Lightning strike flashing and non-flashing identification method based on 110kV same tower double-circuit transmission line

A technology of double circuits on the same tower, transmission line, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength, etc., to achieve the effect of simplifying the judgment process, true and reliable judgment results, and sufficient and reliable test data

Inactive Publication Date: 2019-03-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Today's research on the identification of lightning strike properties is mostly focused on single-circuit lines, and there

Method used

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  • Lightning strike flashing and non-flashing identification method based on 110kV same tower double-circuit transmission line
  • Lightning strike flashing and non-flashing identification method based on 110kV same tower double-circuit transmission line
  • Lightning strike flashing and non-flashing identification method based on 110kV same tower double-circuit transmission line

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0076] Example 1: Such as Figure 2-4 Shown, using figure 1 The simulation model established in is used for lightning discrimination simulation. A lightning strike occurred 23km away from the measuring end. According to the above steps, first collect the zero-mode current waveforms of circuit I and II at the measuring terminal. Figure II versus Figure three Shown.

[0077] Select the zero-mode current waveform of the Ⅰ and Ⅱ circuits in the short-time window to calculate the zero-mode current in the same direction according to formula (3), and perform linear simulation of the zero-mode current waveform in the same direction in the short-time window according to formulas (4) and (5). The result after fitting is as Figure Four , And calculated by:

[0078] k=-0.00026552

[0079] b=-0.30633

[0080] The function of the line after fitting is:

[0081] y=-0.00026552x-0.30633

[0082] Then the absolute value of the slope of the line after fitting |k| is:

[0083] |k|=0.00026552=2.6552×10...

Example Embodiment

[0085] Example 2: Such as Figure 5-7 Shown, using figure 1 The simulation model established in to simulate lightning strikes at 46km from the measuring end. According to the above steps, first collect the zero-mode current waveforms of circuit I and II at the measuring terminal, such as Figure 5 versus Figure Six Shown.

[0086] Select the zero-mode current waveform of the Ⅰ and Ⅱ circuits in the short-time window to calculate the zero-mode current in the same direction according to formula (3), and perform linear simulation of the zero-mode current waveform in the same direction in the short-time window according to formulas (4) and (5). The result after fitting is as Figure Seven , And calculated by:

[0087] k=-1.5571×10 -8

[0088] b=-3.5083×10 -5

[0089] The function of the line after fitting is:

[0090] y=-1.5571×10 -8 x--3.5083×10 -5

[0091] Then the absolute value of the slope of the line after fitting |k| is:

[0092] |k|=1.5571×10 -8 =0.00015571×10 -4

[0093] Pass and...

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Abstract

The invention relates to a lightning strike flashing and non-flashing identification method based on a 110kV same tower double-circuit transmission line, and belongs to the technical field of power system relay protection. When the line is struck by lightning, the three-phase current of the III-circuit line is separately collected at a bus-line measuring point, a same-direction zero-mode current waveform in a short-time window is obtained, a straight line fitting method in unitary linear regression is used for judging the development trend of the same-direction zero-mode current waveform in the short-time window, the gradient of the fitted straight line is obtained, the comparison between the absolute value |k| of the gradient of the straight line after fitting and the threshold to determine whether the line has flashover, in the case of considering the simulating experimental errors, a criterion threshold of lightning flashover and non-flashover is set, when k is less than 0.8*10-4, it is judged that the lightning strike does not flashover, and when the k is greater than or equal to 0.8*10-4, it is judged that the lightning strike flashovers.

Description

technical field [0001] The invention relates to a lightning flashover and non-flashout identification method based on a 110kV double-circuit transmission line on the same tower, and belongs to the technical field of electric power system relay protection. Background technique [0002] How to effectively ensure the stable operation of transmission lines has always been one of the hot topics studied by scholars at home and abroad. Years of experience in line operation in my country and relevant data show that the line tripping faults directly or indirectly caused by lightning in transmission line routes in my country account for about 40-70% of the total. Especially for the Yunnan area, because it is located in the Yunnan-Guizhou Plateau and has the characteristics of various climate forms, it is an area with frequent thunderstorms, and the faults caused by lightning on transmission lines are relatively frequent. According to the data of a research institute in Yunnan Provinc...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/00
CPCG01R31/00G01R31/12
Inventor 束洪春徐泽奇邱大林张瑀明
Owner KUNMING UNIV OF SCI & TECH
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