Indirect measuring method for cable core temperature

A measurement method and cable technology, applied in thermometers, measuring devices, measuring heat, etc., can solve problems such as difficult to satisfy, limited accuracy of results, large amount of calculation, etc., to achieve convenient calculation process and strong practicability Effect

Active Publication Date: 2014-05-21
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has the following defects: first, the specified calculation conditions are very harsh and generally difficult to meet well; second, it needs to use a large amount of established data such as the detailed structure size of the cable, the thermal physical parameters of various materials, etc., and the calculation error larger
This method has the following defects: first, different models need to be established for different situations, and the universality is low; second, the boundary conditions must be set accurately, and the calculation process is sensiti

Method used

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  • Indirect measuring method for cable core temperature
  • Indirect measuring method for cable core temperature
  • Indirect measuring method for cable core temperature

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Experimental program
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Embodiment example

[0078] In order to verify the effect of a kind of cable core temperature indirect measurement method provided by the present invention, carry out following experiment:

[0079] Two groups of measurement data of a certain cable at different times were randomly selected, and one group was used as learning data, and the other group was used as test data to carry out experiments. , the experimental results such as Figure 4 As shown, the dotted line represents the calculated curve, the solid line represents the measured curve, the horizontal axis is time, and the vertical axis is the core temperature. It can be seen from the figure that, but the calculated curve and the measured curve nearly overlap, and the accuracy of the calculated result is very high.

[0080] The software platform for the experiment is MATLAB, and the time-consuming and error ranges are: 0.050s, -1.27°C-1.49°C.

[0081] In summary, it can be shown that the indirect measurement method provided by the present...

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Abstract

The invention discloses an indirect measuring method for cable core temperature. The method comprises the following steps: 1, establishing a theoretical heat transfer model of a cable; 2, calculating model parameters in the theoretical model; 3, measuring running data of partial parameters of the cable; 4, calculating the cable core temperature of the cable through the model parameters and the measured running data to finish indirect measurement. The indirect measuring method has the advantages of easiness, rapidness and accuracy.

Description

technical field [0001] The invention relates to the technical field of transmission cables, in particular to an indirect measurement method for cable core temperature. Background technique [0002] In the construction of modern urban power facilities, power cables have been widely used as the core carrier of power transmission, and the proportion of cables in urban and rural power grids is also increasing. Real-time monitoring of the operating status of cables and safe maintenance are of great importance to life and production. Significance. In addition, cable maintenance and replacement projects are large and costly. How to ensure that cables can work normally for a long time and prolong their operating life has become the focus of research in the field of cable technology. [0003] Studies have shown that the operating life of power cables mainly depends on the life of the cable insulation, and the temperature plays a key role in the life of the insulation. When the temp...

Claims

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Application Information

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IPC IPC(8): G01K11/00
Inventor 方睿鲁华祥李志坚边昳骆辰陈天翔
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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