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

A technology of ion current and measuring device, which is applied in the direction of measuring device, current density measurement, current only measurement, etc., to achieve the effect of improving accuracy

Active Publication Date: 2019-11-29
XI AN JIAOTONG UNIV
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  • Application Information

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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 level

Method used

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

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Embodiment Construction

[0033] The present invention is described in further detail below in conjunction with accompanying drawing:

[0034] At present, most of the high-voltage direct current transmission lines are positive and negative 800kV direct current transmission lines. The present invention takes the transmission lines of this voltage level as an example, and the specific operation process is as follows:

[0035] 1) Calculate the ion flow field around the wire in the positive and negative 800kV DC transmission line, and extract the ion current density near the ground as the boundary condition of the ion current error analysis model;

[0036] The HVDC transmission line model is established by numerical calculation methods, such as finite element iteration method and upstream finite element method, to calculate the ion flow field distribution around the transmission line, and to extract the ion current density near the ground.

[0037] The governing equation of the ion flow field is:

[0038]...

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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...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R19/08G01R15/00
CPCG01R15/002G01R19/0092G01R19/08
Inventor 朱婷王曙鸿王烁裕张那明牛雨枫
Owner XI AN JIAOTONG UNIV
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