Method for Determining Power Frequency Electric Field of Undulating Ground Overhead Transmission Line Based on Simulated Charge Method

Abstract

A method for determining the power frequency electric field of the undulating ground overhead transmission line based on the analog charge method provided by the present invention comprises the following steps: a. Selecting the mirror image ground, and assuming that the mirror image ground extends into the undulating ground; b. Set the analog charge and the matching point corresponding to the analog charge on the mirror image, so that the potential of the undulating ground is 0; c. According to the superposition principle, construct the analog charge equation group, and solve the size of the analog charge according to the equation group of the analog charge; d . Calculate the power frequency electric field distribution on the undulating ground according to the size of the simulated charge. Based on the mirror image principle and combined with the optimized simulated charge method, the present invention can calculate the electric field distribution of the complex terrain that the overhead conductor line passes through, effectively overcoming the traditional method. For the technical problem that the electric field distribution of the undulating terrain cannot be accurately calculated, the accuracy of the calculation of the power frequency electric field of the conductor line is greatly improved, and the difficulty of calculation is greatly reduced, the amount of calculation is reduced, the calculation accuracy is further improved, and the electric field is enhanced. Applicability of calculation methods.

Description

technical field [0001] The invention relates to an electric field calculation method, in particular to a method for determining the power frequency electric field of an undulating ground overhead transmission line based on an analog charge method. Background technique [0002] With the continuous development of my country's economy and the continuous improvement of people's living standards, the demand for electricity has grown rapidly, and the scale and capacity of the power grid have continued to increase. In order to reduce transmission corridors and improve line transmission capacity, the development of high-voltage AC conductor lines has become an inevitable choice. [0003] The electromagnetic environment will be affected by the high-voltage AC conductor line during its operation. At present, the calculation of the power frequency electric field at home and abroad generally adopts the equivalent charge method recommended by the 36.01 working group of the International ...

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Problems solved by technology

[0003] The electromagnetic environment will be affected by the high-voltage AC conductor line during its operation. At present, the calculation of the power frequency electric field at home and abroad generally adopts the equivalent charge method recommended by the 36.01 working group of the International Large-scale Power Grid Conference, and it is mainly aimed at the fact that the ground is an ideal flat ground. carried out, ignoring the influence of the ground on the power frequency electric field

However, in the actual erection process of high-voltage conductor lines, there is no absolute ideal level ground, and the field test for this situation shows that the undulating ground has a non-negligible influence on the power frequency electric field distribution

At present, the calculation of the power-frequency electric field of the high-voltage overhead conductor line is based on the ideal flat ground, which causes a large error in the calculation of the power-frequency electric field of the conductor line, making the calculation results lack of reference, and when considering the terrain, it needs to be under the line A large number of simulated charges and matching points are set on all surfaces in the calculation area, lack of optimization process, and heavy calculation workload, which still makes the accuracy not guaranteed

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