A Method for Obtaining Steady-state Temperature Rise of Multi-circuit Cable Adapting to Various Boundary Conditions

Abstract

The invention relates to a multi-loop cable steady-state temperature rise acquisition method adapting to various boundary conditions. The method comprises the following steps: 1) constructing a multi-loop cable steady-state temperature rise model adapting to various boundary conditions according to a thermal field superposition principle; 2) acquiring an initial temperature rise matrix T<0> according to a set initial heat flow matrix Q<0>; 3) performing reduction according to the initial temperature rise matrix T<0> and the boundary conditions to form a reduced heat flow matrix Q<1>; 4) acquiring a next-step temperature rise matrix T<1> according to the reduced heat flow matrix Q<1>; and 5) judging whether a maximum difference value among all elements which correspond to the initial temperature rise matrix T<0> and the next-step temperature rise matrix T<1> is greater than a convergence threshold or not, if so, substituting T<0> with T<1> and returning to the step 3), and otherwise, judging that a current corresponding temperature rise matrix is a steady-state temperature rise matrix. Compared with the prior art, the multi-loop cable steady-state temperature rise acquisition method has the advantages of easiness and accuracy in calculation, high calculation efficiency, advanced algorithm, adaptability to various boundary conditions, and the like.

Description

technical field [0001] The invention relates to the technical field of power cable operation, in particular to a method for obtaining steady-state temperature rise of multi-circuit cables adapting to various boundary conditions. Background technique [0002] Due to the particularity of the power cable operation, it is generally impossible to obtain the core temperature of the power cable through direct measurement, so technicians have proposed a variety of methods to calculate the core temperature of the power cable, all of which are based on numerical solutions and test results. Engineering formulas or Approximate formula. For example, based on the IEC60287 standard, it is a classic calculation method for calculating the core temperature of power cables, and a solution method for ampacity based on numerical calculation. However, similar studies mostly focus on single-circuit cables, and numerical methods are often used to solve multi-circuit cables in actual operation. Con...

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Problems solved by technology

However, similar studies mostly focus on single-circuit cables, and numerical methods are often used to solve multi-circuit cables in actual operation. Considering the complexity of the working conditions, the required calculation is huge, and the efficiency in specific implementation is very low.

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