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

Using Lumped Parameters to Realize the Single-End Distance Measurement Method of Phase-to-Phase Faults

A single-ended ranging technology for phase-to-phase faults, applied in the direction of the fault location, etc., can solve the problems that the ranging results of the impedance method deviate from the real fault distance, the sampling rate is very high, and the ranging accuracy is affected, and the ranging speed is fast. The principle of ranging is simple and the effect of real-time performance is strong

Active Publication Date: 2015-12-23
STATE GRID CORP OF CHINA +2
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traveling wave method utilizes the transmission properties of fault transient traveling waves to perform single-ended fault location. It has high precision and is not affected by the operation mode and excessive resistance. However, it requires a high sampling rate, requires a special wave recording device, and has high application costs.
The impedance method uses the voltage and current after the fault to calculate the fault loop impedance, and performs single-ended fault distance measurement according to the characteristic that the line length is proportional to the impedance. It is simple and reliable, but the distance measurement accuracy is seriously affected by factors such as transition resistance and load current, especially When the transition resistance is large, the ranging result of the impedance method will seriously deviate from the real fault distance, and even the ranging failure will occur.

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
  • Using Lumped Parameters to Realize the Single-End Distance Measurement Method of Phase-to-Phase Faults
  • Using Lumped Parameters to Realize the Single-End Distance Measurement Method of Phase-to-Phase Faults
  • Using Lumped Parameters to Realize the Single-End Distance Measurement Method of Phase-to-Phase Faults

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0015] figure 1 It is a schematic diagram of the line transmission system applying the present invention. figure 1 Among them, PT is a voltage transformer, and CT is a current transformer. The protection device includes a data acquisition system and a data processing system. The data acquisition system of the protection device samples the voltage of the voltage transformer PT and the current waveform of the current transformer CT at the installation place of the transmission line protection to obtain the instantaneous values ​​of voltage and current, and pass Calculation of Fault Phase-to-Phase Voltage at Transmission Line Protection Installation by Fourier Algorithm Negative sequence voltage between fault phases Fault phase current and negative sequence current between fault phases Among them, φφ=AB, BC, CA phase.

[0016] The data acq...

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 method utilizing lumped parameters to realize line interphase fault single-terminal location. According to the method, the lumped parameters are adopted to describe the physical properties of voltage and current transmission of a transmission line; the fault interphase negative sequence current phase angle of a relay location of the transmission line is adopted to calculate the voltage phase angle of an interphase short circuit fault point; and the fault location is calculated according to the linear relationship between the voltage drop from the relay location of the transmission line to the interphase short circuit fault point and the fault location. According to the invention, as the fault location is calculated according to the linear relationship between the voltage drop from the relay location of the transmission line to the interphase short circuit fault point and the fault location, the influences of the transitional resistance and the load current to the location precision are avoided, the location precision is high, the location principle is simple and the practicability is strong. The method can directly calculate the fault distance without adopting the search algorithm, and is high in location speed and strong in real-time performance.

Description

technical field [0001] The invention relates to the technical field of single-end fault distance measurement in electric power systems, in particular to a method for realizing single-end fault distance measurement between line phases by using lumped parameters. Background technique [0002] According to the division of electrical quantity sources, fault location methods are mainly divided into double-ended location methods and single-ended location methods. The double-terminal ranging method uses the electrical quantities at both ends of the transmission line to locate faults. It needs to obtain the electrical quantities at the opposite end through the data transmission channel, which is highly dependent on the data transmission channel. The single-ended ranging method only uses the electrical quantity at one end of the transmission line for fault location, does not require communication and data synchronization equipment, has low operating costs and stable algorithms, and h...

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
Inventor 林富洪
Owner STATE GRID CORP OF CHINA
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