直流接地极电流干扰下阴极保护电源输出对管道电位分布的影响

Effect of Output of Cathodic Protection Power Supply on Potential Distribution of Pipeline under DC Grounding Electrode Current Interference

利用管道上已有的防护措施降低直流接地极电流对管道的影响。在昌吉-古泉±1100 kV特高压直流输电工程调试期间,对邻近的川气东送管道电位进行了测试,并主动调节了阴保站内阴极保护电源的输出电流大小,获得了直流接地极电流干扰下,阴极保护电源的输出电流对管道电位分布的影响规律。结果表明:增大阴极保护电源的输出电流,管道通电电位会整体下降,距被调整的阴极保护电源越近,管道通电电位下降的幅度越大,反之亦然。在合适位置调整阴极保护电源的输出电流,可以大幅削弱直流接地极电流对管道的干扰,这也为调整管道上防护措施的配置、治理直流接地极电流对管道干扰问题积累了原始数据。

The existing protective measures on pipeline were used to weaken the influence of DC grounding electrode current on the pipeline.During the commissioning of Changji-Guquan±1100 kV ultra-high voltage direct current(UHVDC)transmission project,the potentials of nearby Sichuan-East pipeline were tested.The output currents from cathodic protection power supplies were adjusted actively to obtain the effect law of output current from cathodic protection power supply on the potential distribution of the pipeline under the interference of DC grounding electrode current.The results show that the ON potentials reduced as a whole with the increase of output currents from cathodic protection power supplies.The closer to the adjusted cathodic protection power supply,the greater the decrease of ON potential of the pipeline,and vice versa.Adjusting the output current from cathodic protection power supply at the right position could greatly reduce the interference of DC grounding electrode current to pipelines,which might also accumulate the original data for adjusting the configuration of protective measures on the pipeline and controlling the interference of DC grounding electrode current to pipelines.