Distance protection method for non-transposition double-circuit lines on same tower

A technology of double-circuit protection on the same tower and distance protection, which is applied in the direction of emergency protection circuit devices and electrical components, and can solve the problem that it is difficult to meet the backup protection requirements of double-circuit lines on the same tower without transposition in the high-voltage large power grid, and the hidden dangers of safe and stable operation of the power grid , beyond and other issues

Active Publication Date: 2014-12-31
XI AN JIAOTONG UNIV +1
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in engineering applications, for short-distance transmission lines or high-voltage especially ultra-high-voltage lines, due to technical and economic considerations, the line is often not completely transposed. At this time, the measured impedance of the protection is not only affected by the zero-sequence mutual inductance, but also Also affected by positive-sequence mutual inductance and negative-sequence mutual inductance, the distanc

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 for non-transposition double-circuit lines on same tower
  • Distance protection method for non-transposition double-circuit lines on same tower
  • Distance protection method for non-transposition double-circuit lines on same tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. Such as figure 1 As shown, the simulation model of the non-transposition 330kV / 100km double-circuit line on the same tower is given. The positive sequence impedance of the M-side system is 1.0914+j12.45Ω, the zero-sequence The system parameters are the same as those on the M side, and the double-circuit lines on the same tower are arranged according to the phase sequence IBCA-IICAB without transposition in the whole process. The six-phase impedance matrix is:

[0037] 0.075 + j 0.461 0.062 + j 0.141 0.058 + j 0.213 0.058 + ...

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 distance protection method for non-transposition double-circuit lines on the same tower. The method comprises the following steps of firstly, according to the existing fault phase selection method, accurately identifying the fault phase of the non-transposition double-circuit lines on the same tower; then, utilizing a six-phase impedance matrix obtained by an actual pole tower structure to calculate the average self-impedance, inter-phase mutual impedance, inter-line mutual impedance, and positive sequence impedance and zero sequence impedance of a virtual line; performing the fault calculation on the occurred fault type, and performing phase division and rectification on the protection area of each fault phase. The method has the advantage that the distance protection work of the non-transposition double-circuit lines on the same tower is controlled in the excellent state, and the important realistic meaning is realized for guaranteeing the safe and stable running of power systems.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to the technical field of relay protection for double-circuit lines on the same tower without transposition, in particular to a distance protection method for double-circuit lines on the same tower without transposition. Background technique [0002] At present, double-circuit lines on the same tower are widely used in high-voltage power grids, and distance protection, as one of the mainstream backup protections, plays an extremely important role in the safe operation of double-circuit lines on the same tower. There is zero-sequence mutual inductance between ideally transposed double-circuit lines on the same tower. Under this effect, the action range of grounding distance protection will exceed and shorten, which brings many practical engineering problems to relay protection. The problem of exceeding and shortening the action range of the grounding distance protection can be better solve...

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
Inventor 郝治国张世锋张军黄鸣宇晁光
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