Transmission line carrying capacity calculation method

Abstract

The invention relates to a method for calculating the ampacity of a power transmission line. The method includes the following steps: selecting two sections of wires of the same type and with the same degree of newness and oldness as reference wires from the power line, the two sections are in the same environmental meteorological parameters, and the directions are parallel. That is, in the same place of sunshine radiation, wind speed and wind direction; the altitudes of the two sections of wires are different; the two sections of wires are equipped with micro-meteorological monitoring devices and wire temperature monitoring devices, so that the two sections of measurement sample wires pass through the same current, through calculation The influence relationship between altitude and temperature rise is obtained, so as to revise the calculation formula of ampacity. Compared with the existing calculation methods, the method is more accurate and practical, has a wide range of applications, and greatly improves the universality of the current carrying capacity calculation.

Description

Technical field: [0001] The invention relates to a method for calculating the ampacity of a transmission line, and more particularly to a method for calculating the ampacity of a transmission line considering the influence of altitude. Background technique: [0002] In recent years, the pace of power development has been accelerating, the power load has been rising, and the power supply situation is severe. At the same time, with the large-scale intermittent new energy access and the randomness of the load, the uncertainty of the power flow has greatly increased. limited risk. The rapid increase of load makes some transmission lines approach or reach the thermal stability limit, which limits the current carrying capacity of transmission lines and affects the power supply capacity. From the perspective of sustainable development and environmental protection, in order to solve the contradiction between the continuous growth of demand for transmission capacity and the difficul...

AI Technical Summary

Problems solved by technology

In the "Code for Design of 110kV~750kV Overhead Transmission Lines", the convection heat dissipation adopts the calculation formula of wind speed and temperature as parameters, and the calculation is relatively simple. When calculating sunshine heat absorption, the specified sunshine intensity is used for calculation on sunny days, and radiation heat dissipation takes into account the radiation heat dissipation coefficient and temperature rise of conductors etc., did not consider the influence of the altitude factor on the temperature rise, so the calculated current carrying capacity of the power line has a certain deviation, which will lead to a large error in the predicted temperature of the wire of the line, thus affecting the judgment of the dispatching operator on the allowable current carrying capacity

Images