Evaluation method for insulator icing flashover risk of ultrahigh voltage alternating-current transmission line

Abstract

The invention discloses an evaluation method for an insulator icing flashover risk of an ultrahigh voltage alternating-current transmission line. The method comprises: S1, carrying out meteorological and line basic data collection; S2, carrying out determination of an insulator icing flashover initial condition; S3, carrying out insulator icing flashover voltage calculation; and S4, carrying out insulator icing flashover risk evaluation. According to the invention, on the basis of the real-time meteorological data, an insulator icing flashover risk is evaluated by combining basic data of the ultrahigh voltage alternating-current transmission line and the powerful guidance can be provided for disaster prevention and reduction of the power grid operation management department. The method can be realized simply with high feasibility; and the prediction result has the high reference value.

Description

technical field [0001] The invention belongs to the field of disaster prevention and mitigation of power grids, and in particular relates to a risk assessment method for ice-covered flashover of insulators of UHV AC transmission lines. Background technique [0002] UHV transmission has the advantages of large transmission capacity, long transmission distance, and high transmission efficiency. It has become the main power transmission method in my country to alleviate problems such as unbalanced distribution of energy bases and load centers, increasing transmission capacity, and increasingly tight line corridors. During the "Twelfth Five-Year Plan" period, the State Grid Corporation invested 500 billion yuan, 40,000 kilometers of UHV transmission lines have been built and are under construction, and the transmission capacity is 430 million kVA. Networked energy allocation pattern. During the construction of UHV transmission lines, due to the increasingly tense line corridors...

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Problems solved by technology

However, there is little historical data on ice flash on UHV transmission lines, the risk assessment model established therefrom is not representative, and the error of the evaluation results is also large; in addition, there is a lack of online monitoring devices for icing on UHV transmission lines, However, the UHV line used as the backbone grid frame for power transmission in the power grid cannot be powered off to install the ice-covered online monitoring device, and the electromagnetic environment of the UHV AC transmission line is harsh, which requires high requirements for the normal operation and data communication of the online monitoring device. It is difficult to realize the icing flashover risk assessment method based on online monitoring information

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