Cable temperature rise test method considering axial heat transfer of cable joint

Abstract

The invention discloses a cable temperature rise test method considering axial heat transfer of a cable joint, and relates to the technical field of research on heat transfer and temperature rise characteristics of high-voltage cable joints, and the method comprises the steps: building a physical model comprising the cable joint and cables connected with the two ends of the cable joint; under a set critical working condition, establishing corresponding temperature distribution models under different current conditions by using the physical model, determining an axial heat transfer range of a cable joint and the cable, and determining the length of the cable to be tested according to the axial heat transfer range; temperature sensors are arranged on the cable joint and the cable with the determined length at equal intervals, and a temperature compensation device is arranged at the tail end of the cable to measure the temperature of the cable joint and the conductor on the cable. The axial heat transfer problem of the cable joint and the experiment equipment cost problem are considered at the same time, the cable line is used as short as possible under the condition that the influence of the axial heat transfer of the joint on the temperature rise of the cable body is eliminated, and the experiment platform cost is reduced.

Description

technical field [0001] The invention relates to the technical field of research on heat transfer and temperature rise characteristics of high-voltage cable joints, and specifically designs a cable temperature rise test method considering the axial heat transfer of the cable joint. Background technique [0002] With the continuous increase of national electric energy demand, the operating load of cable lines continues to increase. Long-distance cable lines need to be connected by intermediate cable joints. In high-voltage cable lines, the requirements for insulation are higher, which makes the volume of the joint insulation larger. Such a structural design will inevitably increase the heat transfer path of the intermediate cable joint, thereby increasing the Conductor temperature, resulting in overheating operation, and in severe cases, may lead to joint fire, explosion and other accidents. [0003] The radial thermal resistance of the cable body and the cable joint is analy...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a cable temperature rise test method considering the axial heat transfer of the cable joint to solve the problem of inaccurate cable temperature rise test values ​​and cost waste due to the axial heat transfer of the cable joint in the prior art. Methods The temperature field model of the cable joint and the main body was constructed through finite element simulation, and the length of the experimental cable main body was determined; then, a high-current temperature rise experimental loop was built according to the determined cable length, and temperature sensors were arranged equidistantly on the conductors of the cable joint and the main body , to monitor the conductor temperature of the cable joint in real time

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