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为了评价带有阴极保护的埋地钢质管道的交流腐蚀和过保护, 建立了一种以直流和交流电流密度为基础的新的阴极保护标准, 并且为了使用这一新标准来评估管线的交流腐蚀风险, 还开发出一种新型便携式装置, 该装置能够在现场同时测试直流和交流电流密度。雷电冲击和地床的老化都会导致整流器故障风险的增大, 为了即时确定整流器故障并随时进行调校, 开发了一种整流器在线监测系统。新的阴极保护维护管理程序由下列两部分组成: ①采用新标准和新装置进行阴极保护的保护电位监测; ②新敷设的管线附近上方布有高压输电线路, 用在线监测系统对整流器进行遥测。使用电晶体直流去耦装置成功测定出交流腐蚀风险, 并将其消除。另外, 还成功地进行了整流器的可靠性遥测, 确保整流器提供足够的阴极保护电流。最后, 应用这些新技术建立了阴极保护维护管理的新理念。
In order to evaluate the AC corrosion and over-protection of buried steel pipelines with cathodic protection, a new cathodic protection standard based on DC and AC current densities was established and in order to use this new standard to evaluate the pipeline exchange Corrosion risk, but also developed a new type of portable devices, the device can test both DC and AC current density in the field. Lightning impingement and the aging of the ground will lead to increased risk of rectifier failure, in order to immediately determine the rectifier fault and be adjusted at any time, developed a rectifier online monitoring system. The new cathodic protection maintenance program consisted of the following two components: (1) monitoring the protective potential of cathodic protection using new standards and new installations; (2) high voltage transmission lines over the newly laid pipelines; and telemetry of the rectifier with on-line monitoring systems. The DC decoupling device is used to successfully determine the AC corrosion risk and eliminate it. In addition, the reliability of the rectifier has been successfully telemetered to ensure that the rectifier provides sufficient cathodic protection current. Finally, the application of these new technologies has established a new concept of cathodic protection maintenance and management.