Method of locating discharge source for GIS ultrahigh frequency partial discharge online monitoring device

Abstract

The invention discloses a method of locating a discharge source for a GIS ultrahigh frequency partial discharge online monitoring device. At present, the ultrahigh frequency partial discharge on-line monitoring device cannot use the time difference between the signals to achieve the precise location of the partial discharge source because the processing sampling rate of the detected peak signal of the ultrahigh frequency partial discharge on-line monitoring device is low. The method uses the GIS ultrahigh frequency partial discharge on-line monitoring device to collect the ultrahigh frequency signal of the GIS equipment, uses the Gaussian smoothing filtering method to extract the envelope of each ultrahigh frequency signal, calculates the time domain cumulative energy function of each ultrahigh frequency envelope signal and performs the normalized processing, calculates the inflection point of the normalized time domain cumulative energy function curve as the signal energy sudden time, i.e., the signal start time, calculates the difference value between the start times of the respective signals, and uses the discharge source positioning formula to calculate the discharge source position. The method can directly use the low sampling signal of the GIS ultrahigh frequency partial discharge on-line monitoring device to perform time difference positioning.

Description

technical field [0001] The invention relates to the field of electrical engineering, in particular to a method for locating a discharge source of a GIS ultra-high frequency on-line monitoring system. Background technique [0002] Gas Insulated Switchgear (GIS for short) occupies an important position in the power transmission and transformation system due to its advantages of compact structure, no influence from the external environment, and long maintenance cycle. [0003] Operation experience shows that due to problems such as assembly process, manufacturing materials, transportation, and aging of GIS, there are often multiple or multiple defects inside it. With the increase of the service life, its internal defects are gradually serious. Under the inducement of large current and overvoltage, it may cause insulation breakdown or flashover fault, forming a large area of ​​power outage accidents, causing huge economic losses and bad social conditions. influences. There hav...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problem that the existing GIS ultra-high frequency partial discharge on-line monitoring device cannot use the time difference between low sampling signals to realize the precise positioning of the partial discharge source, and to provide a GIS ultra-high frequency partial discharge on-line monitoring device. Discharge source positioning method, which can directly use the low sampling signal of GIS UHF partial discharge on-line monitoring device for time difference positioning, and realize the accurate positioning of partial discharge source

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