised date: 2022-06-14

Accepted date: 2022-06-30

Online published: 2023-12-17

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摘要

某天然气长输埋地管线长沙区域段沿途与多处高压输电线路及高铁伴行或交叉，且轨道交通A线新近投入试运行，输气管道受到交直流杂散电流混合干扰，阴极站恒电位仪无法稳定运行，部分管段交流干扰电压达18 V。针对交直流杂散电流混合干扰的问题采取了强制排流+负电位接地排流的复合排流方法进行处理，并对极性排流及固态去耦合器接地排流方法进行了分析对比，结果表明强制排流+负电位接地排流的复合排流方法对交直流混合杂散电流干扰具有优良的缓解效果。

关键词： 杂散电流; 复合干扰; 长输管道; 阴极保护; 排流

本文引用格式

李德明, 郑策, 刘宇翔, 王钻, 惠海军, 郑智勇, 李志 . 某天然气长输埋地管线长沙段杂散电流干扰检测及排流实践[J]. 材料保护, 2022 , 55(8) : 171 -177 . DOI: 10.16577/j.issn.1001-1560.2022.0232

Abstract

The Changsha section of a long - distance buried natural gas pipeline had many accompanying and cross high - voltage transmission lines and high - speed railways. In addition, the metro rail transit line A was recently put into trial operation. All these above made the gas transmission pipeline subjected to mixed interference of AC and DC stray currents, the cathode station potentiostat could not operate stably, and the AC interference voltage of some pipeline sections was up to 18 V. The composite drainage method combining the forced drainage with the negative potential grounding drainage was adopted to solve the problem of mixed interference of AC and DC stray currents, and the polarity drainage and solid - state decoupler grounding drainage methods were analyzed and compared. Results showed that the composite drainage method combining the forced drainage with the negative potential grounding drainage had excellent mitigation effect on the mixed interference of AC and DC stray currents.

Key words： stray current; mixed interference; long - distance pipeline; cathodic protection; drainage

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