在线腐蚀速率监测系统在特高压直流输电系统干扰管段的应用  

Application of On-line Corrosion Rate Monitoring Systemin Interference Pipe of HVDC Transmission System

作　　者：王若丹 WANG Ruo-dan(Western Branch of PetroChina Pipeline Co.,Ltd.Urumqi 830013,China)

机构地区：[1]中石油管道有限责任公司西部分公司,新疆乌鲁木齐830013

出　　处：《全面腐蚀控制》2020年第11期32-35,43,共5页Total Corrosion Control

摘　　要：特高压直流输电系统在系统调试或发生故障情况下,需要采用单极大地回线方式运行,单极运行时接地极对地放电,对附近埋地管道干扰较大。特高压直流输电系统单极运行有不规律性、突发性等特点,之前监测只能通过管道电位变化判断干扰程度,无法直接反映管道的受影响情况。本次通过安装在线腐蚀速率监测系统,对被干扰区域内管道的管地电位、腐蚀速率等参数开展连续监测,掌握了接地极在不同单极运行模式下对阴极保护系统的干扰影响规律及附近管道存在的腐蚀风险。Under the circumstances of commissioning or emergency,the HVDC transmission system requires to be operated in the monopolar configuration with earth return,which imposes interference threat on the proximate underground metallic structures.The monopolar operation of HVDC transmission system is characterized by irregularity and sudden occurrence,the previous monitoring can only judge the degree of interference through the potential change of the pipeline,which cannot directly reflect the affected condition of the pipeline.Through the installation of an online corrosion rate monitoring system,continuous monitoring was carried out for the parameters such as pipeline ground potential and corrosion rate in the disturbed area,and the law of the influence of grounding electrode on the cathodic protection system under different monopolar operation modes and the corrosion risk of nearby pipelines were mastered.

关 键 词：特高压直流输电系统 单极运行 埋地管道 在线腐蚀速率监测 ER腐蚀速率探头 

分 类 号：TG174.3[金属学及工艺—金属表面处理]