T/CES 029-2019 Guidelines for assessing the risk of flashover of 10kV overhead power lines during lightning strikes

Scope

Scope: This guideline specifies the principles of risk level classification for lightning-induced tripping of 10kV overhead lines, assessment requirements, and methods of coarse-grained and fine-grained assessments. This guideline is applicable to the lightning protection design, operation, and transformation of 10kV overhead lines; Main technical content: Existing standards specify lightning hazard classification standards and risk level classification principles for lightning-induced tripping of transmission lines, the drawing of ground flash density distribution maps, and the drawing of lightning-induced tripping risk distribution maps for power grids with voltages of 220kV and above, but do not explain the risk level classification principles for lightning-induced tripping of 10kV overhead lines. Moreover, lightning-induced tripping of 10kV overhead lines is mainly due to induced lightning, while that of transmission lines is mainly due to direct lightning. The factors considered in risk level classification are different, so it is urgent to standardize the risk assessment of lightning-induced tripping of 10kV overhead lines, evaluate the technical and economic feasibility of high-lightning protection transformations, effectively assess the lightning protection performance of 10kV overhead lines, and ensure the safe operation of 10kV overhead lines. This standard, considering the technical and economic feasibility of lightning protection for distribution networks, conducts risk assessment of lightning-induced tripping of 10kV overhead lines, which generally includes the following elements: (1) Standardization of risk level classification criteria for lightning-induced tripping. (2) Standardization of risk assessment methods. This standard, based on the economic feasibility of lightning protection transformations for distribution networks and the improvement of their operation reliability, specifies the principles of risk level classification, assessment re

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