Electric power line lightning protection performance estimation method based on thunder and lightning parametric statistics
A technology for transmission lines and lightning parameters, which is applied in the direction of measuring electricity, measuring electric variables, measuring devices, etc., can solve the problems of multi-parameter optimization, inability to evaluate the substantial difference and difference of lightning protection performance of transmission lines, etc., to improve lightning protection performance , The evaluation results are true and reliable, and the effect of refined management of the power grid
Active Publication Date: 2008-12-03
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology
This method is proposed to overcome the inability of the transmission line lightning protection judgment method to carry out full line simulation and the lack of multi-parameter optimization.
Its shortcomings are that it does not take into account the temporal and spatial differentiation characteristics of each lightning parameter, cannot evaluate the substantial difference in the lightning protection performance of transmission lines in time, and cannot reflect the lightning protection performance of each tower due to different lightning parameters. s difference
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[0021] Below, the present invention will be further described in conjunction with the accompanying drawings.
[0022] like figure 1 As shown, the lightning protection performance evaluation method for transmission lines based on lightning parameter statistics proposed by the present invention, in implementation, specifically adopts the following steps:
[0023] (1) Input of transmission line information
[0024] The information of the transmission line that needs to be evaluated for lightning protection performance is given, including the basic information of the line (line name, affiliation unit, voltage level, total length of the line), geographical information of the line (latitude and longitude coordinates of towers at all levels, altitude), line structure Features (type and geometric dimensions of towers, wires, and ground wires), line insulation features (flashover voltage or volt-second characteristics of insulator strings or shortest air gaps, grounding resistance of ...
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The invention relates to a method for evaluating the lightning protection performance of transmission lines based on the parametric statistics of lightning. The method comprises the following basic steps: firstly, the information of the transmission lines which require the lightning protection performance evaluation is given; secondly, the ground flash density and the probability distribution statistics of the lightning current magnitude within a specified period are performed to the given transmission lines; thirdly, the lightning-stroke trip-out rate in each section of the transmission lines segmented according to a pole tower within the specified period is calculated; fourthly, a reference value is set according to a design value, a specified value or an operation experience value of the lightning-stroke trip-out rate, and the time difference and the space difference of the lightning protection performance of the transmission lines are evaluated according to the lightning-stroke trip-out rate of each section of the transmission lines and a whole line within the specified period, wherein the lightning-stroke trip-out rate is obtained through the calculation in the step three. The method has the advantages that the evaluation to the lightning protection performance of the transmission lines is performed on the basis of the parametric statistics of lightning with time and space differences; the evaluation result of the method to the lightning protection performance of the transmission lines is more reliable, and has more pertinence; and the evaluation to the lightning protection performance of the transmission lines on different times and different spaces is realized.
Description
technical field [0001] The invention relates to the field of power grid lightning protection, in particular to a lightning protection performance evaluation method for transmission lines based on lightning parameter statistics, which is suitable for lightning protection performance evaluation of high-voltage, ultra-high voltage and extra-high voltage overhead transmission lines in power systems. Background technique [0002] At present, lightning accidents in the power grid are becoming more and more serious, and have become the first major factor threatening the safe and stable operation of the power grid besides natural disasters. The lightning protection performance evaluation of transmission lines has been highly valued by power grid operators. As far as the applicant knows, the lightning protection performance evaluation of transmission lines is an important technical means to guide the lightning protection design of transmission lines, master the lightning protection pe...
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IPC IPC(8): G01R31/00
Inventor 谷山强陈家宏李晓岚童雪芳张勤贺恒鑫张瑞
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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