Abstract
When DC transmission system adopts monopole earth or bipolar imbalance operation mode, the DC grounding electrode will inject large amount of current into the earth, and then disturb the running of the power grid. In view of the influence which is created by DC transmission system in Guangdong power grid, this paper derived the mathematical expressions of the transformer neutral point current after creating a calculation model, and concluded the main influence factors; The subject applied the linear regressing analysis theory to calculate the regression equations of transformers so that the slope of the regressing equation can be used to estimate the influence scope of grounding DC. Finally it concludes that: transformer neutral point current and the power transmitted by DC system has positive correlation; For ±800kV DC Chu Sui, the transformers ,which is more than 80 km away from DC grounding electrode, will no longer be affected; The application of DC suppression devices will affect the neutral point current of the transformers nearby.
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