Method and device for drawing ice area distribution map of overhead transmission line

Abstract

The invention provides a method and device for drawing ice area distribution maps of overhead power transmission lines. The method includes: collecting ice-covered data of weather stations over the years with long series of ice-covered ice weight records in the area and other surveyed ice-covered data in the area; Design ice thickness for different return periods; fit and determine the ice spectrum and ice spectrum factor at the weather station; where, the ice spectrum is the design ice thickness B0 at the reference altitude corresponding to the ice spectrum factor, and the ice spectrum factor includes: reference altitude Height H0 and ice-covered altitude growth factor α; determine ice spectrum divisions based on climate divisions, distribution of long-series ice-covered observation weather stations, and line design and operation experience, and draw ice spectrum distribution maps; verify ice spectrum divisions based on survey ice-covering data; Ice spectrum factor and topographic map elevation in ice spectrum distribution map, calculate and design ice thickness distribution, and draw ice area map. The ice area map drawn by the method and device has clear principles, high accuracy and convenient use.

Description

technical field [0001] The invention relates to the technical field of power grid disaster prevention and mitigation, in particular to a method and device for drawing an ice area distribution map of an overhead power transmission line. Background technique [0002] With the construction of my country's power grid, especially the continuous development of ultra-long-distance UHV transmission lines, it is becoming more and more difficult to choose the route of overhead transmission lines, and more and more line projects are located in high mountains and ridges. , that is, the study of ice distribution maps is becoming more and more important for line planning, design, operation and maintenance, and is directly related to the safety and economy of the project. [0003] There are many factors considered in the drawing of ice areas in the existing ice area map, but the principle of determining the ice area in a specific area is not clear, there is a lot of subjective arbitrariness...

AI Technical Summary

Problems solved by technology

[0003] There are many factors considered in the existing ice area maps when drawing ice areas, but the principles for determining ice areas within a specific area are not clear, and there is a problem of high subjective arbitrariness and frequent revisions

Due to the complex factors affecting the ice area, the final display of the ice area on the existing ice area map is very messy. For areas with complex terrain, in order to ensure that the obtained ice area conforms to the ice area map, the accuracy of the geographical location of the line is required to be extremely high. inconvenient to use

Existing ice area maps try to include the influence of micro-topography and micro-meteorology, but the influence of micro-topography and micro-meteorology is related to factors such as line direction and map scale, and the range of influence on the design ice thickness is 0.5 to 3 times, making the ice area The credibility of the graph is reduced

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