Remote low-voltage cable sequencing device and remote low-voltage cable sequencing method
A low-voltage cable and long-distance technology, which is applied in the field of long-distance low-voltage cable sequencing devices, can solve problems such as poor anti-interference ability, measurement failure, and short transmission distance, and achieve long transmission distance, simplified external circuit connection, and small size.
Inactive Publication Date: 2012-03-14
HOHAI UNIV CHANGZHOU
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Problems solved by technology
The publication number is CN93213630.3, and the patent titled "cable alignment device" uses digital circuits to generate scanning pulse signals and electronic switch arrays to realize cable alignment. It uses unmodulated voltage or current signals for measurement. The defect is that when the cable distance Long time and severe signal loss will lead to measurement failure
The publication number is CN200810136691.2, and the title is "Multi-core cable sequencing method and device based on frequency modulation digital coding". The patent uses digital frequency modulation method to realize signal transmission. The disadvantage is that a reference cable needs to be selected, and only one pair of cables can be measured each time. , and the transmission distance is short, the anti-interference ability is poor
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[0015] Such as figure 1 As shown, the sequencing device 1 is equipped with a receiving device and a transmitting device, and the sequencing device 1 is externally connected to the cable connection clip 2 of the receiving device and the transmitting device. indicator light6. An FPGA core module 4 is also set inside the sequencing device 1, and the connecting clip body 2, the liquid crystal display 3, and the function switching button 5 are respectively connected to the FPGA core module 4, and the sequencing device 1 can have a transmitter function through the function switching button 5 or the receiver function, respectively connect the connecting clamp body 2 of the transmitter function or the receiver function to both ends of the cable to be tested. At this time, the liquid crystal display 3 of the receiving device displays the corresponding line sequence pair.
[0016] Such as figure 2 , the FPGA core module 4 includes a function control module 7, and the function control...
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The invention discloses a remote low-voltage cable sequencing device and a remote low-voltage cable sequencing method. The sequencing device is provided with a receiving device and a transmitting device, wherein the inside of the sequencing device is provided with an FPGA core module which is respectively connected with a connecting clamp, a liquid crystal display and a function switch key. The sequencing method comprises the following steps: transmitting an OFDM modulating signal which carries line sequence information and is generated in a transmitting mode to a cable to be tested; receiving the OFDM modulating signal, containing line sequence information, on the cable to the tested in receiving mode; and obtaining correct line sequence pair information after modulating and decoding. The remote low-voltage cable sequencing device integrates the receiving device and the transmitting device without any reference point, and has simple hardware connection and very convenient use. On thebasis of an PFGA chip design, the remote low-voltage cable sequencing device adopts an OFDM modulation / demodulation mode to transmit and identify the digital line sequence signal, has long transmission distance and greatly simplified external circuit connection, removes a plurality of external signal conditioning modules in the prior art so as to improve the flexibility of the device, has convenient expansion, and can simultaneously test a 150-core cable at most.
Description
technical field [0001] The invention relates to a low-voltage cable sequencing technology, in particular to a long-distance low-voltage cable sequencing device. Background technique [0002] At present, cable is an important transmission medium of informatization, and its application has penetrated into various fields. During the cable laying process, how to identify the intricate and complex cables at both ends of the long-distance cable laying has become a difficult problem in construction. Although multi-core cables can be distinguished by color codes, it is still difficult to effectively distinguish if there is more than one multi-core cable at the node, and it is even more difficult when the cable fails due to factors such as the surrounding environment, external force, rodent damage, corrosion and aging. Difficult to distinguish effectively. How to solve the intricate pairing and positioning of the wire sequences at both ends of multiple cables during the maintenance...
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IPC IPC(8): G01R31/02G01R29/18
Inventor 梁瑞宇奚吉张卓张学武丁燕琼段敦勤顾灏钱萧诚孙浩顾丽萍
Owner HOHAI UNIV CHANGZHOU