High-accuracy online cable fault detecting/locating device

A cable fault and locating device technology, applied in the direction of the fault location, etc., can solve the problems of normal operation of the system, cable damage, unsafety, etc., achieve ideal autocorrelation characteristics and cross-correlation characteristics, improve the accuracy rate, and increase the number of effects

Active Publication Date: 2015-01-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This needs to disconnect the original connection of the cable and change the interface terminal of the cable system, which will undoubtedly have a great impact on the normal operation of the system
Moreover, as the number of times increases, it will cause certain damage to the cable, and it will also bring some unsafe factors when performing fault diagnosis on high-voltage power cables.

Method used

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  • High-accuracy online cable fault detecting/locating device
  • High-accuracy online cable fault detecting/locating device
  • High-accuracy online cable fault detecting/locating device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The minimum FPGA system constructed mainly includes an FPGA configuration circuit, a clock circuit, a reset circuit, and an external memory chip circuit. This embodiment adopts the AS configuration mode and the JTAG configuration mode. The connection diagram is as follows Figure 4 shown.

[0081] Because AD and DA need to work at a conversion rate above 500Msps, their clock needs at least 500MHz. In this embodiment, the CDCE62002RHBR clock generator of TI Company is selected to output two differential clocks independently to provide clock sources for AD and DA. The frequency range of the chip output clock is 10.94MHz ~ 1.175GHz, which can meet the high-frequency clock requirements required by AD and DA.

[0082] In the present invention, the control of the DA chip is realized by configuring the level of the corresponding control pin, the input data adopts an unsigned number, the interpolation function and the FIFO function are not enabled, and the output analog curre...

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PUM

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Abstract

The invention discloses a high-position accuracy online cable fault detecting/locating device based on an SSTDR method. The device comprises an FPGA module, a DA conversion module, an AD conversion module, a conditioning circuit, a channel selection module and a plurality of non-contact coupling channels; the device has the advantages that the center frequency of a detection signal is increased so that the location error can be reduced, and as a chaotic sequence is taken as spreading codes, the number of detection sequences is greatly increased and the fault detection on complex multiple cables can be realized; an inductive non-contact coupling device is adopted to realize the directional coupling of the high-frequency detection signals without affecting the normal work of the system.

Description

technical field [0001] The invention relates to an on-line cable fault detection and positioning device with high positioning accuracy, which belongs to the field of cable fault detection. Background technique [0002] At present, the country's modernization is advancing rapidly, and industrialization and informatization are deepening. A large number of power distribution networks and electrical and electronic systems play a pivotal role in all walks of life. The wires and cables used are also densely distributed and increasingly complex. Due to the frequent work in harsh environments such as high temperature, vibration, friction, etc., the wires and cables buried deep in the structure and the bottom layer are prone to cracks and wear with age, and are gradually aging and damaged. Accidents caused by cable failures in all walks of life are increasing, causing huge losses to the national economy, and burying a great hidden danger to personal and property safety. [0003] In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 王莉洪博
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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