Abstract
This paper develops and applies an inductive directional coupling technology based on spread spectrum time domain reflectometry for non-intrusive power cable fault diagnosis. Different from existing capacitive coupling approaches with large signal attenuation, an inductive coupling approach with a capacitive trapper is proposed to reduce signal attenuation, restrict transmitting the detection signal to power source, and eliminate the effect of the power source impedance mismatch. Moreover, a novel structure with two parallel couplers is developed to enhance the effect of capacitive trapper with small capacitance. The development, design, analysis, and implementation of the proposed approach are discussed in details. A series of simulations and experiments on cables with different fault modes at different locations are conducted, along with comparison with existing capacitive coupling approaches, to verify and demonstrate the effectiveness of the proposed method.
Highlights
Rapid development of complicated large-scale systems, such as aircraft, space stations, nuclear and renewable power systems, brings more and more wires and cables in electrical systems to transmit power and control signals
According to the incident signals, reflectometry methods are divided into Time Domain Reflectometry (TDR) [3,4,5], Frequency Domain Reflectometry (FDR) [6], Sequence Time Domain Reflectometry (STDR) [7,8], Spread Spectrum Time Domain Reflectometry (SSTDR) [7,8], Joint Time-frequency
Noise Domain Reflectometry (NDR), STDR, SSTDR, and Joint Time-frequencyDomain Reflectometry (JTFDR) [11,12,13,14,15] are capable for online diagnosis
Summary
Rapid development of complicated large-scale systems, such as aircraft, space stations, nuclear and renewable power systems, brings more and more wires and cables in electrical systems to transmit power and control signals. SSTDR has advantages over others in high performance of anti-interference, which means no influence on the normal working of the system These reflectometry methods show successes in cable fault diagnosis, they are contact techniques that require a detection device connected to the test cable for sending an incident signal and receiving the reflected signal. The contributions include: (1) Propose a non-intrusive inductive coupling method that integrates with SSTDR for cable diagnosis; (2) Propose a capacitive trapper in inductive coupling to restrict the detection signal from transmitting to power source and to eliminate the effect of the power source impedance mismatch; (3) Conduct thorough simulations and experimental verifications with comparison to existing approaches to verify the proposed method.
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