New method for distance protection surge lock of high voltage output line

A high-voltage transmission line and oscillation blocking technology, which is applied to emergency protection circuit devices, electrical components, fault locations, etc., can solve problems such as failure to block protection and failure to measure the size of the oscillation cycle in real time

Active Publication Date: 2008-09-17
北京衡天北斗科技有限公司
View PDF0 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The same disadvantage of this method is that the size of the oscillation period is not measured in real time, so the setting value of the action time difference can only be set according to the shortest oscillation period. At this time, if a fault occurs, the protection device can only trip with a delay determined by the previous method.
The traditional distance protection in operation now uses the same method to realize oscillation blocking regardless of the length of the line, which is also a big disadvantage.

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
  • New method for distance protection surge lock of high voltage output line
  • New method for distance protection surge lock of high voltage output line
  • New method for distance protection surge lock of high voltage output line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] figure 1 Diagram illustrating the work of "big circle with small circle" oscillation locking

[0043] The small circle C in the figure 1 It is the action characteristic circle of distance II, and its diameter OY is the set impedance Z of distance II Y2 , great circle C 2 with Madoka C 1 For concentric circles. Its diameter is 1.5Z Y2 , circle C 2 After 1.25Z Y2 and -0.25Z Y2 The ends of the two vectors. The straight line O in the figure 1 o 2 When the system oscillates, it is the oscillation center point, which is to measure the motion track of the end of the impedance Z vector. It can be seen that the trajectory is moving along a diameter of the circle, so it passes through the small circle C 1 The maximum time ratio with the time outside the small circle inside the big circle is 4.

[0044] figure 2 It is a diagram illustrating the work of the large quadrilateral covering the oscillation locking of the small quadrilateral. The small quadrilateral A in ...

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 present invention provides a blocking method of distance protection swing of a high voltage transmission line, the swing blocking technique in the high voltage transmission line distance protection has always been one of the focus discusses. The technical scheme of the invention has two swing blocking methods having different principles, automatically selecting one swing blocking method according the length of the protection line. When the protection judgement is a short line, periodic oscillation change rate and the position of the apparent impedance are real-time detected by a stackable counter, the dwell is relatively adjusted and the relieved, the method is not only applied to the great round covering the small round type operation characteristics, but also applied to the great quadrilateral covering the small quadrilateral type operation characteristics; when the protection judgement is a long transmission line, the swing blocking pattern fpr detecting Ucos fai and its change rate is utilized. Two patterns is automatically switched by the command set in a microcomputer software program, according to the size of the setting impedance.

Description

technical field [0001] The present invention relates to an important field of safe and stable operation of electric power system—relay protection technology of high-voltage transmission lines, in particular to a blocking method for distance protection oscillation of high-voltage transmission lines. Background technique [0002] Oscillation blocking technology in distance protection of high-voltage transmission lines has always been one of the focus issues. The so-called oscillation blocking technology not only requires that the distance protection can be reliably blocked to prevent misoperation when the system oscillates, but also must be released immediately when a fault occurs during the oscillation process to allow the distance relay to trip. Two methods of oscillation blocking have been widely used so far: one is to delay the action of the protection, and the other is to check the change speed of the electrical quantity. [0003] According to the analysis of Document 1 ...

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 朱声石马师模朱庆翔
Owner 北京衡天北斗科技有限公司
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