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DC magnetic biasing problem,caused by the DC grounding
electrode, threatened the safe operation of AC power grid. In this paper, the
characteristics of the soil stratification near DC grounding electrode was researched.
The AC-DC interconnected large-scale system model under the monopole operation
mode was established. The earth surface potential and DC current distribution
in various stations under the different surface thickness was calculated. Some
useful conclusions are drawn from the analyzed results.