High voltage DC power transmission line shielding failure current waveform inversion recovery method

A transmission line and current waveform technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve the problems of difficult maintenance, difficulty in obtaining lightning parameters of the entire line corridor, and high cost

Inactive Publication Date: 2010-07-14
KUNMING UNIV OF SCI & TECH
View PDF0 Cites 37 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of measuring device is installed on the tower, which is expensive and difficult to maintain. Especially for long-distance transmission lines, it can only be installed selectively in the flashing section, and it is difficult to obtain the lightning parameters of the entire line corridor.
Also, due to the nature of measuring flashover current, such measurement methods will not work for lightning strikes on lines that did not cause flashover
The lightning location system has been applied in 30 domestic provincial network companies. With the help of this system, the basic data of lightning current polarity and amplitude can be obtained, and then the lightning day, lightning hour, ground flash density, ground lightning density, and ground flash Frequency, lightning current amplitude probability dis

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
  • High voltage DC power transmission line shielding failure current waveform inversion recovery method
  • High voltage DC power transmission line shielding failure current waveform inversion recovery method
  • High voltage DC power transmission line shielding failure current waveform inversion recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0075] When a lightning fault occurs on a HVDC transmission line, the above-mentioned principle can be used to realize the inversion and recovery of the lightning shielding current waveform of the HVDC transmission line.

[0076] Specific steps are as follows:

[0077] 1) When the voltage change rate du / dt is greater than the set value, the high-speed data acquisition and recording device with a sampling frequency of 1MHz at the M and N side protection installations of the line starts and records the voltage traveling wave waveform of 5ms after the failure;

[0078] 2) Use Karenbauer transformation to calculate the transient voltage line modulus U on the M side and N side obtained at the protection installations on both sides of the line M (t), U N (t) and the zero mode component U M0 (t), U N0 (t), as shown in formula (19):

[0079] U M ( t ) = 1 2 ( U M + ( t ) - U M - ( t ) )

[0080] U M 0 ( t ...

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 relates to a high voltage DC power transmission line shielding failure current waveform inversion recovery method. When the transmission line suffers the lightning stroke, the transient state traveling wave is spread and transmitted by the power transmission line, so the transient response at the protection installation place is different. The transmission line is equivalent to a natural lightning current air-termination system, and when the shielding failure happens, the prior traveling wave fault location technology can precisely locate the lightning stroke point; the parameters of the power transmission line can be obtained by measuring and analyzing on line; and with the transfer function of the transmission line deduced by the method, the lightning current waveform at the lightning stroke point can be finally obtained by carrying out the phase amplitude transformation, noise reduction, and Prony fit process, and deconvolution operation of on the transient voltage which is obtained through a high-speed collection at the protection installation place of the transmission line.

Description

Technical field [0001] The invention relates to the technical field of lightning electromagnetic transient monitoring of electric power systems, in particular to a method for inversion and recovery of lightning shielding current waveforms of high-voltage direct current transmission lines. Background technique [0002] Lightning strikes are the main cause of line trips and power supply interruptions. The proportion of the total trip rate of transmission line lightning strikes increases as the voltage level increases. For UHV DC transmission lines, accidents caused by lightning strikes cannot be ignored. The Yunnan-Guangzhou UHV DC transmission project has a total length of 1438km and has been operated in unipolar and half voltage. The bipolar was completed in 2010. Since there is no similar engineering experience as a reference, it is difficult to prevent the line from being tripped by lightning. High altitude, variable weather, and frequent thunderstorm activities have caused th...

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): G01R19/00G01R31/08
Inventor 束洪春张广斌彭仕欣孙士云刘可真朱子钊朱盛强
Owner KUNMING UNIV OF SCI & TECH
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