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Method for measuring thermal resistance of three-core cable packing layer

A three-core cable and filling layer technology is applied in the field of thermal resistance measurement of cable filling layer, which can solve the problem of difficulty in measuring the thermal resistance of the three-core cable filling layer, and achieve the effects of good reliability, convenient experimental operation and slight damage.

Active Publication Date: 2013-08-14
广州骏拓电力科技有限公司 +1
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Problems solved by technology

[0005] In order to overcome the problem that the thermal resistance of the filling layer of the three-core cable is difficult to measure in the prior art, the present invention provides a method for measuring the thermal resistance of the filling layer of the three-core cable. The measurement process of the present invention is direct and the result is accurate

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  • Method for measuring thermal resistance of three-core cable packing layer
  • Method for measuring thermal resistance of three-core cable packing layer
  • Method for measuring thermal resistance of three-core cable packing layer

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Embodiment

[0026] Such as figure 1 As shown, the structure of the three-core cable from outside to inside is outer sheath 1, armor tape 2, inner sheath 3, wrapping tape 4, filling layer 5, and three cores; each core is from outside to inside They are the metal shielding layer 61, the insulating layer 62, the conductor shielding layer 63, the conductor 64, and the central closed area 7 formed by connecting the metal shielding layers 61 of the three wire cores.

[0027] Such as figure 2 As shown, the temperature field distribution diagram of the three-core cable at 90°C obtained by using ANSYS simulation software, in which the conductor temperature is 90°C, the cable skin temperature is 58°C, and the thermal field distribution characteristics of the section of the three-core cable in a steady state are The same layer is isothermal outside the armored layer. This is due to the high thermal conductivity of the armored layer and good temperature uniformity. However, the inner conductor outs...

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Abstract

The invention discloses a method for measuring a thermal resistance of a three-core cable packing layer. The method comprises the following steps of: selecting any cross section of a three-core cable, acquiring the thickest radial direction of a packing layer in the cross section according to the appearance fluctuated characteristic of the three-core cable, drilling three holes along the radial direction, and respectively measuring the temperature of an armoring layer, an inner jacket and a central point in a closed area of the three-core cable by adopting a thermocouple respectively in the three holes; and on the basis of the steady thermal field distribution of the three-core cable and the principle that the heat conduction heat flow rate of each layer in the radial direction is identical at the steady state, calculating the thermal resistance of the packing layer in the thickest radial direction by utilizing the measured data. Due to the adoption of the method, the difficulty for sampling parameters of the packing layer of the three-core cable in the process for calculating the temperature of a steady conductor can be overcome, the measuring process is more direct, and the measuring result is more accurate.

Description

technical field [0001] The invention relates to a thermal resistance measurement technology of a cable filling layer, in particular to a method for measuring the thermal resistance of a three-core cable filling layer. Background technique [0002] The most direct characteristic quantity of the amplitude change of the ampacity of the power cable conductor is the change of the conductor temperature. Once the steady-state temperature of the cable conductor is determined, it is easy to determine the steady-state ampacity of the power cable line. However, there are still technical difficulties in directly measuring the cable conductor temperature, especially for three-core cables. Generally, the conductor temperature can only be calculated by measuring the surface temperature of the cable. For the calculation of the conductor temperature of the three-core cable, it is the most difficult to determine and has the greatest influence. The parameter is the thermal resistance of the fi...

Claims

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Application Information

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IPC IPC(8): G01N25/20
Inventor 刘刚胡倩楠
Owner 广州骏拓电力科技有限公司
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