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

Method for measuring power cable equipment live or not

A technology of power cables and detection methods, applied in the field of measurement, can solve the problems of inability to judge, cannot be implemented, and cannot adapt to whether there is electricity or not, and achieves the effects of convenient detection and use, accurate judgment results, and elimination of misjudgment.

Inactive Publication Date: 2006-05-24
张延辉
View PDF2 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, this method is only suitable for judging whether the physical distance between three-phase conductors such as high-voltage transmission lines or high-voltage busbars (commonly known as busbars or copper bars) in substations is large. For cables, due to their special structure (the physical spacing of the three-phase core wires is very small), the test results can only be similar to the aforementioned method of listening to current and sound, and it is still impossible to implement
[0014] At the same time, since the induced current in the cable and equipment is also a 50HZ / 60HZ sine (or cosine) wave AC signal and its harmonic signal, its high-frequency components are rich, so the above method cannot distinguish the induction signal existing on the cable equipment. and common impedance signal, it cannot be judged whether the detected signal is generated by the magnetic field of the cable itself or by the magnetic field of the induced electricity, so this technical solution cannot be adapted to the concentrated laying of multiple cables (such as cable ditch or cable tray) to determine whether one of the cables has electricity

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
  • Method for measuring power cable equipment live or not
  • Method for measuring power cable equipment live or not
  • Method for measuring power cable equipment live or not

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The measured phase angle of the three-phase magnetic field signals of a certain cable in the cable trench is 120°, the amplitude of the environmental background magnetic field signal is 5%, and the amplitude of the three-phase magnetic field signals of the cable is 45% to 55%. image 3 Therefore, it is determined that it is a live running cable.

[0054] Here, the amplitude of the magnetic field signal is a relative value after testing and setting a certain induced voltage range as a standard (the same below).

[0055] The reason for the above-mentioned environmental background magnetic field signal: In the cable trench, there will be multiple cables, which will generate a magnetic field. At this time, the entire area will have a magnetic field generated by 50 / 60Hz current. At this time, the entire cable trench area space There will be a magnetic field, so it is called the environmental background magnetic field signal.

[0056] In the actual test process, it is necess...

Embodiment 2

[0060] It is measured that the phase angle of the three-phase magnetic field signals of a certain cable on the cable tray is 120°, the amplitude of the environmental background magnetic field signal is 20%, and the amplitude of the three-phase magnetic field signals of the cable is 18% to 22%. image 3 Therefore, it is determined that it is a hot standby cable.

[0061] Use Taiwan Good Instair MDS series digital storage oscilloscope or GOS series analog oscilloscope, and the magnetic induction sensor can be connected to its signal input terminal.

[0062] All the other are with embodiment 1.

Embodiment 3

[0064] It is measured that the phase angle of the three-phase magnetic field signals of a certain cable on the cable bridge is 0°, the amplitude of the environmental background magnetic field signal is 15%, the amplitude of the three-phase magnetic field signal of the cable is around 15%, and the magnetic field signal is mainly high frequency, the amplitude has no obvious fluctuation, according to figure 2 Therefore, it is determined that it is a non-live cable.

[0065] Beijing Modern Electronics Co., Ltd. TDS30XXX series digital storage oscilloscope is used, and the magnetic induction sensor is connected to its signal input terminal.

[0066] All the other are with embodiment 1.

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

Using inductive probe collects signal of magnetic field generated by current of each phase in cable so as to form analog signal for representing consecutive change situation of magnetic field of each phase in power cable to be tested. A / D converted analog signal is stored. The signal is sent to subsequent processing, calculating, image displaying or drawing device so as to obtain consecutive curve of variation. Phase, amplitude of the said curve is compared with phase, amplitude of signal source in line frequency as well as of magnetic field of environmental setting. If phase relation of the curve is accorded with phase relation of signal source in line frequency, and amplitude of the curve is higher than signal amplitude of magnetic field of environmental setting, then the cable to be tested is determined in electrified state, using different phase relation, the invention distinguishes operating cable, warm standby cable and disused cable, not parallel in operation cable.

Description

technical field [0001] The invention belongs to the field of measurement, in particular to a detection method for judging whether a cable is electrified by measuring the correlation characteristics of the magnetic field signal of the cable. Background technique [0002] The cable equipment used or used for power transmission or distribution is called power cable equipment (referred to as cable, the same below). [0003] With the progress of society and the development of industrial and agricultural production, especially the rapid development of urban construction in the past 20 years, the consumption of cables has increased dramatically. Many cities have stipulated that overhead lines are not allowed to be used in urban areas, and large-scale development and implementation of "overhead lines into the ground" projects (that is, transmission lines or power networks composed of overhead lines and underground transmission lines composed of buried cables) or power network inste...

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): G01R19/155G01R29/08G01R31/08
Inventor 张延辉
Owner 张延辉
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