Measurement method of charge densities at ground level under high-voltage direct current conductor


Ions generated by corona discharge of high-voltage direct current (HVDC) transmission lines exist in the area between conductors and the ground. Electrical field strength, ion current density, and space charge density are important electromagnetic setting parameters of HVDC transmission lines. To measure the charge densities at ground level below the HVDC power lines, an aspirator-sort charge meter is designed and utilised. The charge meter is calibrated within the ionised field generated by parallel metal mesh and plate. Charge densities on the ground below the unipolar HVDC conductor are measured by the calibrated devices within the laboratory. Experimental results show that cheap agreement between measured data by the devices and the ones by field mills and ion current plates may be obtained, that establishes a foundation to analysis the charge characteristics of ions near the bottom.

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