Optimal design method of ion current measurement device applicable to different voltage classes

Abstract

The invention discloses an optimal design method of an ion current measurement device applicable to different voltage classes. The optimal design method comprises the following steps of 1) calculatingan ion flow field around a wire in a DC power transmission line, and extracting ion current density nearby ground as a boundary condition of an ion current density measurement error analysis model; 2) building the ion current density measurement error analysis model according to a field-circuit coupling method; 3) selecting a sampling resistor of a Wilson plate in a measurement platform; and 4) simulating ion current density of the Wilson plates in different sizes around the wire in the DC power transmission line, analyzing influence of length, width and thickness of the Wilson plates on an ion current density measurement error, and building an ion current measurement device with the current voltage class according to the corresponding length, width and thickness of the Wilson plate whenthe error is minimum. With the ion current measurement device obtained by the design of the method, the accuracy of ion current measurement of the high-voltage DC power transmission line can be effectively improved.

Description

technical field [0001] The invention relates to an optimal design method of an ion current measuring device, in particular to an optimal design method suitable for ion current measuring devices of different voltage levels. Background technique [0002] HVDC transmission has great advantages in long-distance power transmission. However, when the electric field around the wire reaches a certain intensity, corona discharge will be generated around the wire, and when the transmission line is in normal operation, a certain amount of corona discharge is also allowed around the wire. The space charge generated by the corona migrates to form an ion flow field. At present, my country stipulates that the ion current density near the ground of ±800kV DC transmission line should not exceed 100nA / m 2 , so it is very important to measure the ion current density accurately. [0003] Wilson plate is currently widely used in the measurement of ionic current in HVDC transmission lines, but...

AI Technical Summary

Problems solved by technology

Due to the different voltage levels, the line selection, line laying method, and distribution of ion current density will be different when laying transmission lines. However, the Wilson plate of the same size is obviously no longer suitable for the ion flow field of different voltage levels. In order to improve the high voltage To improve the measurement accuracy of ionic current in DC transmission lines and reduce the measurement error of equipment, it is necessary to design an optimal design method for ionic current measurement devices suitable for different voltage levels

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