Indirect measuring method for cable core temperature

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...

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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 sensitive to them, and the robustness is low; third, The amount of calculation is large, and repeated iterative operations are required

This method has the following defects: first, the establishment and training of the model rely on the generalization method, which does not make full use of the existing prior knowledge about the cable structure and heat transfer, and the accuracy of the results is limited; There are many input variables, often containing some physical quantities that are equally difficult to measure (such as the ambient temperature around the cable, etc.)

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