Cable fault coarse ranging method based on secondary pulse method

Abstract

The invention discloses a cable fault coarse ranging method based on a secondary pulse method. The method comprises the following steps: constructing a power cable fault ranging system based on a LABVIEW virtual instrument development platform, wherein the system mainly comprises signal source equipment, a sensor, a data collection card and a computer; performing fault testing on the fault power cable by using the secondary pulse method firstly, wherein the fault testing comprises the steps that the signal source equipment is added on the power cable, the sensor transmits a signal to the datacollection card, and the data collection card retransmits the signal to the computer for processing, storage and display; and through the secondary pulse analysis method, determining a signal pulse starting time point, performing the fault distance computation, and then performing result display, and overlaying the low-voltage pulse reflecting waveforms successively received in twice through the secondary pulse method, wherein two waveforms have one obvious divergence point, and the divergence point is the reflection waveform point of the fault point. The method has the characteristics of being easy to operate and multifunctional, and an echo graph is easy to explain.

Description

technical field [0001] The invention relates to a cable fault distance measurement method in a power system, in particular to a cable fault rough distance measurement method based on a secondary pulse method. Background technique [0002] In order to improve the reliability of power supply, these increasing cable faults must be repaired in the shortest time. However, power cables are special transmission lines buried underground, and it is not convenient to directly observe and find fault points. If the location of the fault point cannot be found out in time, it will not be repaired, resulting in long-term power outages and production stoppages, which will bring huge economic losses and inconvenience to people's lives. Therefore, how to quickly and accurately determine the location of the fault point of the power cable is the premise guarantee for timely repairing the power cable and improving the reliability of power supply. How to choose the fault location method is a sub...

AI Technical Summary

Problems solved by technology

[0002] In order to improve the reliability of power supply, these increasing cable faults must be repaired in the shortest time. However, power cables are special transmission lines buried underground, and it is not convenient to directly observe and find fault points.

If the location of the fault point cannot be found in time, it cannot be repaired, resulting in long-term power outages and production stoppages, which will bring huge economic losses and bring inconvenience to people's lives.