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| Corrosion Monitoring Technology of High Silicon Ferrochrome High-voltage DC Grounding Electrode and Experimental Study on Coke Layer Filling |
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| DOI：10.7643/issn.1672-9242.2022.11.016 |
| KeyWord:HVDC transmission high-silicon ferrochrome ground electrode cokepacking corrosion monitoring |
| Author | Institution |
| LI Wei |
Electric Power Research Institute of State Grid Shaanxi Electric Power Co., Ltd., Xi'an , China |
| GUO Zi-hao |
Electric Power Research Institute of State Grid Shaanxi Electric Power Co., Ltd., Xi'an , China |
| WANG Rong |
Ultra-high Voltage Company of State Grid Shaanxi Electric Power Co., Ltd., Xi'an , China |
| LI Song |
State Grid Shaanxi Electric Power Co., Ltd., Xi'an , China |
| WANG Xi-xiang |
Shaanxi Pilot Power Technology Co., Ltd., Xi'an , China |
| ZHANG Jian-yang |
Wuhan Kesite Instrument Co., Ltd, Wuhan , China |
| DONG Ze-hua |
Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan , China |
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| Abstract: |
| This paperaims tograsp the operation parameters and corrosion status of HVDC grounding electrode during service, including the temperature and humidity of surrounding soil during the operation of grounding electrode, the corrosion rate and total corrosion amount of feed elements, etc. Using the precision resistance probe corrosion monitoring technology and weight loss method, the soil temperature rise and grounding electrode corrosion of high silicon ferrochrome DC grounding electrode with and without coke filler during the strong DC test were compared. Based on the resistance probe technology, the total corrosion amount and corrosion rate of the feed element can be accurately measured during the power on process. On the contrary, due to the limitation of the electrochemical polarization principle, the electrochemical monitoring technology is difficult to measure the corrosion of the feed element under the power on state. The filled coke coating can effectively delay the DC corrosion of high silicon ferrochrome and reduce the corrosion rate by 96%. This is mainly attributed to the fact that after the high silicon ferrochrome surface is coated with coke layer, the electrolytic reaction transits from the high silicon ferrochrome/soil layer interface to the coke layer/soil interface, thus playing a better role in protecting the high silicon ferrochrome. |
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