Lightning Shielding Failure Risk Assessment for Transmission Lines
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Solution Overview
Problem
Current methods for assessing lightning shielding failure risk in power transmission lines are inaccurate and do not consider crucial factors like altitude, terrain, and lightning strike angle, making it difficult to identify and mitigate tripping risks effectively.
Innovation Solution
A multi-dimensional analysis method that calculates the lightning shielding failure risk by extracting key parameters such as tower head size, insulation configuration, thunderstorm days, and ground wire protection angle, and applies these to determine a weighted tripping risk for the entire transmission line, considering terrain and altitude corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard methods are used to calculate lightning shielding failure probability, then the calculation process is simple, but the accuracy is low and large errors occur
Solution Approach 1:
The patent introduces multiple correction parameters including altitude correction factor Ka, terrain correction factor Kt, and lightning strike angle correction factor Kθ. These parameters modify the basic shielding failure probability calculation to account for environmental and geometric variations, thereby improving accuracy without requiring a complete reformulation of the calculation model.
Solution Approach 2:
The patent transitions from a two-dimensional protection angle model to a three-dimensional analysis by incorporating lightning strike angle θ and terrain inclination angle φ. This dimensional expansion allows for more realistic representation of lightning interaction with transmission lines in complex terrain conditions.
2Measurement precision
If analysis is performed for each tower on the whole transmission line, then comprehensive coverage is achieved, but the calculation amount becomes huge and is not feasible
Solution Approach 1:
The patent divides the transmission line into multiple sections based on terrain characteristics, tower types, and lightning activity zones. Each section is analyzed separately with appropriate correction factors, and results are aggregated to obtain the whole line tripping risk. This segmentation reduces the computational burden compared to analyzing every individual tower while maintaining comprehensive coverage.
Solution Approach 2:
The patent focuses analysis on critical sections of the transmission line that have higher vulnerability to lightning shielding failure, such as sections with unfavorable terrain, higher towers, or greater thunderstorm activity. By concentrating computational resources on these high-risk partial sections, the method achieves effective whole line assessment without the excessive calculation required for uniform analysis of all towers.
3Measurement precision
If comprehensive factors like altitude, terrain, and lightning strike angle are considered, then assessment accuracy improves, but data collection requirements increase and become more difficult
Solution Approach 1:
The patent uses correction factors as intermediary parameters that translate complex environmental conditions (altitude, terrain, strike angle) into modified probability values. Instead of directly measuring and modeling every environmental variable, the method employs these intermediary correction factors that can be derived from more easily obtainable data, thereby reducing measurement and data collection difficulties.
Data Source
AI summary
Disclosed is a multi-dimensional analysis method for a tripping risk of a whole transmission line due to a lightning shielding failure. A quantity of thunderstorm days, a tower size, a terrain proportion, an altitude, and insulation configuration data are collected for a transmission line for which a tripping risk due to a lightning shielding failure needs to be analyzed, and a striking distance, an exposure distance, a lightning resisting level of the line after altitude factor correction, and a lightning shielding failure risk of a single-base tower are calculated in turn. Characteristics of a lightning shielding failure under different nominal heights, quantities of thunderstorm days, and terrains are studied. Representative combination conditions are selected to calculate a tripping risk of a typical tower due to the lightning shielding failure. A weight coefficient is extracted, to calculate a tripping risk of the whole line due to the lightning shielding failure.