Cable fault positioning simulation method using time domain reflectometry

Abstract

The invention discloses a cable fault positioning simulation method using time domain reflectometry. The method includes the following steps that S100, a cable distributed parameter circuit model is established through Pspice simulation software according to the operating parameter of a cable to be detected; S200, an equivalent circuit model of a pulse generator and an equivalent circuit model of an oscilloscope are established through the Pspice simulation software, wherein different pulse widths can be set in the pulse generator; S300, the model of coaxial cable transmission lines connected among the cable to be detected, the pulse generator and the oscilloscope and the model of coaxial cable transmission line connecting points are established; S400, the simulation system is made to operate according to an established artificial circuit model, the traveling wave propagation process of any node is tested, and meanwhile the actual reflected impulse waveform of the cable to be detected can be tested. By the adoption of the cable fault positioning simulation method, the operation accuracy of simulation experiments is improved, and extremely high application value is achieved to application and study of a time domain pulse method.

Description

technical field [0001] The invention relates to power system simulation technology, in particular to a time domain reflection method cable fault simulation method. Background technique [0002] Power cables are widely used in electric power, communication industry and other industries. The increase in the number of cables and the extension of running time will lead to an increase in the frequency of cable failures. Power cable fault point location is an important means for power system cable related technology research, operation defect detection, and condition-based maintenance. [0003] There are many kinds of cable fault location, time domain reflection method is one of them, the time domain pulse method injects a pulse signal at one end of the cable, detects its reflected pulse, according to the characteristics of the incident pulse and reflected pulse and the time difference between the two pulses. Judging the nature of the fault and locating the fault point. In the ...

AI Technical Summary

Problems solved by technology

At present, for the time domain reflection method cable fault location simulation technology, the simulation model is too simplistic compared with the actual test, and the propagation law of the pulse in the cable is not intuitive, and the relationship between the test pulse of the oscilloscope and the actual reflected pulse of the cable under test is inconsistent. clear question

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