Method for detecting maximum current-carrying capacity of transmission conductor of high-voltage transmission line

Abstract

The invention discloses a method for detecting maximum current-carrying capacity of a transmission conductor of a high-voltage transmission line. The method comprises the following steps of: 1) erecting a reference conductor nearby the transmission conductor, wherein the reference conductor and the transmission conductor are arranged in parallel with a certain interval, the diameter and surface conditions of the reference conductor are consistent with those of the transmission conductor, and the reference conductor and the transmission conductor are subjected to the same solar radiation; 2) loading current on the reference conductor to heat the reference conductor, measuring the current value Ij when the temperature reaches 70 DEG C, and transmitting the current value Ij to a substation; and 3) receiving the current value Ij through a main engine of the substation, and calculating the real-time maximum current-carrying capacity of the transmission conductor according to a current proportioning relationship between the transmission conductor and the reference conductor. According to the method, the ambient temperature and the irradiance are not required to be measured, and errors generated by a formula (5) and a formula (7) are avoided, so that the calculation result has high accuracy; and moreover, the maximum current-carrying capacity of the transmission conductor at the temperature of 70 DEG C is calculated, and the sag of the transmission conductor is guaranteed in a safety range.

Description

technical field [0001] The invention belongs to the field of transmission capacity measurement of high-voltage transmission lines, and in particular relates to a method for measuring the maximum current-carrying capacity that a transmission line can carry by using a reference line. technical background [0002] In recent years, with the continuous and rapid growth of my country's national economy and the continuous increase of electricity consumption, the bottleneck of power transmission capacity is very prominent, especially in economically developed areas, such as southern Jiangsu in East China, Shanghai, Zhejiang and other coastal areas. With the rapid increase of power capacity and demand for electricity, the increasing shortage of resources and energy, and the urgent requirements of environmental protection, it is necessary to build a large number of new power grid transmission lines or transform existing lines to greatly increase the power transmission capacity of the p...

AI Technical Summary

Problems solved by technology

[0015] However, when the load of the transmission line is light, the temperature T of the reference conductor r and wire temperature T c Very close, considering the measurement error of the temperature sensor, the calculation error of formula (5) will be very large, resulting in a large calculation error of formula (8)

In addition, formula (7) itself will introduce 3%~5% error

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