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

Power distribution network fault distance measurement method based on traveling wave signals generated during closing of circuit breaker

A technology of distribution network fault and ranging method, applied in fault location, fault detection by conductor type, fault detection by pulse reflection method, etc., can solve problems such as large ranging error and weak traveling wave signal.

Pending Publication Date: 2021-05-11
STATE GRID LIAONING ELECTRIC POWER RES INST +1
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A common problem with the fault signal ranging method is that if a fault occurs when the voltage is close to the zero-crossing point, the traveling wave signal generated by the fault will be weak, which will easily cause a large ranging error

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
  • Power distribution network fault distance measurement method based on traveling wave signals generated during closing of circuit breaker
  • Power distribution network fault distance measurement method based on traveling wave signals generated during closing of circuit breaker
  • Power distribution network fault distance measurement method based on traveling wave signals generated during closing of circuit breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The present invention will be further described in detail through the accompanying drawings and specific embodiments below.

[0021] When a fault occurs, the transmission wave process of its transient voltage traveling wave can be expressed by a second-order partial differential equation:

[0022]

[0023] In the formula, U is the column vector of the voltage of n wires to ground, L and C are the inductance and capacitance parameter matrices per unit length on the line, and the coupling phenomenon of the line causes L and C to be n-order full arrays. When analyzing the traveling wave transmission process, it is necessary to adopt an appropriate matrix transformation to convert LC into a diagonal matrix. Taking the voltage traveling wave as an example, the Karenbauer transformation matrix S is used to perform similar transformation, and we get

[0024] S -1 LCS = Λ u (2)

[0025] where Λ u is the modulus diagonal matrix of LC after matrix transformation. Substi...

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 power distribution network fault distance measurement method based on traveling wave signals generated during closing of a circuit breaker. The power distribution network fault distance measurement method comprises the steps of: analyzing the transmission characteristics of the traveling wave signals generated during closing power transmission after the circuit breaker is disconnected when a single-phase grounding fault occurs in a power distribution network, finding that traveling wave disturbance signals generated at the closing moment of the circuit breaker can serve as injection signals, and estimating the position of a fault point by using a traveling wave distance measurement method. The traveling wave signals have obvious characteristics and have relatively high accuracy when being used as measurement signals of a single-ended method. Meanwhile, the method does not need the investment of synchronous time synchronization equipment, and the distance measurement is carried out in the open-end operation of the circuit breaker when a conventional line fault occurs, and is not influenced by a neutral point grounding mode. The fault positioning problem of the power distribution network can be effectively solved, and the influence of transition resistance is small.

Description

technical field [0001] The invention belongs to the technical field of power grid fault detection, and in particular relates to a distribution network fault ranging method based on a circuit breaker closing and generating a traveling wave signal. Background technique [0002] As the main component of my country's power system, the distribution network undertakes the important task of transmitting and distributing electric energy. It is a network that is in close contact with users in the transmission link. The normal operation and development of various industries in our country are closely related to their safe and stable operation. Therefore, fast fault detection and troubleshooting of distribution network is particularly important. Most of the short-circuit faults in the distribution network are single-phase ground faults. However, in actual engineering, the distribution network has a complex operating environment due to factors such as the complex network structure of fe...

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): G01R31/11G01R31/08
CPCG01R31/11G01R31/086
Inventor 史可鉴陈刚吴建军王刚崔征朱义东张新宇马宁王志刚代子阔王阳聂宇田野张彬李斌李冠华赵丹徐伟力刘文祥
Owner STATE GRID LIAONING ELECTRIC POWER RES INST
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