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A field-circuit combined distribution line induced lightning overvoltage calculation method

A technology that combines distribution lines and field circuits. It is used in the measurement of current/voltage, calculation, and measurement of electrical variables, and can solve problems such as slow development.

Active Publication Date: 2019-05-03
STATE GRID HUBEI ELECTRIC POWER RES INST +3
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Problems solved by technology

In addition, further observations on the electric field generated by lightning current in recent years have shown that when the observation point is closer to the lightning current channel, the leading process before each return strike process will also generate a larger electric field, and then produce an obvious lightning induction on the line Overvoltage, but the leading process here is not the same concept as the leading process that occurred before the entire lightning strike process mentioned above, and the development speed is only about 10 times slower than the return process

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  • A field-circuit combined distribution line induced lightning overvoltage calculation method
  • A field-circuit combined distribution line induced lightning overvoltage calculation method
  • A field-circuit combined distribution line induced lightning overvoltage calculation method

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[0070] The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0071] The method for calculating the induced lightning overvoltage of the distribution line proposed by the present invention mainly includes two parts, the space electromagnetic field calculation based on the lightning current return stroke model and the FDTD solution of the Agrawal field line coupling model, including the following steps:

[0072] (1) Determine the waveform of the return stroke current at the bottom of the lightning current channel used. In the actual measurement, under the existing technical conditions, it is only possible to measure the return lightning current waveform at the bottom of the lightning channel. Therefore, in the existing lightning current return engineering model, the calculation of the temporal and spatial distribution of the return lightning current is based on the ...

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Abstract

The invention provides a field-circuit combined distribution line induced lightning overvoltage calculation method. The method comprises the following steps: utilizing a lightning return stroke modeland a Cooray-Rubinstein formula to calculatie a space electromagnetic field generated by the lightning stroke in the space; furthermore, by considering the Agrawal field line coupling model and adopting the FDTD method to calculate and obtain the induced lightning overvoltage of the power distribution line, the calculation speed is increased, and the influence of non-ideal ground, a pilot processand a corona phenomenon is considered, so that the method can be better applied to practical engineering.

Description

technical field [0001] The invention relates to the field of lightning protection for power distribution lines, in particular to a method for calculating the induced lightning overvoltage of power distribution lines combined with field and circuit. Background technique [0002] Most of the transmission lines and distribution lines of my country's power system use overhead lines to transmit electric energy, which is very vulnerable to lightning strikes, which will cause power interruptions, damage power supply equipment and household appliances. For distribution networks with voltage levels ranging from 6kV to 35kV, there is generally no ground wire protection and the line insulation level is low. In addition, the network structure is also intricate. Therefore, not only direct lightning strikes can cause lightning accidents, but also induced lightning can cause greater damage. According to the investigation of the operation of the power supply department, in the power distrib...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/11G01R19/165
CPCY02E60/00
Inventor 姚尧傅景伟殷禹庄池杰李小平程建翼雷挺杨志淳沈海滨蔡超安建伟
Owner STATE GRID HUBEI ELECTRIC POWER RES INST
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