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

Acceleration method for zero sequence inverse time limit overcurrent protection of adjacent lines in one-tower two-circuit lines

An overcurrent protection and line protection technology, applied in the field of zero-sequence inverse-time overcurrent protection and accelerated protection of the transmission network, can solve the problems of difficulty in implementation, high cost, and difficulty in popularization and application, and achieves clear principles, low cost, and avoidance of The effect of protection against misoperation

Active Publication Date: 2017-05-10
SHANDONG UNIV
View PDF0 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned scheme can adjust the action time of protection according to the actual situation, but it needs to use wide-area information, which is difficult to implement and costly, and it is difficult to popularize and apply in the actual field

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
  • Acceleration method for zero sequence inverse time limit overcurrent protection of adjacent lines in one-tower two-circuit lines
  • Acceleration method for zero sequence inverse time limit overcurrent protection of adjacent lines in one-tower two-circuit lines
  • Acceleration method for zero sequence inverse time limit overcurrent protection of adjacent lines in one-tower two-circuit lines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] The present invention is described in detail below in conjunction with accompanying drawing:

[0034] The invention discloses a zero-sequence inverse time-limit overcurrent protection method oriented to the structure of double-circuit lines on the same pole, that is, an anti-misoperation cooperation method for changing the time setting coefficient, including:

[0035] (1) Obtain the zero-sequence impedance values ​​of the lines on both sides of the double-circuit line on the same pole, respectively, and calculate the critical fault position α corresponding to whether the adjacent line protection malfunctions according to the obtained zero-sequence impedance values;

[0036] The method of determining the critical fault location α is:

[0037] Record the zero-sequence impedance value of the left system of the double circuit line on the same pole as Z L , the zero-sequence impedance value of the right system is denoted as Z R , the critical fault location α is:

[0038]...

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 an acceleration method for zero sequence inverse time limit overcurrent protection of adjacent lines in one-tower two-circuit lines. The method includes calculating a critical failure position of false action of adjacent line protection according to an obtained zero sequence impedance value; calculating zero sequence inverse time limit protection zero sequence current flowing through the two ends of a failure line when a failure occurs at the critical failure position and calculating the action time of failure line two end protection; calculating the action time of protection of adjacent lines on two sides of the two-circuit lines by adding a time delay to the action time of failure line two end protection; solving a time setting coefficient of protection of adjacent lines on two sides of the two-circuit lines after a setting process. The invention also discloses a zero sequence current change based acceleration scheme for zero sequence inverse time limit overcurrent protection of the adjacent lines. The invention has beneficial effects that prior performance of inverse time limit protection is not affected; and normal action of zero sequence inverse time limit protection is enabled when a prior acceleration scheme cannot work due to different reasons, so that failure elimination reliability is ensured.

Description

technical field [0001] The invention relates to the field of relay protection of electric power systems, in particular to a method for preventing maloperation and an acceleration protection method for zero-sequence inverse time-limit overcurrent protection of a transmission network oriented to a double-circuit line structure on the same pole. Background technique [0002] Zero-sequence inverse time overcurrent protection has the unique advantage of inverse time limit, that is, the current flowing through the protection installation is inversely proportional to the protection action time, so it can obtain higher sensitivity when used as backup protection, and its application in high-voltage power grids is also increasing. widely. When a ground fault occurs in the power system, the zero-sequence equivalent power supply is located at the fault point. The farther the distance from the fault point is, the smaller the zero-sequence current flows. Therefore, in general, the zero-se...

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): H02H7/26H02H3/093H02H3/32
CPCH02H3/093H02H3/32H02H7/26
Inventor 丛伟张子衿康奇豹肖静王安宁尹丰钊盛亚如孙梦晨张丽强胡亮亮
Owner SHANDONG 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