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Multi-circle cable steady-state temperature rise acquiring method based on transfer matrix

A technology of transfer matrix and acquisition method, which is applied in electrical digital data processing, special data processing applications, instruments, etc., and can solve problems such as large amount of calculation and low efficiency.

Active Publication Date: 2016-10-12
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • Multi-circle cable steady-state temperature rise acquiring method based on transfer matrix
  • Multi-circle cable steady-state temperature rise acquiring method based on transfer matrix
  • Multi-circle cable steady-state temperature rise acquiring method based on transfer matrix

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Embodiment

[0039] Using the superposition principle of the thermal field, the joint action of multiple cables is discretized into a combination of individual actions of multiple cables, and the mutual influence between the two is described by the transfer coefficient, and then a transfer matrix composed of lumped parameters is formed, that is, Realize the rapid calculation of the steady-state temperature rise of multi-circuit cables under multiple working conditions.

[0040] The following takes six independent single-core cables as an example for illustration.

[0041] Transition matrix A:

[0042] a 1 , 1 a 1 , 2 a 1 ...

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Abstract

The invention relates to a multi-circle cable steady-state temperature rise acquiring method based on a transfer matrix, used for acquiring the temperature rise of a multi-circle power cable. The method comprises the steps of 1, acquiring the transfer matrix A of a multi-circle cable steady-state temperature rise model, and establishing a multi-circle cable steady-state temperature rise model; 2, setting an initial temperature rise matrix T0 and acquiring an initial heat flow matrix Q0 corresponding to the initial temperature rise matrix T0; 3, acquiring a next temperature rise matrix T1 according to the multi-circle cable steady-state temperature rise model and the initial heat flow matrix Q0; and 4, judging the maximal difference between all corresponding elements of the initial temperature rise matrix T0 and the next temperature rise matrix T1 is more than a convergence threshold, if yes, replacing T0 with T1, and returning to the step 2, and if no, determining the current corresponding temperature rise matrix to be a steady-state temperature rise matrix. Compared with the prior art, the method has the advantages of being simple in computation, accurate, high in computing efficiency and advanced in algorithm.

Description

technical field [0001] The invention relates to the technical field of power cable operation, in particular to a transfer matrix-based method for obtaining steady-state temperature rise of multi-circuit cables. 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. Considering the compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 傅晨钊司文荣李红雷姚周飞
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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