Method and device for detecting current-carrying capacity of overhead transmission line

A technique for overhead transmission lines and overhead transmission lines, applied in the field of electric power, which can solve the problems of low measurement accuracy and large detection error of ampacity of overhead transmission lines, and achieve the effects of accurate ampacity, low implementation difficulty and high reliability

Pending Publication Date: 2021-02-09
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Application Information

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Problems solved by technology

[0005] This application provides a method and device for detecting the ampacity of overhead transmission lines, which are used to solve the technical problem of low measurement ac

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  • Method and device for detecting current-carrying capacity of overhead transmission line
  • Method and device for detecting current-carrying capacity of overhead transmission line
  • Method and device for detecting current-carrying capacity of overhead transmission line

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Embodiment 1

[0038] see figure 1 , Embodiment 1 of a method for detecting the current carrying capacity of an overhead transmission line provided in the embodiment of the present application includes:

[0039] Step 101. Set the metal sphere in the same air environment as the overhead transmission line. When the overhead transmission line is in normal operation, keep the metal sphere in a stable temperature state and obtain the temperature of the metal sphere. The material of the metal sphere is the same as that of the overhead transmission line.

[0040] It should be noted that, in order to ensure that the environmental factors such as the ambient temperature of the metal sphere and the overhead transmission line are the same, the metal sphere is set in the same air environment as the overhead transmission line. Since the temperature of the overhead transmission line is in a stable state during normal operation, in order to pass The metal sphere indirectly reflects the convective heat tran...

Embodiment 2

[0059] see figure 2 , Embodiment 2 of a method for detecting the ampacity of an overhead transmission line provided in the embodiment of the present application includes:

[0060] Step 201, setting the aluminum ball in the same air environment as the overhead power line, when the overhead power line is running normally, heat the aluminum ball through the heating resistance wire, so that the temperature of the aluminum ball is in a stable state, and obtain the temperature of the aluminum ball, The material of the aluminum ball is the same as that of the overhead power line.

[0061] It should be noted that since the thermal conductivity of aluminum balls is better, and the material of overhead transmission lines is mostly aluminum, the metal balls are set as aluminum balls; and in this embodiment, the constant heat source is set as heating resistance wire to heat the aluminum balls , to keep the aluminum ball in a stable temperature state, and it is relatively simple and reli...

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Abstract

The invention discloses a method and a device for detecting the current-carrying capacity of an overhead transmission line. The method comprises the following steps: setting a metal ball body at a position in the same air environment as the overhead transmission line, enabling the metal ball body to be in a temperature steady state when the overhead transmission line operates normally, and obtaining the temperature of the metal ball body, wherein the metal ball is made of the same material as an overhead transmission line; based on the heat balance equation of the metal ball, calculating the heat exchange coefficient of the metal ball according to the temperature of the metal ball; obtaining the Reynolds number of the metal ball according to the relationship between the Nusselt number andthe heat transfer coefficient, substituting the Reynolds number of the metal ball into a Reynolds number relationship formula, and calculating to obtain the Reynolds number of the overhead transmission line; and calculating the current-carrying capacity of the overhead power transmission line according to the Reynolds number of the overhead power transmission line based on the thermal balance equation current-carrying capacity calculation formula of the overhead power transmission line. The technical problem that the current-carrying capacity detection error of the overhead power transmissionline is relatively large due to relatively low measurement precision of the environmental parameters of the overhead power transmission line in the prior art is solved.

Description

technical field [0001] The present application relates to the field of electric power technology, and in particular to a method and device for detecting the ampacity of an overhead transmission line. Background technique [0002] With the rapid growth of my country's economy, the demand for electricity has further increased, and the density and scale of the existing grid transmission corridors are increasing. Therefore, it is very difficult to build new transmission corridors on the basis of existing large-scale and high-density transmission corridors. Therefore, how to tap the potential transmission capacity on the basis of the current transmission corridor is an urgent problem to be solved. [0003] At present, the methods for increasing the capacity of overhead transmission lines can be divided into static capacity increasing technology and dynamic capacity increasing technology. Among them, the static capacity increase technology realizes the improvement of the carrying ...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01N25/20
CPCG01R31/003G01N25/20
Inventor 彭向阳王锐骆书剑周刚范亚洲
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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