Cable ampacity analysis system based on linear temperature-sensitive technology and calculation method for cable ampacity

A flow analysis and cable technology, applied in the field of cable current carrying analysis system to achieve the effect of improving the operation level

Inactive Publication Date: 2013-07-31
STATE GRID CORP OF CHINA +2
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AI Technical Summary

Problems solved by technology

Therefore, directly using the steady-state ampacity as a restrictive index for the operation and management of cable lines has certain limitations.

Method used

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  • Cable ampacity analysis system based on linear temperature-sensitive technology and calculation method for cable ampacity
  • Cable ampacity analysis system based on linear temperature-sensitive technology and calculation method for cable ampacity
  • Cable ampacity analysis system based on linear temperature-sensitive technology and calculation method for cable ampacity

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Embodiment Construction

[0070] as attached Figure 1-2 As shown, the present invention includes a server 1, a distributed linear temperature sensing system 2 and a cable load detection device 3. It is composed of a connected wavelength tunable laser 4 and a light intensity detector 6 . In the invention, the optical fiber grating temperature-sensing optical cable is continuously laid along the outer wall of the cable. The output light of the wavelength tunable laser 4 is reflected by the fiber grating temperature-sensing optical cable and then received by the light intensity detector 6 . When the wavelength of the wavelength-tunable laser 4 coincides with the wavelength of the fiber Bragg grating temperature-sensing optical cable, the reflection intensity is maximum at this time, and the power received by the light intensity detector 6 is also the strongest. The wavelength information of the sensing grating can be detected according to the corresponding relationship of "tunable laser wavelength - de...

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Abstract

The invention relates to a cable ampacity analysis system based on a linear temperature-sensitive technology and a calculation method for cable ampacity. The cable ampacity analysis system comprises a server, as well as a distribution type linear temperature-sensitive system and a cable load detector, which are connected with the server, wherein the distribution type linear temperature-sensitive system is formed by a temperature-sensitive optical cable laid on a cable to be detected, a wavelength-adjustable laser and a light intensity detector, and the wavelength-adjustable laser and the light intensity detector are connected with the temperature-sensitive optical cable. According to the invention, via adding a dynamic time variable, correspondence relationship among cable electric flux, surface temperature of a cable outer protective sleeve, cable environmental temperature and cable heat radiation during the operation of the cable is established, and the temperature of a conductor of the cable is calculated, as a result, the analysis system and the calculation method provide a decision basis for ensuring safe operation of cables in cities and reasonably deploying power transmission capacity, supply a scientific basis to scientific load dispatch, and have import significance.

Description

technical field [0001] The invention relates to a cable current carrying capacity analysis system and calculation method based on linear temperature sensing technology. Background technique [0002] With the development of the country and the accompanying transformation and implementation of power grids, especially the continuous deepening of urban network transformation and construction, the use of power cables has increased significantly, and the rate of underground cables in urban central areas has continued to increase, which has led to the operation of power cables The management, analysis and maintenance work has become more and more important, and the workload is also increasing day by day. [0003] The conductor temperature during cable operation is the basis for determining whether the cable meets the rated current carrying capacity and whether it is safe to operate. When the cable is running under rated load, the core temperature is at the allowable value. On...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01K11/32G01K11/3206
CPCG01K11/32
Inventor 王慧明赵立刚刘国平赵平曾军吴仁虎邢昆徐亚兵郭涛武彦明成洪刚
Owner STATE GRID CORP OF CHINA
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