Comprehensive estimation method of natural disaster flashover risks of power transmission circuit

Abstract

The invention discloses a comprehensive estimation method of natural disaster flashover risks of a power transmission circuit. The method comprises steps of based on research on the models of lightening strokes, ice flashover l, pollution flashover and wind deviation flashover of the traditional power transmission circuit, calculating flashover probability of the power transmission circuit under the current natural disaster condition; determining load loss after the flashover faults of the circuit; and finally, taking the ratio of the load loss to the power utilization load of a power grid as a risk value and carrying out grading division, thereby achieving comprehensive estimation on different types of natural disaster flashover risks of the power transmission circuit. According to the invention, a unified and quantitative reference basis is provided for disaster prevention and reduction work of different types of natural disasters of the power transmission circuit.

Description

technical field [0001] The invention belongs to the field of disaster prevention and mitigation of power grids, and in particular relates to a comprehensive evaluation method for natural disaster flashover risks of power transmission lines. Background technique [0002] Transmission lines operating outdoors are exposed to the atmospheric environment for a long time, and are easily affected by natural disasters such as lightning strikes, icing, pollution, and strong winds, and the risk of tripping is relatively prominent. At present, domestic and foreign scholars have carried out a lot of research work on the assessment of transmission line flashover risk under the influence of different natural disasters. [0003] In the evaluation of lightning flashover, the procedure method, electrical geometric model or lightning leader development model are often used to analyze the lightning resistance performance of transmission line shielding; in the evaluation of ice flashover, the m...

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Problems solved by technology

[0004] However, the current flashover risk assessment of transmission lines is usually aimed at a single natural disaster, and the evaluation indicators used for the flashover risk of different natural disasters are inconsistent

For example, in the risk assessment process of lightning strike, ice flashover, pollution flashover and wind deflection flashover of transmission lines, the key research objects are lightning current amplitude, ice thickness, equivalent salt density, wind deflection gap, etc., and there is no unified The assessment model is suitable for the assessment of transmission line flashover risk under different natural disaster conditions

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