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Infinitesimal-based conductor temperature calculation method for cable joint and body

A technology for the temperature of cable joints and conductors is applied in the field of conductor temperature calculation of cable joints and bodies, and can solve the problems of difficult to guarantee the accuracy of temperature monitoring results, complex modeling process, and low calculation accuracy.

Active Publication Date: 2021-07-30
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing numerical calculation method uses software such as finite element to carry out simulation calculation, and the modeling process is complicated, which is not conducive to the direct use of non-professional personnel;
[0005] The existing cable joint heat circuit model calculates the temperature distribution, its calculation accuracy is low, and the error between the calculation result and the actual conductor temperature is large;
[0006] It is very difficult to realize real-time online monitoring of cable joint conductor temperature, and it is difficult to guarantee the accuracy of temperature monitoring results in the environment of strong electromagnetic interference, which is not conducive to the improvement of the current carrying capacity of cable lines

Method used

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  • Infinitesimal-based conductor temperature calculation method for cable joint and body
  • Infinitesimal-based conductor temperature calculation method for cable joint and body
  • Infinitesimal-based conductor temperature calculation method for cable joint and body

Examples

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no. 1 example ；

[0026] refer to Figure 1 to Figure 3 , an embodiment of the present invention provides a method for calculating the conductor temperature of a cable joint and a body based on microelements, which is used to calculate the conductor temperature of the cable joint and the cable body adjacent to the cable joint, comprising the following steps:

[0027] S100. Construct an axial thermal circuit model. The axial thermal circuit model divides the cable joint into multiple sections according to the insulation thickness of each structure of the cable joint, and takes the center of the crimping tube of the cable joint as the origin to divide each section of the cable joint in the axial direction. The segmented intervals are respectively divided into multi-segment micro-units; and the cable body is divided into multi-segment micro-units along the axial direction.

[0028] It should be noted that since the structure of the cable joint is axisymmetric, and the structure of the long end is ...

no. 2 example ；

[0080] In order to verify the effect of the embodiments of the present invention, a set of experimental data is provided below:

[0081] To adapt to 110kV 630mm 2 For the straight-through joint of the cable, the carrying capacity of the line is 1000A as an example. The axial thermal circuit model proposed in the embodiment of the method is used to calculate the conductor temperature. The theoretical calculation results and the simulation calculation results, as well as the joint temperature calculation proposed by the Egyptian scholar M.M.Abdel The results of the method are compared, the results are as follows Figure 4 shown. In the experiment, the distance of each micro-element is as follows:

[0082] Short-end crimping tube, short-end main insulation, short-end copper shell thin layer, short-end body micro-element lengths are 0.098m, 0.071m, 0.075m, 0.1257m respectively; long-end crimping tube, long-end main insulation, long-end The microelement lengths of the copper she...

no. 3 example ；

[0085] refer to Figure 5 , an embodiment of the present invention provides a conductor temperature calculation device based on a micro-element cable joint and a body, the conductor temperature calculation device based on a micro-element cable joint and a body can be any type of intelligent terminal, such as a mobile phone , Tablet PC, PC, etc.

[0086] Specifically, the microelement-based cable joint and conductor temperature calculation device of the body includes: one or more control processors and memory. The control processor and memory can be connected by bus or other means.

[0087] As a non-transitory computer-readable storage medium, the memory can be used to store non-transitory software programs, non-transitory computer executable programs and modules, such as the microelement-based cable connector and the conductor of the body in the embodiment of the present invention The program instruction / module corresponding to the temperature calculation device. The contro...

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Abstract

The invention discloses an infinitesimal-based conductor temperature calculation method for a cable joint and a body, and the method comprises the steps: constructing an axial thermal circuit model, and enabling the axial thermal circuit model to divide the cable joint into a plurality of segment intervals according to the insulation thickness of each structure of the cable joint, dividing each segment interval of the cable joint into a plurality of segments of infinitesimal elements along the axial direction by taking the center of a crimping pipe of the cable joint as an original point; uniformly dividing the cable body into a plurality of sections of infinitesimal elements along the axial direction; and based on the axial thermal circuit model, inputting the surface temperatures of the cable joint and the cable body, and carrying out iterative calculation to obtain the conductor temperatures of the cable joint and the cable body. Compared with the prior art, the method has the advantages that the calculation result is more accurate, the calculation result can be obtained only by inputting the surface temperatures of the cable joint and the body in the model, less time and energy are consumed, and the problem that the sensor is difficult to arrange is solved.

Description

technical field [0001] The invention relates to the technical field of cable joint conductor temperature measurement, in particular to a method for calculating the conductor temperature of a cable joint and a body based on microelements. Background technique [0002] With the rapid development of urban power grid systems, high-voltage power cables have been widely used in power transmission networks, and the number of intermediate joints used to connect cables at both ends is also increasing. The ampacity of the cable is closely related to the temperature of the conductor. Practical experience has proved that due to the thick insulation of the cable joint and the internal contact resistance, the temperature of the conductor of the cable joint is much higher than that of the cable conductor under the same load level, which becomes the bottleneck restricting the ampacity of the line. [0003] At present, the analytical method and numerical calculation method are generally used...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F111/04G06F111/10G06F113/04G06F113/16G06F119/08
CPCG06F30/20G06F2111/04G06F2111/10G06F2119/08G06F2113/16G06F2113/04
Inventor 卞佳音肖健健苏俊亮张珏单鲁平慕容啟华徐研马世禄顾侃贺伟蚁暄潮黄明烽
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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