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Method and system for determining thermal parameter of single-core cable conductor

A single-core cable, determination method technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve large errors, unfavorable accurate calculation of thermal parameters of cable conductors, regardless of thermal parameters in transient models Dynamic characteristics and other issues to achieve the effect of improving accuracy and reducing calculation errors

Active Publication Date: 2015-03-11
GUANGZHOU POWER SUPPLY CO LTD +1
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Problems solved by technology

For example, when calculating the temperature of the cable conductor, in the IEC60853 standard, the dynamic characteristics of the thermal parameters in the transient model are not considered, which introduces a large error, which is not conducive to the accurate calculation of the thermal parameters of the cable conductor

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  • Method and system for determining thermal parameter of single-core cable conductor
  • Method and system for determining thermal parameter of single-core cable conductor
  • Method and system for determining thermal parameter of single-core cable conductor

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Embodiment Construction

[0024] The content of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] Common single-core cables include conductors, insulation layers, cushion layers, air gap layers, metal sheath layers, and outer sheaths. They also include conductor shielding layers and insulating shielding layers. These two layers are very thin.

[0026] figure 1 is a cross-sectional structure diagram of a single-core cable, in figure 1 In the single-core cable shown, the cushion layer is a wrapping tape, and the metal sheath layer is a corrugated aluminum sheath.

[0027] First of all, in order to realize the optimization of the transient model of the single-core cable, according to the structural characteristics of the cable and based on the actual operation conditions, the following assumptions are made:

[0028] (1) Assuming that the geometric parameters of the materials of each layer of the cable are constant, the influence of temperature ...

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Abstract

The invention provides a method and a system for determining a thermal parameter of a single-core cable conductor. The method comprises the following steps: layer equivalent insulating layers by taking a conductor shielding layer, an insulating layer and an insulating and shielding layer of the single-core cable conductor as the equivalent insulating layers, respectively establishing an infinitesimal cylinder wall transient thermal circuit model of each equivalent insulating layer and infinitesimal cylinder wall transient thermal circuit models of other layers of the single-core cable; and connecting the infinitesimal cylinder wall transient thermal circuit models of the equivalent insulating layers and the other layers of the single-core cable in series according to a practical structure of the single-core cable to form an optimized transient thermal circuit model of the single-core cable, thus obtaining the thermal parameter of the single-core cable conductor according to the optimized transient thermal circuit model. The transient thermal circuit model of the single-core cable is optimized, the thermal parameter of the conductor can be solved by using the optimized transient thermal circuit model, the accuracy can be obviously improved, and a calculation error of carrying capacity of the cable can be reduced.

Description

【Technical field】 [0001] The invention relates to the technical field of power cables, in particular to a method and system for determining thermal parameters of single-core cable conductors. 【Background technique】 [0002] With the rapid development of urban construction and power construction, power cables have gradually become the main way of power transmission. For power cables, a basic parameter is the ampacity of the cable. When the cable is overloaded, it is easy to cause cable failure and accelerate the insulation aging of the cable, which is not conducive to the safe operation of the power grid; when the current carrying capacity of the cable is less than the set value, the current carrying capacity of the cable cannot be fully utilized, which does not meet the requirements economic principles. Therefore, it is necessary to accurately calculate the ampacity of the cable. [0003] The analytic algorithm by establishing the thermal circuit model is a widely used me...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 苏瑞波王鹏曾嘉荣罗海凹刘刚
Owner GUANGZHOU POWER SUPPLY CO LTD
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