Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Fault direction judgment method based on positive-sequence polarization voltage phase comparison

A polarization voltage and phase comparison technology, which is applied in the direction of fault location, measurement of electricity, and measurement of electrical variables, can solve the problems of inability to correctly judge the fault direction and unfixed distributed power output, and achieve reliable operation, stable operation, and durability. Affected by strong transition resistance capability

Active Publication Date: 2014-10-01
SHANDONG UNIV
View PDF6 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This directional element can only be applied to transmission lines with unidirectional power flow. For distribution lines with distributed power sources, since the output of distributed power sources is not fixed, the power flow distribution will often change, resulting in the directional element being unable to correctly judge the fault direction.

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
  • Fault direction judgment method based on positive-sequence polarization voltage phase comparison
  • Fault direction judgment method based on positive-sequence polarization voltage phase comparison
  • Fault direction judgment method based on positive-sequence polarization voltage phase comparison

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] 1. Performance analysis of directional components when a positive direction fault occurs

[0031] when figure 1 When a fault occurs in the F1 position, the working voltage U op with the measured voltage U m The relationship between figure 2 As shown, the directional element on the right side of the M bus belongs to the positive direction fault.

[0032] In a double-terminal power system, when a fault occurs in the forward direction, the phases before and after the positive-sequence voltage fault are basically the same, and it can be approximately considered that the positive-sequence polarization U m1 The phase is equal to the bus voltage U before the fault m(0) phase, while U m(0) The phase is equal to the system supply voltage E 1 phase, so:

[0033] arg ( U o...

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

A fault direction judgment method based on positive-sequence polarization voltage phase comparison includes the steps that the measuring voltage Um, the measuring current Im and the bus positive-sequence voltage Um1 at the installation position of a directional element are respectively acquired after a smart distribution network breaks down; a working voltage Uop is set; the direction of the fault is judged. The fault direction judgment method has the advantages that due to limitation of the minimum value, it can be guaranteed that correct actions can be carried out when a short circuit occurs at the tail end of the protection range due to the resistance smaller than the largest transition resistance, and the reverse-direction fault can be judged with high reliability. The fault direction judgment method has the advantages that a voltage dead area does not exist, the capacity for resisting transition resistance is high, the working characteristics are stable, and influences cannot be caused by large changes of the operating mode of a power distribution network system or obvious difference between distributed power supplies or complex load types or other working conditions.

Description

technical field [0001] The invention relates to the field of electric power system relay protection, in particular to a method for judging the fault direction of an intelligent distribution network based on positive sequence polarization voltage phase comparison. Background technique [0002] In recent years, a large number of distributed power sources of different types and capacities have been connected to the distribution network. The improvement of the access level has made the short-circuit current output by the distributed power source sufficient to cause the protection action in the event of a fault, and only rely on the fixed value to ensure the overcurrent Alternative protection schemes cannot meet the requirements of new situations. It is an effective way to solve this problem by configuring the fault direction element on the basis of the original protection, and deciding whether to block or open the protection according to the judgment result of the fault directio...

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): G01R31/08G01R31/02
Inventor 丛伟田崇稳王慧史方芳房凡秀鲍乐马龙王瑞
Owner SHANDONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com