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

A Traveling Wave Comprehensive Ranging Method Combining Impedance Method and Traveling Wave Method

A distance measurement method, a technology of traveling wave method, applied in the field of power system transmission line fault distance measurement, can solve problems such as network instability, time signal loss, and difficulty in identifying reflected waves

Active Publication Date: 2018-06-19
STATE GRID SHANDONG ELECTRIC POWER +2
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the distance measurement accuracy cannot meet the distance measurement requirements when relying solely on the impedance method in the transmission line of the power system, and is easily affected by factors such as transition resistance. It is difficult to identify reflected waves, and there are factors such as network instability and time synchronization signal loss during double-ended ranging. A comprehensive ranging method combining impedance method and traveling wave method is proposed, which avoids the simple traveling wave method. The false start phenomenon existing in the transmission line improves the reliability of transmission line fault location

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
  • A Traveling Wave Comprehensive Ranging Method Combining Impedance Method and Traveling Wave Method
  • A Traveling Wave Comprehensive Ranging Method Combining Impedance Method and Traveling Wave Method
  • A Traveling Wave Comprehensive Ranging Method Combining Impedance Method and Traveling Wave Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0065] Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings:

[0066] figure 1 It is a specific implementation flowchart of the present invention, and its specific implementation process is as follows:

[0067] The wave recording start judgment is carried out by monitoring the power frequency voltage and power frequency current of the transmission line. First of all, when the transmission line fails, the power frequency start-up will trigger the wave recording software module to perform wave recording operation of power frequency voltage, power frequency current data and high frequency current data, and obtain power frequency wave recording files and high frequency wave recording files;

[0068] Then the impedance method calculates the voltage and current in the power frequency recording file to obtain the impedance ranging length. The traveling wave method takes the fault line and fault time provided by the impedanc...

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 traveling wave integrated distance measuring method combining an impedance method with a traveling wave method, for oscilloscope determination through monitoring power frequency voltages and power frequency currents of a power transmission line. A power frequency oscilloscope file and a high-frequency oscilloscope file are generated in case of a fault in the power transmission line; by use of the impedance method, a fault line is obtained through determining a starting phase in the power frequency oscilloscope file, and an impedance distance measuring length is obtained through performing impedance analysis and calculation on power frequency voltage and power frequency current data; and by use of the travelling wave method, a travelling wave distance measuring length is obtained through performing travelling method distance measurement on high-frequency current oscilloscope data by taking the fault line and fault time provided by the impedance method as references. According to the invention, a travelling wave integrated distance measuring length is obtained through integrated analysis on the impedance distance measuring length and the travelling wave distance measuring length. Various distance measuring methods are combined so that the distance measuring reliability is guaranteed, and conditions of distance measurement failure are reduced.

Description

technical field [0001] The invention relates to the field of distance measurement of transmission line faults in power systems, especially in power transmission networks with high voltage, long distance, complex terrain and difficult line inspection, which can correctly judge faulty lines and accurately locate fault points. Background technique [0002] Existing fault location methods for transmission lines in power systems mainly include impedance method and traveling wave method, both of which have their own advantages and disadvantages in the process of use. [0003] Impedance method is usually used as an additional function of microcomputer protection and wave recording device. It has the characteristics of starting fixed value quantification and less investment. However, its ranging accuracy is greatly affected by factors such as transition resistance, distributed capacitance, and system operation mode. It meets the requirements of the power system for ranging accuracy....

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): G01R31/11G01R31/08G01R31/02
Inventor 李猷民车仁飞安沫霖李沐赵传刚张宗保
Owner STATE GRID SHANDONG ELECTRIC POWER
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