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The problem of low accuracy and low efficiency of off-line detecting on thermal test low-frequency cable faults could be solved by designing a cable fault detection system, based on FPGA export M sequence code(Linear feedback shift register sequence) as pulse signal source. This article has discussed the design principle of SSTDR (Spread spectrum time-domain reflectometry) reflection method, and hardware structure Figure. Testing data show that, experimental platform established by this detection system could adapt to faulty measurement of thermal test lowfrequency cable with different lengths and could meet on-line monitoring requirements. INTRODUCTION It is necessary to conduct fault monitoring timely and accurately when implementing and using low-frequency low-pressure cables and power cables. Otherwise, it will result in severe loss of manpower, materials and time, and bring extremely negative impact on economy and society, such as the “problem cable” in Xi’an metro [1]. Thermal test low-frequency cable fault types involved in this article can be divided into open circuit fault, low-resistance fault and high-resistance fault. Factors causing thermal test low-frequency cable faults are because of damages of various physical outer forces, high-low thermal impact and improper manual operation [2], mainly including: (1) mechanical damage and unstandardized installation; (2) operation at full load under high-low temperature impact in thermal test process will accelerate aging; (3) electrochemical corrosion in humid and acid-bases environment. Traditional offline detection method has some defects as below: it will cause extra loss of working time when system is cut off in low efficiency. On the other hand, voltaic arc fault of cable will not occur again when cable is off-work. In that case, the fault is hard to be detected by using traditional offline detection method.  Dongliang Wu, ALWAYSLQF@163.com, Beijing, 100094, Beijing Institute of Spacecraft Environment Engineering

Design on Fault Online Detection Device of Thermal Test Low-Frequency Cable Based on M Sequence Correlation Algorithm