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

Distance protection method suitable for same-tower four-circuit line cross-voltage-class cross-line fault

A return line and cross-voltage technology, which is applied in the field of distance protection for level-cross-line faults, can solve the problem of inability to judge cross-voltage level and cross-line faults, and achieve the effect of effective judgment and improved calculation method.

Active Publication Date: 2019-03-29
TIANJIN UNIV +1
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a distance protection method suitable for cross-voltage grade and cross-line faults of four-circuit lines on the same tower, so as to overcome the problem that traditional distance protection methods cannot judge cross-voltage grade cross-line faults, and can effectively judge mixed voltage on the same tower Cross-voltage level and cross-line faults of four-circuit lines

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
  • Distance protection method suitable for same-tower four-circuit line cross-voltage-class cross-line fault
  • Distance protection method suitable for same-tower four-circuit line cross-voltage-class cross-line fault
  • Distance protection method suitable for same-tower four-circuit line cross-voltage-class cross-line fault

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] A typical mixed-voltage four-circuit transmission line on the same tower is composed of two sets of double-circuit lines with different voltage levels paralleled, and each set of double-circuit lines has a common bus at both ends, such as figure 1 . When the lines are completely transposed, the impedance parameters of each group of double-circuit lines are the same, and the self-impedance of the high-voltage class lines I and II and the low-voltage class lines III and IV are respectively Z SU ,Z SE , the phase-to-phase mutual impedances are Z MU ,Z ME , the positive sequence impedances are Z U1 = Z SU -Z MU ,Z E1 = Z SE -Z ME .

[0047] The mutual inductance between lines of a typical mixed-pressure four-circuit line on the same tower under ideal transposition is as follows: figure 2 . Z U1 ,Z E1 are the positive-sequence impedances of high-voltage and low-voltage lines, respectively. Z MU ,Z ME are the phase-to-phase mutual impedances of the high-volta...

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 distance protection method suitable for a same-tower four-circuit line cross-voltage-class cross-line fault. The method comprises the following steps: acquiring the voltageand current in each phase of each circuit line in a same-tower mixed-voltage four-circuit line; determining a faulted line and a faulted phase in the same-tower mixed-voltage four-circuit line by aphase selection component; calculating the fault interphase cross-voltage-class cross-line impedance, and determining the positive sequence impedance used for protection setting; determining a distance protection setting value, and determining a distance protection operation logic by comparing the calculated the cross-voltage-class cross-line impedance with the distance protection setting value.

Description

technical field [0001] The invention relates to the field of power system protection and control, in particular to a distance protection method suitable for cross-voltage level cross-line faults of four-circuit lines on the same tower. Background technique [0002] In order to cope with the tense situation of power supply and the decreasing number of transmission corridors, the construction conditions of the transmission network are becoming more and more complex. The multi-circuit power transmission technology on the same tower requires narrow outlet corridors due to the sharing of pole towers, which can make full use of limited corridor resources and reduce the area occupied by land. Modern power systems have requirements for power supply reliability and large-capacity power transmission. [0003] The promotion of power transmission on the same tower has also brought huge challenges to the fault analysis and relay protection of the power system. Due to the mutual inducta...

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): H02H7/26
CPCH02H7/267
Inventor 李斌王文博姚斌
Owner TIANJIN 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