지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 1998.10
- 수록면
- 961 - 965 (5page)
이용수
초록· 키워드
오류제보하기
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.
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.
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.
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.
Maximum E corresponds to the maximum current and practically no unload/reload Kaiser effect was observed.
On model SMES the correlation of E and E_∑ with vibration current frequency was discovered.
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.
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.
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.
Maximum E corresponds to the maximum current and practically no unload/reload Kaiser effect was observed.
On model SMES the correlation of E and E_∑ with vibration current frequency was discovered.
목차
ABSTRACT
INTRODUCTION
1.Acoustic emission data processing.
2.Monitoring of model coil.
3.Monitoring of 0.5 MJ coils.
Conclusions
Acknowledgment
References
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