Device for online detecting and locating cable fault based on SOPC (System On Programmable Chip) technology

Abstract

The invention discloses a device for online detecting and locating cable fault based on SOPC (System On Programmable Chip) technology, which comprises an FPGA (Field Programmable Gate Array) module with a NIOS II soft core, a high-speed DA module, a signal conditioning module, a separating coupling module and a high-speed AD module, wherein the FPGA (Field Programmable Gate Array) module generates detecting signals for detecting cable faults; the detecting signals are converted into analog signals by the high-speed DA module; then the analog signals are converted into detecting signals with proper amplitude by the signal conditioning module; the detecting signals are coupled into the detected cable in working state by the separating coupling module; meanwhile, the feedback signals from the cable fault points are received from the separating coupling module; the feedback signals are converted into digital signals by the high-speed AD module and the digital signals are sent to the FPGA (Field Programmable Gate Array) module with NIOS II soft core; and the fault type and fault distance information of the tested cable is acquired by the digital signals through relative calculation and fault detecting and locating algorithm. The cable fault can be detected and located in real time by the device. In addition, the device has advantages of accurate test, high test precision, strong interference resistance, high integration level and the like.

Description

technical field [0001] The invention belongs to the technical field of electric engineering, and in particular relates to an on-line detection and positioning device for cable faults. Background technique [0002] The development of electrification and information society makes the application range of cables as energy and information transmission medium more and more extensive. Aerospace, public transportation, and home life are all inseparable from cables to provide power transmission and signal transmission. In these application fields, cables are often buried deep underground, in walls, and in the structures of automobiles and aerospace vehicles, unlike traditional power transmission and distribution lines that use a large number of overhead lines, and the wires are exposed. This installation method gives The detection and maintenance of cable faults has brought a lot of trouble. [0003] Cables have been working in complex environments such as vibration, radiation, col...

AI Technical Summary

Problems solved by technology

After 2000, instruments using the bridge method test principle continued to be used and developed. This method has a long history, simple circuit implementation, and easy control of cost and volume. However, this method must be measured at both ends of the cable. Simultaneous operation, high requirements for operators and troublesome operation, the measurement accuracy is greatly affected by human factors

[0006] The measurement principle of using time domain reflection technology for cable fault location has matured after more than ten years of development. The determination of distance and fault type is basically not affected by human factors. However, since the incident detection signal uses a single DC voltage pulse, this method is susceptible to interference and has poor measurement accuracy, and can only be applied to offline cable faults. In detection and judgment

[0007] To sum up, the current cable fault detection and location methods can only detect and locate cable faults off-line, and cannot perform well on non-reproducible intermittent faults such as short circuits, open circuits, and arcs on cables. detection and positioning, which brings great hidden dangers to the safe operation of cables

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