Cable joint thermal field calculation method based on generalized time domain finite difference
A time domain finite difference, cable joint technology, applied in the direction of calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as poor insulation performance and complex cable joints
Active Publication Date: 2020-05-15
SOUTHEAST UNIV
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Problems solved by technology
Due to the relatively complex internal structure of the cable joint and relatively poor insulation performance, its failure probability is significantly greater than that of the cable body
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[0044] The technical solution of the present invention will be further introduced below in combination with specific embodiments.
[0045] Such as figure 1 As shown, the cable joint can be regarded as a structure composed of multiple cylindrical walls. Now the entire cable joint and its surrounding environment are taken as the research thermal field.
[0046] In this implementation example, the temperature distribution of the thermal field will be calculated based on the generalized time-domain finite difference method, and the specific steps are as follows.
[0047] S1: The shape and location of heat sources and various constituent materials within a given field.
[0048] Such as figure 1 As shown, the cable joint structure includes cable core, cross-linked polyethylene, stress cone, connecting sleeve and silicone rubber, and the surrounding environment is air.
[0049] S2: The temperature distribution in the thermal field at a given initial moment.
[0050] The temperat...
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The invention discloses a cable joint thermal field calculation method based on generalized time domain finite difference. The method comprises the following steps: establishing a model of a cable joint, wherein a thermal field domain is composed of a heating source and a plurality of materials with different heat conduction capacities; taking a heat conduction differential equation as a numericalcalculation equation of internal points of a thermal field domain, wherein the boundary conditions comprise Dirichlet boundary conditions and Newman boundary conditions; adopting a generalized time domain finite difference method to discretize a thermal field domain in space and time scales, and solving temperature distribution in the field domain at the next moment. Through repeated calculation,the change of temperature distribution relative to time can be simulated. Compared with a traditional difference method, the generalized time domain finite difference method adopted in the method isa meshless time-varying difference numerical calculation method, free point distribution can be carried out according to geometrical characteristics of different materials in a field domain so as to reduce calculation complexity, and changes of thermal field distribution on two scales of space and time can also be considered.
Description
technical field [0001] The invention can be used in engineering fields such as fault detection and prediction of cable joints, and the calculation method is applicable to two-dimensional and three-dimensional models. Background technique [0002] Cable glands are an important part of connecting two lengths of cable. Since the internal structure of the cable joint is relatively complex and its insulation performance is relatively poor, its failure probability is significantly greater than that of the cable itself. The heating phenomenon of the cable joint after it is put into operation is an important reason for the aging and failure of the cable joint. Therefore, accurately measuring the temperature distribution inside and around the cable joint plays an important role in detecting, predicting faults, and prolonging the service life of the materials used to form the cable joint. Contents of the invention [0003] The object of the present invention is to solve the above ...
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IPC IPC(8): G06F30/23G06F119/08
CPCY02E60/00
Inventor 何嘉弘何康仲林林
Owner SOUTHEAST UNIV