Research on Cable Fault Online Detecting and Locating Device

Abstract

As an important part of aircraft power supply system, cable is particularly important to realize cable fault online diagnosis. The cable reliability can be improved by using the spread spectrum time domain reflectometry(SSTDR). Based on FPGA technology a cable fault online detecting and locating device with the 500 MHz board level rate is designed and verified by experiment. Results show that the instrument can realize the online detection and location of the open circuit, short circuit and intermittent arc of cables, and has the advantages of high positioning accuracy and good real-time performance. Using this device to monitor the health state of the cable fault on-line and realize the detection of the intermittent fault which is difficult to reappear. It can improve the efficiency of ground operation and maintenance, save a lot of manpower and material resources and has higher engineering value.

Keywords

• aircraft cable fault
• cable fault detection and location
• spread spectrum time domain reflectometry
• transmission line theory