Rough distance measurement method of cable fault based on fault point burnthrough method

Abstract

The invention discloses a rough distance measurement method of a cable fault based on a fault point burnthrough method. The method comprises the steps of: constructing a power cable fault distance measurement system based on an LABVIEW virtual instrument development platform, wherein the system mainly comprises a signal source device, a data collection card and a computer, firstly inputting a DC negative high voltage on a cable core wire process a high-resistance fault point by using the fault point burnthrough method, so that the fault point generates arc discharge and carbonizes an insulating medium, a carbonization connection point has low resistance, and a high-resistance fault is converted into a low-resistance fault; and then applying a pule signal to the power core wire by the signal source device by using a low-voltage pulse method, so that the signal is propagated and reflected on the cable, and transmitting the position proportional relationship information of an obtained reflected pulse to the data collection card, transmitting, by the data collection card, the signal to the computer for processing and storage, then obtaining the location of the fault point, and displaying the result.

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 fault point burn-through 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...

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.