高压直流接地极对埋地管道的干扰及防护

Interference and protection of buried pipelines due to HVDC grounding electrode

关键词:  高压直流  接地极  埋地管道  分段隔离  阴极保护

Key words:  high voltage direct current (HVDC)  grounding electrode  buried pipe  insulating flange  catholic protection

摘要:

为探究高压直流接地极对埋地管道的干扰规律以及防护措施，模拟不同入地电流对管地电位的变化规律，并从距离、分段隔离和阴极保护3个方面研究对直流干扰区埋地管道的防护措施。结果表明：管地电位偏移随入地电流的增大而增大，随距离的增大先急剧后缓慢减小；分段隔离+阴极保护措施可保护隔离区域内管段，但可能会对区域外管段产生直流干扰。对于高压直流干扰区管道，在保证接地极与管道最大距离的情况下，可通过分段隔离加阴极保护的方式保护受干扰管道，但应注意隔离区域内的阴保系统对区域外管道的干扰。

Abstract:

In order to study the rules of the interference and protection schemes of the high voltage direct current (HDVC) on the buried pipelines, the process is simulated to study the effect of the electrical current on the pipe-to-soil potential. The electrode-to-pipe distance, insulating flange and catholic protection were simulated. The results show that the deviation of the pipe-to-soil potential increases with the increase of the current, and decreases first sharply and then slowly with the increase of the electrode-to-pipe distance. The protective scheme of insulating flange and catholic protection can protect the pipes in the isolation area, and can cause extra DC interference on pipes out of the isolation area. Therefore, for pipes in the DC interference area, under the condition of guaranteeing the maximal electrode-to-pipe distance, insulating flange and catholic protection can be adopted to protect pipes in the isolation area, and it is noted that the catholic protection system of pipes in the isolation area can cause extra DC interference on other pipes.