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Voltage integral method based segmentation fitting method for calculating volt-time characteristic curve

A technology of voltage integration method and volt-second characteristic, which can be used in computing, electrical digital data processing, special data processing applications, etc., and can solve problems such as inaccurate flashover breakdown characteristics of insulators

Inactive Publication Date: 2015-12-23
SOUTH CHINA UNIV OF TECH +1
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Problems solved by technology

This kind of judgment is simple, but it is not suitable for various lightning waveforms, and it is easy to ignore the overvoltage waveform that breaks down at the wave tail, so the obtained insulator flashover breakdown characteristics are not accurate

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  • Voltage integral method based segmentation fitting method for calculating volt-time characteristic curve
  • Voltage integral method based segmentation fitting method for calculating volt-time characteristic curve
  • Voltage integral method based segmentation fitting method for calculating volt-time characteristic curve

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with specific examples.

[0063] The segmental fitting method based on the voltage integration method of the present invention to calculate the volt-second characteristic curve comprises the following steps:

[0064] 1) Select a specific insulator string and obtain the experimental data of its standard volt-second characteristics. According to the data, analyze the parameter selection of the voltage integration method, as follows:

[0065] D E = ∫ t 0 t P ( U ( t ) - k 2 ) k 1 d t - - - ...

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Abstract

The invention discloses a voltage integral method based segmentation fitting method for calculating a volt-time characteristic curve. The method comprises: by adopting a voltage integral method as an insulator flashover criterion, segmentally calculating the volt-time characteristic curve of an insulator string in a non-standard waveform in combination with a numerical analysis method, and performing continuous correction. The obtained lightning impulse volt-time characteristic theoretical calculation curve of the insulator string is most relevant to a volt-time characteristic curve fitted by lightning impulse test data of an actual test. The flashover characteristic of the insulator string determines lightning withstand level of a power transmission line, and the situation that actual line flashover rate is not consistent with theoretical calculation data is caused if the influence of lightning waveform change on 50% discharge voltage of an insulator gap is not considered. Therefore, the flashover voltage of the insulator string under the action of an actual lightning waveform can be obtained in combination with the numerical analysis method by selecting the voltage integral method as the flashover criterion, and a theoretical reference is provided for an electric power department to accurately evaluate the lightning withstand level of the line.

Description

technical field [0001] The invention relates to the technical field of lightning protection simulation calculation for transmission lines, in particular to a segmental fitting method for calculating a volt-second characteristic curve based on a voltage integral method. Background technique [0002] At present, in the lightning protection simulation calculation of transmission lines, the flashover criterion of insulator strings under lightning impact can be divided into two categories, one is based on the conclusion of insulation breakdown, and by comparing the voltage waveform or voltage value at both ends To judge whether the insulator string is flashover, such methods include the rule method and the intersection method; the other method starts from the physical mechanism of insulation breakdown, and judges whether the insulation is broken down by analyzing the breakdown process. This kind of method has the voltage integration method and pilot method. Details are as follow...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 刘刚周露梁嘉浩
Owner SOUTH CHINA UNIV OF TECH
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