Thunder trip-out rate calculating method for distributing line
A technology of power distribution lines and calculation methods, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as uncertain effects, lack of lightning parameters, lack of lightning actual measurement data, etc., to achieve accurate data and accurate lightning tripping rate Effect
Inactive Publication Date: 2013-12-11
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0003] The standards, regulations and calculation methods that have been used in the lightning protection design of distribution networks generally lack practical lightning measurement data, and lightning activities are closely related to geographical conditions and climate, and the characteristics of lightning parameters in different regions and seasons may vary greatly. The traditional parameter selection method cannot comprehensively and scientifically reflect the lightning activities in a certain area
The lack of lightning parameters makes it very blind to implement lightning protection measures in the weak lightning protection section of the line. Its technical and economic efficiency is not high, and there is no difference in lightning protection calculations, which cannot reflect the lightning protection of specific lines in specific time periods. performance
In the lightning protection calculation and evaluation method, there is a lack of comprehensive and comprehensive consideration of the differences in lightning activities, environmental characteristics, and line structures in different sections along the line, and there is also a lack of accurate establishment of models for lightning discharge channels and insulator flashover processes. , the evaluation results cannot accurately reflect the risk of lightning strike faults on the line, nor can it determine the role of various factors affecting lightning flashover
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[0021] The following specific embodiments are further detailed descriptions of the present invention.
[0022] 1. Calculation method of direct lightning tripping rate
[0023] Direct lightning overvoltage is generated by thundercloud discharge hitting overhead lines. Due to the low insulation level and small phase distance of distribution lines, direct lightning is likely to cause multi-phase flashover.
[0024] When calculating the direct strike lightning tripping, the lightning falling within the lightning receiving surface of the line is regarded as direct strike lightning.
[0025] The lightning area S of a 100km long 10kV overhead line is:
[0026] S=100(b+4h c )
[0027] In the formula: b: the distance between two side conductors, generally taken as 0.001km;
[0028] h c : Conductor suspension height, generally taken as 0.01km;
[0029] Assuming that the annual number of lightning falls per square kilometer is A, A comes from the statistical data of the lightning l...
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The invention provides a thunder trip-out rate calculating method for a distributing line. According to the method, calculation is carried out according to thunderbolt statistical data of a thunder locating system, accurate paths of a distributing line corridor of a GIS system, classification of direct thunder and inductive thunder and region distributing line equipment technical levels, and correction is carried out according to the 10kV line operating standard, so that the thunder trip-out rate of a region distribution network is obtained to be the sum of the trip-out rate of the direct thunder and the trip-out rate of the inductive thunder. According to the method, statistic of all thunderbolt situations of the line corridor of the distributing line within the special time can be carried out according to the data of the two systems, the line technical equipment levels are combined, and a direct thunder model and an inductive thunder model of the distributing line are respectively set up for carrying out calculation, so that the line thunder trip-out probability is obtained. According to the method, the accurate thunder trip-out rate of the distribution network can be obtained, the accurate data can be provided for thunder-prevention assessment, and the method is suitable for calculating the thunder trip-out rate of the distributing line.
Description
technical field [0001] The present invention relates to a method for calculating the lightning tripping rate of a distribution line, in particular to a method based on the lightning statistics data of the lightning positioning system and the precise path of the distribution line corridor of the GIS system, which is combined with regional distribution line equipment according to the classification of direct lightning strikes and induced lightning The invention relates to a method for calculating the lightning tripping rate of a regional distribution network which is calculated according to the technical level and corrected according to the 10kV line operation regulations, etc., and belongs to the technical field of power line lightning protection. Background technique [0002] Lightning is one of the frequent natural disasters, which seriously affects the safe and stable operation of the power system. At present, lightning strikes are still the primary factor causing tripping...
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IPC IPC(8): G01R31/00
Inventor 郑蜀江章叔昌蔡木良安义
Owner STATE GRID CORP OF CHINA