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Method and system for improving cable fault measurement precision

A measurement accuracy and cable technology, applied in the field of improving the measurement accuracy of cable faults, methods and systems, can solve problems such as large measurement errors, and achieve the effects of reducing measurement errors, reducing blind zone distance, and improving measurement accuracy

Active Publication Date: 2020-01-14
SHANDONG SENTER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the change of pulse wave velocity, this measurement method is prone to measurement errors, and the longer the cable, that is, the larger the measurement range, the greater the loss of high-frequency components in the pulse signal, which in turn leads to greater measurement errors

Method used

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  • Method and system for improving cable fault measurement precision
  • Method and system for improving cable fault measurement precision
  • Method and system for improving cable fault measurement precision

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The embodiment of the present application discloses an electronic device for improving the accuracy of cable fault measurement, such as figure 1 shown, including:

[0044] Cable interface 1, impedance matching module 2, analog signal amplification module 3, ADC signal acquisition module 4, signal control and processing module 5, FPGA control module 6 and pulse control module 7;

[0045] The impedance matching module 2, the analog signal amplification module 3, the ADC signal acquisition module 4, the signal control and processing module 5, the FPGA control module 6 and the pulse control module 7 are sequentially connected;

[0046] The FPGA control module 6 is connected with the ADC signal acquisition module 4;

[0047] The cable interface 1 is connected to the impedance matching module 2;

[0048] The cable interface 1 is used to connect the cable under test;

[0049] The pulse control module 7 is used to send a pulse signal with increasing width to each section of ...

Embodiment 2

[0058] The embodiment of the present application discloses a method for improving the accuracy of cable fault measurement, such as figure 2 As shown, the method includes:

[0059] S1: divide the tested cable into n sections to be tested according to the actual total length of the tested cable;

[0060] Specifically, the section length of each section to be tested in the cable under test is determined according to the preset number of sections divided into sections to be tested by the cable under test and the actual total length of the cable under test. Or according to the actual total length of the cable under test, starting from one end of the cable under test, take a section shorter than the actual total length of the cable under test as the section to be tested, if the fault location is determined in the section to be tested and fault type, then end all operations. If the fault location and / or fault type are not determined in the section to be tested, start from the above...

Embodiment 3

[0070] Based on the same idea of ​​a method for improving the accuracy of cable fault measurement provided in Embodiment 2, this embodiment also provides a system for improving the accuracy of cable fault measurement, such as image 3 As shown, the system includes:

[0071] A division unit, configured to divide the tested cable into n sections to be tested according to the actual total length of the tested cable;

[0072] The signal sending and collecting unit is used to send a pulse signal with increasing width to each section to be tested and collect the reflected pulse signal at the impedance change position in each section to be tested;

[0073] The determination unit is configured to determine the fault location and fault type in the cable according to the reflected pulse signal at the impedance change position in each section to be tested.

[0074] The division unit is specifically used for:

[0075] Determine the section length l of the i-th section to be tested in th...

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Abstract

The invention relates to a method and a system for improving cable fault measurement precision. The method comprises the steps of dividing a measured cable into n sections to be measured according toan actual total length of the measured cable; sending pulse signals with increasing widths to each section to be measured, and collecting reflected pulse signals at impedance change positions in eachsection to be measured; and determining a fault position and a fault type in the cable according to the reflected pulse signals at the impedance change positions in each section to be measured. In a technical scheme of the invention, the measured cable is divided into the n sections to be measured so that a blind area distance of measurement can be reduced, and measurement precision of a middle fault point is increased; and the pulse signals with the increasing widths are sent to each section to be measured so that measurement errors caused by the change of a transmission speed of the pulse signals with a fixed width can be reduced.

Description

technical field [0001] The invention relates to the field of time domain reflection measurement cable faults, in particular to a method and system for improving the measurement accuracy of cable faults. Background technique [0002] Cable is a general term for optical cables and cables. It is mainly used for the connection between power supply equipment and electrical equipment, and is responsible for multiple tasks such as equipment connection and power transmission. Compared with overhead transmission lines, cables have the advantages of small investment, reliable operation and convenient layout. With the gradual advancement of urbanization in my country, the application range of cables is becoming wider and wider. However, cables have complex construction techniques. Once a fault occurs, it will directly affect the power supply of the power grid and cause serious losses to people's production and life. Therefore, enterprises are paying more and more attention to the dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/11
CPCG01R31/083G01R31/11
Inventor 刘在平张艳鹏张阳唐坤
Owner SHANDONG SENTER ELECTRONICS
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