Distributed high voltage cable partial discharge online monitoring and positioning system

Abstract

A distributed high-voltage cable partial discharge online monitoring and positioning system, including a signal preprocessing module that filters and amplifies the sensor coupling signal; and then collects, displays and stores the signal processed by the signal preprocessing module. module; then transfer the data to the data signal processing module for analysis and processing, calculate the parameters of partial discharge and discharge spectrum information, and remotely transmit the data to the data analysis module through the communication module, and the above functions are all provided by the power module. Required voltage; The invention adopts a high sampling rate and a high pulse capture repetition rate, which can improve the accuracy and sensitivity of cable partial discharge monitoring, and at the same time can realize the positioning and identification of cable partial discharge fault points; the invention can adopt external power frequency according to site conditions Signal or internal power frequency signal, phase matching is performed on the collected partial discharge, which improves the accuracy of partial discharge pattern recognition.

Description

technical field [0001] The invention belongs to the technical field of electric cable partial discharge detection, and in particular relates to an on-line monitoring and positioning system for distributed partial discharge of high-voltage cables. Background technique [0002] At present, cross-linked polyethylene (XLPE) cables have been widely used in the national grid, and their insulation performance is directly related to the safe operation of the grid. Due to poor cable manufacturing technology and improper installation of cable accessories on site, the cable will generate partial discharge, which will affect the cable. Insulation, partial discharge is an important parameter of cable insulation aging, so it is particularly important to monitor and locate partial discharge of cables. [0003] The traditional partial discharge detection of power cables is to conduct live detection at a single point (cable joint or terminal) to determine whether there is partial discharge. ...

AI Technical Summary

Problems solved by technology

[0006] (1) The cable partial discharge online monitoring system has a large equipment volume, and a large number of optical fiber cables need to be laid on site, so the monitoring cost is high; each unit of the distributed cable partial discharge online monitoring needs to collect synchronously, so as to complete the partial discharge positioning later

[0007] (2) On-line partial discharge monitoring system for cables, relying on the installed power frequency current sensor to collect power frequency signals to trigger three-channel synchronous acquisition, the system collects 20ms power frequency cycle time, multiple continuous data acquisitions are large, and data analysis and positioning are slow , the phase information of partial discharge is calculated from the power frequency signal, and it is impossible to detect the cable lines that have not been in operation

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