Fig 1.
Monopole ground return mode of HVDC projects.
Fig 2.
The resistive network above the ground and the electric field under the ground.
Fig 3.
The DC currents calculation algorithm.
Fig 4.
The earth resistive network mesh.
Fig 5.
Partial structure of the earth resistive network.
Fig 6.
The comparison of ground surface potentials for double ring ground electrodes and point.
Fig 7.
Shanghai area earth structure.
Table 1.
Resistivity of different parts of Shanghai area.
Fig 8.
Shanghai area power grid diagram and the positions of the main 500 kV substations and the converter stations.
Table 2.
The calculated and measured DC current for 500 kV substation #02 and #10.
Table 3.
Computer configuration and calculation time.
Table 4.
DC currents in main AC substations for various polarity combinations of HVDC lines.
Table 5.
Substation #10 connection combinations.
Table 6.
The DC currents in 500 kV substations under different connection combinations of Substation #10.
Table 7.
The DC currents in part 220 kV substations under different connection combinations of Substation #10.