Resonant earthed system fault line selection method utilizing fuzzy K-means clustering

A technology of resonant grounding and system faults, applied in the fault location and other directions, can solve the problems of lack of research, inability to achieve intelligent fault line selection, high resistance grounding faults, and short line faults that are difficult to accurately select lines.

Inactive Publication Date: 2014-07-23
FUZHOU UNIV
View PDF6 Cites 35 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the line selection criteria used in the existing resonant grounding system fault line selection method adopt the manual experience threshold method, which cannot achieve intelligent fault line selection; and it is difficult to accurately sel

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Resonant earthed system fault line selection method utilizing fuzzy K-means clustering
  • Resonant earthed system fault line selection method utilizing fuzzy K-means clustering
  • Resonant earthed system fault line selection method utilizing fuzzy K-means clustering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0080] When a single-phase ground fault occurs in a resonant grounding system, the transient zero-sequence current waveforms of non-fault lines have the same change trend, and the difference is only in the amplitude, so the transient zero-sequence current waveforms between non-fault lines are similar; For the fault line, the transient zero-sequence current of the fault line contains more DC components, and the non-fault line has almost no DC component, and the phase of the high-frequency component of the transient zero-sequence current of the fault line is opposite to that of the non-fault line, so the fault The transient zero-sequence current waveforms of lines and non-fault lines are quite different. Therefore, the present invention uses the method of identifying the similarity of transient zero-sequence current waveforms to select fault lines.

[0081] The fault line selection method of the resonant grounding system of the present invention, such as Figure 5 shown, includ...

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

No PUM Login to view more

Abstract

The invention relates to a resonant earthed system fault line selection method utilizing fuzzy K-means clustering. The resonant earthed system fault line selection method comprises the following steps of 1 performing stretching transformation treatment on transient-state zero-sequence current of each line to improve similarities of transient-state zero-sequence currents of non-fault lines; 2 dividing the transient-state zero-sequence currents of all of lines according to a certain time period, performing subsection phase plane transformation to obtain Euclidean distances from all of phase points of the transient-state zero-sequence current of each section to determinacy points x and y on a phase plane so as to extract local features of the transient-state zero-sequence currents of all of subsections and obtain feature matrixes of global features of all of lines; 3 performing normalization processing on elements in the feature matrixes to improve comparability; 4 utilizing a fuzzy K-means clustering method to perform clustering on the normalized feature matrixes, dividing the transient-state zero-sequence currents of all of lines into two categories and the lines independently included in one category are fault line. The method improves the automation degree and line selection margin.

Description

technical field [0001] The invention relates to the technical field of relay protection for intelligent power distribution systems, in particular to a fault line selection method for a resonant grounding system based on waveform stretching transformation and fuzzy K-means clustering. Background technique [0002] The resonant grounding system has the advantages of improving the power supply reliability of the system, reducing the accident rate of lightning damage, and resisting electromagnetic interference of communication equipment. It is widely used in medium-voltage distribution networks. The probability of single-phase grounding faults in resonant grounding systems is very high, generally accounting for more than 80% of the total faults. If it is an instantaneous ground fault, the fault can be eliminated by itself; if it is a permanent ground fault, the system can continue to operate for 1 to 2 hours without affecting the continuous power supply of the system. Because t...

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
no application Login to view more
IPC IPC(8): G01R31/08
Inventor 郭谋发郑新桃杨耿杰高伟缪希仁
Owner FUZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap