外加电流阴极保护系统恒电位仪常见问题探讨  

Discussion on problems of potentiostat in impressed current cathodic protection system

作　　者：何黎 梁栋 王爱玲 陈武 HE Li;LIANG Dong;WANG Ailing;CHEN Wu(PipeChina Southwest Pipeline Co.,Ltd.,Chengdu 610200,China;Beijing Safetech Pipeline Co.,Ltd.,Beijing 102200,China)

机构地区：[1]国家管网集团西南管道有限责任公司,四川成都610200 [2]北京安科管道工程科技有限公司,北京102200

出　　处：《石油化工腐蚀与防护》2024年第3期28-33,共6页Corrosion & Protection In Petrochemical Industry

摘　　要：恒电位仪是外加电流阴极保护系统的核心,一旦发生故障,就会直接影响管道阴极保护的有效性。该文主要介绍了恒电位仪在运行过程中存在的一些问题,并提出了改进措施。恒电位仪关机时,管道自然电位偏负或偏正;共用辅助阳极地床时,由于恒电位仪不同回路的相互干扰较强,造成管道电位波动幅度增大。在地磁干扰下,对比了恒电流和恒电位两种运行模式下管道的阴极保护情况,结果显示,恒电位模式下管道阴极保护效果更佳。对于地铁直流杂散电流干扰环境,不同时间段需求的电流不同,推荐采用可预置不同运行模式及参数的恒电位仪,该恒电位仪可根据设置的时间自动跳转运行模式,在地铁运行时间段以大电流恒电流的模式运行,在地铁停运时间段以小电流恒电位的模式运行。该恒电位仪既可在地铁运行期间通过大电流输出来抑制地铁直流杂散电流干扰,又可在地铁停运期间跳转至小电流输出,以防止管道过保护。Potentiostat was the core of impressed current cathodic protection system.Once a fault occurred,it would directly affect the effectiveness of pipeline cathodic protection.Some problems existing in the operation of potentiostat were introduced and several improvement measures were proposed.When the potentiostat was turned off,natural potential of the pipeline was either negative or positive;When the auxiliary anode ground bed was shared,potential fluctuation amplitude of the pipeline increased due to strong mutual interference of different circuits of potentiostat.Under geomagnetic interference,the cathodic protection of pipelines under two different operating modes of constant current and constant potential was compared.The results showed that the effect of cathodic protection was better under constant potential mode.For the interference environment of subway DC stray current,the required current varied at different time periods.It was recommended to use a potentiostat that can preset different operating modes and parameters.The potentiostat can automatically switch to the operating mode according to the set time;operate in the mode of high current constant current during subway operation time,while run in the mode of low current constant potential during subway shutdown time.The potentiostat can not only suppress the interference of DC stray current by high current output during subway operation,but also jump to low current output during subway shutdown to prevent pipeline over protection.

关 键 词：恒电位仪 共用辅助阳极地床 地磁干扰 地铁直流杂散电流干扰 恒电位 恒电流 

分 类 号：U231.8[交通运输工程—道路与铁道工程]