Intelligent single-phase grounding fault detection device for 10 kV line

Abstract

The invention relates to an intelligent single-phase grounding fault detection device for a 10 kV line, which comprises a shell and a detection device arranged in the shell, wherein the detection device comprises a data interaction unit, a power supply module, a comprehensive data processing module and a control system which are electrically connected; the data interaction unit is arranged on theshell and comprises an adjusting device, an operation indicating lamp, a power supply indicating lamp and a plug interface; the comprehensive data processing module comprises a data preprocessing unit, an analog-to-digital conversion unit and a level conversion unit; the control system comprises a current characteristic analysis unit and a fault judgment unit; and through the coordination of eachmodule unit of the control system, the current change characteristics are periodically analyzed, the judgment and analysis results are directly displayed on a power distribution terminal, and meanwhile, the signals of the judgment results are transmitted to a master station server and displayed in a background monitoring system. The intelligent single-phase earth fault detection device for a 10 kVline has the characteristics of rapidly positioning the fault section, improving the emergency repair speed of the single-phase grounding fault, improving the power supply reliability and the like.

Description

technical field [0001] The invention relates to a single-phase fault detection tool for a power distribution line, in particular to an intelligent single-phase ground fault detection device for a 10kV line. Background technique [0002] With the development of social economy and the continuous improvement of urbanization construction level, the construction of distribution network is advancing rapidly, there are more and more cable lines, and the cable grid is becoming more and more complex. With the increase of the cable base, the aging of lines, external force damage, natural factors, equipment quality and other reasons lead to an increase in the number of faulty lines every year, especially the number of single-phase ground fault lines has also increased significantly. [0003] The investigation of single-phase ground fault lines is very cumbersome. The current technical means mainly include the small current grounding line selection device of the substation, but the accu...

AI Technical Summary

Problems solved by technology

[0003] The investigation of single-phase ground fault lines is very cumbersome. The current technical means mainly include the small current grounding line selection device of the substation, but the accuracy of the device is not high. In the actual application process, experience is still used for trial selection. line, and even if the ground fault main line of the substation is judged very accurately, the specific 10kV switch station ground fault feeder cannot be judged, and emergency repair personnel are still required to go to the site for inspection and investigation, resulting in a long time for fault repair; another technical method is The temperature-measuring fault indicator installed at the end of the switchgear is used to judge the incoming line of the cabinet fault by sensing the temperature of the equipment, but the success rate of this device for single-phase ground fault detection is not high, because the 10kV cable network uses a small current In the grounding system, the grounding short-circuit current is not high, and the temperature generally does not increase sharply. In addition, even if the fault is successfully detected, it cannot be remotely transmitted to the background. It is still necessary for the emergency repair personnel to visit the equipment before they will find that the emergency repair personnel rush to the scene for inspection

The trial line selection currently being processed may cause power outages on normal lines and reduce the reliability of power supply; on-site inspections require manpower and material resources, and require on-site repair personnel to have a high professional level and be able to carry out according to on-site conditions and dispatching instructions Comprehensive fault analysis and judgment

In this emergency repair method, the evaluation and investigation takes a long time, which reduces the reliability of power supply and affects user satisfaction

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