10kv three-core cable temperature field model establishing method

A three-core cable, model building technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problem of difficult to achieve the core temperature, and achieve the effect of preventing accidents

Active Publication Date: 2015-05-20
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] It is difficult to directly measure the core temperature of XLPE cables in actual engineering. It is necessary to establish a suitable cable thermal circuit model and calculate the core temperature from the external temperature

Method used

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  • 10kv three-core cable temperature field model establishing method
  • 10kv three-core cable temperature field model establishing method
  • 10kv three-core cable temperature field model establishing method

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with specific examples.

[0036] The 10kV three-core cable temperature field model establishment method described in this embodiment is based on YJV22-8.7 / 10-3×240mm 2 Take the three-core cable as an example, the specific conditions are as follows:

[0037] 1) Use ANSYS simulation software to simulate the thermal field of the 10kV three-core cable, and obtain the temperature field distribution diagram of the radial section, as shown in figure 1 shown. According to the heat transfer characteristics from the conductor to the cable surface inside the cable, the following modeling assumptions are made:

[0038] A. The geometric parameters of the materials of each layer of the cable are constant, and the influence of temperature on the geometric parameters is ignored;

[0039] B. Ignore axial heat transfer, and consider that the cable is axisymmetric and uniformly heat transfer along the circumferential ...

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Abstract

The invention discloses a 10kV three-core cable temperature field model establishing method. The method includes the steps that 1, thermal field simulation is conducted on a 10 kV three-core cable loaded with current through ANSYS simulation software, and a temperature field distribution diagram of a cable radial section is obtained; 2, the cable section is cut through a cutting method in cooperation with a cable symmetrical structure and the isotherm, the cable is equally cut into three parts according to three cable cores, and one of the three parts is selected to serve as the research object; 3, a steady state thermal circuit model is established for the selected one-third cable structure, and cable structure layers located on the isotherm on the same diagram serve as joints in the thermal circuit model; 4, the thermal resistance generated when heat flow flows through all layers of cable materials and the generated losses are determined; 5, the 10 kV three-core cable steady state thermal circuit model is established according to the temperature field distribution diagram of the 10 kV three-core cable, all the joints in the determined thermal circuit model, the heat resistance among all the joints and the losses of various materials. The established 10kV three-core cable steady state thermal circuit model can be used for numerical calculation.

Description

technical field [0001] The invention relates to the technical field of temperature field distribution and carrying capacity calculation of a 10kV three-core cable, in particular to a method for establishing a temperature field model of a 10kV three-core cable. Background technique [0002] With the increasing use of cross-linked polyethylene (XLPE) power cables in the distribution network year by year, the corresponding diagnosis and maintenance work is becoming more and more important. As an important operating parameter of XLPE cables, core temperature is an important basis for judging the operating status of the cable and its actual current carrying capacity; during normal operation, the core temperature of the cable does not exceed the maximum operating temperature of XLPE (≤90°C) ;Once overloaded, the temperature of the cable core will rise sharply, thereby accelerating insulation aging and even causing fire accidents; to accurately grasp the real ampacity of the cable,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 刘刚王鹏
Owner SOUTH CHINA UNIV OF TECH
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