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Distributive optical fiber temperature measurement based cable electrical failure simulation analysis method

A technology for distributed optical fiber and electrical faults, applied in the fault location and other directions, can solve problems such as poor accuracy and difficult experiments, and achieve the effects of high work efficiency, overcoming the difficulties of physical experiments, and overcoming the poor accuracy of fault types based on experience.

Active Publication Date: 2014-04-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0007] The object of the present invention is to propose a cable electrical fault simulation analysis method based on distributed optical fiber temperature measurement, which is used to solve the problems of poor accuracy and difficult experiments when analyzing cable electrical faults using temperature measurement optical fiber temperature distribution data

Method used

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  • Distributive optical fiber temperature measurement based cable electrical failure simulation analysis method
  • Distributive optical fiber temperature measurement based cable electrical failure simulation analysis method
  • Distributive optical fiber temperature measurement based cable electrical failure simulation analysis method

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Embodiment Construction

[0037] The flow chart of cable electrical fault simulation analysis method that the present invention provides is as figure 1 shown. Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0038] 1. Use the electromagnetic transient simulation software PSCAD / EMTDC to establish a cable system model and set line parameters. Taking the optical fiber composite submarine cable laid in a certain strait as an example, the submarine cable is a YJQ41 type 110kV three-phase single-core high-voltage AC cable, and the neutral point grounding method is direct grounding. The submarine cable is 3km long, which is shorter than the wavelength of the 50Hz power frequency voltage, so the π-type equivalent circuit is used to simulate the submarine cable. According to the submarine cable technical agreement, the positive-sequence impedance is 0.077Ω / km, and the ratio of zero-sequence impedance to positive-sequence impedance is 2.415; there...

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Abstract

The invention belongs to the field of cable electrical failure simulation analysis and particularly relates to a distributive optical fiber temperature measurement based cable electrical failure simulation analysis method. The method comprises building a cable failure model, setting line parameters, determining failure types, performing failure simulation and obtaining the current value during the failure through electromagnetic transient simulation software; building a cable transient thermal path model according to IEC 60287 standards, and calculating the cable transient temperature during the failure; building a cable and temperature measurement optical fiber thermodynamic finite element model through finite element simulation software, and simulating the steady temperature field distribution before the failure and the transient temperature field distribution and changes after the failure of the cable and the temperature measurement optical fiber; obtaining cable electrical failure recognition and location criteria according to the temperature distribution and change rule of the temperature measurement optical fiber in simulation results. According to the method, the problems of poor accuracy, difficulties in experiment and the like during cable electrical failure analysis through temperature measurement optical fiber temperature distribution data are solved. The method has the advantages of being flexible in failure setting, high in work efficiency and the like.

Description

technical field [0001] The invention belongs to the field of cable electrical fault simulation analysis, in particular to a cable electrical fault simulation analysis method based on distributed optical fiber temperature measurement. Background technique [0002] With the development of distributed optical fiber sensing technology, temperature distribution information along the line can be obtained by using a temperature measuring optical fiber. The temperature measurement of optical fiber is generally obtained through the optical signal intensity or frequency information in the optical fiber. The equipment that realizes optical signal measurement is called distributed optical fiber temperature measurement equipment. The temperature measuring instrument based on optical fiber Raman scattering, based on optical fiber Brillouin scattering The strain and temperature measuring instrument of the and the strain and temperature measuring instrument based on optical fiber Rayleigh c...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 吕安强李永倩李静宋士刚
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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