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

Transmission line fault detection method based on two-dimensional space of current-current derivative

A transmission line and fault detection technology, which is applied in the direction of detecting faults, fault locations, and information technology support systems according to conductor types.

Active Publication Date: 2020-09-15
SOUTHWEST JIAOTONG UNIV
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a transmission line fault detection method based on the current-current derivative two-dimensional space, which can effectively solve the problem of fault detection of transmission lines in the case of high-resistance grounding faults, information asynchronous, etc.

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
  • Transmission line fault detection method based on two-dimensional space of current-current derivative
  • Transmission line fault detection method based on two-dimensional space of current-current derivative
  • Transmission line fault detection method based on two-dimensional space of current-current derivative

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] The technical content of the present invention is described in detail below in conjunction with accompanying drawing and specific embodiment:

[0039] figure 1 The flow chart of the transmission line fault detection method based on the current-current derivative two-dimensional space provided by the present invention, the embodiment

[0040] Using the electromagnetic transient simulation software PSCAD / EMTDC to build IEEE39 node system, the system structure diagram is as follows figure 2 shown. figure 2 The circled G in the middle represents the generator, and the serial numbers 1 to 39 are the numbers of each busbar. The system voltage level is 345kV, the frequency is 50Hz, and the sampling frequency is 10kHz, that is, the time difference between two adjacent sampling moments is 0.0001s. Set the fault in the IEEE39 node system, extract the corresponding fault data, and program in MATLAB to realize the fault detection method.

[0041] In the IEEE39 node system, the...

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 transmission line fault detection method based on the current-current derivative two-dimensional space. Collect the current on both sides of the transmission line, start the fault detection according to the conventional sudden change current, calculate the current derivative at each moment of the quarter cycle after the original sudden change time, count the number of current derivatives greater than 0 or less than 0, and determine the two sides of the line During this period of time, the current derivative is in the quadrant of the current-current derivative two-dimensional space, check and determine the real sudden change time t 1 and the real end time t of the quarter period 2 , for t 1 to t 2 The current derivative at each moment is calculated to obtain the quadrant satisfaction rate on both sides, and the quadrant of the current derivative in the first quarter cycle after the sudden change of the current on both sides is accurately judged, and then the fault condition of the line is detected. The invention can accurately detect line faults under various fault scenarios, is not affected by transition resistance, does not require high synchronization of currents on both sides, and has strong anti-synchronization capability.

Description

technical field [0001] The invention relates to the technical field of fault detection of power grid transmission lines. Background technique [0002] At present, most of the existing protection algorithms use the Fourier algorithm, and the current signals of each phase are used for current protection, and can participate in the calculation of the directional element, but the current protection is easily affected by the transition resistance, and the directional element has a certain dead zone, which is affected by The influence of signal synchronization on both sides. [0003] Aiming at the shortcomings of existing current protection algorithms, the present invention proposes a transmission line fault detection method based on the current-current derivative two-dimensional space. Its advantage is that by using the current sampling values ​​of each phase on both sides of the line, the fault line can be accurately detected about 1 / 4 cycle after the fault occurs, and the amou...

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): G01R31/08
CPCG01R31/086Y04S10/52
Inventor 童晓阳
Owner SOUTHWEST JIAOTONG 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