A Method for Detecting Defects of Switchgear Based on Transient Ground Voltage and UHF
A transient ground voltage and detection switch technology, which is applied in the field of power switch cabinets, can solve the problem of losing low frequency bands, and achieve the effects of improving accuracy, reducing error, and improving accuracy
Active Publication Date: 2020-07-28
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +3
View PDF11 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Since the frequency of corona interference on site is mainly concentrated below 300MHz, the UHF method can effectively avoid corona interference and has high sensitivity and anti-interference ability, but it also has certain limitations, such as losing the low frequency band of partial discharge, Unable to quantify the game
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0022] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:
[0023] A method for detecting switchgear defects based on transient ground voltage and UHF, such as figure 1 shown, including the following steps:
[0024] Step 1. Use the transient ground voltage detection method and the ultra-high frequency detection method to detect the three defect models of the switchgear defect, and obtain the corresponding phase-amplitude diagram and pulse current waveform diagram respectively.
[0025] In this embodiment, the three types of defects in the switchgear are needle plate, air gap and suspension defects.
[0026] Step 2, using fractal theory to extract the characteristic parameters of the phase-amplitude diagram obtained by the transient ground voltage detection method and the UHF detection method.
[0027] The characteristic parameters of amplitude-phase are related parameters of the collected boundary volume,...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a method for detecting a switchgear defect based on transient ground voltage and ultrahigh frequency. The method comprises the steps of detecting a switchgear by means of a transient ground voltage detecting method and an ultrahigh frequency detecting method respectively, thereby respectively obtaining a corresponding phase-amplitude graph and a pulse current oscillogram;obtaining the characteristic parameter of the phase-amplitude graph; identifying the characteristic parameter of the amplitude-phase point graph of a partial discharge signal by means of an artificialneural network; matching the characteristic graph of the discharge pulse waveform by means of a sift characteristic algorithm; and respectively generating the amplitude-phase point graphs of the partial discharge signal, the result of the partial discharge pulse waveform, a suggested result and reliability thereof according to the two methods according to the weights of the two methods. Accordingto the method of the invention, the transient ground voltage detecting method and the ultrahigh frequency detecting method are combined; through performing determination according to the amplitude-phase point graph and the partial discharge pulse waveform of the partial discharge signal, an artificial error caused by individual differences can be effectively reduced, and identification accuracy is improved.
Description
technical field [0001] The invention belongs to the technical field of electric switch cabinets, in particular to a method for detecting defects of switch cabinets based on transient ground voltage and ultra-high frequency. Background technique [0002] When the power switchgear is operated for a long time or under the condition of high temperature and overload operation, partial discharge phenomenon will appear in different degrees. Long-term partial discharge may aggravate insulation aging, lead to insulation breakdown, and affect the normal operation of the switchgear. In severe cases, it will cause the switchgear to explode, cause power outages for users, affect the reliability of power supply in the distribution network, and even cause serious accidents. [0003] Switchgear partial discharge detection can effectively avoid insulation accidents. The commonly used detection methods for partial discharge include: ultra-high frequency detection method (UHF), ground electri...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/1227
Inventor 何金黄猛徐轩王永宁张弛韩秋波曹梦张春晖陈荣张黎明宋晓博朱旭亮
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO