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

Remote ultra-high voltage alternating-current transmission line fault determination method

A technology for UHV AC and transmission lines, which is applied to fault locations, emergency protection circuit devices, electrical components, etc., and can solve problems such as extended time, inability to meet the requirements for quick action of relay protection, and large data windows

Active Publication Date: 2014-10-08
STATE GRID PUTIAN ELECTRIC POWER SUPPLY +3
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some of the transmission line traveling wave differential protection methods even require wavelet transform, which requires a large data window, which prolongs the time for protection to detect faults, and cannot meet the requirements of relay protection for quick action.

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
  • Remote ultra-high voltage alternating-current transmission line fault determination method
  • Remote ultra-high voltage alternating-current transmission line fault determination method
  • Remote ultra-high voltage alternating-current transmission line fault determination method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The technical solution of the present invention will be further described in detail below according to the drawings of the specification.

[0023] figure 1 It is a schematic diagram of a UHV AC power transmission system applying the method of the present invention. This embodiment first collects the three-phase voltage traveling wave component and the three-phase current traveling wave component at each sampling time of the UHV AC transmission line at the protection installation of the m substation; collects each sampling of the UHV AC transmission line at the protection installation of the n substation The three-phase voltage traveling wave component and the three-phase current traveling wave component at the moment.

[0024] Phase-to-mode conversion is used to convert the three-phase voltage traveling wave component and three-phase current traveling wave component at each sampling time of the m and n substation protection installation into 0, α, β mode voltage traveling ...

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 remote ultra-high voltage alternating-current transmission line fault determination method. The method comprises the steps that voltage and current travelling wave components at each sampling moment at protection installation positions at the two ends of an ultra-high voltage alternating-current transmission line are collected at first, the influence of line losses is calculated, the travelling wave electrical quantity at each sampling moment is utilized for calculating the current travelling wave component at one end of the ultra-high voltage alternating-current transmission line through a prediction algorithm, then a distributed capacitance current along the ultra-high voltage alternating-current transmission line is used as a braking current, the vector sum of the current travelling wave component, obtained through calculation, at one end of the ultra-high voltage alternating-current transmission line and the current travelling wave component, obtained through sampling, at the end of the ultra-high voltage alternating-current transmission line is used as a difference current, and phase splitting is carried out to form main protection of the ultra-high voltage alternating-current transmission line. According to the remote ultra-high voltage alternating-current transmission line fault determination method, the current travelling wave components at each sampling moment does not need to be solved through interpolation operation, the operand of current travelling wave protection is reduced, the movement speed of current travelling wave differential protection is improved, and the remote ultra-high voltage alternating-current transmission line fault determination method is applicable to ultra-high voltage alternating-current transmission line replay protection under different operating environments and circuit parameters.

Description

Technical field [0001] The invention relates to the technical field of power system relay protection, in particular to a method for judging the fault of a long-distance UHV AC transmission line. Background technique [0002] Because it is not affected by system operation mode and grid structure and has a natural phase selection function, current differential protection has always been the main protection for transmission lines of various voltage levels. In the 220kV and below voltage level transmission lines, because the distributed capacitance current along the transmission line is very small, the distributed capacitance has little effect on the performance of the current differential protection. However, the voltage and current transmission of UHV AC transmission lines have obvious wave processes, and the distributed capacitive current along the line is very large. The traditional current differential protection that uses the vector sum of the fundamental frequency steady-state...

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 Applications(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 曾惠敏
Owner STATE GRID PUTIAN ELECTRIC POWER SUPPLY
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