Method for researching electric field shielding of power transmission line based on tree electrical characteristics

A transmission line and electric field shielding technology, applied in the fields of electromagnetic field characteristics, measuring resistance/reactance/impedance, measuring electric variables, etc., can solve the problem of inability to obtain electric field strength, tree resistivity and dielectric constant modeling and simulation, and inability to locate electric field strength maximum value etc.

Inactive Publication Date: 2020-06-12
NORTHEAST AGRICULTURAL UNIVERSITY
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Problems solved by technology

These researches all draw conclusions directly from the actual measured data, or the conclusions are calculated by some method, they are not combined with the actual measured tree resistivity and permittivity modeling and simulation, and can not get any point around the tree. Electric field strength, also can not locate and get the maximum value of electric field strength, there are certain limitations

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  • Method for researching electric field shielding of power transmission line based on tree electrical characteristics
  • Method for researching electric field shielding of power transmission line based on tree electrical characteristics
  • Method for researching electric field shielding of power transmission line based on tree electrical characteristics

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specific Embodiment approach 1

[0019] Specific implementation method 1: Select Xing’an larch and poplar as the research objects, use the PICUS tree electrical impedance tomography instrument to measure the resistivity at different heights of the trees, and use the HI-3604 power frequency electromagnetic field measuring instrument to measure the electrical resistivity around the two trees under the transmission line Electric field strength, combined with the measurement results of tree resistivity to establish a model, using finite element analysis software to calculate the electric field strength around the trees, and verifying and comparing the calculation results with the actual measurement data.

specific Embodiment approach 2

[0020] Specific implementation mode two: select coniferous forest and broad-leaved forest two different tree species, through field measurement and finite element modeling and simulation methods, analyze the situation of electric field intensity with trees and power lines In the case of distance changes, the weakening effect of trees on the electric field is explained, and the rationality of using the finite element method to study the influence of trees on the electric field under high-voltage transmission lines is demonstrated.

specific Embodiment approach 3

[0021] Specific implementation mode three: PICUS tree electrical impedance tomography is used to measure tree resistivity. PICUS tree electrical impedance tomography is a tree electrical impedance detection instrument developed based on electrical tomography (ERT) technology. The working method of electrical resistance tomography (ERT) technology is current excitation and voltage measurement. The alternating current is applied to the measured standing tree through a pair of electrodes. When the resistivity distribution in the standing tree changes, the distribution of the current field will change accordingly. The measured voltage on the periphery of the standing tree also changes. The change of the measured voltage on the periphery of the standing tree reflects the change of resistance. According to the measured voltage on the periphery of the standing tree, through a certain imaging algorithm, the resistivity distribution of the tree section can be reconstructed. The measureme...

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Abstract

The invention relates to comprehensive and deep understanding of the shielding effect of trees on an electric field of a power transmission line so as to prevent high electromagnetic radiation from harming a human body. The method comprises the following steps: selecting Xing'an larch and poplar as research objects to measure the resistivity of the tree at different heights by using a PiCUS tree electrical impedance tomography imaging instrument; using an HI-3604 power frequency electromagnetic field measuring instrument for measuring the electric field intensity around two trees under a powertransmission line; and establishing a model in combination with the measurement result of the trees resistivity, calculating the electric field intensity around the trees by using finite element analysis software, and verifying and comparing the calculation result with actual measurement data, so that the feasibility of finite element method analysis is demonstrated.

Description

technical field [0001] The invention belongs to the field of electric field shielding of transmission lines, and relates to a research method for electric field shielding of transmission lines based on the electrical characteristics of trees Background technique [0002] With the rapid development of my country's economy and industrialization, large-scale buildings have increased, and urban electricity consumption has increased. At present, my country's power grid structure can no longer meet the power supply required by the rapid development of my country's national economy, and there is an urgent need to establish more power transmission systems. However, some power grids need to pass through areas with dense vegetation and residential areas. Recent studies have found that the power frequency electric field under the transmission line will have a certain negative effect on the nervous system of residents and affect the health of residents. Guo Jianfeng et al. studied the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/08G01R27/02G01N27/04
CPCG01N27/041G01R27/02G01R29/0835
Inventor 曲惠泽
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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