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51316-7714-HVDC Interference to Buried Pipeline: Numerical Modeling and Continuous P/S Potential Monitoring

Picture for HVDC Interference to Buried Pipeline: Numerical Modeling and Continuous P/S Potential Monitoring
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Product Number: 51316-7714-SG
ISBN: 7714 2016 CP
Author: WuXi Bi
Publication Date: 2016
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As one of the most important way for electricity long-distance transmission High Voltage Direct Current (HVDC) transmission line in China develops very fast. In some regions HVDC interference to pipeline is a main threat to pipeline safety. Based on a realistic HVDC interference project Hami South to Zhengzhou HVDC transmission line numerical modeling tool is used to analyse impact of the running of Hami South grounding with 5000A mono-polar current flowing to the HVDC grounding. This numerical assessing is performed before the HVDC project put into use. The results show Hami South grounding should have negative impact on the nearest pipeline which is 35km away: the most positive P/S potential should be around +0.65V (CSE) due to poor soil conductivity. 5 months later this HVDC put into use meanwhile coutinuous P/S potential monitoring devices are installed on the potentially interfered pipeline section. The most positive P/S potential from monitoring devices is proven to be about +0.50V (CSE). The interference intense from numerical modeling+0.65V (CSE) meets the field monitoring result +0.50V (CSE) very well which proves necessity of numerical modeling in deal with HVDC interference related problems. Moreover 5 and 7 mitigating CP stations with recommended working current outputs are evaluated. The effectiveness of mitigating CP station method is proved by numerical modeling.Keywords: HVDC pipeline interference numerical modeling
As one of the most important way for electricity long-distance transmission High Voltage Direct Current (HVDC) transmission line in China develops very fast. In some regions HVDC interference to pipeline is a main threat to pipeline safety. Based on a realistic HVDC interference project Hami South to Zhengzhou HVDC transmission line numerical modeling tool is used to analyse impact of the running of Hami South grounding with 5000A mono-polar current flowing to the HVDC grounding. This numerical assessing is performed before the HVDC project put into use. The results show Hami South grounding should have negative impact on the nearest pipeline which is 35km away: the most positive P/S potential should be around +0.65V (CSE) due to poor soil conductivity. 5 months later this HVDC put into use meanwhile coutinuous P/S potential monitoring devices are installed on the potentially interfered pipeline section. The most positive P/S potential from monitoring devices is proven to be about +0.50V (CSE). The interference intense from numerical modeling+0.65V (CSE) meets the field monitoring result +0.50V (CSE) very well which proves necessity of numerical modeling in deal with HVDC interference related problems. Moreover 5 and 7 mitigating CP stations with recommended working current outputs are evaluated. The effectiveness of mitigating CP station method is proved by numerical modeling.Keywords: HVDC pipeline interference numerical modeling
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