Plane cable fault locator based on time domain reflection

Abstract

A plane cable fault locator based on time domain reflection includes a high speed pulse generating and transmitting circuit, a high speed pulse acquisition and treatment circuit, an impedance matching circuit, a signal storing and treating system, a communication interface, a power supply system, an information display system, an external connection computer system and an information input system. The plane cable fault locator based on time domain reflection adopts a low pressure high speed pulse reflection method to diagnose the types of plane cable short circuit and open circuit and other faults through observing fault point reflection pulse waveform according to a time domain reflection principle, and subsequently calibrates the position of a fault point by measuring the time difference of transmitted pulse and the reflected pulse of the fault point. As the rising edge time of the pulse transmitted by the locator is short and reaches nanosecond level, the locating precision is high. In addition, the locator can accurately calibrate the plane cable fault position so as to avoid taking a plurality of clamping plates apart when looking for faults in plane cable maintenance, thus improving the maintenance efficiency of planes and ensuring the flying safety of planes.

Description

technical field [0001] The invention relates to an aircraft cable fault locator, in particular to a high-speed low-voltage pulse reflection aircraft cable fault locator based on a time domain reflection method. Background technique [0002] With the rapid development of my country's national economy, the civil aviation transportation industry has developed rapidly, the fleet size has continued to expand, and the service time of in-service aircraft has also continued to increase. Therefore, the requirements for corresponding testing and inspection methods are also increasing. Various testing instruments Both require the ability to quickly and accurately complete the corresponding test tasks. Aircraft cables require regular testing to diagnose and locate faults. Since the aircraft cables are widely distributed in the aircraft interlayer and are connected to various surrounding equipment, high-voltage discharge is not allowed to be performed on the fault location first, so as t...

AI Technical Summary

Problems solved by technology

At present, most maintenance departments in my country still rely on general-purpose multimeters for testing, but there are many problems in multimeter testing, mainly in the following aspects: limited by the layout of aircraft cables, the contact resistance of the measured cables cannot meet the test requirements, so it is difficult to detect intact paths and The difference in contact resistance

Although a small number of large-scale maintenance bases use imported time domain reflectometers as special detection equipment for aircraft cable fault location, due to the limitations of this instrument, it is mainly effective for radio frequency coaxial cables, and it is expensive and the maintenance is not timely. not widely used

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