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Study on Galvanic Corrosion Characteristics of the Ground Grid with Different Metal Conductors in the Converter Station
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Study on Galvanic Corrosion Characteristics of the Ground Grid with Different Metal Conductors in the Converter Station
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Journal Article
Study on Galvanic Corrosion Characteristics of the Ground Grid with Different Metal Conductors in the Converter Station
2022
Overview
The galvanic corrosion of grounding net in converter station seriously affects its dispersion performance. However, the corrosion potential difference between different metal conductors will aggravate the corrosion speed of the converter station grounding network. In this paper, the variation of corrosion potential difference and corrosion current of dissimilar metals in water medium and soil medium is analyzed by experiments. In the two media, when the circuit resistance is high, the galvanic corrosion is mainly affected by ohmic polarization. Then, CDEGS simulation was used to obtain the change rule of corrosion current under different circuit resistance, and the simulation results are compared with the experimental results. The results show that with the increase of circuit resistance, the corrosion potential difference is basically unchanged, while the corrosion current decreases gradually, and when the circuit resistance increases to a certain margin, the corrosion current decreases gently. When the current density is less than 0.47A/m 2 , ohmic polarization can be used to approximate analyze the galvanic corrosion of dissimilar metal connections.
Publisher
IOP Publishing
