Determination method of partial discharge UHF signal start time based on difference energy function
An energy function, partial discharge technology, applied in the direction of testing dielectric strength, etc., can solve the problem of signal time difference error, error, etc., to achieve the effect of reducing noise level, high accuracy, and reducing the impact of noise
Active Publication Date: 2018-01-19
XI AN JIAOTONG UNIV +2
View PDF12 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
When the noise of the UHF signal is large, the determined time difference of the signal has a large error; (2) When there is interference on the scene that distorts the waveform of the UHF signal, the time difference of the UHF signal will also be determined by using the above method large error
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
[0041] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings and embodiments.
[0042] Such as figure 1 As shown, the method for determining the initial moment of the partial discharge UHF signal based on the difference energy function of the present invention includes the following steps:
[0043] (1) Install UHF sensors on the tested equipment, and use high sampling rate digital detection equipment to collect and record UHF signal waveforms generated by partial discharge;
[0044] As an example, figure 2 A substation partial discharge detection experimental system based on a UHF sensor array built for the present invention, the system is composed of 4 omnidirectional sensors and digital acquisition equipment, and the 4 sensors are located at the four vertices of the rectangle; using portable UHF The signal generator radiates UHF signals into the space, and the sensor is a disk-cone omnidirectional...
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 discloses a method for determining the initial moment of a partial discharge UHF signal based on a differential energy function. Record the UHF signal waveform generated by partial discharge; (2) calculate the cumulative energy function of the UHF signal waveform generated by partial discharge; (3) optimize the length WL of the selected data window, and calculate the accumulated cumulative energy by sliding from the first data window The difference energy function of the energy function; (4) determine the moment corresponding to the first significant peak value of the difference energy function, and use it as the starting moment of the UHF signal. The difference energy function in the present invention can strengthen the fast-growing position of the accumulated energy and weaken the slow-growing part of the accumulated energy. White noise and low-frequency (<1GHz) narrow-band noise in UHF signals correspond to slowly increasing positions of accumulated energy, so the difference energy function can effectively reduce the level of white noise and narrow-band white noise.
Description
Technical field: [0001] The invention relates to the field of partial discharge detection of power equipment, in particular to a method for determining the initial moment of a partial discharge UHF signal based on a difference energy function. Background technique: [0002] Partial discharge is one of the main causes of major accidents in power equipment. Quickly and accurately locating the source of partial discharge is crucial to the maintenance of power equipment and the safe operation of the power system. Partial discharge monitoring is of great significance to the safe operation of power equipment. Because the UHF method has the advantages of high detection sensitivity, high signal-to-noise ratio, and the ability to locate partial discharge sources, it has been widely used in partial discharge detection of power equipment, and the location of partial discharge sources is one of the research hotspots. . [0003] Due to the complex structure of large equipment such as g...
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
Inventor 邓军波朱明晓张家宁张冠军刘孝为郭安祥刘子瑞
Owner XI AN JIAOTONG UNIV