Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Cable water tree branch fault positioning method based on impedance spectrum technology

A technology of fault location and impedance spectroscopy, which is applied in the direction of fault location and fault detection according to conductor type, can solve problems such as damage, high cost, and outage of large electrical systems, and achieve large bandwidth, large time width, and distance and distance The effect of conflicting resolutions

Active Publication Date: 2021-08-13
国网江苏省电力有限公司淮安供电分公司 +1
View PDF8 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design life of the cable is generally 20 to 30 years, and the cable in actual operation often induces permanent failure due to local latent defects such as local aging or damage of the insulation. Once a cable failure occurs, it will cause the shutdown or even loss of control of the large electrical system. Cause serious economic loss and social impact
[0003] After the cable is put into operation, the insulation will be affected by factors such as electricity, heat, machinery, and moisture, and will age, which will affect the operational reliability and service life of the cable.
More than 40 years of operation and research have shown that water treeing is the main factor leading to shortened insulation life of cross-linked polyethylene (XLPE) cables
The detection of local defects of power cables and water branches is a big problem. Oscillatory wave testing technology can only detect electric branches. Although the ultra-low frequency dielectric loss test can detect the existence of water branches of cables, it cannot locate water branches. The interception method for positioning is not only costly but also time-consuming, and it is difficult to find hidden dangers of processing equipment defects in time in the application of engineering technology

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
  • Cable water tree branch fault positioning method based on impedance spectrum technology
  • Cable water tree branch fault positioning method based on impedance spectrum technology
  • Cable water tree branch fault positioning method based on impedance spectrum technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0054]The present invention is illustrated by taking the multi-core cable structure in which each core wire does not contain a conductor shielding layer as an example. figure 1 , for cables with multi-core structure, in order to study the running state of each wire, two core wires are taken to form a transmission loop, and its transmission characteristics are determined by the distribution parameters between the two core wires. Although the structures of coaxial cables and multi-core cables are quite different, they can be equivalent to distributed parameters when studying their transmission characteristics.

[0055] A cable water branch fault location method based on impedance spectrum technol...

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 the technical field of fault positioning, and discloses a cable water branch fault positioning method based on an impedance spectroscopy technology. The method comprises the steps of deriving a cable distribution parameter frequency change effect broadband impedance calculation model based on a transmission line theory; calculating cable line impedance by using the broadband impedance calculation model, and forming a cable broadband impedance spectrum; utilizing an algorithm to optimize a difference value function of an impedance spectrum calculation value and a measurement value to obtain defect section characteristic parameters; utilizing a linear resonance analysis method to analyze the defect section characteristic parameters so as to determine characteristic information of a defect section cable; analyzing the characteristic information of the defect section cable to diagnose the running state of the cable, detecting the change condition of the running state of the cable, and determining the water branch fault position of the cable. Compared with the prior art, the impedance calculation model is deduced through the transmission line theory, local defect characteristic parameters are extracted from impedance spectrum data, and accurate positioning and state evaluation of cable aging, damage and other defects are achieved.

Description

technical field [0001] The invention relates to the technical field of fault location, in particular to a cable water branch fault location method based on impedance spectrum technology. Background technique [0002] With the application of power cables in power systems more and more widely, the insulation state of power cables directly affects the safe and reliable operation of power systems. The power cable is the link and bridge of the power supply network, and its status monitoring and fault diagnosis are of great significance to ensure the reliability of power supply. However, because the power system is huge, the execution cycle of the cable is relatively long, and the insulation aging is slow, so the monitoring and diagnosis of the cable have not attracted enough attention. In recent years, with the continuous increase of the capacity of the fleet, cables play an extremely important role in the transmission of electric energy and communication signals in large electr...

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): G01R31/08
CPCG01R31/083
Inventor 周宝昇吴绍武王德全卢旻郝晓强李勇群王亮
Owner 国网江苏省电力有限公司淮安供电分公司
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
Eureka Blog
Learn More
PatSnap group products