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High voltage direct current (HVDC) transmission results in a large direct current will into the earth. This may cause interference on a buried pipeline even though it is far from the earth electrode. In this work, numerical simulation was used to study the mechanism and influencing factors of HVDC interference.
While the high voltage direct current (HVDC) system runs in monopole-ground mode thousands of amperes direct current will flow into earth through its earth electrode. This current may cause serious interference on buried pipeline even though it is far away from the earth electrode. Field testing results indicate that this interference may arrive beyond one hundred kilometers and induce hundreds of volt interference potential on the pipeline. In this work numerical simulation were used to study the mechanism of HVDC interference and analyze influencing factors. The results indicated that while a large direct current flowed into the soil it could create a strong electric field and induce serious interference on the pipeline. In addition influencing factors study indicated that the better the pipeline coating was the higher interference the pipeline suffered from. Soil structure and soil resistivity had great effect on HVDC interference so that the HVDC interference was greatly different in different parts of the world. Mitigation grounding beds had interaction with each other. The mitigating effectiveness was decided by the location and ground resistance of each mitigation grounding bed. Finally field experiments were carried out to verify numerical simulation results.
Key words: HVDC interference, Mitigation, Numerical simulation, Field test
Field tests found that a natural gas pipeline system was interfered by a high voltage direct current electrode. Interference level was computed and agreed with measured values, validating the model. The effectiveness of various mitigation methods was computed and discussed,
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This paper will outline the effect of stray current that originates from an HVDC transmission system that runs parallel to and crosses a crude oil and natural gas pipeline system.
In this paper exhaustive field study trials to monitor the pipe to soil potential over an extended time period and subsequent analysis of data has been discussed with reference to the critical Combined Cathodic and Anodic Interference phenomena observed on pipelines.