Application of time-frequency domain reflectometry based on multi-band signal for detection and localization of fault on cable

• Published in: 2014 14th International Conference on Control, Automation and Systems (ICCAS 2014) pp. 396 - 401
• Main Authors: Moon Kang Jung, Yong June Shin, Jin Bae Park
• Format: Conference Proceeding
• Language: English
• Published: Institute of Control, Robotics and Systems (ICROS) 01.10.2014
• Subjects: Attenuation; band pass filter; Delays; frequency division multiflexing; Moon; Power cables; time-frequency domain reflectometry; wave number
• ISSN: 2093-7121
• DOI: 10.1109/ICCAS.2014.6988029

This paper presents time-frequency domain reflectometry (TFDR)-fault detection method based on frequency division multiplexed (FDM) signal. The TFDR-method sends a reference signal into a cable and measures the reflected signals to detect a fault on cable. Therefore, the performance of TFDR-based detection method is determined by characteristic of the reference signal. Especially, choosing frequency band of the reference signal is main concern of TFDR-method since it suffers from trade-off relation between spatial resolution and attenuation of the reference signal. If one increases frequency band of reference signal to improve spatial resolution, the signal suffers from attenuation in cable. That is trade-off relation of signal. Thus, to optimize this trade-off issue, we propose multi-band signal based on FDM. This approach is able to synthesize two signals which have different frequency band; one is designed for the spatial resolution, and the other is used for attenuation. Hence, in TFDR-method, the proposed reference signal can solve the optimization problem and gives more accurate fault location without the distance limitation caused by attenuation and spatial resolution. Simulation results show that the proposed method localizes the accurate fault location.