On-line monitoring device for parasitic loop of same-section bus based on AC leakage current sensor

Abstract

The invention discloses an on-line monitoring device for parasitic loops of the same busbar based on an AC leakage current sensor, which belongs to the technical field of parasitic loop monitoring. The on-line monitoring device for parasitic loops of the same busbar based on an AC leakage current sensor can realize effective consideration of the same busbar Parasitic loop on-line monitoring requirements and high-sensitivity insulation monitoring requirements, through the use of directional AC leakage current sensors, the judgment process of equal waveform amplitude and opposite direction can be realized, which can effectively improve the accuracy of parasitic loop judgment. The marking of time greatly reduces the amount of calculation, simplifies the calculation amount of software judgment, and further improves the accuracy of parasitic loop judgment. Moreover, the present invention also performs parasitic loop review, which greatly reduces the frequency of false alarms caused by interference, and solves the problem of The problem of frequent false alarms caused by interference signals in the existing parasitic loop judgment method.

Description

technical field [0001] The invention relates to the technical field of parasitic loop monitoring, and more specifically relates to an on-line monitoring device for parasitic loops of the same busbar based on an AC leakage current sensor. Background technique [0002] The safe operation of the DC system is the guarantee of the protection and control system of the substation and the lifeline for the relay protection equipment to play a normal role. Its importance is self-evident. A major hidden danger in the DC system is the parasitic loop. [0003] The degree of harm of the parasitic circuit is very large. If it is light, it will make the equipment run in an abnormal working state, and provide wrong information for the operator, which will bring difficulties to normal operation and fault handling; if it is serious, it will cause relay protection to malfunction or refuse It can lead to large-scale power outages and even equipment damage. There are many reasons for the parasi...

AI Technical Summary

Problems solved by technology

[0019] "An Integrated Monitoring Device for Monitoring Parasitic Circuits of Substation DC Systems" and "A Method for Detection of Parasitic Circuits of Substation DC Systems" both rely on disconnecting a certain power supply to accurately determine whether there is a parasitic circuit, and online monitoring cannot be achieved

[0020] "A Device for On-Line Detection of Parasitic Loops in DC System" can monitor parasitic loops online, but it can only monitor parasitic loops between different sections of busbars, not the same section of busbars.

[0021] "A Device and Method for Detecting Parasitic Circuits in DC Systems", although it can be an online monitoring device for parasitic circuits, frequent misoperations are found during the application process, and false alarms will occur as long as the screen cabinet shakes slightly

Images