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Study on the Mechanism and Influencing Factors of High Voltage Direct Current Interference

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.

Product Number: 51317--9293-SG
ISBN: 9293 2017 CP
Author: Zitao Jiang
Publication Date: 2017
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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

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

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