http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Investigation of 0.5 MJ superconducting energy storage system by acoustic emission method.
S.M.Miklyaev,S.A.Shevchenko,M.I.Surin 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
The rapid development of small-scale (1-10 MJ) Superconducting Magnetic Energy Storage Systems (SMES) can be explained by real perspective of practical implementation of these devices in electro power nets. However the serious problem of all high mechanically stressed superconducting coils - problem of training and degradation (decreasing) of operating current still exists. Moreover for SMES systems this problem is more dangerous because of pulsed origin of mechanical stresses - one of the major sources of local heat disturbances in superconducting coils. We investigated acoustic emission (AE) phenomenon on model and 0.5 MJ SMES coils taking into account close correlation of AE and local heat disturbances.<br/> Two - coils 0.5 MJ SMES system was developed, manufactured and tested at Russian Research Center ?Kurchatov Institute? in the frames of cooperation with Korean Electrical Engineering Company (KEPCO) [1]. The two-coil SMES operates with the stored energy transmitted between coils in the course of a single cycle with 2 seconds energy transfer time. Maximum operating current 1.55 kA corresponds to 0.5 MJ in each coil. The Nb-Ti-based conductor was designed and used for SMES manufacturing. It represents transposed cable made of Nb-Ti strands in copper matrix, several cooper strands and several stainless steel strands'. The coils are wound onto fiberglass cylindrical bobbins.<br/> To make AE event information more useful a real time instrumentation system was used. Two main measured and computer processed AE parameters were considered: the energy of AE events (E) and the accumulated energy of AE events (E_∑). Influence of current value in 0.5 MJ coils on E and E_∑ was studied. The sensors were installed onto the bobbin and the external surface of magnets. Three levels of initial current were examined: 600 A, 1000 A, 1450 A. An extraordinary strong dependence of the current level on E and E_∑ was observed.<br/> The specific features of AE from model coils, operated in sinusoidal vibration current changing mode were investigated. Three current frequency modes were examined: 0.012 H_z, 0.03 H_z and 0.12 H_z In all modes maximum amplitude 1200 A was realized.<br/> Maximum E corresponds to the maximum current and practically no unload/reload Kaiser effect was observed.<br/> On model SMES the correlation of E and E_∑ with vibration current frequency was discovered.
HTS high gradient magnetic separator prototype
D. N. Diev,V. M. Lepehin,M. N. Makarenko,A. V. Polyakov,V. I. Shcherbakov,D. I. Shutova,M. I. Surin,E. Ya. Tagunov 한국초전도.저온공학회 2018 한국초전도저온공학회논문지 Vol.20 No.4
A high gradient magnetic (HGM) separator prototype with the 2nd generation high temperature superconducting (2G HTS) magnetic system operated in sub-cooled nitrogen is presently under development at NRC “Kurchatov Institute” (Moscow, Russia). The main goal of the project is an attempt to shift away from the complicated liquid helium cryostats towards simple cryocooler-based nitrogen cryogenics as much more convenient for HGM separators industrial applications. Using of commercial HTS tapes allows to get a sufficient level of magnetic fields and extraction forces with low energy consumption. The expected operational parameters of the device are 1.2-1.5 T in the empty operational gap and up to 3 T on the ferromagnetic filters. In this paper we briefly describe the design of the HTS rotary separator prototype with the horizontally oriented rotor axis and propose different types of ferromagnetic filters intended for weakly magnetic ores enrichment.
HTS high gradient magnetic separator prototype
Diev, D.N.,Lepehin, V.M.,Makarenko, M.N.,Polyakov, A.V.,Shcherbakov, V.I.,Shutova, D.I.,Surin, M.I.,Tagunov, E. Ya. The Korean Society of Superconductivity and Cryoge 2018 한국초전도저온공학회논문지 Vol.20 No.4
A high gradient magnetic (HGM) separator prototype with the $2^{nd}$ generation high temperature superconducting (2G HTS) magnetic system operated in sub-cooled nitrogen is presently under development at NRC "Kurchatov Institute" (Moscow, Russia). The main goal of the project is an attempt to shift away from the complicated liquid helium cryostats towards simple cryocooler-based nitrogen cryogenics as much more convenient for HGM separators industrial applications. Using of commercial HTS tapes allows to get a sufficient level of magnetic fields and extraction forces with low energy consumption. The expected operational parameters of the device are 1.2-1.5 T in the empty operational gap and up to 3 T on the ferromagnetic filters. In this paper we briefly describe the design of the HTS rotary separator prototype with the horizontally oriented rotor axis and propose different types of ferromagnetic filters intended for weakly magnetic ores enrichment.
REBCO coil operation in gaseous helium and solid nitrogen
Diev, D.N.,Makarenko, M.N.,Naumov, A.V.,Polyakov, A.V.,Shcherbakov, V.I.,Shutova, D.I.,Surin, M.I. The Korea Institute of Applied Superconductivity a 2019 한국초전도저온공학회논문지 Vol.21 No.3
The paper gives the results of the experiments with a model two-section REBCO solenoid cooled by either gaseous helium (GHe) or sub-cooled/solid nitrogen (SN2) in (50-77) K temperature range. The major cooling source was a single-stage cryocooler Sumitomo CH-110 with the cooling power of 175 W and 130 W at 77 K and 50 K respectively. The coil itself was not directly conduction cooled. We compare the time taken by both coolants to obtain the temperature of the magnet of about 50 K and the homogeneity of the temperature distribution within the cryostat. Test results for the coil operation in solid nitrogen together with the comparison of its critical properties in SN2 and GHe are also presented.
REBCO coil operation in gaseous helium and solid nitrogen
D. N. Diev*,M. N. Makarenko,A. V. Naumov,A. V. Polyakov,V. I. Shcherbakov,D. I. Shutova,M. I. Surin 한국초전도.저온공학회 2019 한국초전도저온공학회논문지 Vol.21 No.3
The paper gives the results of the experiments with a model two-section REBCO solenoid cooled by either gaseous helium (GHe) or sub-cooled/solid nitrogen (SN2) in (50-77) K temperature range. The major cooling source was a single-stage cryocooler Sumitomo CH-110 with the cooling power of 175 W and 130 W at 77 K and 50 K respectively. The coil itself was not directly conduction cooled. We compare the time taken by both coolants to obtain the temperature of the magnet of about 50 K and the homogeneity of the temperature distribution within the cryostat. Test results for the coil operation in solid nitrogen together with the comparison of its critical properties in SN2 and GHe are also presented.