Distribution network single-phase grounding section positioning method based on fault phase voltage and current abrupt change

A technology of current mutation and fault phase voltage, which is applied in the direction of fault location, measurement of electrical variables, and detection of faults according to conductor types, can solve problems that cannot be applied on a large scale, and achieve strong practical effects

Active Publication Date: 2016-08-10
XI AN JIAOTONG UNIV +2
View PDF7 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the positioning method of the single-phase grounding section of the distribution network basi...

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
  • Distribution network single-phase grounding section positioning method based on fault phase voltage and current abrupt change
  • Distribution network single-phase grounding section positioning method based on fault phase voltage and current abrupt change
  • Distribution network single-phase grounding section positioning method based on fault phase voltage and current abrupt change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The present invention will be further described below in conjunction with the charts.

[0026] figure 1 In is a distribution network with N outgoing lines. When the switch K is opened, it is an ungrounded system, and when it is closed, it is a grounded system through an arc suppression coil. The outlet current of each outgoing line is Among them, J=1,2...N, representing the Jth line, Indicates the three phases a, b, and c, and the load current of each phase of each outgoing line is expressed as The relative ground capacitance of each outgoing line is C J , each phase-to-ground capacitive current of each outgoing line is When a phase-to-ground fault occurs on the Jth outgoing line, the zero-sequence voltage of the network is u 0 , the current at the fault point is i f , then the current mutation amount upstream of the fault point of the fault line fault phase is

[0027] Δi J A = ...

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 provides a distribution network single-phase grounding section positioning method based on fault phase voltage and current abrupt change. Fault phase voltage and current of each line section are measured, the phase with lower phase voltage is determined to be the fault phase, and the higher phase voltage is determined to be the sound phase. Under a certain frequency band, the fault phase current abrupt change of the downstream of the fault point of a fault wire and a sound wire is in positive correlation to the derivative of the phase voltage abrupt change, with the correlation coefficient greater than zero. The fault phase current abrupt change of the upstream of the fault point of the fault wire is in negative correlation to the derivative of the phase voltage abrupt change, with the correlation coefficient smaller than zero. The section positioning can be realized by determining the correlation coefficient between the phase current abrupt change and the derivative of the phase voltage abrupt change of each section. The method overcomes the defect that a conventional distribution network single-phase grounding section can be positioned through communication. No communication is needed, and the method is of a bootstrapping method and can solve the problem of positioning single-phase grounding section of a power distribution network.

Description

technical field [0001] The invention relates to the field of relay protection of power systems, in particular to a positioning method for a single-phase grounded section of a distribution network. Background technique [0002] The distribution network has a high probability of single-phase-to-earth faults. When a single-phase ground fault occurs in the distribution network, the line voltage between the three phases is still symmetrical, and the fault current is small, which will not affect the power supply of the load, and there is no need to trip immediately. The regulations stipulate that it can continue to run for 1-2h, but in order not to cause Fault expansion requires the ability to select the fault line and locate the faulty section to eliminate the fault as soon as possible. This problem has not been well resolved all the time. With the construction of my country's smart grid, the intelligent construction of the distribution network, as a link directly connected wit...

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
CPCG01R31/086G01R31/088
Inventor 宋国兵常仲学黄炜郭上华张维张恒泰
Owner XI AN JIAOTONG 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