System for measuring and calculating dynamic transmission capacity of high voltage transmission line and method thereof

Abstract

A system for measuring and calculating dynamic transmission capacity of a high voltage transmission line comprises: a reference lead, which is arranged around a transmission line and whose direction is parallel to the transmission line, wherein the reference lead and the transmission line are respectively provided with temperature sensors and connected with wireless sending modules, the each temperature sensor measures temperatures of the reference lead and the transmission line at a certain time interval and the each wireless sending module emits the temperatures; a computer, which accepts data and carries out calculation so as to acquire real time allowable current-carrying capacity of the lead. In the invention, sunshine radiation can be substituted and the allowable current-carrying capacity of the transmission line can be calculated without using a sunshine radiation sensor. A transient thermal equilibrium formula equation is used to solve a heat transfer coefficient. And a steady heat balance equation is used to calculate the real time allowable current-carrying capacity of the transmission line based on the heat transfer coefficient. In the invention, operation is simple, labor intensity is small, the sunshine radiation sensor is not needed and costs can be reduced.

Description

technical field [0001] The invention belongs to the field of calculation of transmission capacity of high-voltage transmission lines, and relates to a measurement and calculation system for measuring and calculating the allowable carrying capacity of high-voltage transmission lines by using a reference wire and a temperature sensor. The invention also relates to a measurement and calculation method using the above-mentioned system. Background technique [0002] In recent years, with the sustained and rapid growth of my country's national economy and the continuous increase in electricity consumption, the bottleneck problem of power transmission capacity is very prominent, especially in economically developed areas, such as southern Jiangsu, Shanghai, and Zhejiang coastal areas in East China. The sharp increase in capacity and electricity demand, the increasing shortage of resources and energy, and the urgent requirements of environmental protection require a large number of ne...

AI Technical Summary

Problems solved by technology

However, because its sensing module is independent, it will occupy the space of the entire measurement equipment and increase power consumption; when encountering low power consumption and small space, the difficulty of its implementation will increase.

In addition, this method has a great dependence on the solar radiation sensor. When a foreign object blocks the solar radiation sensor, the measured value will not conform to the actual situation, which will lead to the deviation of the entire calculation result.

What's more, when encountering lightning damage or component failure, its measurement will stop immediately, affecting the calculation of the entire allowable current carrying capacity

After the fault damage occurs, it is necessary to replace the solar radiation sensor on site, which increases the cost of its maintenance.

[0006] In addition, the solar radiation is calculated using information such as the geographical location of the wire and the time of the season. When encountering rainy days, the measurement results are inaccurate, which affects the subsequent calculation of the allowable carrying capacity.

Using an independent solar radiation sensor to measure, due to the large distance spanned by a whole transmission line, if the solar radiation sensor is only installed in one place, the determination of the solar radiation information will be too arbitrary; Installing a solar radiation sensor may cause cost problems, and when it is blocked, or even damaged by lightning strikes or component failures, it needs to be repaired and replaced, which increases the cost

Images