Supercharge Your Innovation With Domain-Expert AI Agents!

Method for zero-sequence directional element blocking of double-circuit line without transposition on the same tower

A zero-sequence direction, double-circuit technology on the same tower, applied in the field of power system to avoid incorrect action and improve action performance

Inactive Publication Date: 2018-01-23
STATE GRID CORP OF CHINA +2
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual operation of the project, it often occurs that the double-circuit line without transposition on the same tower will cause incorrect action of the longitudinal direction protection caused by the zero-sequence directional element misstarting

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
  • Method for zero-sequence directional element blocking of double-circuit line without transposition on the same tower
  • Method for zero-sequence directional element blocking of double-circuit line without transposition on the same tower
  • Method for zero-sequence directional element blocking of double-circuit line without transposition on the same tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0024] Such as figure 1 As shown, a method for blocking zero-sequence directional elements of double-circuit lines on the same tower without transposition includes the following steps:

[0025] Steps to extract the components of the positive sequence current, negative sequence current and zero sequence current of the protected line after the pilot zero sequence direction protection device is activated;

[0026] The step of determining the relationship between the ratio of the zero sequence current component to the positive sequence current component and the threshold value k1;

[0027] When the ratio of the above zero sequence current component to the positive sequence current com...

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 discloses a method for blocking zero-sequence directional elements of a double-circuit line without transposition on the same tower, which includes extracting the positive-sequence current, negative-sequence current and zero-sequence current of the protected line after the longitudinal zero-sequence protection device is started. Sequence current component; determine the relationship between the ratio of the above-mentioned zero-sequence current component to the positive-sequence current component and the threshold value k1; when the ratio of the above-mentioned zero-sequence current component to the positive-sequence current component is less than the threshold value The relationship between the ratio of the positive sequence current component and the threshold value k2, when the ratio of the above negative sequence current to the positive sequence current component is less than the threshold value k2, it is judged as a ground fault, and the zero sequence directional element is opened; when the negative sequence current and the positive sequence If the ratio of the current components is greater than the threshold value k2, it is judged as an ungrounded fault between phases, and the zero-sequence directional element is blocked. Realize the purpose of correctly distinguishing the grounding fault and the phase-to-phase fault of the double-circuit line without transposition on the same tower.

Description

Technical field [0001] The invention relates to the field of power systems, and in particular to a method for blocking zero sequence directional elements of double-circuit lines on the same tower without transposition. Background technique [0002] At present, the longitudinal zero-sequence directional protection is one of the main protections of transmission lines, which has the advantages of high sensitivity and stable zero-sequence fault network structure. When a ground fault occurs in the transmission line, the zero-sequence directional element is activated when the zero-sequence current and zero-sequence voltage at the protection installation reach the threshold value, and the zero-sequence direction is judged. When the zero-sequence directional components on both sides of the transmission line are judged to be faults in the positive direction, the protection action will trip. [0003] For uniformly transposed transmission lines, the three-phase parameters are symmetrical, an...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 范雪峰付兵彬徐昊亮田云飞余泳杨晶冯东民靳攀峰陈兆雁
Owner STATE GRID CORP OF CHINA
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com