Cable electrical fault analysis method based on distributed fiber temperature measurement

A technology for distributed optical fiber and electrical faults, applied in the direction of detecting faults, fault locations, thermometers, etc. by conductor type, which can solve the problems of misjudgment and missed judgment, difficulty in implementation, and long cycle.

Inactive Publication Date: 2017-11-28
STATE GRID TIANJIN ELECTRIC POWER +1
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AI Technical Summary

Problems solved by technology

The former has poor accuracy and reliability, which often leads to misjudgment and missed judgment; the latter experiment is difficult, costly, long-term, and poor in flexibility, and it is often difficult to implement

Method used

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Embodiment Construction

[0028] The technical solution of the present invention will be described in detail below in conjunction with specific embodiments.

[0029] A cable electrical fault analysis method based on distributed optical fiber temperature measurement, comprising the following steps:

[0030] Step 1: Establish a cable system model in the electromagnetic transient simulation software, set line parameters, determine the type of fault, perform fault simulation, and obtain the current value at the time of the fault. The specific methods are as follows:

[0031] (1) Select the electromagnetic transient simulation software, such as PSCAD / EMTDC and other similar computer-aided design software, establish the cable system model according to the line connection form, and select the type II equivalent circuit simulation cable;

[0032] (2) Determine the cable type and model, obtain cable parameters, including voltage level, length, neutral point grounding method, operating frequency, positive sequen...

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Abstract

The invention discloses a cable electrical fault analysis method based on the distributed fiber temperature measurement. The method comprises following steps of 1), establishing a cable system model, setting circuit parameters, determining the fault type, carrying out fault simulation and acquiring a current value during the fault in the electromagnetic transient simulation software; 2), according to the IEC60287 standard, establishing a transient hot circuit model of the cable and calculating the transient temperature of the cable during the fault; 3), establishing a thermodynamic finite element model of the cable and a temperature measurement cable, and using the model to simulate the steady-state temperature field distribution of the cable before the fault, and the transient temperature field distribution and change of the cable and the temperature measurement fiber after the fault; and 4), analyzing the simulation results and acquiring an electrical fault identification and positioning criterion of the cable. According to the invention, accuracy and reliability of the fault judgment can be improved; disadvantages in entity experiments can be overcome; and it is achieved that the distributed fiber temperature measurement is used for identifying and positioning electrical faults of the cable.

Description

technical field [0001] The invention relates to the field of electrical fault analysis methods, in particular to a cable electrical fault 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 coherent detection be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01K11/32G01K11/322G01K11/324
CPCG01K11/32G01R31/083
Inventor 孙宝平侯宏生董学坤杨福君杜彬田小禾李双宝
Owner STATE GRID TIANJIN ELECTRIC POWER
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