Simulation method of opening radius of energy release hole of high-voltage cable joint explosion-proof device

Abstract

The invention relates to the technical field of explosion-proof devices for high-voltage cable joints, and specifically relates to a simulation method for the opening radius of an energy release holeof a high-voltage cable joint explosion-proof device, which comprises the following steps of: adopting COMSOL Multiphysics multi-physical field coupling simulation software to construct models of different types of energy release hole explosion-proof devices; adopting the mode of heat-flow-solid multi-physical field coupling, calculating the maximum gas velocity and pressure distribution in the explosion-proof chamber corresponding to the design of different radii of the blowout holes; according to the exponential function law, obtaining the function relation between the maximum pressure and the size of the energy dissipation hole in the explosion-proof device by the least square method. Considering the secondary damage caused by the reduction of the maximum pressure inside the explosion-proof device and the reduction of the jet flow through the vent hole, the optimized radius of the vent hole is designed. The invention can optimize the size design of the energy dissipation hole of theexplosion-proof device of the high-voltage cable joint, save the test cost, improve the protection precision, and provide a reliable theoretical calculation method for the explosion-proof device design.

Description

technical field [0001] The invention relates to the technical field of explosion-proof design of high-voltage cable joints, and more particularly, to a simulation method for the opening radius of a discharge hole of an explosion-proof device for high-voltage cable joints. Background technique [0002] In order to prevent the insulation breakdown of the intermediate joint of the power cable, causing the explosion accident of the intermediate joint of the power cable, and causing the line to trip and cut off the power, an explosion-proof device for the intermediate joint of the power cable must be adopted. There are regulations in the industry that clearly point out that the outermost layer of non-directly buried cable joints should be covered with flame-retardant materials, and oil-filled cable joints and joints of densely laid medium-voltage cables should be sealed with fire-resistant and explosion-proof boxes. The explosion-proof device of the intermediate joint of the powe...

AI Technical Summary

Problems solved by technology

In practical applications, it is more cumbersome to design multiple energy dissipation holes at the same time, and it is not conducive to waterproofing, and it is difficult to achieve the expected protection effect

In the past, the research on the opening radius and opening radius of the scheme of using two energy-dissipating holes with large openings basically relied on the manufacturer's experience, and there were large deviations in practical applications, and the protection effect could not be optimized.

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