Method for quickly obtaining highest temperature of steady-state cable core of four-loop trench cable

Abstract

The invention relates to a method for quickly abtaining the highest temperature of a steady-state cable core of a four-loop trench cable. The method comprises the following steps: 1) constructing a four-loop cable core highest temperature calculation model; 2) performing parameter estimation according to the groove cable physical model under the working conditions of different heat flows and environment temperatures to obtain a heat radiation coefficient value and each constant parameter in a four-loop cable core maximum temperature calculation model; and 3) obtaining the highest temperature of the grooved cable core according to the four-loop cable core highest temperature calculation model after fitting and parameter determination. Compared with the prior art, the invention has the advantages of high calculation speed, high calculation efficiency, clear physical meaning and the like.

Description

technical field [0001] The invention relates to the technical field of power cable operation, in particular to a method for quickly obtaining the maximum temperature of the steady-state core of a four-circuit grooved cable. Background technique [0002] With the development of the city and the need for aesthetics, cable laying has gradually shifted from overhead lines to underground cable laying. Underground cables enter and exit substations using trenches. The heat dissipation is close to the ground and is easily affected by sunlight, customs and other environments. In addition, the heat dissipation environment is even worse. The temperature rise of the cable core is not suitable for detection and other shortcomings. Due to the particularity of power cable operation, it is generally impossible to obtain the cable core temperature through direct measurement. At the same time, the existing real-time algorithms for predicting the heat and heat dissipation of grooved cables mos...

AI Technical Summary

Problems solved by technology

[0002] With the development of the city and the need for aesthetics, cable laying has gradually shifted from overhead lines to underground cable laying. Underground cables enter and exit substations using trenches. The heat dissipation is close to the ground and is easily affected by sunlight, customs and other environments. In addition, the heat dissipation environment is even worse. Disadvantages such as unsuitable detection of cable core temperature rise

Due to the particularity of power cable operation, it is generally impossible to obtain the cable core temperature through direct measurement. At the same time, the existing real-time algorithms for predicting the heat and heat dissipation of grooved cables mostly rely on temperature measuring components, which are costly and generally reliable. Dimensions are complex, and there is no possibility of large-scale promotion. On the whole, there is still a lack of effective methods for real-time calculation of the temperature rise of grooved cables. Therefore, it is very practical and necessary to study the rapid acquisition method of the steady-state temperature rise of grooved cables.

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