Abstract
In this paper, a new method is presented for sensitive quench detection in high-temperature superconductor (HTS) rotating machinery. The normal zone propagation velocity of an HTS is about 1000 times slower than that of a low-temperature superconductor. Therefore, the propagation of normal zone resistance, which occurs when the HTS transits from the superconducting state to the normal state, is also slower. Thus, it is difficult to detect the abnormal signals by voltage measurement using voltage taps. Moreover, the monitoring signal includes noise generated by interaction between the HTS rotating machinery and the industrial environment. Therefore, when quenching occurs in the HTS rotating machinery, a thermal runaway occurs in the hot spot. Furthermore, the magnetic energy stored in the HTS coil can damage the machinery. For these reasons, a new method is proposed for sensitive quench detection that reduces the noise generated from the power supply and from the HTS rotating machinery, using both an RLC resonance circuit and fast Fourier transform analysis.
Highlights
Many research groups have studied quench detection methods for low-temperature superconductor (LTS) systems using voltage taps to measure abnormal voltage signals
Electromagnetic force (EMF) and noise signals were applied to the input source of the rotor coil
We proposed a new quench detection method for high-temperature superconductor (HTS) rotating machinery
Summary
Many research groups have studied quench detection methods for low-temperature superconductor (LTS) systems using voltage taps to measure abnormal voltage signals. Thermal runaway can occur in a hot spot and damage the HTS coil due to stored magnetic energy before the resistance generated in the normal zone can be measured. For these reasons, various quench detection methods that do not use a traditional voltage tap have been studied [1,2,3,4,5]. Ravaioli et al proposed a quench detection method based on the change in stray capacitance between magnet elements when quenching occurred [1]. A universal quench detection technique was proposed by Nanato et al with active
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